CN109809638A - Landfill leachate is without membrane treating method and system - Google Patents
Landfill leachate is without membrane treating method and system Download PDFInfo
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- CN109809638A CN109809638A CN201910148785.XA CN201910148785A CN109809638A CN 109809638 A CN109809638 A CN 109809638A CN 201910148785 A CN201910148785 A CN 201910148785A CN 109809638 A CN109809638 A CN 109809638A
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- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 43
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- 230000003647 oxidation Effects 0.000 claims abstract description 53
- 238000012545 processing Methods 0.000 claims abstract description 45
- 238000001556 precipitation Methods 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 32
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- 239000006228 supernatant Substances 0.000 claims abstract description 22
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- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 230000001376 precipitating effect Effects 0.000 claims abstract description 18
- 239000010802 sludge Substances 0.000 claims description 36
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 23
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 230000005587 bubbling Effects 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 12
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000005864 Sulphur Substances 0.000 claims description 3
- 239000007800 oxidant agent Substances 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 25
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 13
- 239000012141 concentrate Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 12
- 239000010813 municipal solid waste Substances 0.000 description 8
- 238000000926 separation method Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 5
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- 238000006396 nitration reaction Methods 0.000 description 3
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- 238000012546 transfer Methods 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
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- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
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- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
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- DNJIEGIFACGWOD-UHFFFAOYSA-N ethanethiol Chemical compound CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 description 1
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- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The present invention relates to a kind of landfill leachates without membrane treating method and system, and method includes the following steps: that acidification is hydrolyzed to percolate；Denitrification processing is carried out to percolate；Nitrification processing is carried out to percolate；Percolate after nitrification processing carries out biochemical precipitation process；The supernatant that biochemical precipitation process obtains carries out oxidation processes, obtains qualified discharge liquid.System includes the oil removing unit being successively connected along percolate circulating direction, hydrolysis acidification unit, denitrification unit, de-nitrification unit, biochemical precipitation unit and oxidation unit.The present invention is efficiently treated through landfill leachate using hydrolysis acidification processing → denitrification-nitrification processing → biochemistry precipitating → oxidation processes process flow, COD, ammonia nitrogen, the total nitrogen that can be effectively removed in percolate can obtain coloration and COD effluent quality all up to standard；Membrane module is not used, avoids the cumbersome problem washed film and replace film, and avoid the processing problem of film concentrate.
Description
Technical field
The invention belongs to environmental technology fields, especially technical field of landfill leachate treatment, and in particular to a kind of rubbish
Percolate is without membrane treating method and system.
Background technique
With the development and progress of the mankind, garbage-surrounded city situation is more severe, the disconnected municipal refuse increased and can not bear
The rubbish stench received becomes the thorny problem in treatment of urban garbage.Landfill leachate refers to the rubbish in refuse landfill
Moisture, the sleet water and other moisture into landfill yard itself contained, deducts the saturation moisture capacity of rubbish, overburden layer, and passes through
The organic wastewater of a kind of high concentration going through waste layer and overburden layer and being formed.
Landfill leachate is the big high concentrated organic wastewater of a kind of high COD, high ammonia nitrogen, variation water quality.Currently, main both at home and abroad
Wanting processing method is membrane processing method: pretreatment+Anaerobic Treatment+nitration denitrification+ultrafiltration+nanofiltration+reverse osmosis.It is discharged using embrane method
Water quality is good, but membrane process has the problem of concentrate, not yet solves always.
Summary of the invention
The present embodiments relate to a kind of landfill leachates without membrane treating method and system, can at least solve the prior art
Segmental defect.
The present embodiments relate to a kind of landfill leachates without membrane treating method, includes the following steps:
Acidification is hydrolyzed to percolate in S1；
S2 carries out denitrification processing to percolate；
S3 carries out nitrification processing to percolate；
S4, the percolate after nitrification processing carry out biochemical precipitation process；
S5, the supernatant that biochemical precipitation process obtains carry out oxidation processes, obtain qualified discharge liquid.
