CN101244880B - Advanced treatment method for garbage percolate - Google Patents

Advanced treatment method for garbage percolate Download PDF

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CN101244880B
CN101244880B CN2008100245709A CN200810024570A CN101244880B CN 101244880 B CN101244880 B CN 101244880B CN 2008100245709 A CN2008100245709 A CN 2008100245709A CN 200810024570 A CN200810024570 A CN 200810024570A CN 101244880 B CN101244880 B CN 101244880B
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percolate
denitrification
waste water
pond
nitration reaction
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CN101244880A (en
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朱卫兵
李月中
浦燕新
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Welly Environmental Technology Group Co., Ltd.
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Jiangsu Welle Environmental Protection Technology Co Ltd
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Abstract

The invention relates to a deep treatment method of garbage leachate, which comprises the following steps: (1) the garbage leachate, positioned in a denitrification pool, is made to conduct denitrification reaction by continuous push flow; (2) then the garbage leachate in the denitrification pool flowing into a nitrification pool is made to conduct nitrification reaction by continuous jet and blast aeration; DO is controlled from three to five mg/L; (3) the nitrified garbage leachate, flowing into a denitrification pool positioned behind, is made to conduct denitrification reaction by continuous push flow and the addition of carbon source; the concentration (mg/L) ratio of the carbon source and nitrate nitrogen ranges from two point zero to one, to four point five to one; (4) the wastewater after denitrification in the denitrification pool positioned behind is transported into a tubular ultrafilter; then the solid and the liquid of the wastewater are separated by the membrane component of the ultrafilter; clear liquid is transported to a nanofiltration device; concentrated liquid reflows into the denitrification pool; (5) the clear liquid after ultrafiltration is transported to a nanofiltration device; clear water is exported after the clear liquid is filtered by the membrane component of the nanofitration device. The deep treatment method of garbage leachate has an advantage of increasing the removal rate of ammonia nitrogen and total nitrogen.

