CN105693067A - Method for preparing sediment covering material by sludge recycling of water treatment plant - Google Patents
Method for preparing sediment covering material by sludge recycling of water treatment plant Download PDFInfo
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- CN105693067A CN105693067A CN201610200212.3A CN201610200212A CN105693067A CN 105693067 A CN105693067 A CN 105693067A CN 201610200212 A CN201610200212 A CN 201610200212A CN 105693067 A CN105693067 A CN 105693067A
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- sludge
- ammonia nitrogen
- mud
- water
- mud granule
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- 239000010802 sludge Substances 0.000 title claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000000463 material Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000013049 sediment Substances 0.000 title abstract description 9
- 238000004064 recycling Methods 0.000 title abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000001354 calcination Methods 0.000 claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 238000012851 eutrophication Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 4
- 239000008187 granular material Substances 0.000 claims description 75
- 238000000746 purification Methods 0.000 claims description 48
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 26
- 229910052698 phosphorus Inorganic materials 0.000 claims description 25
- 239000011574 phosphorus Substances 0.000 claims description 25
- 238000005253 cladding Methods 0.000 claims description 8
- 238000004137 mechanical activation Methods 0.000 claims description 4
- 230000009514 concussion Effects 0.000 claims description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 69
- 239000002699 waste material Substances 0.000 abstract description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 abstract 1
- 230000010358 mechanical oscillation Effects 0.000 abstract 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 56
- 229910019142 PO4 Inorganic materials 0.000 description 21
- 230000000694 effects Effects 0.000 description 21
- 239000010452 phosphate Substances 0.000 description 21
- 230000008859 change Effects 0.000 description 19
- 238000001179 sorption measurement Methods 0.000 description 19
- 238000012360 testing method Methods 0.000 description 18
- 238000010521 absorption reaction Methods 0.000 description 17
- 238000002360 preparation method Methods 0.000 description 13
- 230000009467 reduction Effects 0.000 description 12
- 229910021536 Zeolite Inorganic materials 0.000 description 11
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 11
- 239000010457 zeolite Substances 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000003403 water pollutant Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000011149 active material Substances 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 150000002505 iron Chemical class 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008239 natural water Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical class O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003578 releasing effect Effects 0.000 description 1
- -1 salt modified zeolite Chemical class 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Abstract
The invention discloses a method for preparing a sediment covering material by sludge recycling of a water treatment plant. The method comprises the following steps: (1) collecting sludge of the water treatment plant to prepare sludge cake; (2) calcining the sludge cake at 380-450 DEG C for 3.5-4.5 hours to prepare sludge briquettes; and (3) screening the sludge briquettes by mechanical grinding and mechanical oscillation to prepare sludge particles having sizes of 1-3.2mm, namely the sediment covering material. According to the method, the problem that sludge of the water treatment plant releases nitrogen and organic matters can be solved, the prepared sludge particle covering material can be used for effectively controlling release of phosphorous in the sediment and controlling release of partial nitrogen in the sediment, so that eutrophication of a water body can be controlled, and ammonia nitrogen and organic matters are not released to the water body; and meanwhile, a new way is provided to the sludge recycling of the water treatment plant, and the aim of changing waste into valuable is truly realized.