As one of embodiment, in S5, the concentrated sulfuric acid, ferrous sulfate heptahydrate and dioxygen are added into biochemistry precipitating supernatant
Water.
As one of embodiment, in S5, the concentration of the ferrous sulfate heptahydrate added is 25%~30%, dosage is 8~
20L/m3Treatment fluid；The concentration of the hydrogen peroxide added is 25%~30%, and dosage is 2~8L/m3Treatment fluid.
As one of embodiment, in S5, oxidation processes be included in oxidation reaction zone carry out oxidation and oxidation precipitation area into
Row precipitating, wherein biochemistry precipitating supernatant is 2~6h in the oxidation reaction zone residence time, and solution is in the oxygen after oxidation
The change settling zone residence time is 1~3h.
As one of embodiment, which further includes the S0 step carried out before S1 without membrane treating method,
The S0 step is to carry out oil removal treatment to percolate.
As one of embodiment, in S0, using oil removal by air bubbling technique, ferrous sulfate heptahydrate and poly- is added to air bearing reaction zone
Acrylamide.
As one of embodiment, in S0, the concentration of the ferrous sulfate heptahydrate added is 15%~28%, dosage is 3~
18L/m3Treatment fluid；The concentration of the polyacrylamide added is 0.05%~0.6%, and dosage is 3~15L/m3Treatment fluid.
The present embodiments relate to a kind of landfill leachates without embrane method processing system, including successively along percolate circulating direction
Oil removing unit, hydrolysis acidification unit, denitrification unit, de-nitrification unit, biochemical precipitation unit and the oxidation unit of linking, it is described to remove
Oily unit is equipped with percolate water inlet pipe, in oxidation unit, adds oxidant into the biochemical precipitating supernatant being discharged into, with
To relief liquor body up to standard.
As one of embodiment, which further includes sludge dewatering unit without embrane method processing system, the oil removing
The sludge outlet of the sludge outlet of unit, the sludge outlet of biochemical precipitation unit and the oxidation unit with the sludge dewatering
Unit connection.
As one of embodiment, each unit, which is integrated and connected, to be an integral structure.
The embodiment of the present invention at least has the following beneficial effects:
Landfill leachate provided by the invention is without membrane treating method and system, using hydrolysis acidification processing → denitrification-
Nitrification processing → biochemistry precipitating → oxidation processes process flow is efficiently treated through landfill leachate, can be effectively removed
(removal rate are up to 95% or more) such as COD, ammonia nitrogen, total nitrogen in percolate can obtain coloration and COD water outlet water all up to standard
Matter；This method does not use membrane module, avoids the cumbersome problem washed film and replace film, and avoids the processing hardly possible of film concentrate
Topic.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is structural schematic diagram of the landfill leachate provided in an embodiment of the present invention without embrane method processing system.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one
Such as Fig. 1, the embodiment of the present invention provides a kind of landfill leachate without membrane treating method, includes the following steps:
Acidification is hydrolyzed to percolate in S1；
S2 carries out denitrification processing to percolate；
S3 carries out nitrification processing to percolate；
S4, the percolate after nitrification processing carry out biochemical precipitation process；
S5, the supernatant that biochemical precipitation process obtains carry out oxidation processes, obtain qualified discharge liquid.
