CN102531241A - Method for removing nitrogen and phosphorus from sludge anaerobic acidification liquor - Google Patents
Method for removing nitrogen and phosphorus from sludge anaerobic acidification liquor Download PDFInfo
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- CN102531241A CN102531241A CN2012100664357A CN201210066435A CN102531241A CN 102531241 A CN102531241 A CN 102531241A CN 2012100664357 A CN2012100664357 A CN 2012100664357A CN 201210066435 A CN201210066435 A CN 201210066435A CN 102531241 A CN102531241 A CN 102531241A
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Abstract
The invention belongs to the technical field of environmental protection, in particular to a method for removing nitrogen and phosphorus from a sludge anaerobic acidification liquor. The method comprises the following steps of: regulating the pH value of the acidification liquor to be 10-12 by using diluted NaOH, removing the phosphorus from the acidification liquor through coagulating sedimentation by using chemical reagents, namely CaO and FeCl3 coagulants and a coagulant aid polyacrylamide (PAM), and removing the nitrogen from the acidification liquor by using an ammonia stripping process. The method has a high effect of removing the nitrogen and the phosphorus from the acidification liquor. The acidification liquor treated by the method has high capacity of serving as a denitrification carbon source, and can serve as an additional carbon source for denitrification in sewage treatment plants.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to a kind of the nitrogen phosphorus removal method in the sludge of sewage treatment plants anaerobic acidification liquid.
Background technology
Along with social economy and development of urbanization; Municipal sewage plant's building up in each city and putting into operation just like the mushrooms after rain; By in December, 2011; Built in China becomes and the WWT of operation surpasses more than 3000, and sewage load is 1.36 hundred million tons/day, and the dewatered sludge amount of its generation is about 1.37 ~ 1.7 ten thousand tons of DS (dry solid)/sky.A large amount of mud produces, and has not only strengthened intractability, has also improved disposal costs, and the handling problems of mud is perplexing sewage work more.Therefore how be to need the problem of solution and research focus at present both at home and abroad badly with recycling sludge utilization and disposal.
Constantly discover in recent years; Excess sludge fermentation broth contains abundant short chain fatty acid can become the fine carbon source; Can improve low-carbon high-nitrogen municipal effluent biological denitrificaion efficient, especially at the southern area of China, the sewage work on ground such as Shanghai, Shenzhen; The insufficient situation of carbon source in the ubiquity biological carbon and phosphorous removal process becomes the important factor that suppresses biological carbon and phosphorous removal.Therefore to seek out the ideal denitrification effect, must provide competent carbon source to replenish the requirement of the electron donor of denitrification denitrogenation.According to bibliographical information, reach satisfied denitrification effect, require C/N than reaching certain value, usually 5 ~ 15,, supplementary carbon source therefore in order to improve the Sewage Plant denitrification effect.The most frequently used additional carbon is a methyl alcohol at present, and its cost is higher, has increased the expense of WWT.And a large amount of short chain fatty acids that sludge anaerobic acidification produces are cheap carbon sources of fine quality, so sludge anaerobic acidification is considered to a kind of resource-type sludge disposal mode and receives concern widely.
But not only contain a large amount of dissolved organic matters in the mud alkalescence anaerobic acidification liquid and also contain a large amount of nitrogen phosphorus,, can increase the load of Sewage treatment systems, weaken even can worsen the removal effect of nitrogen phosphorus if directly as supplementary carbon source.Therefore if can the nitrogen phosphorus in the fermented liquid be handled recovery before the acidizing fluid reuse, can reduce the negative impact that fermented liquid brings to WWT as carbon source, can realize the recycling of mud again.
Literature survey through a large amount of shows, the at present domestic method of carrying out effective processing of denitrogenation dephosphorizing to excess sludge alkalescence anaerobic acidification liquid that still lacks.If do not remove nitrogen phosphorus in the sludge anaerobic acidification liquid, can cause the denitrification poor effect, and increase the burden of Sewage treatment systems denitrogenation dephosphorizing directly with the denitrifying carbon source of its reuse as sewage work.What research was more at present is the struvite method, removes nitrogen and phosphorus simultaneously through adding magnesium salts generation magnesium ammonium phosphate sediments such as MgCl2, but tiny deposition, the solid-liquid separation difficulty of being not easy to of its xln causes more difficult mass-producing in the actually operating.
