CN103951061B - A kind of refinery sewage in-situ upgrading qualified discharge treatment process - Google Patents
A kind of refinery sewage in-situ upgrading qualified discharge treatment process Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The present invention relates to outside the upgrading of a kind of refinery sewage in-situ and arrange standard processing method, particularly relate to a kind of the upgrading processing technique and the implementation method that have adopted activated sludge process and acidication-Activated Sludge Process process refinery sewage.Method of the present invention utilizes existing refinery sewage treatment structure, by carrying out microbial film acidication, carry out loading specific stereo hollow filler and polyurethane foam filler in the gallery type biological reaction tank of biofilm contact oxidation, modulation run parameter, forms the A/O sewage treatment process of microbial film-active sludge symbiosis.The advantage of the method is not increase sewage treatment structure, and be applicable to existing Sewage treatment systems upgrading, this technique has stable effluent quality, COD (i.e. COD
cr, as follows), ammonia nitrogen and total nitrogen removal efficiency high, effluent quality COD is less than 50mg/L, and ammonia nitrogen is less than 5mg/L, and total nitrogen is less than 20mg/L, reach upgrading emission standard requirement.<pb pnum="1" />
Description
Technical field
The present invention relates to a kind of sewage water treatment method, particularly used in a kind of refinery sewage in-situ upgrading qualified discharge treatment process and the method biologic packing material.
Background technology
Current, China's refinery sewage disposal mainly adopts " old three covers " technique of oil removal-air supporting-biochemistry-filtration, wherein, biochemical treatment mainly adopts conventional activated sludge process and the acidication-contact oxidation technology (A/O technique) based on active sludge, and the newly-built sewage work of minority have employed biomembrance process treatment process.Biomembrance process treatment process is the general designation of a large class biological treatment, comprises microbial film acidication, catalytic oxidation, BAF, MBR etc., its common feature be attached growth of microorganisms on filling surface, formed microbial film.Adopt biomembrance process treatment process, its water outlet COD majority can reach 60 ~ 100mg/L, but is difficult to be down to lower.Further, ammonia nitrogen, the total nitrogen removal ability of some built refinery sewage treatment process are poor, are difficult to reach upgrading pollution factor Con trolling index up to standard.Therefore, refinery sewage upgrade technique, particularly not changing the home position strengthening upgrading processing technology of original structure structure feature, is the focus that refinery sewage disposal in recent years adapts to new environmental protection standard, is also most Petrochemical Enterprises sewage handling problem urgently to be resolved hurrily.
The domestic and international research report about refinery sewage upgrading standard discharge treatment technology is still few at present, and relevant bibliographical information mainly concentrates on the biochemical processing of refinery sewage work and the advanced treatment process aspect of standard discharge sewage.
The people such as Xia Wenxiang report with the results of laboratory of two sections of Activated Sludge Process Refinery Wastewater, propose to be hydrolyzed-aerobic biological film method replaces original one to expose to the sun pond, and adopts active sludge as the novel process of secondary aerobic treatment.Experiment shows, the stable effluent quality of this method Refinery Wastewater, through the residence time of 10h, and water outlet COD<100mg/L, NH
3-N<10mg/L (" technical studies of two sections of Refinery Wastewater by Activated Sludge Process ", " Qingdao College of Architectural Engineering journal ", 01 phase in 2000).
The people such as Gao Jie report the results of laboratory of Cyclic Activated Sludge System (CAST) art breading oil refining sewerage, be 0.8mg/L at DO, when pH is 7.3 ~ 7.7, technique is respectively 72%, 90% to COD, BOD clearance, also can improve sewage water denitrification effect simultaneously, TN removes can reach 65% (" Cyclic Activated Sludge System process oil refining sewerage ", " Liaoning chemical industry ", 2004,33 (7): 393-395).
The people such as Zhu Jiayi adopt fluid bed biological film technique, and carried out Waste water treatment field experiment, result shows, are 140 ~ 160m at flooding quantity
3under/h, this process outlet COD of sewage
cr<60mg/L, ammonia nitrogen <10mg/L, petroleum-type <5mg/L, reach GB8978-1996 first discharge standard (" adopting fluid bed biological film art breading oil refining sewerage ", " petrochemical technology and application ", 03 phase in 2009).
The people such as Wu Jianyuan, Peng Bo report the engineering example of membrane bioreactor (MBR) art breading oil refining sewerage; 80%, 60%, more than 90% is stabilized in respectively to the average removal rate of COD of sewage, oil, ammonia nitrogen; but water outlet COD is at 70 ~ 100mg/L; water outlet less stable (" application of MBR sewage disposal technology in oil refining sewerage "; " petrochemical complex environment protection ", 04 phase in 2006).
The people such as Zhang Tiegang report the application result of circulating type active sludge+BAF (CASS+BAF) art breading refinery height oily(waste)water, show the CASS+BAF technique primary standard that can ensure that water outlet reaches (GB8978-1996), COD<100mg/L (" application of CASS-BAF technique in Waste water treatment ", " water technology ", 02 phase in 2010).
The people such as savings space report the experimental result of employing acidication-contact oxidation technology process petrochemical effluent, 1500mg/L is less than at influent COD, water outlet COD is less than 124mg/L (" application of acidication-catalytic oxidation in process petrochemical wastewater ", " environmental engineering ", 05 phase in 2007).
The people such as Yu Zhenmin report the laboratory experiment result of bio-synergistic technology for oil refining sewerage advanced treatment.Add bioaugmentation fungus system water outlet COD and be up to 100mg/L, minimum is 58mg/L, mean value is 80mg/L, treatment effect is obviously better than not adding bioaugmentation fungus system (" application of bio-synergistic technology in refinery water process ", " Treatment of Industrial Water ", 02 phase in 2008).
The people such as Tan Zhouliang also report a kind of oil refining sewerage biological reinforced process pilot scale technology, and result shows: at influent COD, NH
4 +-N mean value is respectively 888,103mg/L, water outlet COD, NH after biological reinforced system process
4 +-N mean value is 86.7 and 7.6mg/L (" pilot scale of On Oil Refinery Wastewater Treatment By Microorganism Agent ", " water technology ", 02 phase in 2007).
Lin Suiyun, Li Songqiang report the experimental result of a kind of ozone-charcoal technique advanced treatment oil refining sewerage, and after showing this art breading, water quality leading indicator can reach surface water III ~ IV class water quality standard: COD≤13mg/L; Petroleum-type≤1mg/L (" oil refining sewerage ozone oxidation-charcoal advanced treatment water quality reuse resource utilization ", " water technology ", 10 phases in 2008).