In the above method, specifically:
The COD of landfill leachatecrHigher (up to 10000-20000mg/L), organic loading is big.In S1, hydrolysis acidification
Processing can effectively improve the biodegradability of percolate, improve the efficiency and effect of subsequent biochemical processing.Hydrolysis acidification processing
Hydrolysis acidification pool/hydrolization and acidification tank of this field routine can be used, wherein being handled using biologic packing material, further preferably
Using elastic biological filler, diving mixer, effluent weir and mud return line etc., submersible agitating are set in hydrolysis acidification pool/tank
Machine is according to 4~8W/m3Power density match mixing plant, return sludge ratio be 1~4:1.In the present embodiment, it is preferable that water
The solution acidification time be 10~12h, i.e., landfill leachate in hydrolysis acidification pool/hydrolization and acidification tank the residence time be 10~
12h。
In S2, denitrification processing is carried out to hydrolysis acidification treated landfill leachate, the nitrate in percolate can be made
It is nitrogen with Nitrite transformation, realizes the removal of ammonia nitrogen and total nitrogen in percolate.This field routine can be used in denitrification processing
Denitrification pond/denitrification tank further preferably use elastic biological filler, instead wherein being handled using biologic packing material
Diving mixer etc. is set in nitrification tank/tank, and diving mixer is according to 4~8W/m3Power density match mixing plant.This reality
It applies in example, it is preferable that the denitrification processing time is 0.3~1 day, i.e. percolate residence time in denitrification pond/denitrification tank
It is 0.3~1 day.
In S3, for carrying out nitrification processing to percolate, majority of organic pollutants is dropped in nitrification zone in percolate
Solution, and most of NH by the effect of nitrifier, in percolate3- N is oxidized to nitrite or nitrate.Nitrification processing
Nitrification tank/nitrating pot of this field routine can be used, configure blower；Generally, it nitrifies and is equipped between container and denitrification container
Sewage backflow pipe.Percolate residence time in above-mentioned nitrification container is 2~6 days, and sewage backflow ratio is 2~6:1.
For percolate after denitrification-nitrification processing, sludge concentration is higher.Therefore, the percolate in S4, after biochemical treatment
Precipitation process is carried out in biochemical precipitation unit 500, sludge settling can be separated, wherein supernatant carries out subsequent oxidation
Processing, the high-efficiency activated sludge precipitated may return to biochemical treatment step, that is, may return to denitrification container, or be back to
Nitrify container.In the present embodiment, residence time of the percolate in biochemical precipitation unit 500 is 1~3h, be can get preferable dirty
Mud separating effect.
Biochemistry precipitating supernatant enters oxidation unit 600 and carries out oxidation processes, has with what degradation was difficult to be degraded by microorganisms
Machine object guarantees that effluent color dilution and COD are up to standard.In the present embodiment, in oxidation unit 600, biochemical precipitating supernatant can be made to carry out
Efficient oxidation reaction；Preferably the concentrated sulfuric acid, ferrous sulfate heptahydrate and hydrogen peroxide, treatment effect are added into biochemistry precipitating supernatant
It is preferable:
Specific oxidation reaction mechanism is as follows:
The mechanism of production of OH:
Fe2++H2O2→Fe3++·OH+OH-
Fe3++H2O2→Fe2++HO2·+H+
Fe2++·OH→Fe3++OH-
Fe3++HO2·→Fe2++O2+H+
·OH+H2O2→H2O+HO2·
Fe2++HO2·→Fe3++HO2 -
The mechanism of action of OH and organic matter:
RH+·OH→R·+H2O
R·+Fe3+→R++Fe2+
R++O2→ROO+→CO2+H2O
Fe2++O2+2H+→Fe(OH)24Fe(OH)2+O2+2H2O→4Fe(OH)3(colloid)
Fe3++3HO-→Fe(OH)3(colloid)
Under conditions of certain acidity, with Fe existing for colloid form (OH)3With certain cohesion and absorption property, from
And suspended matter and impurity a part of in water can be removed, therefore above-mentioned oxidation processes can play oxidation and two kinds of coagulation effects simultaneously
Fruit.Above-mentioned oxidation processes have many advantages, such as that oxidisability is strong, reaction speed is fast, selectivity is small, equipment is simple, can effectively deal with vulcanization
Object, cyanide, rhodanate, phenolic compound, polycyclc aromatic compound and nitrogenous, oxygen, the heterocyclic organic compounds of sulphur etc..