The method of removing nitrogen in the water mainly contains blow-off method, ion exchange method, absorption method, biological process etc.; Wherein the removal effect of ion exchange method and absorption method very easily receives the influence of other material in the water; And pre-treatment is had relatively high expectations, and input cost is higher and the maintenance operation cost is also higher; Though it is lower that biological process is removed the running cost of nitrogen, the shared land area of its treatment facility is bigger, and the cost of disposable input is also higher.Comparatively speaking, the blow-off method floor space is little, cost is low, and the effect of removal nitrogen is better.
Remove the nutritive substance phosphorus (P) in the waste water, main treatment process comprises: chemical method and biological process.Chemical method is a kind of phosphorus removing method that adopts the earliest, and it can be that carry out on the basis with insoluble throw outs of reaction generation such as some chemical substance such as aluminium salt, molysite, lime with phosphoric acid salt.Biological process be utilize mikrobe under aerobic condition to sewage in the excessive sorption of soluble phosphate, precipitate and separate and dephosphorization then, but the phosphorus in the mud very easily under anaerobic discharges.The characteristics of chemical method are that the clearance of phosphorus is higher, and result is stable, mud handle and disposal process in releases phosphorus and cause secondary pollution again not, but the rate ratio of mud is bigger.
Summary of the invention
The objective of the invention is to propose a kind of method of removing nitrogen phosphorus in the sludge anaerobic acidification liquid efficiently, to the negative impact of sewage, improve the application of acidizing fluid as denitrifying carbon source with the concentration that reduces nitrogen phosphorus in the acidizing fluid and high concentration of nitrogen and phosphorus.
The method of nitrogen phosphorus in the removal sludge anaerobic acidification liquid that the present invention proposes adopts the method for pH regulator, coagulating sedimentation, ammonia stripping to handle the nitrogen phosphorus in the sludge anaerobic acidification liquid.At first in the first pH regulator pond, add NaOH solution (mass concentration is 30%) and regulate the pH value, make the pH value of sludge anaerobic acidification liquid rise to 10 ~ 12, stir 10 ~ 30min and make its abundant mixing.Then acidizing fluid flows into coagulative precipitation tank, in coagulative precipitation tank, add earlier in CaO and the acidizing fluid phosphorus react and generate calcium phosphate precipitation with removal phosphorus; Then add FeCl
3, stir the back fast and add coagulant aids PAM 0.5 ~ 1 mg/L.Leave standstill 45 ~ 60min, a large amount of flcos is deposited to the settling tank bottom under action of gravity.In coagulative precipitation tank, the removal phosphorus of total phosphorus is up to more than 95%, and total nitrogen is removed about 30%, and the clearance of COD is 15% in the acidizing fluid.Supernatant in the settling tank gets into the second pH regulator pond; Add NaOH and regulate pH value to 10 ~ 12; Mix, get into stripping tower then and carry out stripping removal ammonia, gas-liquid volume ratio is 2000 ~ 6000; To remove the nitrogen in the acidizing fluid, the acidizing fluid behind stripping is directly collected to be used for the denitrifying carbon source of sewage work.