The people etc. such as peak report the results of laboratory that Ozonation technique carries out oil refining sewerage advanced treatment, be 8.7 in pH value, ozone concn is under the optimum reaction condition of 95mg/L, the mass concentration of influent COD is 160mg/L, after ozone Oxidation Treatment, the COD of waste water reduced for more than 40% (" the biochemical treatment water outlet of ozone Oxidation Treatment refinery water ", " process water and waste water ", 02 phase in 2009).
The people such as vast stretch of wooded country ripple adopt By Electrocatalytic Oxidation technique to carry out the research of oil refining sewerage advanced treatment in indoor, process COD is 131.9mg/L, specific conductivity is that 980 μ s/cm, NaCl concentration are 2.5mmol/L, pH value be 6 refinery outside discharge water, at interelectrode distance 5mm, current density 10mA/cm
2under condition, the former water of process 1L, makes its COD be less than 30mg/L, and consumption of direct current is about 1.04KW/h (" By Electrocatalytic Oxidation degraded oil refining secondary effluent COD
crresearch ", " process water and waste water ", 06 phase in 2004).
Liu Jianyu adopts Fenton advanced oxidation processes also to carry out the research of oil refining sewerage advanced treatment, and result shows: be 230mg/L, H at biochemical treatment water outlet COD
2o
2dosage is 18mmol/L, FeSO
47H
2o dosage be 12mmol/L, reaction times 1.5h, waste water pH4 condition under, the COD clearance of secondary biochemical effluent reaches 82.61%, within dropping to 100mg/L (" Fenton chemical oxidization method advanced treatment Fine Chemistry Wastewater ", " Environmental science and technology ", 05 phase in 2009).
From above-mentioned relevant report, the refinery sewage treatment technology of current research and apply, core is various biological processing units, and except improving technique method and parameters optimization condition, the bacterial strain, biologic packing material etc. of screening tool excellent effect are all feasible research directions.Wherein, the optimization of biologic packing material is the beneficial way that existing sewage work realizes the outer row of original position upgrading process up to standard.Use the main purpose of filler to be improve the microbial biomass of biochemistry pool unit volume, the chemical property such as physical property and wetting ability such as shape, structure, porosity of filler directly affects the attachment of microbial film on filler thus affects wastewater treatment efficiency; For refinery sewage, one of subject matter that existing biologic packing material finds in test application process is that microorganism is difficult to form obvious microbial film at filling surface, therefore its effect strengthening Waste water treatment effect is difficult to manifest, this with sanitary sewage or other comparatively easy middle and high concentration sewage of degrading significantly different.In addition, the filling mode (as fixed-bed type, suspension type or fluidized-bed form) of filler in biological treatment structures (aeration tank) also has material impact to sewage disposal result, current generally believing in biological processing unit preferably uses biological fluidized filler, but, for most structures based on the biological processing unit of gallery type structure, biological fluidized filler may be assembled with water (flow) direction, how in gallery type biological treatment structures, realizing biological fluidized filler even fluidizing, is also the problem that this technology faces.Generally speaking, refinery sewage COD after current biological processing unit process substantially can ensure reach 60 ~ 100mg/L, ammonia nitrogen reaches 5 ~ 15mg/L, but is also difficult to make that the COD of bio-chemical effluent drops to below 50mg/L, ammonia nitrogen drops to below 5mg/L.If make the COD of water outlet, ammonia nitrogen value drops to lower, then need newly-built advanced treatment structures on biochemical processing process basis, but this mode increases capital construction cost on the one hand, the more important thing is for a lot of built Petrochemical Enterprises, without available floor plan.Therefore, how to utilize original structures to implement home position strengthening technology, under the condition of not new construction of structures, realize the upgrading qualified discharge of externally discharged waste water, be more significant thing.The present invention also conducts a research based on this thinking just and proposes.
Summary of the invention
One object of the present invention is to provide a kind of refinery sewage in-situ upgrading qualified discharge treatment process, for the sewage disposal technology original position upgrading of built refinery sewage work, do not increasing on new sewage treatment facility basis, technology upgrading is carried out by utilizing existing facility, the pollution factor such as COD, ammonia nitrogen, total nitrogen of effective reduction sewage, reaches more strict discharge index.
Another object of the present invention is to provide a kind of biologic packing material realized used by described refinery sewage in-situ upgrading qualified discharge treatment process.
For reaching above-mentioned purpose, on the one hand, the invention provides a kind of refinery sewage in-situ upgrading qualified discharge treatment process, the method is included in the process processing to reduce its COD, ammonia nitrogen, total nitrogen in biological processing unit to sewage, described biological processing unit comprises the gallery type biological reaction tank (abbreviation hydrolysis acidification pool) carrying out microbial film acidication and the gallery type biological reaction tank (abbreviation contact-oxidation pool) carrying out biofilm contact oxidation, at least one biological reaction tank, be filled with biological fluidized filler; Wherein:
Described biological fluidized filler is seated in rigidity cylinder mould, and the rigidity cylinder mould of filling filler is placed in order along water (flow) direction in the gallery of reaction tank;
Described biological fluidized filler comprise granular stereo hollow filler and stacking volume be the granular polyurethane foam filler of stereo hollow filler 0 ~ 3 times (namely, in biological fluidized filler of the present invention, polyurethane foam filler is optional ingredient);
Described stereo hollow filler adds active carbon powder mixing compression moulding by after the material hot melt comprising polypropylene, polyethylene and/or polyvinyl chloride, and active carbon powder accounts for 3 ~ 5% of this stereo hollow packing quality; This stereo hollow packing density is 0.96 ~ 0.98g/cm
3, specific surface area is 500 ~ 1000m
2/ m
3;
Described polyurethane foam packing specific area 1000 ~ 1500m
2/ m
3, voidage 95 ~ 98%.
On the other hand, present invention also offers a kind of biological fluidized filler for realizing above-mentioned refinery sewage in-situ upgrading qualified discharge treatment process, this biological fluidized filler comprises the granular polyurethane foam filler that stereo hollow filler and stacking volume are stereo hollow filler 0 ~ 3 times; Biological fluidized filler is used for being seated in rigidity cylinder mould to place in order along water (flow) direction in gallery type biological reaction tank; Described stereo hollow filler adds active carbon powder mixing compression moulding by after the material hot melt comprising polypropylene, polyethylene and/or polyvinyl chloride, and active carbon powder accounts for 3 ~ 5% of this stereo hollow packing quality; This stereo hollow packing density is 0.96 ~ 0.98g/cm
3, specific surface area is 500 ~ 1000m
2/ m
3; Described polyurethane foam packing specific area 1000 ~ 1500m
2/ m
3, voidage 95 ~ 98%.