Description
Technical field
The invention belongs to recycling sludge processing technology field, be specifically related to a kind of purification plant sludge resource and prepare the method that bed mud covers material。
Background technology
Body eutrophication is one of important problem of facing of world today's water prevention and cure of pollution。Along with the development of China's industrialization and urbanization, body eutrophication tends to serious。Nitrogen and phosphorus are the main limiting factor of body eutrophication, and wherein phosphorus is generally considered the critical limitation factor, cut down water systems'phosphorus concentration and can effectively suppress body eutrophication。Bed mud is water systems'phosphorus " source " and " remittance ", and sedimentary phosphate release is one of water systems'phosphorus main source。Therefore, when external source phosphorus is effectively controlled, cutting down sedimentary phosphate release is control one of body eutrophication measure。
The major measure cutting down sedimentary phosphate release at present has desilting method and original position cladding process。Original position cladding process is the focus of the outer scholar's research of Now Domestic, especially quickly grows in Europe, the U.S., Japan, obtains practical engineering application widely。Covering material is original position soverlay technique core, its type quickly grows, currently, the covering material of common reduction sedimentary phosphate release has: calcite, inorganic salt modification zeolite, organic salt modified zeolite, modified zirconia zeolite, lanthanum modified alta-mud are (also known as lock phosphorus agent), the phosphor passivation agent (Z2G1) etc. of Zeolite modifying, above-mentioned most of active materials costly and on a large scale prepare difficulty, therefore, seek exploiting economy, the effective material that covers is necessary。
Along with the quickening of China's industrialization and urbanization process, Urban Water Environment pollution problem increasingly sharpens, inevitable attention water treatment plant's water for drainage slurry and sludge treatment gradually。Water treatment plant's spoil disposal water dehydration technique development comparative maturity, but dehydrated sludge disposes Challenge, at present often by dehydrated sludge cake outward transport landfill, but there is disposal costs height, there is the shortcomings such as secondary pollution, and do not meet " energy-saving and environmental protection, sustainable development " policy of national existing promotion。
Current purification plant sludge recycling main path is to prepare haydite, brick, clinker etc., but due to the impact of the factor such as cost and scale, substantially also in the laboratory research stage, not yet enters the commercial application stage。The floccule that purification plant sludge is mainly in Water treatment iron salt or is formed after aluminum salt flocculant absorption water pollutant, containing compounds such as abundant aluminum or ferrum, there is higher specific surface area, and it is general with positive charge, therefore phosphorus is had fine adsorption effect, visible, it is feasible that purification plant sludge resource system covers material reduction sedimentary phosphate release, but pertinent literature points out that it exists release nitrogen and Organic substance risk in application process, owing to purification plant sludge is mainly based on inorganic matter, organic components content is less, so solving purification plant sludge release nitrogen problem is key point。
Summary of the invention
It is an object of the invention to provide a kind of purification plant sludge resource and prepare the method that bed mud covers material。
The concrete technical scheme of the present invention is as follows:
A kind of purification plant sludge resource prepares the method that bed mud covers material, comprises the steps:
(1) collect purification plant sludge and make sludge cake；Purification plant sludge is mainly based on inorganic matter, organic components content is less, it it is the floccule that in Water treatment, iron salt or aluminum salt flocculant are formed after adsorbing water pollutant, containing compounds such as abundant aluminum or ferrum, there is higher specific surface area, and general with positive charge, it is seen then that phosphorus is had fine adsorption effect。Therefore, purification plant sludge is prepared into bed mud covering material and can effectively control sediment release, thus controlling body eutrophication。Directly mud cake after the dehydration of collection water treatment plant；
(2) by above-mentioned sludge cake temperature lower calcination 3.5～4.5h at 380～450 DEG C, sludge bulking is prepared；