Further, in S5, the concentration of the ferrous sulfate heptahydrate added is 25%~30%, and dosage is 8~20L/m3
Treatment fluid (i.e. every m3Treatment fluid adds 8~20L ferrous sulfate heptahydrate, similarly hereinafter)；The concentration of the hydrogen peroxide added be 25%~
30%, dosage is 2~8L/m3Treatment fluid；It can get preferable oxidation processes effect.
Further, in S5, oxidation processes are included in oxidation reaction zone and aoxidize and precipitated in oxidation precipitation area,
I.e. above-mentioned oxidation unit 600 includes oxidation reaction zone and oxidation precipitation area, and biochemistry precipitating supernatant reacts it in oxidation reaction zone
Enter oxidation precipitation area afterwards to be separated by solid-liquid separation, guarantees effluent quality.Wherein it is preferred to which biochemical precipitating supernatant is in the oxygen
The change reaction zone residence time is 2~6h, and solution is 1~3h in the oxidation precipitation area residence time after oxidation.
Landfill leachate provided in this embodiment is without membrane treating method, using hydrolysis acidification processing → denitrification-nitrification
Processing → biochemistry precipitating → oxidation processes process flow is efficiently treated through landfill leachate, can be effectively removed diafiltration
(removal rate are up to 95% or more) such as COD, ammonia nitrogen, total nitrogen in liquid can obtain coloration and COD effluent quality all up to standard；
This method does not use membrane module, avoids the cumbersome problem washed film and replace film, and avoid the processing problem of film concentrate.
Above-mentioned landfill leachate is advanced optimized without membrane treating method, such as Fig. 1, the landfill leachate is without embrane method processing side
Method further includes the S0 step carried out before S1, and the S0 step is leachate pretreatment step, including is removed to percolate
Oil processing.Since the fresh leachate of garbage transfer station contains part oil content, microorganism pair can be hindered by being directly entered biochemical unit
The utilization of oxygen, and then degradation of the microorganism to organic matter is influenced, therefore, by carrying out oil removal treatment to percolate, realize oil
Divide and be separated from water, can be reacted for subsequent biochemical and good environment be provided, guarantee the treatment effect of percolate.
Above-mentioned oil removal treatment step can be used the deoiling method of this field routine, in the present embodiment, preferably use air bearing
Oil removing process, deoiling effect are preferable.Generally, oil removal by air bubbling unit 100 includes air bearing reaction zone, contact zone of dissolved air flotation and air bearing point
From area, after landfill leachate enters the reaction of air bearing reaction zone, steam-water mixing is carried out into contact zone of dissolved air flotation, later into air bearing point
Water-oil separating is realized from area.It is further preferred that landfill leachate is 5~10 minutes air bearing reaction zone residence times, in air bearing
The contact zone residence time 5~10 minutes, 20~30 minutes air bearing reaction zone residence times, in oil removal by air bubbling stage CODcrRemoval
Rate is 20%, BOD5Removal rate is that 10%, SS removal rate is 50%.
In the present embodiment, it is preferable that add ferrous sulfate heptahydrate and polyacrylamide to air bearing reaction zone, can effectively mention
High oil removal by air bubbling effect.It is further preferred that the concentration of the ferrous sulfate heptahydrate added is 15%~28%, dosage in S0
For 3~18L/m3Treatment fluid；The concentration of the polyacrylamide added is 0.05%~0.6%, and dosage is 3~15L/m3Processing
Liquid；It can get preferable oil removal by air bubbling effect.
Above-mentioned landfill leachate is advanced optimized without membrane treating method, such as Fig. 1, the sediment of oil removal by air bubbling generation, life
Change the excess sludge that processing generates and the sediment etc. that oxidation processes generate, preferably enters sludge concentration tank and carry out solid-liquid point
From the sludge after concentration is transported outward after dewaterer is dehydrated, and dewaterer can be centrifugal dehydrator or folded spiral shell machine；Sludge concentration tank
Process is reprocessed before supernatant is then back to, and avoids sewage discharge, it is single that preceding process can be denitrification unit 300, nitrification
Member 400, biochemical precipitation unit 500 or oxidation unit 600.Preferably, above-mentioned sludge/sediment etc. stops in sludge concentration tank
Staying the time is 1~2 day, guarantees solid-liquid separation effect.