The present invention is mainly to the sewage disposal technology original position upgrading of built refinery sewage work, do not increasing on new sewage treatment facility basis, technology upgrading is carried out by utilizing existing facility, particularly the filler of biological processing unit is improved, provide a kind of biological fluidized filler, for microbial film acidication-biofilm contact oxidation processing technique, effectively can reduce the pollution factor such as COD, ammonia nitrogen, total nitrogen of sewage, reach more strict discharge index.If the biological processing unit of refinery sewage work does not adopt microbial film acidication-biofilm contact oxidizing process, but more traditional activated sludge process, then activated sludge tank is divided into hydrolysis acidification pool and contact-oxidation pool, recharge filler of the present invention.Activated sludge process is changed into microbial film acidication-biofilm contact oxidizing process one of ordinary skill in the art are easy to realize.
According to specific embodiment of the invention scheme, add specific surface and wetting ability that gac can increase filler in stereo hollow filler of the present invention, be more conducive to biomembranous apposition growth.Particularly, described gac comprise in refinery coke preparing active carbon, coal activated carbon, shell preparing active carbon one or more, be preferably refinery coke preparing active carbon; More preferably, the specific surface area 1200 ~ 2000m of described gac
2/ g, granularity 300 ~ 400 order.
According to specific embodiment of the invention scheme, in filler of the present invention, described stereo hollow filler be also added with in its raw material when compression moulding account for stereo hollow packing quality 0.1% ~ 0.5% short thin filament (, described stereo hollow filler is by after polypropylene, polyethylene and/or pvc material hot melt, add active carbon powder and short thin filament, compression moulding after mixing), described short thin filament is the vinylon silk of length 1 ~ 3mm, acrylics filament and/or other fiber yarn.Being added with of these short thin filaments helps the wetting ability and the surfaceness that increase the materials such as polypropylene, polyethylene or polyvinyl chloride.
According to specific embodiment of the invention scheme, stereo hollow filler in the present invention, except the principal element (material, density, specific surface area) it being affected to wastewater treatment efficiency has aforementioned claim, to other performances if concrete shape structure etc. is without particular requirement, can being such as hollow ball, hollow cylinder, hollow ring, hollow cuboid or other special-shaped hollow structure etc., making hollow shape also mainly for meeting the requirement to described density and specific surface area in the present invention.In the present invention, preferred stereo hollow filler particle size is 10 ~ 30mm × 10 ~ 30mm × 10 ~ 30mm.In addition, preferably, stereo hollow filler superficies have fold-like structures, the dark 1 ~ 2mm of fold, and the setting of fold is mainly for increasing packing specific area to meet described requirement.In a specific embodiments of the present invention, described stereo hollow packing density is 0.96 ~ 0.98g/cm
3, specific surface is 500 ~ 1000m
2/ m
3; Its concrete shape comprises inside and outside three layers of hollow cylinder, innermost layer hollow cylinder diameter 0.4 ~ 0.5cm; Middle layer hollow cylinder diameter 1.2 ~ 1.5cm, is connected with innermost layer open circles by 4 ~ 8 seamed edges; Outermost layer open circles diameter 2.4 ~ 2.5cm, is connected with middle layer open circles by 6 ~ 12 seamed edges; Seamed edge and open circles peripheral thickness 0.8 ~ 1.0mm; Outermost layer peripheral band fold-like structures, the dark 1 ~ 2mm of fold; Cavity filling length 1.0 ~ 1.5cm.
According to specific embodiment of the invention scheme, polyurethane foam filler in the present invention, except the principal element (specific surface area, voidage) it being affected to wastewater treatment efficiency has aforementioned claim, to other performances if concrete shape structure etc. is also without particular requirement, such as, can be rule or irregular spherical, oval spherical, cylindricality or irregular abnormity etc.In the present invention, preferred polyurethane foam filler particle size is 20 ~ 40mm × 20 ~ 40mm × 20 ~ 40mm.The polyurethane foam filler meeting application claims can be commercially available, and be preferably hydrophilic polyurethane foam filler, in a specific embodiment of the present invention, the specific surface area of polyurethane foam filler used is about 1200m
2/ m
3, voidage is about 96%, and granular size is 20 ~ 40mm × 20 ~ 40mm × 20 ~ 40mm.
It should be noted that, in filler of the present invention, described polypropylene, polyethylene, polyvinyl chloride, urethane comprise their modifier, the polypropylene especially after hydrophilic modifying, polyethylene, polyvinyl chloride or urethane.Concrete hydrophilic modifying process can be carried out according to the routine operation in affiliated field.
According to specific embodiment of the invention scheme, in biological fluidized filler of the present invention, polyurethane foam filler is optional ingredient.In a specific embodiment of the present invention, only adopt stereo hollow filler, the sewage discharge requirement that refinery sewage water outlet COD is less than 50mg/L, ammonia nitrogen is less than 5mg/L, total nitrogen is less than 20mg/L can be reached.Further, contriver finds under study for action, and stereo hollow filler of the present invention and polyurethane foam filler combination can play synergy for reducing refinery sewage water outlet COD value.Preferably, biological fluidized filler of the present invention comprises stereo hollow filler and polyurethane foam filler, and the stacking volume of polyurethane foam filler is preferably 0 ~ 3 times of stereo hollow filler stacking volume, is more preferably 0.5 ~ 2 times.
As previously mentioned, for based on the biological treatment of gallery type structure, biological fluidized filler may be assembled with water (flow) direction, and even fluidizing for realizing biological fluidized filler in gallery type biological treatment structures, the type of feed of the present invention to described fluidized packing material is improved.Specifically, in refinery sewage in-situ upgrading qualified discharge treatment process of the present invention, the filler loadings in each cylinder mould is 20% ~ 65% of cylinder mould internal volume, is preferably 25% ~ 65%, is more preferably about 30% ~ 45%, cylinder mould main body is the rectangular shape (can be such as by the rectangular shape of steel wire weld) be made up of rigidity wire side, and be provided with supporting leg to make 0.3 ~ 1.2m at the bottom of cylinder mould bottom surface distance reaction tank pond, on cylinder mould, end face is at the reaction tank normal running underwater distance water surface 0.2 ~ 0.4m, each cylinder mould length is 1/5 ~ 1/30 of each gallery length, suitably can adjust according to gallery scale, usually can be 1/5 ~ 1/20 (such as, as gallery length 30 meters, cylinder mould can be designed to the long left and right of 1.5m), width is 1/3 ~ 1 of reaction tank width, at the width of gallery type biological reaction tank, the cylinder mould of 1 ~ 3 row's filling filler can be placed.The type of feed of combined stuffing of the present invention, can ensure the fluidisation of filler in each cylinder mould, and experiment confirms, in biological processing unit of the present invention, the apposition growth of microbial film on filler is good, can greatly improve biological treatment of sewage effect.Be appreciated that the Main Function of cylinder mould is location filler and ensures the fluidisation of filler in each cylinder mould, the size of mesh can be larger as far as possible under the prerequisite not making filler loss in it.