(3) by above-mentioned sludge bulking through mechanical activation comminution and machinery concussion screening, make the mud granule of particle diameter 1～3.2mm, it is described bed mud and covers material, it is 2.5～5.3cm that this bed mud covers material cladding thickness in use, the release of phosphorus and part nitrogen in bed mud can be controlled, and then control the eutrophication of water body。
In a preferred embodiment of the invention, described step (2) is: by the above-mentioned sludge cake temperature lower calcination 4h at 400 DEG C, prepares sludge bulking。
In a preferred embodiment of the invention, the particle diameter of described mud granule is 1～3mm。
In a preferred embodiment of the invention, described bed mud covers material cladding thickness in use is 3～5cm。
The invention has the beneficial effects as follows:
1, the method for the present invention solves purification plant sludge release nitrogen and Organic substance problem well, the mud granule of preparation covers and not only effectively controls sedimentary phosphate release, and control the release of bed mud part nitrogen, thus controlling body eutrophication, and self does not discharge ammonia nitrogen and Organic substance to water body, meanwhile, providing new way for purification plant sludge resource, real realization is turned waste into wealth。
2, the technique of the method for the present invention is simple, with low cost。
3, the method for the present invention adopts method for calcinating, eliminates purification plant sludge and discharges ammonia nitrogen and organic potential hazard to water body, solves purification plant sludge release ammonia nitrogen and Organic substance problem；
4, the particle diameter of the mud granule of the present invention is 1～3.2mm, phosphorus is not only had fine adsorption effect by the mud granule of this size, and, its activity cover layer hydraulic conductivity is moderate, can better be applied to polluted bed mud original position cover in recovery technique (bed mud active layer covers material and removes outside pollutant have good adsorption properties by covering material, it is also contemplated that, active material cover layer hydraulic conductivity, hydraulic conductivity system is excessive, and cover layer mechanical water power retarded capability is little；Hydraulic conductivity is too small, is unfavorable for the active material adsorption effect to pollutant)；
3, it is 2.5～5.3cm that the bed mud that prepared by the method for the present invention covers material cladding thickness in use, belongs to thin layer and covers, and lake, river capacity, the storage water yield and effect on flooding is all little。
Accompanying drawing explanation
Fig. 1-Fig. 2 is the experimental result picture of experimental verification water treatment plant raw sewage Coverage Control sedimentary phosphate releasing effect in the embodiment of the present invention 1, and wherein Fig. 1 is NH in different system overlying water4 +The variation diagram of-N concentration, Fig. 2 is PO in different system overlying water4 3-The variation diagram of-P concentration。
Fig. 3-Fig. 6 is the experimental result picture that in the embodiment of the present invention 2, purification plant sludge calcining optimum condition is determined, wherein Fig. 3 is that ammonia nitrogen absorption amount is changed by purification plant sludge when different calcining heat, Fig. 4 is that purification plant sludge when different calcining heat aligns the change of Phosphate Adsorption amount, ammonia nitrogen absorption amount is changed by the purification plant sludge that Fig. 5 is when different calcination time, and Fig. 5 is that purification plant sludge when different calcination time aligns the change of Phosphate Adsorption amount。
Fig. 7-Figure 12 prepares bed mud to cover the experimental result picture of material absorption ammonia nitrogen and orthophosphate principal element in the embodiment of the present invention 3, wherein Fig. 7 is that ammonia nitrogen absorption amount is changed by the purification plant sludge under condition of different pH, Fig. 8 is that the purification plant sludge under condition of different pH aligns the change of Phosphate Adsorption amount, ammonia nitrogen absorption amount is changed by the purification plant sludge that middle Fig. 9 is when different dosage, Figure 10 is that purification plant sludge when different dosage aligns the change of Phosphate Adsorption amount, ammonia nitrogen absorption amount is changed by the purification plant sludge that middle Figure 11 is when different initial concentration, Figure 12 is that purification plant sludge when different initial concentration aligns the change of Phosphate Adsorption amount。
In Figure 13-Figure 14 respectively embodiment of the present invention 4, whether the mud granule of preparation discharges ammonia nitrogen and organic experiment results figure to water body, wherein Figure 13 is water treatment plant's raw sewage granule and ammonia nitrogen concentration change in the mud granule dipping systems of preparation, Figure 14 is water treatment plant's raw sewage granule and TOC concentration change in the mud granule dipping systems of preparation