Embodiment two
Such as Fig. 1, the embodiment of the present invention provides a kind of landfill leachate without embrane method processing system, including along percolate circulation side
To oil removing unit 100, hydrolysis acidification unit 200, denitrification unit 300, de-nitrification unit 400, the biochemical precipitating list being successively connected
Member 500 and oxidation unit 600, oil removing unit 100 is equipped with percolate water inlet pipe, in oxidation unit 600, to the biochemistry being discharged into
Oxidant is added in precipitating supernatant, to obtain qualified discharge liquid.
Wherein, above-mentioned oil removing unit 100 preferably uses oil removal by air bubbling unit 100, and deoiling effect is preferable.
Above-mentioned oil removing unit 100, hydrolysis acidification unit 200, denitrification unit 300, de-nitrification unit 400, biochemical precipitating are single
Member 500 and the structure of oxidation unit 600 can refer to the related content in above-described embodiment one, specifically, comprising:
(1) the oil removal by air bubbling unit 100 includes air bearing reaction zone, contact zone of dissolved air flotation and the dissolved air flotation being sequentially communicated
Area, the percolate water inlet pipe are set on the air bearing reaction zone, and the flotation separation zone is equipped with and the hydrolysis acidification unit
The air bearing water outlets of 200 connections, are additionally provided with the first ferrous sulfate heptahydrate feed pot and polyacrylamide on the air bearing reaction zone
Feed pot.
(2) oxidation unit 600 includes interconnected oxidation reaction zone and oxidation precipitation area, the oxidation reaction zone
Equipped with 600 water inlet of oxidation unit being connected to biochemical precipitation unit 500, the outlet pipe up to standard is set to the oxidation precipitation area
On.
The oxidation reaction zone is equipped with concentrated sulfuric acid feed pot, the second ferrous sulfate heptahydrate feed pot and hydrogen peroxide charging
Tank.
(3) sewage backflow pipe is equipped between the denitrification unit 300 and the de-nitrification unit 400.
(4) landfill leachate further includes sludge dewatering unit 700 without embrane method processing system, the oil removing unit 100
The sludge outlet of sludge outlet, the sludge outlet of biochemical precipitation unit 500 and the oxidation unit 600 with the sludge dewatering
Unit 700 is connected to.
The sludge dewatering unit 700 includes sludge concentration tank and dewaterer, and the sludge concentration tank is equipped in concentration
Purified liquor outlet pipe, the concentrated supernatant outlet are connected to the denitrification unit 300 or the de-nitrification unit 400 or described
Biochemical precipitation unit 500 or the oxidation unit 600.
Other corresponding constructions do not repeat specifically herein.
Advanced optimize structure of the above-mentioned landfill leachate without embrane method processing system, such as Fig. 1, the oil removing unit 100, institute
State hydrolysis acidification unit 200, the denitrification unit 300, the de-nitrification unit 400, the biochemical precipitation unit 500, described
Oxidation unit 600 and the sludge dewatering unit 700 are integrated and connected and are an integral structure.Using integrated integral structure, cloth
Office's compact and reasonable, occupied area is small, to the maximum extent cost saving and operating cost.
It is further preferred that the integral structure is cuboid case structure, the oxidation unit 600 and institute such as Fig. 1
Sludge dewatering unit 700 is stated along the box structure width direction of the cuboid side by side close to being arranged as end segment, the oil removing list
Member 100, the hydrolysis acidification unit 200, the denitrification unit 300, the de-nitrification unit 400, the biochemical precipitation unit
500 are arranged successively with the end segment along the box structure length direction of the cuboid.Based on the structure, each unit is rationally utilized
Design feature, may make the layout of system more compact, further decrease occupied area.