According to specific embodiment of the invention scheme, the cylinder mould quantity of the filling filler placed in each gallery can adjust according to filler loadings in single cylinder mould and sewage quality, water outlet demand, under normal circumstances, preferably can ensure that the amount of described fluidized packing material in each gallery is more than 20% of gallery inner volume.
According to specific embodiment of the invention scheme, when biological fluidized filler is the combined stuffing comprising stereo hollow filler and polyurethane foam filler, described stereo hollow filler and polyurethane foam filler can be seated in rigidity cylinder mould (such as stainless steel cylinder mould) after mixing according to specific ratio, or are seated in respectively in cylinder mould; The cylinder mould of filling filler is placed in order along water (flow) direction in gallery type biological reaction tank.More preferably, when stereo hollow filler and polyurethane foam filler are seated in cylinder mould respectively, the cylinder mould of filling stereo hollow filler and the cylinder mould of filling polyurethane foam filler are often being arranged length direction and/or are alternately being placed in direction side by side.In the present invention, described " in order " is placed and is referred to according to well-regulated position but not arbitrarily place desultorily, and such as, each cylinder mould can be dispersed layout in gallery, or arranges slightly more intensive at current upstream position.In water (flow) direction, between each cylinder mould, can placement be close to, preferably leave the spacing of more than 10cm.
According to specific embodiment of the invention scheme, also can be provided with submersible water impeller under loading the cylinder mould of filler in acidication gallery, the plug-flow direction of submersible water impeller is contrary with water (flow) direction, can ensure the Homogeneous phase mixing of sewage and suspended sludge.In addition, selected impeller under water should have enough power, ensures the fluidisation of filler in cylinder mould.
According to specific embodiment of the invention scheme, biological fluidized filler of the present invention, can be filled in the gallery of contact-oxidation pool, or in the gallery of hydrolysis acidification pool, all can play the effect reducing refinery sewage water outlet COD value, enhanced sewage treatment effect.Preferred version of the present invention be two reaction tanks gallery in be all filled with biological fluidized filler of the present invention.Described biological fluidized filler is carrying out the gallery type biological reaction tank of biofilm contact oxidation and the loading level ratio of carrying out in the gallery type biological reaction tank of microbial film acidication is 20% ~ 50%, and preferably ratio is 30% ~ 40%.Sewage accounts in 1/5 ~ 1/3 of biological processing unit total residence time in the acidication gallery residence time, and all the other residence time are in the catalytic oxidation gallery residence time.In the present invention, particular requirement is not done in the total residence time of biological processing unit to sewage, specifically can determine according to water quality situation, normally in 10 hours ~ 45 hours window.
Further, the present invention is also optimized other processing condition of biofilm contact oxidation operation.Particularly, micro-pore aeration system put by the gallery type biological reaction tank pond base fabric of biofilm contact oxidation, and aeration gas-water ratio is 8:1 ~ 12:1.
On the other hand, preferably, add the microbial strains accounting for pond body water capacity 0.05% ~ 0.2% in the gallery type biological reaction tank pond of biofilm contact oxidation and (industrially add bacterial classification normally through the bacterium liquid of amplification culture, 0.05% ~ 0.2% refer to that the bacteria liquid adding normal amplification culture amasss the per-cent accounting for pond body water capacity herein, as adopt concentrated bacterium liquid or solid fungicide or other, suitably can adjust consumption as required), described microbial strains comprises Arthrobacter, bacillus, one or more in Azomonas, preferably three kinds of bacterial classifications all add, these bacterial classifications all can adopt the conventional bacterial classification in this area, be appreciated that, preferred use degradation effect preferably bacterial classification.
On the other hand, can also (nutritive medium that the industrial biological nutrition reinforcer added normally prepares 0.05% ~ 0.5% refers to that biological nutrition reinforcer solution mentions the per-cent accounting for pond body water capacity herein to the biological nutrition reinforcer of dosing 0.05% ~ 0.5% in biofilm contact oxidation pond pond.In addition, in the present invention the percentage ratio of other unreceipted units or ratio be all adopt belonging to the conventional metering method in field, typically refer to mass ratio).Described biological reinforced nutrition agent can be used for the cultivation domestication of refinery sewage disposal microorganism, and the growth that also can be used for refinery sewage disposal biological flora is safeguarded, object is the strengthening growth ensureing dominant microflora.What this nutrition agent included but not limited to consists of: distilled water 1000g, peptone 1 ~ 3g, sucrose 5 ~ 10g, KH
2pO
40.2 ~ 0.6g, MgSO
47H
2o0.2 ~ 0.6g, NaCl0.5 ~ 2.0g, FeSO
47H
2o0.01 ~ 0.03g, CaCl
20.01 ~ 0.03g, ZnCl
20.01 ~ 0.03g, NaNO
30.5 ~ 1.5g, (NH
4)
2sO
40.5 ~ 1.5g.
In refinery sewage in-situ upgrading qualified discharge treatment process of the present invention, after biologic packing material surface microorganism is stable, the microbial film that 1 ~ 3mm is thick can be formed, from filling surface to inside, dissolved oxygen will form certain gradient, filling surface carries out nitrification, and inside carries out denitrification, realizes removing of part ammonia nitrogen and total nitrogen in same oxidation pond.Contact-oxidation pool water outlet enters second pond, and after mud-water separation, sewage flows out through second pond overflow weir, and its water outlet COD is less than 50mg/L, and ammonia nitrogen is less than 5mg/L, and total nitrogen is less than 20mg/L.
Because method of the present invention is mainly used for the sewage disposal technology original position upgrading of built refinery sewage work, do not increasing on new sewage treatment facility basis, the filler of biological processing unit and processing condition are improved and optimized, according to specific embodiment of the invention scheme, other operations of refinery sewage in-situ upgrading qualified discharge treatment process of the present invention can be carried out according to existing facility or with reference to the routine techniques in affiliated field.Usually, the refinery sewage in-situ upgrading qualified discharge treatment process of complete set mainly comprises the process processed according to following operation sewage:
Oil removal sedimentation-air supporting-Activated sludge-biofilm acidication-Activated sludge-biofilm catalytic oxidation-second pond-water outlet.