Figure 15-Figure 16 respectively embodiment of the present invention 5 is prepared the experiment results figure of mud granule Coverage Control substrate sludge nitrogen Phosphurus release effect, wherein Figure 15 be contradistinction system and preparation mud granule system in the change of ammonia nitrogen concentration, Figure 16 be contradistinction system and preparation mud granule system in the change of total phosphorus concentration。
Detailed description of the invention
In conjunction with accompanying drawing technical scheme it is further detailed below by way of detailed description of the invention and describes。
In accordance with step and the technical essential of the present invention, following embodiment with laboratory water distribution and school district, the Huaqiao University Xiamen former water in eutrophication egression lake and sediments for object of study, carries out laboratory experiment lab scale research respectively。
Embodiment 1 purification plant sludge Coverage Control substrate sludge nitrogen Phosphurus release feasibility study
(1) testing program
Test carries out in 10L, DN200mm wide mouth glass bottle；In each bottle, bed mud weight is about 1.39kg, and thickness is about 5cm。The coverage strength covering material is 2kg/m2(weight is 63g)。Utilizing siphon principle slowly to be added in bottle along bottle wall by lake water by plastic flexible pipe, overlying water volume is about 8L。
Test has 10 vials, is divided into 5 groups, and often group 2 is parallel, is numbered 1-5#, and wherein, 1# is contradistinction system, does not cover any material；2# is husky covering system；3# water treatment plant dirt covering system；4# locks phosphorus agent covering system；5# is zeolite covering system。
Testing and proceed by May 8th, 2015, June 12, end of day, lasted 35d；Glass bottle opening opens wide (not controlling overlying water DO concentration), is placed on indoor, and test at room temperature carries out；Depth of water 10cm place water temperature, pH and DO in timing every day mensuration system；Regularly take 50mL water sample, measure the ammonia nitrogen in water sample, orthophosphate respectively, carry out being supplemented to former graduation mark with former water after water sampling。
Explore purification plant sludge as covering control of material substrate sludge nitrogen Phosphurus release feasibility and existing problems, alternative sand, zeolite and 3 kinds of common bed muds of lock phosphorus agent cover materials and compare with it, study 4 kinds and cover control of material substrate sludge nitrogen Phosphurus release effect, analyze purification plant sludge Coverage Control substrate sludge nitrogen Phosphurus release existing problems and solution route thereof。
(2) test results and analysis
Last in 35d process in test, in each system, water temperature excursion is 24.1～29.9 DEG C, pH excursion is 7.22～7.86, and DO concentration change ranges for 0.19～5.04, and in each system overlying water, the change of ammonia nitrogen and orthophosphate concentration is respectively as depicted in figs. 1 and 2。
As seen from Figure 1, when the coverage strength covering material is 2kg/m2, compared with the control, it is 24.97%～51.40% that zeolite covers ammonia nitrogen reduction rate, and average is 42.04%, illustrates that zeolite covers and can effectively control ammonia nitrogen release in bed mud；Husky cover and lock phosphorus agent covers the average reduction rate of ammonia nitrogen respectively 0.16% and 1.87%, illustrates that thin layer sand covers and in lock phosphorus agent Coverage Control bed mud, ammonia nitrogen release is substantially do not have effect；It is-8.02% that purification plant sludge covers ammonia nitrogen reduction rate, illustrates that purification plant sludge covers and not only can not control sediment release, but also discharges a certain amount of ammonia nitrogen in water body。Variance analysis shows, cutting down ammonia nitrogen effect between zeolite covering system and contradistinction system and have a notable difference (P<0.05), sand, purification plant sludge, between lock phosphorus agent covering system and contradistinction system, reduction ammonia nitrogen effect does not all have notable difference (P>0.05)。