Embodiment three
Above-mentioned landfill leachate is illustrated without membrane treating method and system with specific Application Example below:
For certain small-sized rubbish transfer station percolate, handled using above-mentioned landfill leachate without membrane treating method:
Firstly, landfill leachate stoste enters 100 reaction zone of oil removal by air bubbling unit, ferrous sulfate heptahydrate is added in reaction zone
With PAM (polyacrylamide), ferrous sulfate heptahydrate configuration concentration 20% adds and compares 10L/m3；PAM configuration concentration 0.1%, adds
Compare 10L/m3, react 5 minutes, carry out steam-water mixing into contact zone, enter Disengagement zone later；Oil removal by air bubbling unit 100 always stops
Staying the time is 30 minutes, CODcrRemoval rate is 27.0%, ammonia nitrogen removal frank 19.1%, nitrogen removal rate 25.9%.
Later enter hydrolysis acidification unit 200, the residence time 5 hours, sludge concentration 10mg/L, CODcrRemoval rate is
53%, ammonia nitrogen removal frank 13%, nitrogen removal rate 28%.
From flowing to nitration denitrification unit 300, the residence time 5 days, system dissolved oxygen 4mg/L, return current ratio of the mixed liquid 5:1,
Sludge concentration 20mg/L, CODcrRemoval rate is 96%, ammonia nitrogen removal frank 97%, nitrogen removal rate 94%.
Bio-chemical effluent enters biochemical precipitation unit 500 and is separated by solid-liquid separation, and supernatant enters oxidation unit 600, and sludge returns
It flow to hydrolysis acidification unit 200, the residence time 3 hours, reflux ratio 1:1.
Biochemical 500 supernatant of precipitation unit finally enters 600 reaction zone of oxidation unit, adds the concentrated sulfuric acid, seven in reaction zone
Aqueous ferrous sulfate and hydrogen peroxide；Ferrous sulfate heptahydrate configuration concentration 27.8% adds and compares 15L/m3；Hydrogen peroxide configuration concentration
27.5%, it adds and compares 4L/m3, react 5 hours, be separated by solid-liquid separation into settling zone, the residence time is 2 hours, CODcrRemoval
Rate is 83%, ammonia nitrogen removal frank 33%, nitrogen removal rate 52%.Effluent quality reaches 2 standard of GB16889-2008 table.
Following table can be seen that percolate stoste water quality situation and through each process treated water quality situation:
Example IV
Above-mentioned landfill leachate is illustrated without membrane treating method and system with specific Application Example below:
For certain small-sized rubbish transfer station percolate, handled using above-mentioned landfill leachate without membrane treating method:
Firstly, landfill leachate stoste enters 100 reaction zone of oil removal by air bubbling unit, ferrous sulfate heptahydrate is added in reaction zone
With PAM (polyacrylamide), ferrous sulfate heptahydrate configuration concentration 20% adds and compares 5L/m3；PAM configuration concentration 0.1%, adds
Compare 7L/m3, it reacts 3 minutes, carries out steam-water mixing into contact zone, enter Disengagement zone later, total residence time is 20 minutes,
CODcrRemoval rate is 17.8%, ammonia nitrogen removal frank 14.8%, nitrogen removal rate 21.2%.
Later enter hydrolysis acidification unit 200, the residence time 8 hours, sludge concentration 8mg/L, CODcrRemoval rate is
18.33%, ammonia nitrogen removal frank 9.8%, nitrogen removal rate 15.2%.
From flowing to nitration denitrification unit 300, the residence time 6 days, system dissolved oxygen 3.5mg/L, return current ratio of the mixed liquid 4:
1, sludge concentration 25mg/L, CODcrRemoval rate is 91.7%, ammonia nitrogen removal frank 96.3%, nitrogen removal rate 92.0%.
Bio-chemical effluent enters biochemical precipitation unit 500 and is separated by solid-liquid separation, and supernatant enters oxidation unit 600, and sludge returns
It flow to hydrolysis acidification unit 200, the residence time 2 hours, reflux ratio 2:1.