Wherein, described oil removal settlement treatment removes thick dispersed oil, suspended substance and part COD in sewage, makes its water outlet COD lower than 450mg/L; In the present invention, preferably, oil removal settlement treatment hydraulic detention time is 10 ~ 15h.
Described air-flotation process unit removes finely divided oil, oil in water emulsion, fine particle suspended substance, makes its water outlet COD be less than 300mg/L.In the present invention, preferably, by pressurized dissolved air flotation mode, under flotation agent effect, realize the separation of pollutent, wherein, described pressure air-dissolving pressure tank controls at 0.4 ~ 0.45MPa, and described flotation agent is aluminium salt and polyacrylamide, and described aluminium salt is selected from Tai-Ace S 150, polyaluminium sulfate, polymerize aluminum chloride, the best is polymerize aluminum chloride, and dosage is 50 ~ 150mg/L; Described polyacrylamide is negatively charged ion hydro-polyacrylamide or cationic polyacrylamide, and be preferably cationic polyacrylamide, its number-average molecular weight is 300 ~ 6,000,000, and dosage is 5 ~ 20mg/L.
Described Activated sludge-biofilm acidication and described Activated sludge-biofilm catalytic oxidation carry out respectively in described acidication and contact-oxidation pool.
In addition, the water after biological processing unit process also can carry out according to existing facility or with reference to the routine techniques in affiliated field through the process of second pond to water outlet.
According to the preferred embodiment of the invention, in method of the present invention, before contact-oxidation pool overflow weir, sewage backflow device is installed, by the mixed-liquor return of 50% ~ 200% to hydrolysis acidification pool feed-water end water dispensing apparatus, further intensified anti-nitrated denitrification functions.
Second pond return sludge ratio 30% ~ 70%, sludge reflux is to hydrolysis acidification pool feed-water end, and all the other mud enter sludge condensation processing unit, and mud is landfill disposal after concentrated, centrifuge dehydration, press filtration.
The present invention has the following advantages and effect:
1. the present invention is mainly used in refinery sewage in-situ upgrading qualified discharge, namely for the basis at existing structures, when keeping treatment system total residence time constant, by enhance biological treatment technique, improve wastewater treatment efficiency, realize upgrading qualified discharge.With newly-built sewage treatment facility, extend treatment process or increase advanced treatment process and compare, also have that floor space is few, the advantage of capital construction less investment.
2. the present invention is in the hydrolysis acidification pool of Activated sludge-biofilm, enhances the mixing mass transfer of suspension microorganism mud, microbial film and sewage, achieves the internal reflux circulation of hydrolysis acidification pool suspended sludge.
3. the present invention replaces placement two kinds of fluidisation biologic packing materials in the contact-oxidation pool of Activated sludge-biofilm, especially the polypropylene of high surface powdered carbon modification, polyethylene or the hollow stereo biological filler of polyvinyl chloride, they have better wetting ability, be easy to microorganic adhesion, and achieve the homogeneous fluidization of filler in gallery structures, solve filler in structures skewness, easily accumulate in the difficult problem in direction under current, enhance biological treatment effect.
4. the present invention is by oil removal sedimentation-air supporting-Activated sludge-biofilm acidication-Activated sludge-biofilm catalytic oxidation-second pond-go out water treatment, refinery sewage water outlet COD is less than 50mg/L, ammonia nitrogen is less than 5mg/L, and total nitrogen is less than 20mg/L, reaches more strict sewage drainage standard limit value.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, now in conjunction with specific examples, following detailed description is carried out to technical scheme of the present invention, these examples should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.The step do not mentioned in detail in each embodiment all can be carried out according to the routine operation in affiliated field.
Disclose a kind of technique upgrade processing method of refinery sewage water treatment method, particularly biochemical treatment in this specific embodiments, the former water in sewage farm is through processing with lower unit or step:
Oil removal settlement treatment;
Air-flotation process;
Enhanced biological film A/O Activated sludge-biofilm art breading;
Oil removal settlement treatment unit.Mainly realize the removal of thick dispersed oil, suspended substance and part COD in sewage, its water outlet COD generally lower than 450mg/L, generally at 300 ~ 400mg/L.Oil removal settlement treatment hydraulic detention time is 10 ~ 15h, while realizing oil removing and suspended substance, to the homogenizing of water quality.Oil removal sedimentation unit structures are gallery type structure, are generally 2 ~ 3 gallerys, and by water (flow) direction, next gallery water outlet can be promoted to a gallery entrance water dispensing apparatus, realizes sewage homogeneous object.Frizing mud scraper all installed by each oil removal settling bowl gallery, and oil flows to corresponding retrieving arrangement respectively to mud.
Air-flotation process unit.Mainly realize the removal of finely divided oil, oil in water emulsion, fine particle suspended substance, its water outlet COD is less than 300mg/L, generally at 200 ~ 260mg/L.By pressurized dissolved air flotation mode, under flotation agent effect, realize the separation of pollutent.Pressure air-dissolving pressure tank controls at 0.4 ~ 0.45MPa.Flotation agent is aluminium salt and polyacrylamide.Flotation agent aluminium salt is chosen as Tai-Ace S 150, polyaluminium sulfate, polymerize aluminum chloride, and the best is polymerize aluminum chloride, and dosage is generally 50 ~ 150mg/L, and optimum add amount is at 100 ~ 120mg/L.Polyacrylamide can be negatively charged ion hydro-polyacrylamide and cationic polyacrylamide, better with cationic polyacrylamide, and its number-average molecular weight is 300 ~ 6,000,000, and dosage is 5 ~ 20mg/L, should dosage be 5 ~ 10mg/L.
Water outlet after air-flotation process enters biological processing unit.This is core content of the present invention.Usually, Waste water treatment adopts activated sludge process or the improving technique based on active sludge, as SBR, CASS, CAST technique etc.The organic composition analysis of the biochemical unit pollutent of certain refinery sewage work is shown, the branched alkane hydro carbons of C number between 10 ~ 20, ester class, ethers, aldehydes are the organism that biochemical unit is difficult to degrade, and in the water outlet of Activated Sludge Process, to compare other organism higher for their content.In order to improve above-mentioned organic biological degradation effect, the present invention is based on Microbial Communities in Activated Sludge group, the microorganism above-mentioned pollutent being had to better degradation effect as known in the art can be added, be mainly Arthrobacter (Arthrobacter), bacillus (Bacillus) and Azomonas (Azomonas).Each bacterial classification add-on all can refer to the routine operation of this area or the suggestion according to bacterial classification supplier.