From Figure 2 it can be seen that when the coverage strength covering material is 2kg/m2, compared with the control, it is 30.61%～88.18% that lock phosphorus agent covers orthophosphate reduction rate, and average is 75.98%, illustrates that lock phosphorus agent covers and very well control orthophosphate release in bed mud；It is 23.47%～67.20% that purification plant sludge covers orthophosphate reduction rate, and average is 53.73%, illustrates that purification plant sludge covers and can effectively control orthophosphate release in bed mud；Zeolite covers and husky covers the average reduction rate of orthophosphate respectively 28.09% and 10.69%, illustrates that zeolite covers and in husky Coverage Control bed mud, orthophosphate discharges and has certain effect, but inconspicuous。Variance analysis shows, lock phosphorus agent, cut down orthophosphate effect between purification plant sludge covering system and contradistinction system and all have a notable difference (P<0.05), husky, cut down orthophosphate effect between zeolite covering system and contradistinction system and all there is no notable difference (P>0.05)。
In sum, purification plant sludge exploitation is feasible for covering the release of control of material sedimentary phosphate, but needs to solve it further and discharge ammonia nitrogen problem to water body。
Embodiment 2 purification plant sludge calcining optimum condition is determined
(1) testing program
Air-dry for purification plant sludge cake, mechanical activation comminution and mechanical grading are obtained particle diameter is 1-3mm granule；1. (25 DEG C, 200 DEG C, 400 DEG C, 600 DEG C, 800 DEG C, 1000 DEG C) calcining 3h prepares mud granule at different temperatures respectively；2. when 400 DEG C, condition is calcined the different time (1h, 2h, 3h, 4h, 5h, 6h) respectively and is prepared mud granule；Weigh mud granule 2.0g, put into and fill 200mL, initial concentration is the NH of 30mg/L4In the conical flask of Cl solution or orthophosphate concentration that initial concentration is 2mg/L, at 25 DEG C, under 150r/min, constant temperature water bath vibrates, sampling after reaction 24h, respectively ammonia nitrogen and orthophosphate concentration in test sample, then calculate mud granule to ammonia nitrogen and orthophosphate adsorbance。
According under different calcining heats and different calcination time, mud granule is to ammonia nitrogen and orthophosphate adsorbance size, it is determined that best calcination condition。
(2) test results and analysis
When different calcining heat, ammonia nitrogen and orthophosphate adsorbance are distinguished as shown in Figure 3 and Figure 4 by mud granule；When different calcination time, ammonia nitrogen and orthophosphate adsorbance are distinguished as shown in Figure 5 and Figure 6 by mud granule；
As seen from Figure 3, when calcining heat is 400 DEG C, mud granule is maximum to ammonia nitrogen absorption amount；From fig. 4, it can be seen that when calcining heat is 25 DEG C, 200 DEG C, 400 DEG C, 600 DEG C, it is equally big that mud granule aligns Phosphate Adsorption amount, when super many 600 DEG C of calcining heat, mud granule aligns Phosphate Adsorption amount reduction trend；Therefore, 400 DEG C is optimum calcinating temperature。
As seen from Figure 5, when being 4h between upon calcination, mud granule is maximum to ammonia nitrogen absorption amount。As seen from Figure 6, different calcination times, it is little that mud granule aligns the change of Phosphate Adsorption amount；Therefore, 4h is calcining Best Times。
In sum, the optimum condition of purification plant sludge calcining is: temperature 400 DEG C, time 4h。
Embodiment 3 mud granule Study on influencing factors to ammonia nitrogen and orthophosphate adsorption effect
(1) testing program
By purification plant sludge 400 DEG C, 4h when calcining, obtaining particle diameter by Mechanical Crushing and mechanical grading is the mud granule of 1-3mm；1. investigating pH respectively 5,6,7,8,9 times respectively, mud granule is to ammonia nitrogen and orthophosphate adsorbance；2. investigating under mud granule dosage respectively 2.5g/L, 5g/L, 10g/L, 20g/L, 40g/L respectively, mud granule is to ammonia nitrogen and orthophosphate adsorbance；3. investigating ammonia nitrogen initial concentration respectively is under 5mg/L, 10mg/L, 15mg/L, 20mg/L, 25mg/L, 30mg/L, or orthophosphate initial concentration is when being 0.5mg/L, 1mg/L, 2mg/L, 4mg/L, 8mg/L, mud granule is to ammonia nitrogen and orthophosphate adsorbance；Liquor capacity is 200mL, water temperature 25 DEG C, rotating speed is 150r/min, constant temperature water bath vibration；When investigating pH and when affecting of mud granule dosage, ammonia nitrogen initial concentration is 30mg/L (mud granule dosage is 2g), orthophosphate initial concentration is 2mg/L (mud granule dosage is 0.5g), sampling after reaction 24h, ammonia nitrogen and orthophosphate concentration in test sample respectively, then calculate mud granule to ammonia nitrogen and orthophosphate adsorbance。
Investigate the change of pH, dosage, ammonia nitrogen and orthophosphate initial concentration respectively to the mud granule impact on ammonia nitrogen and orthophosphate adsorbance。
(2) test results and analysis