Technical process of the present invention is as shown in Figure 1, and concrete steps are following:
(1) in the first pH regulator pond, adds NaOH,, make the pH value of sludge anaerobic acidification liquid rise to 10 ~ 12, stir 10 ~ 30min, make its abundant mixing to regulate the pH value;
(2) add CaO, with in the acidizing fluid phosphorus react the generation calcium phosphate precipitation, to remove phosphorus, the dosage of CaO is equivalent to 1.6 ~ 2 times (volumetric molar concentrations) of total phosphorus concentration, middling speed (150 ~ 200 r/min) stirs, the time is 10 ~ 20min; Then add FeCl
3, dosage is 70 ~ 100 mg/L, (300 ~ 500r/min) 1 ~ 3min are so that FeCl in stirring fast
3Form throw out; Then add coagulant aids PAM (SEPIGEL 305) 0.5 ~ 1 mg/L, stir (50 ~ 70 r/min) 15 ~ 30min at a slow speed, to guarantee the formation of macrobead flco.Leave standstill 45 ~ 60min, a large amount of flcos is deposited to the settling tank bottom under action of gravity.In coagulative precipitation tank, the removal phosphorus of total phosphorus is up to more than 95%, and total nitrogen is removed about 30%, and the clearance of COD is 15% in the acidizing fluid;
(3) the acidizing fluid supernatant after the dephosphorization gets into the 2nd pH value equalizing tank, adds NaOH, regulates pH value to 10 ~ 12, and thorough mixing is even;
(4) follow the top that acidizing fluid gets into reverse-flow Ammonia blowing-out tower; Be showered into filler from top and form water droplet; Gap along filler falls one after another, contact the completion mass transfer process with the air inversion that is blasted from Ammonia blowing-out tower bottom by blower fan; Make ammonia transfer gas phase to, thereby thoroughly remove the ammonia nitrogen in the acidizing fluid by liquid phase; Acidizing fluid behind stripping is directly collected the denitrifying carbon source that is used for sewage work.The gas-liquid volume ratio of Ammonia blowing-out tower is 2000 ~ 6000, and the thickness of packing layer is 2 ~ 5m, and filler is a Raschig ring, and the stripping time is 30 ~ 120min;
(5) ammonia that is gone out by stripping is disposed to air in the ammonia absorption equipment that contains dilute sulphuric acid, to prevent that environment is produced secondary pollution.
Through measuring; In the acidizing fluid water outlet, the concentration of total nitrogen, total phosphorus is respectively less than 15mg/L and 5mg/L, and the concentration of COD is more than 5000mg/L; The ratio of COD/TN is greater than 200; Far above 15, explain that acidizing fluid has the higher ability as denitrifying carbon source, can be used as the additional carbon of sewage work's denitrogenation.
Among the present invention, when the suspended particulate in the acidizing fluid is too much, need to increase the residence time of acidizing fluid at storage pool.
The invention has the advantages that: adopt the method for pH regulator+coagulating sedimentation+ammonia stripping to remove the nitrogen phosphorus in the sludge anaerobic acidification liquid; Make the mud acidizing fluid have higher potentiality, and reduced the negative impact of acidizing fluid to greatest extent Sewage treatment systems as denitrifying carbon source.Adopt CaO chemical precipitation and inorganic coagulant, it is with low cost, and sedimentation effect is better, to the accommodation broad of temperature, basicity and the organic content of acidizing fluid, and with coagulant aids PAM to be used effect better.Adopt Ammonia blowing-out tower technology can remove the nitrogen in the acidizing fluid efficiently, the ammonia nitrogen that stripping goes out is absorbed by the absorption equipment that contains dilute sulphuric acid, can not produce secondary pollution to environment.
Description of drawings
Fig. 1 is a schema of the present invention.
Embodiment
Embodiment 1:
Take from the excess sludge of certain sewage work of south; Behind anaerobically fermenting, get its supernatant; Acidizing fluid at first gets into storage pool and regulates and stablize; Get into a pH value equalizing tank then, in the first pH regulator pond, add 30% NaOH and regulate about pH value to 11, stir and make its thorough mixing.Get into coagulative precipitation tank then, add the CaO that volumetric molar concentration is equivalent to 1.6 times of total phosphorus concentrations earlier, middling speed (150r/min) is mixed 10min and is carried out the chemical precipitation reaction; Then add FeCl
370mg/L stirs (300r/min) 1min fast, then adds coagulant aids PAM0.5mg/L, stirs (60r/min) 15min at a slow speed, leaves standstill 45min then and precipitates.The supernatant of post precipitation gets into the 2nd pH value equalizing tank, adds NaOH and regulates about its pH value to 11, flows into Ammonia blowing-out tower then, and the vapour-liquid ratio of regulating Ammonia blowing-out tower is 3000, and the stripping time is 120min.
The concentration of SCOD in the assay determination acidizing fluid, TN, TP, NH3-N and SOP.