The biological fluidized filler used in biological processing unit is one of key of the present invention.It is the stereo hollow filler manufactured primarily of modified polypropene, polyethylene or pvc material that biologic packing material of the present invention comprises 2 kinds: one, this cavity filling adds 3 ~ 5% (by filler total mass) Powdered Activated Carbon Homogeneous phase mixing by polypropylene, polyethylene or pvc material (powdery) and makes, activated carbon raw material can be by refinery coke, coal, shell etc., preferred refinery coke preparing active carbon, its specific surface area 1200 ~ 2000m
2/ g, granularity of activated carbon 300 ~ 400 order.Cavity filling mixes a rear compression moulding by adding Powdered Activated Carbon after polypropylene, polyethylene or polyvinyl chloride hot melt, and its density is 0.96 ~ 0.98g/cm
3, specific surface area is 500 ~ 1000m
2/ m
3.Add the specific surface and wetting ability that gac object is increase filler in polypropylene or pvc material, be more conducive to biomembranous apposition growth.The short thin filaments such as the vinylon silk of length 1 ~ 3mm, acrylics filament and other fiber yarn also can be added in stereo hollow filler, its mass ratio is generally 0.1% ~ 0.5%, is mainly used in the wetting ability and the surfaceness that increase the materials such as polypropylene, polyethylene or polyvinyl chloride.Another kind of biologic packing material is the polyurethane foam filler that alternative comprises, and its specification is 20 ~ 30mm × 20 ~ 30mm × 20 ~ 30mm, specific surface 1200m
2/ m
3, voidage 96%.
Above-mentioned 2 kinds of fluidized packing materials of the present invention gallery type biological treatment structures in even fluidizing be by fluidized packing material is seated in specification can according to the stainless steel cylinder mould of gallery structures pond body specification modulation in realize, particular by gallery structures along water (flow) direction place in order several in-built biologic packing material stainless steel cylinder mould realize.Fluidized packing material loadings is 25% ~ 65% of cylinder mould volume, stainless steel cylinder mould is welded by the square steel of 20 ~ 30mm, 4 supporting leg height of square steel frame should at body normal running underwater, pond 0.2 ~ 0.4m, 0.3 ~ 1.2m at the bottom of cylinder mould lower bottom part distance pond, cylinder mould upper top is apart from the water surface 0.2 ~ 0.4m, the length of stainless steel cylinder mould is 1/5 ~ 1/20 of each gallery length, and width is 1/3 ~ 1 of pond body width.The mesh of the stainless (steel) wire selected should be less than the geometrical dimension of biologic packing material, avoids filler to run off.
Biological processing unit of the present invention realizes with enhanced biological film acidication (A)-enhanced biological film catalytic oxidation (O) technique, wherein the acidication gallery unit residence time accounts for total residence time 1/5 ~ 1/3, and all the other residence time distribute to catalytic oxidation gallery unit.When total residence time is constant, by adding the preferred microbial bacteria of the present invention and even fluidizing biologic packing material, change operation process, the upgrading qualified discharge of pollution factor can be realized, its water outlet COD is less than 50mg/L, and ammonia nitrogen is less than 5mg/L, and total nitrogen is less than 20mg/L.
Specifically, enhanced biological film water solution acidification technique of the present invention realizes in the following manner: the water outlet after air flotation cell process, enter enhanced biological film acidication unit, this unit carries out in gallery biological reaction tank, above-mentioned biologic packing material cylinder mould and the submersible water impeller of several interior filling polyurethane foam filler is placed in biological reaction tank, the plug-flow direction of impeller is contrary with water (flow) direction under water, to ensure the Homogeneous phase mixing of acidication unit sewage and suspended sludge, in addition, selected impeller under water should have enough power, ensure the fluidisation of filler in cylinder mould.The water (flow) direction cross section of microbial film acidication unit impeller installation site under water answers cross section that hydraulic detention time should be had to be 1.5 ~ 2h sludge settling section to this pond effluent weir, the mud of sedimentation is back to hydrolysis acidification pool feed-water end water dispensing apparatus by sludge pump part interval, and part interval enters second pond.
Biofilm contact oxidizing process of the present invention realizes in the following manner: the water outlet of microbial film acidication enters biofilm contact oxidation pond, and micro-pore aeration system put by this pond, pond base fabric, and aeration gas-water ratio is 8:1 ~ 12:1.Alternately place in order in pond and the stereo hollow filler of blending activity charcoal powder and the stainless steel cylinder mould of polyurethane foam filler are housed.Bio-reactor starts the appropriate to the occasion superior microorganism bacterial classification accounting for pond body water capacity 0.05% ~ 0.2% to the input of this pond, and the biological nutrition reinforcer of dosing 0.1% ~ 0.5%, after guaranteeing biochemistry pool steady running, there is abundanter microorganism species.After biologic packing material surface microorganism is stable, form the microbial film that 1 ~ 3mm is thick, from filling surface to inside, dissolved oxygen will form certain gradient, filling surface carries out nitrification, and inside carries out denitrification, realizes removing of part ammonia nitrogen and total nitrogen in same oxidation pond.Contact-oxidation pool water outlet enters second pond, and after mud-water separation, sewage flows out through second pond overflow weir, and its water outlet COD is less than 50mg/L, and ammonia nitrogen is less than 5mg/L, and total nitrogen is less than 20mg/L.
Before contact-oxidation pool overflow weir, sewage backflow device is installed, by the mixed-liquor return of 50% ~ 200% to acidication section water-in, further intensified anti-nitrated denitrification functions.
Second pond return sludge ratio 30% ~ 70%, sludge reflux is to hydrolysis acidification pool feed-water end water dispensing apparatus, and all the other mud enter sludge condensation processing unit, and mud is landfill disposal after concentrated, centrifuge dehydration, press filtration.
By oil removal sedimentation-air supporting-Activated sludge-biofilm acidication-Activated sludge-biofilm catalytic oxidation-second pond-go out water treatment, refinery sewage water outlet COD is less than 50mg/L, ammonia nitrogen is less than 5mg/L, and total nitrogen is less than 20mg/L, reaches more strict sewage drainage standard limit value.