Under pH respectively 5,6,7,8,9 conditions, ammonia nitrogen absorption amount is changed by mud granule as it is shown in fig. 7, mud granule aligns the change of Phosphate Adsorption amount as shown in Figure 8；When mud granule dosage respectively 2.5g/L, 5g/L, 10g/L, 20g/L, 40g/L, ammonia nitrogen absorption amount is changed by mud granule as it is shown in figure 9, mud granule aligns the change of Phosphate Adsorption amount as shown in Figure 10；When ammonia nitrogen initially dense respectively 5mg/L, 10mg/L, 15mg/L, 20mg/L, 25mg/L, 30mg/L, ammonia nitrogen absorption amount is changed as shown in figure 11 by mud granule；When orthophosphate initially dense respectively 0.5mg/L, 1mg/L, 2mg/L, 4mg/L, 8mg/L, mud granule aligns Phosphate Adsorption amount to be changed as shown in figure 12。
As seen from Figure 7, when pH=7, mud granule is maximum to ammonia nitrogen absorption amount, at pH in 5～7 scopes, increasing with pH value, ammonia nitrogen absorption amount is increased by mud granule, but increase with pH value in 7～9 scopes at pH, ammonia nitrogen absorption amount is reduced by mud granule, but generally speaking, mud granule is little to the change of ammonia nitrogen absorption amount, therefore, in natural water pH scope, the change of pH, mud granule is adsorbed ammonia nitrogen influential effect little。As seen from Figure 8, pH changes within the scope of 5-9, and it is constant that mud granule aligns Phosphate Adsorption amount。
From Fig. 9 and Figure 10, along with the increase of mud granule dosage, the adsorbance of ammonia nitrogen and orthophosphate is all presented the trend gradually decreased by mud granule。Under this experiment condition, ammonia nitrogen maximal absorptive capacity can be reached 3.56mg/g by mud granule, and orthophosphate maximal absorptive capacity can be reached 0.78mg/L。
From Figure 11 and Figure 12, along with the increase of solution ammonia nitrogen or orthophosphate initial concentration, ammonia nitrogen or orthophosphate adsorbance are all presented the trend being gradually increased by mud granule。But when ammonia nitrogen initial concentration is 25mg/L, ammonia nitrogen absorption amount is 20mg/L less than initial concentration by mud granule, concrete reason needs further experiment checking and repeats, and further analyzes。
In sum, in natural water pH excursion, mud granule is adsorbed ammonia nitrogen in pH change and orthophosphate influential effect is little；Along with mud granule dosage increases, ammonia nitrogen and orthophosphate adsorbance are gradually reduced by mud granule, increase along with pollutant initial concentration, pollutant adsorbance is gradually increased by mud granule, visible, in actual applications, it is necessary in conjunction with water pollutant initial concentration and reparation target, it is determined that the cost-effective optimum dosage of mud granule。
Whether the mud granule of embodiment 4 checking preparation discharges ammonia nitrogen and Organic substance to water body
(1) testing program
In 200mL vial, placing 120mL distilled water, respectively prepared by 20g water treatment plant raw sewage granule and 20g mud granule and be placed in vial, often group 3 repeats parallel, is sealed by vial, ammonia nitrogen and TOC concentration in 20d and 40d sampling and testing sample respectively。
Prepare mud granule by bottle dipping experiment checking and whether discharge ammonia nitrogen and Organic substance to water body。
(2) test results and analysis
From Figure 13 and Figure 14, water treatment plant's raw sewage granule is clearly present and discharges ammonia nitrogen and Organic substance to water body, physical particles prepared by the present invention, all greatly reduce to ammonia nitrogen and the Organic substance of water body release, visible, the method for the present invention solves purification plant sludge and discharges ammonia nitrogen and organic problem to water body。
The mud granule Coverage Control substrate sludge nitrogen Phosphurus release effect of embodiment 5 preparation
(1) testing program
Test carries out in 10L, DN200mm wide mouth glass bottle；In each bottle, bed mud weight is about 1.39kg, and thickness is about 5cm。The coverage strength covering material is 1.5kg/m2(weight is 47g)。Utilizing siphon principle slowly to be added in bottle along bottle wall by lake water by plastic flexible pipe, overlying water volume is about 8L。
Test has 4 vials, is divided into 4 groups, and often group 2 is parallel, is numbered 1-2#, and wherein, 1# is contradistinction system, does not cover any material；2# is that sand prepares mud granule covering system。
Testing and within 16th, proceed by December in 2015, January 22 in 2016, end of day, lasted 37d；Test at room temperature carries out；37d water sampling, measures the ammonia nitrogen in water sample, orthophosphate respectively。
The mud granule Coverage Control bed mud ammonia nitrogen of research preparation and the effect of total Phosphurus release, the mud granule of checking preparation covers material feasibility as bed mud。