Biochemical 500 supernatant of precipitation unit finally enters 600 reaction zone of oxidation unit, adds the concentrated sulfuric acid, seven in reaction zone
Aqueous ferrous sulfate and hydrogen peroxide.Ferrous sulfate heptahydrate configuration concentration 27.8% adds and compares 10L/m3；Hydrogen peroxide configuration concentration
27.5%, it adds and compares 3L/m3, react 3 hours, be separated by solid-liquid separation into settling zone, the residence time is 4 hours, CODcrRemoval
Rate is 85.7%, ammonia nitrogen removal frank 26.6%, nitrogen removal rate 28.5%.Effluent quality reaches GB16889-2008 table 2
Standard.
Following table can be seen that percolate stoste water quality situation and through each process treated water quality situation:
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of landfill leachate is without membrane treating method, which comprises the steps of:
Acidification is hydrolyzed to percolate in S1；
S2 carries out denitrification processing to percolate；
S3 carries out nitrification processing to percolate；
S4, the percolate after nitrification processing carry out biochemical precipitation process；
S5, the supernatant that biochemical precipitation process obtains carry out oxidation processes, obtain qualified discharge liquid.
2. landfill leachate as described in claim 1 is without membrane treating method, it is characterised in that: in S5, in biochemistry precipitating
The concentrated sulfuric acid, ferrous sulfate heptahydrate and hydrogen peroxide are added in clear liquid.
3. landfill leachate as claimed in claim 2 is without membrane treating method, it is characterised in that: in S5, the seven water sulphur that add
Sour ferrous concentration is 25%~30%, and dosage is 8~20L/m3Treatment fluid；The concentration of the hydrogen peroxide added be 25%~
30%, dosage is 2~8L/m3Treatment fluid.
4. landfill leachate as claimed any one in claims 1 to 3 is without membrane treating method, it is characterised in that: in S5, oxygen
Change processing is included in oxidation reaction zone and aoxidize and precipitated in oxidation precipitation area, wherein biochemistry precipitating supernatant is in institute
Stating the oxidation reaction zone residence time is 2~6h, and solution is 1~3h in the oxidation precipitation area residence time after oxidation.
5. landfill leachate as described in claim 1 is without membrane treating method, it is characterised in that: further include being carried out before S1
S0 step, the S0 step be to percolate carry out oil removal treatment.
6. landfill leachate as claimed in claim 5 is without membrane treating method, it is characterised in that: in S0, using oil removal by air bubbling
Technique adds ferrous sulfate heptahydrate and polyacrylamide to air bearing reaction zone.
7. landfill leachate as claimed in claim 6 is without membrane treating method, it is characterised in that: in S0, the seven water sulphur that add
Sour ferrous concentration is 15%~28%, and dosage is 3~18L/m3Treatment fluid；The concentration of the polyacrylamide added is
0.05%~0.6%, dosage is 3~15L/m3Treatment fluid.
8. a kind of landfill leachate is without embrane method processing system, it is characterised in that: including what is be successively connected along percolate circulating direction
Oil removing unit, hydrolysis acidification unit, denitrification unit, de-nitrification unit, biochemical precipitation unit and oxidation unit, the oil removing unit
It is equipped with percolate water inlet pipe, in oxidation unit, adds oxidant into the biochemical precipitating supernatant being discharged into, it is up to standard to obtain
Discharge liquid.
9. landfill leachate as claimed in claim 8 is without embrane method processing system, it is characterised in that: further include sludge dewatering list
Member, the sludge outlet of the sludge outlet of the oil removing unit, the sludge outlet of biochemical precipitation unit and the oxidation unit with
The sludge dewatering unit connection.
10. landfill leachate as claimed in claim 9 is without embrane method processing system, it is characterised in that: each unit be integrated and connected for
Integral structure.
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| CN110918598A (en) * | 2019-11-18 | 2020-03-27 | 蒋为民 | Wet garbage zero-emission ecological treatment process |
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