Comparative example 1:
The former water COD580mg/L of oil refining sewerage, after oil removal process, 420mg/L, pH are 8.1.Technique is traditional activated sludge process, mainly comprises oil removal sedimentation-air supporting-active sludge-second pond-water outlet.Wherein, air flotation cell adds 150mg/L by polyaluminium sulfate, and cationic polyacrylamide adds 10mg/L and configures flotation agent.Active sludge unit adopts 4 that manufactured by carbon steel, that specification is 4000mm × 1500mm × 3000mm series connection gallery rectangle aeration tanks to carry out simultaneous test, each gallery aeration tank hydraulic detention time is 5h, mean sludge concentration 3800mg/L, gas-water ratio is 10:1, from effluent weir leading portion 1m returning aeration pond, the 4th aeration tank mixed solution to the reflux ratio of the 1st aeration tank feed-water end be 150%, the return sludge ratio 60% of second pond.
Under these processing condition, Inlet and outlet water water-quality guideline is shown in Table 1.Visible, conventional activated sludge aeration technique, COD drops to 59.7mg/L by the average 218mg/L after air supporting, ammonia nitrogen drops to 12mg/L by 16.4mg/L, but total nitrogen only reduces 1.7mg/L, is difficult to reach COD and is less than 50mg/L, ammonia nitrogen is less than 5mg/L, and total nitrogen is less than the upgrading index request of 20mg/L.
Table 1 oil refining sewerage activated sludge method processing technique each section of Pollutant levels (mg/L)
Comparative example 2:
The technique of comparative example 1 is changed, active sludge treatment unit is changed into Activated sludge-biofilm acidication-Activated sludge-biofilm catalytic oxidation treatment process, specifically, wherein the 1st activated sludge aeration pond is hydrolysis acidification pool, commercially available modification (mainly hydrophilic modifying) the polyurethane foam filler of 25% water capacity is added in pond, its specification is 20mm × 20mm × 20mm, and specific surface area is about 1200m
2/ m
3, voidage is about 96%; 2nd ~ 4th totally 3 aeration tanks be contact-oxidation pool, add identical polyurethane foam filler in pond, the ratio of adding is 25%.From effluent weir leading portion 1m returning aeration pond, the 4th aeration tank mixed solution to the reflux ratio of the 1st aeration tank feed-water end be 150%, the return sludge ratio 60% of second pond.
After stabilization, the water water quality of mensuration the results are shown in Table shown in 2.Water outlet COD, ammonia nitrogen and total nitrogen mean value can reach 49.5mg/L, 7.8mg/L, 18.6mg/L respectively, be difficult to the stable requirement reaching upgrading discharge, and in process of the test, fluidized packing material are assembled along water (flow) direction, cannot realize the homogeneous fluidization of biologic packing material.
Table 2 oil refining sewerage original position upgrading processing technique each section of Pollutant levels (mg/L)
Embodiment 1:
Modified polyurethane fluidized packing material in comparative example 1 is changed into the cylindric hollow 3-D filler of activated carbon modified polypropylene of the present invention.Gac (specific surface area 1300m during this filler thermoforming
2/ g, granularity 300 ~ 400 order) to account for polyacrylic mass percent be 3%, also be added with 1 ~ 3mm acrylics filament of 0.1%, filler after shaping is the hollow cylinder assembling structure of inside and outside 2 layers, wherein interior body diameter 1.2cm, outside cylinder diameter 2.5cm, connected by 8 seamed edges between inside and outside cylinder, the density of hollow cylindrical filler is 0.98g/cm
3, specific surface area is about 800m
2/ m
3.This hollow 3-D filler being placed on specification is in the rectangle stainless steel cylinder mould of 950mm × 1400mm × 2500mm, the mesh of stainless steel cylinder mould is 1cm × 1cm, filler dosage accounts for 30% of netpen volume, then be emitted on by 4 cylinder moulds in the biochemistry pool (i.e. the rectangle aeration tank of comparative example 1) that specification is 4000mm × 1500mm × 3000mm, 16 stainless steel cylinder moulds placed altogether by whole treatment unit.Its operation process is identical with comparative example 1, and the 1st is the hydrolysis acidification pool of Activated sludge-biofilm, the 2nd ~ 4th totally 3 be the contact-oxidation pool of Activated sludge-biofilm.Other operational conditions are with comparative example 1.
When after system run all right, the water quality of mensuration the results are shown in Table shown in 3.Visible, adopt stereo hollow filler of the present invention and after making filler reasonable layout, water outlet COD, ammonia nitrogen and total nitrogen mean value can drop to 42.5mg/L, 2.5mg/L, 16.9mg/L respectively, the requirement of upgrading qualified discharge can be reached.
Table 3 oil refining sewerage original position upgrading processing technique each section of Pollutant levels (mg/L)
Embodiment 2:
Stereo hollow filler cylinder mould in embodiment 1 is made into the cavity filling cylinder mould of alternating discharge and modified polyurethane filler cylinder mould (polyurethane foam filler, cavity filling are identical with aforementioned comparison's example 2 and embodiment 1 respectively), namely each biochemistry pool is according to following order discharge filler: modified polyurethane filler cylinder mould-stereo hollow filler cylinder mould-modified polyurethane filler cylinder mould-stereo hollow filler cylinder mould.The filler loadings of each cylinder mould is 30% of cylinder mould volume, and the size of cylinder mould is all identical with embodiment 1 with specification and other operating parameter etc.
After steady running, each process section effluent quality index is shown in Table 4.Visible, after adopting above-mentioned 2 kinds of modification biological fillers and uniform filling fluidisation distribution mode, secondary clarifier effluent COD, ammonia nitrogen and total nitrogen all can reach more strict discharge index, and comparatively embodiment 1 has further reduction, and effluent quality is more stable.
Table 4 oil refining sewerage original position upgrading processing technique each section of Pollutant levels (mg/L)
Embodiment 3:
The filler of filler cylinder mould in embodiment 2 is respectively increased by 10%, namely filler dosage is about 40% of biochemistry pool water capacity, aeration tank return current ratio of the mixed liquid 200%, return sludge ratio 40%, other condition is identical with embodiment 2, and after steady running, each process section effluent quality index is shown in Table 5.Visible, after filler brings up to 40% by 30%, have further improvement to the control of water outlet COD, ammonia nitrogen, but its effect is very unobvious.
Table 5 oil refining sewerage original position upgrading processing technique each section of Pollutant levels (mg/L)
By above Waste water treatment method of the present invention, do not changing on the original structure base in sewage farm, by changing operation process, and adopt biologic packing material and the implementation method thereof of modification of the present invention, the upgrading qualified discharge of refinery sewage can be realized, meet more strict sewage discharge index.