(2) test results and analysis
Test the change of the ammonia nitrogen in the mud granule covering system lasting 37d, contradistinction system and preparation and total phosphorus concentration respectively as shown in Figure 15 and Figure 16。
As seen from Figure 15, compared with the control, the average reduction rate of ammonia nitrogen is 67.26% by the mud granule of preparation, and the average reduction rate to total phosphorus is 93.25%。Visible, the mud granule of preparation covers and not only effectively controls sedimentary phosphate release, and better controls ammonia nitrogen release。
Those of ordinary skill in the art are it can be seen that when technical scheme changes in following ranges, remain able to obtain same as the previously described embodiments or close technique effect:
A kind of purification plant sludge resource prepares the method that bed mud covers material, comprises the steps:
(1) collect purification plant sludge and make sludge cake；Purification plant sludge is mainly based on inorganic matter, organic components content is less, it it is the floccule that in Water treatment, iron salt or aluminum salt flocculant are formed after adsorbing water pollutant, containing compounds such as abundant aluminum or ferrum, there is higher specific surface area, and general with positive charge, it is seen then that phosphorus is had fine adsorption effect。Therefore, purification plant sludge is prepared into bed mud covering material and can effectively control sediment release, thus controlling body eutrophication。Directly mud cake after the dehydration of collection water treatment plant；
(2) by above-mentioned sludge cake temperature lower calcination 3.5～4.5h at 380～450 DEG C, sludge bulking is prepared；
(3) by above-mentioned sludge bulking through mechanical activation comminution and machinery concussion screening, make the mud granule of particle diameter 1～3.2mm, it is described bed mud and covers material, it is 2.5～5.3cm that this bed mud covers material cladding thickness in use, the release of phosphorus and part nitrogen in bed mud can be controlled, and then control the eutrophication of water body。
The above, be only presently preferred embodiments of the present invention, therefore can not limit scope of the invention process according to this, and the equivalence namely made according to the scope of the claims of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains。
Claims (4)
1. a purification plant sludge resource prepares the method that bed mud covers material, it is characterised in that: comprise the steps:
(1) collect purification plant sludge and make sludge cake；
(2) by above-mentioned sludge cake temperature lower calcination 3.5～4.5h at 380～450 DEG C, sludge bulking is prepared；
(3) by above-mentioned sludge bulking through mechanical activation comminution and machinery concussion screening, make the mud granule of particle diameter 1～3.2mm, it is described bed mud and covers material, it is 2.5～5.3cm that this bed mud covers material cladding thickness in use, the release of phosphorus and part nitrogen in bed mud can be controlled, and then control the eutrophication of water body。
2. the method for claim 1, it is characterised in that: described step (2) is: by the above-mentioned sludge cake temperature lower calcination 4h at 400 DEG C, prepares sludge bulking。
3. the method for claim 1, it is characterised in that: the particle diameter of described mud granule is 1～3mm。
4. the method for claim 1, it is characterised in that: it is 3～5cm that described bed mud covers material cladding thickness in use。
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| CN106277673A (en) * | 2016-08-31 | 2017-01-04 | 中国环境科学研究院 | Preparation method that deposit Endogenous Phosphorus spatial load forecasting bed mud is material modified and application |
| CN106277672A (en) * | 2016-08-31 | 2017-01-04 | 中国环境科学研究院 | A kind of sediment water interface Phosphurus release controls preparation method and the application of material |
| CN107262024A (en) * | 2017-06-07 | 2017-10-20 | 常州市海若纺织品有限公司 | A kind of bed mud lock phosphorus covering material and preparation method thereof |
| CN110152591A (en) * | 2019-06-06 | 2019-08-23 | 华侨大学 | A kind of preparation method of city river polluted bed mud activity cover plate |
| CN110227409A (en) * | 2019-06-10 | 2019-09-13 | 华侨大学 | A kind of method of purification plant sludge preparation magnetic lock phosphorus agent |
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| CN114291986A (en) * | 2021-12-27 | 2022-04-08 | 华侨大学 | Preparation method of active covering plate for synchronously controlling release of nitrogen and phosphorus in sediment |
| CN114656085A (en) * | 2022-04-26 | 2022-06-24 | 中冶华天南京工程技术有限公司 | Algae removal method for water bloom rivers and lakes |
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