Can draw as drawing a conclusion through experimental study: under the acidizing fluid starting condition, the concentration of each index is: SCOD is 6690mg/L, and the concentration of NH3-N is 329mg/L, and TN is 422mg/L, and SOP is 144.2mg/L, and TP is 159.5mg/L; The concentration of each index is in the acidizing fluid after this method is handled: SCOD is 5530mg/L, NH
3-N 15mg/L, TN25mg/L, SOP 3.5mg/L, TP 5mg/L, the clearance of nitrogen phosphorus is respectively 95%, 97.5%.This method has higher removal usefulness to N, the P in the acidizing fluid of mud alkalescence anaerobic acidification.C/N ratio and the carbon-phosphorus ratio of handling the back acidizing fluid simultaneously are respectively 221.2,1106; Therefore this acidizing fluid is suitable as the additional carbon of sewage work's denitrogenation.
Embodiment 2:
Take from the dewatered sludge of certain sewage work; Behind anaerobically fermenting, get its supernatant, acidizing fluid at first gets into storage pool and regulates and stablize, and gets into a pH value equalizing tank then; In the first pH regulator pond, add 30% NaOH and regulate about pH value to 11, stir and make its thorough mixing.Get into coagulative precipitation tank then, add the CaO that volumetric molar concentration is equivalent to 2 times of total phosphorus concentrations earlier, middling speed (200r/min) is mixed 15min and is carried out the chemical precipitation reaction; Then add FeCl
3100mg/L stirs (500r/min) 3min fast, then adds coagulant aids PAM1mg/L, stirs (60r/min) 30min at a slow speed, leaves standstill 60min then and precipitates.The supernatant of post precipitation flows into the 2nd pH value equalizing tank, regulates about pH to 11, gets into Ammonia blowing-out tower then, and the vapour-liquid ratio of regulating Ammonia blowing-out tower is 4500, and the stripping time is 100min.
The concentration of SCOD in the assay determination acidizing fluid, TN, TP, NH3-N and SOP.
Can draw as drawing a conclusion through experimental study: under the acidizing fluid starting condition, acidizing fluid water quality parameter SCOD
Cr7210 mg/L, NH
3-N 440mg/L, T-N 492 mg/L, SOP 111.9 mg/L, TP 129.5 mg/L.Handle the NH of back acidizing fluid
3Content is less than 10mg/L, and clearance reaches more than 95%; TN content is more than 90% for the 17mg/L clearance; SOP 3mg/LT-P 5mg/L; COD content 5211mg/L.C/N ratio and carbon-phosphorus ratio are respectively 659,1042, so this acidizing fluid is suitable as the additional carbon of sewage work's denitrogenation.
Claims (2)
1. method of removing nitrogen phosphorus in the sludge anaerobic acidification liquid is characterized in that concrete steps are following:
(1) in the first pH regulator pond, adds NaOH,, make the pH value of sludge anaerobic acidification liquid rise to 10 ~ 12, stir 10 ~ 30min, make its abundant mixing to regulate the pH value;
(2) add CaO, with in the acidizing fluid phosphorus react the generation calcium phosphate precipitation, to remove phosphorus, the dosage of CaO is equivalent to 1.6 ~ 2 times of total phosphorus volumetric molar concentration, middling speed stirs: 150 ~ 200 r/min, the time is 10 ~ 20min; Then add FeCl
3, dosage is 70 ~ 100 mg/L, stir fast: 300 ~ 500r/min, the time is 1 ~ 3min, makes FeCl
3Form throw out; Then add coagulant aids SEPIGEL 305 0.5 ~ 1 mg/L, stir at a slow speed: 50 ~ 70 r/min, the time is 15 ~ 30min, to guarantee the formation of macrobead flco; Leave standstill 45 ~ 60min then, make a large amount of flcos under action of gravity, be deposited to the settling tank bottom;
(3) the acidizing fluid supernatant after the dephosphorization gets into the 2nd pH value equalizing tank, adds NaOH, regulates pH value to 10 ~ 12, and thorough mixing is even;
(4) follow the top that acidizing fluid gets into reverse-flow Ammonia blowing-out tower; Be showered into filler from top and form water droplet; Gap along filler falls one after another, contact the completion mass transfer process with the air inversion that is blasted from Ammonia blowing-out tower bottom by blower fan; Make ammonia transfer gas phase to, thereby thoroughly remove the ammonia nitrogen in the acidizing fluid by liquid phase; Acidizing fluid behind stripping is directly collected the denitrifying carbon source that is used for sewage work; The gas-liquid volume ratio of Ammonia blowing-out tower is 2000 ~ 6000, and the thickness of packing layer is 2 ~ 5m, and filler is a Raschig ring, and the stripping time is 30 ~ 120min;
(5) ammonia that is gone out by stripping is disposed in the ammonia absorption equipment that contains dilute sulphuric acid with air.