Claims (12)
1. a refinery sewage in-situ upgrading qualified discharge treatment process, the method is included in the process processing to reduce its COD, ammonia nitrogen, total nitrogen in biological processing unit to sewage, described biological processing unit comprises the gallery type biological reaction tank carrying out microbial film acidication and the gallery type biological reaction tank carrying out biofilm contact oxidation, at least one biological reaction tank, be filled with biological fluidized filler; Wherein:
Described biological fluidized filler is seated in rigidity cylinder mould, and the rigidity cylinder mould of filling filler is placed in order along water (flow) direction in the gallery of reaction tank;
Described biological fluidized filler comprises the granular polyurethane foam filler that granular stereo hollow filler and stacking volume are stereo hollow filler 0 ~ 3 times;
Described stereo hollow filler adds active carbon powder mixing compression moulding by after the material hot melt comprising polypropylene, polyethylene and/or polyvinyl chloride, and active carbon powder accounts for 3 ~ 5% of this stereo hollow packing quality; This stereo hollow packing density is 0.96 ~ 0.98g/cm
3, specific surface area is 500 ~ 1000m
2/ m
3;
Described polyurethane foam packing specific area 1000 ~ 1500m
2/ m
3, voidage 95 ~ 98%;
Wherein, the filler loadings in each cylinder mould is 20% ~ 65% of cylinder mould internal volume; Cylinder mould main body is the rectangular shape be made up of rigidity wire side, and be provided with supporting leg with make cylinder mould bottom surface apart from end face on 0.3 ~ 1.2m, cylinder mould at the bottom of reaction tank pond in reaction tank normal running underwater apart from the water surface 0.2 ~ 0.4m, each cylinder mould length is 1/5 ~ 1/30 of each gallery length, width is 1/3 ~ 1 of reaction tank width, at the width of gallery type biological reaction tank, place the cylinder mould of 1 ~ 3 row's filling filler;
Wherein, described stereo hollow filler and polyurethane foam filler are mixed packings or are seated in respectively in cylinder mould.
2. refinery sewage in-situ according to claim 1 upgrading qualified discharge treatment process, wherein, described gac comprise in refinery coke preparing active carbon, coal activated carbon, shell preparing active carbon one or more, the specific surface area 1200 ~ 2000m of gac
2/ g, granularity 300 ~ 400 order.
3. refinery sewage in-situ upgrading qualified discharge treatment process according to claim 1, wherein, described stereo hollow filler is also added with the short thin filament accounting for stereo hollow packing quality 0.1% ~ 0.5% in its raw material when compression moulding, described short thin filament is the vinylon silk of length 1 ~ 3mm, acrylics filament and/or other fiber yarn.
4. refinery sewage in-situ upgrading qualified discharge treatment process according to claim 1, wherein:
Described stereo hollow filler is hollow ball, hollow cylinder, hollow ring, hollow cuboid or special-shaped hollow structure, and granular size is 10 ~ 30mm × 10 ~ 30mm × 10 ~ 30mm; Stereo hollow filler superficies have fold-like structures, the dark 1 ~ 2mm of fold;
Described polyurethane foam filler particle size is 20 ~ 40mm × 20 ~ 40mm × 20 ~ 40mm.
5. refinery sewage in-situ upgrading qualified discharge treatment process according to claim 1, wherein,
When stereo hollow filler and polyurethane foam filler are seated in cylinder mould respectively, the cylinder mould of filling stereo hollow filler and the cylinder mould of filling polyurethane foam filler are often being arranged length direction and/or are alternately being placed in direction side by side.
6. refinery sewage in-situ upgrading qualified discharge treatment process according to claim 1, wherein, the cylinder mould loading filler in acidication gallery is arranged with submersible water impeller, and the plug-flow direction of submersible water impeller is contrary with water (flow) direction.
7. refinery sewage in-situ upgrading qualified discharge treatment process according to claim 1, wherein,
Micro-pore aeration system put by the gallery type biological reaction tank pond base fabric of biofilm contact oxidation, and aeration gas-water ratio is 8:1 ~ 12:1;
The microbial strains accounting for pond body water capacity 0.05% ~ 0.2% is added in the gallery type biological reaction tank pond of biofilm contact oxidation, and the biological nutrition reinforcer of dosing 0.05% ~ 0.5%; Described microbial strains comprise in Arthrobacter, bacillus, Azomonas one or more.
8. refinery sewage in-situ upgrading qualified discharge treatment process according to claim 1, wherein, described biological fluidized filler is carrying out the gallery type biological reaction tank of biofilm contact oxidation and the loading level ratio of carrying out in the gallery type biological reaction tank of microbial film acidication is 20% ~ 50%; Sewage accounts in 1/5 ~ 1/3 of biological processing unit total residence time in the acidication gallery residence time, and all the other residence time are in the catalytic oxidation gallery residence time.
9. refinery sewage in-situ upgrading qualified discharge treatment process according to claim 8, wherein, described biological fluidized filler is carrying out the gallery type biological reaction tank of biofilm contact oxidation and the loading level ratio of carrying out in the gallery type biological reaction tank of microbial film acidication is 30% ~ 40%.
10. refinery sewage in-situ upgrading qualified discharge treatment process according to claim 1, the method comprises the process processed according to following operation refinery sewage:
Oil removal sedimentation-air supporting-Activated sludge-biofilm acidication-Activated sludge-biofilm catalytic oxidation-second pond-water outlet;
Wherein, described oil removal settlement treatment removes thick dispersed oil, suspended substance and part COD in sewage, makes its water outlet COD lower than 450mg/L; Oil removal settlement treatment hydraulic detention time is 10 ~ 15h;
Described air-flotation process unit removes finely divided oil, oil in water emulsion, fine particle suspended substance, makes its water outlet COD be less than 300mg/L.
11. refinery sewage in-situ upgrading qualified discharge treatment processs according to claim 10, wherein, described air-flotation process unit is by pressurized dissolved air flotation mode, under flotation agent effect, realize the separation of pollutent, wherein, described pressure air-dissolving pressure tank controls at 0.4 ~ 0.45MPa, described flotation agent is aluminium salt and polyacrylamide, described aluminium salt be selected from Tai-Ace S 150, polyaluminium sulfate, polymerize aluminum chloride one or more, dosage is 50 ~ 150mg/L; Described polyacrylamide is negatively charged ion hydro-polyacrylamide or cationic polyacrylamide.
12. refinery sewage in-situ upgrading qualified discharge treatment processs according to claim 11, described polyacrylamide is cationic polyacrylamide, and its number-average molecular weight is 300 ~ 6,000,000, and dosage is 5 ~ 20mg/L.
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| CN101113059A (en) * | 2007-06-22 | 2008-01-30 | 哈尔滨工业大学 | Method for low-temperature denitrification phosphorous removal |
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