2. the method for the nitrogen phosphorus in the removal mud acidizing fluid according to claim 1 is characterized in that: when the suspended particulate in the acidizing fluid is too much, need to increase the residence time of acidizing fluid at storage pool.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103449628A (en) * | 2013-08-05 | 2013-12-18 | 上海电力学院 | Method for removing phosphorus in concentred and dewatered sludge water by virtue of deeply-dewatered sludge water |
| CN106746391A (en) * | 2016-11-16 | 2017-05-31 | 环境保护部南京环境科学研究所 | A kind of phosphatization recycling sludge method of disposal |
| CN108947118A (en) * | 2018-07-16 | 2018-12-07 | 江南大学 | A kind of method of citric acid fermentation utilization of wastewater resource |
| CN111302586A (en) * | 2020-02-05 | 2020-06-19 | 哈尔滨工业大学 | Treatment method for recycling domestic sludge of sewage plant |
| CN112961770A (en) * | 2021-04-09 | 2021-06-15 | 无锡马盛环境能源科技有限公司 | System and method for preparing organic acid/organic acid salt from kitchen garbage |
| CN113150969A (en) * | 2021-04-09 | 2021-07-23 | 无锡马盛环境能源科技有限公司 | System and method for producing acid by kitchen waste alkaline |
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| WO2009105766A2 (en) * | 2008-02-22 | 2009-08-27 | Water Solutions, Inc. | Process for treating effluent liquid fraction from post anaerobic digestion |
| CN101962220A (en) * | 2010-07-30 | 2011-02-02 | 南京林业大学 | Biological denitrification method of sewage with low carbon-nitrogen ratio and special device thereof |
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Patent Citations (4)
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| CN101070217A (en) * | 2007-06-14 | 2007-11-14 | 同济大学 | Method for increasing sewage-reinforced biological phosphor-removing effect by resource utilizing mud organic substance |
| WO2009105766A2 (en) * | 2008-02-22 | 2009-08-27 | Water Solutions, Inc. | Process for treating effluent liquid fraction from post anaerobic digestion |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103449628A (en) * | 2013-08-05 | 2013-12-18 | 上海电力学院 | Method for removing phosphorus in concentred and dewatered sludge water by virtue of deeply-dewatered sludge water |
| CN103449628B (en) * | 2013-08-05 | 2015-09-30 | 上海电力学院 | Deep dehydration sludge water is utilized to remove the method for phosphorus in thickening sludge water |
| CN106746391A (en) * | 2016-11-16 | 2017-05-31 | 环境保护部南京环境科学研究所 | A kind of phosphatization recycling sludge method of disposal |
| CN108947118A (en) * | 2018-07-16 | 2018-12-07 | 江南大学 | A kind of method of citric acid fermentation utilization of wastewater resource |
| CN111302586A (en) * | 2020-02-05 | 2020-06-19 | 哈尔滨工业大学 | Treatment method for recycling domestic sludge of sewage plant |
| CN112961770A (en) * | 2021-04-09 | 2021-06-15 | 无锡马盛环境能源科技有限公司 | System and method for preparing organic acid/organic acid salt from kitchen garbage |
| CN113150969A (en) * | 2021-04-09 | 2021-07-23 | 无锡马盛环境能源科技有限公司 | System and method for producing acid by kitchen waste alkaline |
| CN112961770B (en) * | 2021-04-09 | 2024-04-16 | 江苏马盛生物科技股份有限公司 | System and method for preparing organic acid/organic acid salt from kitchen waste |
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