Description

The method of percolate advanced treatment
Technical field
The present invention relates to a kind of method of percolate advanced treatment, belong to technical field of sewage.
Background technology
Percolate is a kind of high concentrated organic wastewater of complicated component, has the characteristic feature of high-pollution load and comprehensive pollution: stench; Color is darker, and colourity is up to 2000~4000 times; PH about 6~8; About 6000~the 80000mg/L of COD concentration; Biodegradability is very poor, the landfill percolate BOD after stablizing 5/ COD is generally 0.01~0.1; Ammonia nitrogen NH3-N concentration is higher, about 200~3000mg/L; Contain a large amount of soluble solids simultaneously, as sodium, calcium, muriate, vitriol etc., and heavy metals such as a large amount of cadmium, nickel, zinc, copper, chromium, lead, the physico-chemical property fluctuation range is often bigger.Remove COD in the former water of percolate, BOD outside the pollutent index severe overweights such as NH3-N, also has halogenated aryl hydrocarbon, pollutents such as heavy metal and virus.The former water of percolate will be to the local surface water as not dealing carefully with, and groundwater environment causes severe contamination, to the peripheral people's healthy generation serious threat.All the time, city domestic refuse percolation liquid easily causes severe contamination to underground water, surface water and refuse landfill surrounding environment, make surface water anoxic, water quality deterioration, eutrophication, destroy quality of groundwater and make its forfeiture utility value, serious threat tap water and industrial or agricultural water water source become the focus of the common concern of various circles of society.
Present more employing bio-denitrification technology of the technology that removes of ammonia nitrogen in high density and membrane technology.Bio-denitrification technology is that the ammonia nitrogen in the percolate at first is oxidized to NO-X by nitrifier under aerobic condition, and NO-X under anaerobic is reduced to N by denitrifying bacteria then 2Because nitration reaction and anti-nitration reaction both can carry out, and can carry out again, have that oxygen requirement is low, energy consumption is low, load is high, to advantages such as carbon source basicity demand are low and widely by destructor plant in biofilm reactor in activated sludge reactor.But nitrifying process and denitrification process differ greatly to the requirement of envrionment conditions, nitrifying process need take place under the lower aerobic environment of organic concentration, denitrification process then requires anaerobic and has organic envrionment conditions, therefore as earlier nitrated and back denitrification combination treatment method, or as disclosed preceding denitrification of CN1562508A and nitrated combination treatment method, all can handle percolate continuously, but the clearance of total nitrogen only can reach about 80%, the clearance of organic cod reaches 90%, ammonia-N removal rate reaches 99%, can not satisfy processing requirements.
Membrane technology adopts ultrafiltration, nanofiltration and reverse osmosis, but ultrafiltration, nanofiltration and reverse osmosis only are sepn processes, and pollutent is not degraded and effectively removed, and when discharging clear liquid, also has a large amount of concentrated solutions.Because ultrafiltration, nanofiltration and reverse osmosis do not have biological degradation function, low molecule organic matter such as thioether, hydrogen sulfide etc. can make water outlet leave stink in the effluent clear solution simultaneously.
Though biochemical treatment and membrane separation technique combination process are also adopted in the processing of percolate, as adopt the combination process of coagulating, settling tank, membrane bioreactor/nanofiltration system, but ammonia-N removal rate can only reach about 90%, and the clearance of total nitrogen is not high.So present garbage filter liquid processing method is mainly not high to ammonia nitrogen in the percolate and nitrogen removal rate.
Summary of the invention
The purpose of this invention is to provide a kind of method that can improve to the percolate advanced treatment of ammonia nitrogen removal frank in the percolate and nitrogen removal rate.
The present invention is that the technical scheme that achieves the above object is: a kind of method of percolate advanced treatment is characterized in that: carry out according to the following steps,
(1), anti-nitration reaction: percolate is placed in the denitrification pond, and continuous plug-flow carries out anti-nitration reaction to percolate in the denitrification pond;
(2), nitration reaction: the percolate in the denitrification pond flows in the nitrification tank, solid jet, blast aeration in the nitrification tank, DO is controlled at 3-5mg/L, and the waste water of percolate is carried out nitration reaction;
(3), rear-mounted denitrification reaction: the waste water of nitrated back percolate flows in the rear-mounted denitrification pond, continuous plug-flow in the rear-mounted denitrification pond, additional carbon, the concentration of carbon source and nitric nitrogen (mg/L) be than being 2.0~4.5: 1, and the waste water of percolate is carried out anti-nitration reaction;
(4), ultrafiltration: the waste water behind the rear-mounted denitrification is flowed in the tubular type ultra-fine filter, and the membrane module by ultra-fine filter carries out solid-liquid separation to waste water, and clear liquid is sent into the nanofiltration device, and concentrated solution is back in the denitrification pond;
(5), nanofiltration: the clear liquid after the ultrafiltration is sent into the nanofiltration device, after the membrane module of nanofiltration device carries out filtration treatment to clear liquid, export clear water.
The present invention has the following advantages after adopting technique scheme:
1, the present invention adopts denitrification, nitrated and biochemical array mode that rear-mounted denitrification is unique, pollutents such as organism, ammonia nitrogen and total nitrogen in the percolate of effectively degrading.DO is controlled at 3-5mg/L in the nitrification tank of the present invention, adopt the blast aeration of continuous high-efficient jet, the most of organism of energy degraded, especially in rear-mounted denitrification, add carbon source, can adjust the nutritive props in the waste water, make the nitric nitrogen in the active sludge be transformed into nitrogen, the concentrated solution after simultaneously ultra-fine filter being handled is back in the forward denitrification pond, under the carbon source effect in percolate, make the nitric nitrogen in the active sludge in the denitrification pond, further be transformed into nitrogen.Make the organic cod clearance in the percolate reach 98% by this composite reaction, ammonia nitrogen removal frank reaches 99%, nitrogen removal rate is more than 98%, can adapt to the high loading sewage disposal of Various Seasonal, different year percolate concentration, solve the difficult problem that percolate is handled, had important engineering application value.
2, the concentrated solution of the present invention after with ultrafiltration is back in the denitrification pond, realizes activity sludge reflux, kept the stability of active sludge in the biochemical system, owing to replaced the second pond in the traditional technology, stable effluent quality, simple to operate, reduced land area greatly.
3, the present invention adopts ultrafiltration and nanofiltration array mode, ultra-fine filter can be used as the preposition pretreatment process of nanofiltration device, the nanofiltration device is to the further purifying treatment of ultrafiltration clear liquid, the nanofiltration stable effluent quality, nitrogen removal rate reaches more than 98%, the organic cod clearance reaches more than 98%, can directly discharge or as in the water reuse.
Description of drawings
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
Fig. 1 is a schema of the present invention.
Embodiment
See shown in Figure 1ly, the method for percolate advanced treatment of the present invention is carried out according to the following steps,
(1), anti-nitration reaction: percolate is placed in the denitrification pond, continuous plug-flow in the denitrification pond, percolate is carried out anti-nitration reaction, in anaerobic environment nitrate and nitrite by anerobe under the backflow concentrated solution and the carbon source effect in the percolate of ultra-fine filter, being reduced into nitrogen discharges, reach the purpose of biological denitrificaion, liquid level 〉=7 of the percolate in the anti-nitre pond meter, percolate stops after 10-18 hour and flows automatically to nitrification tank.
(2), nitration reaction: percolate flows in the nitrification tank from the denitrification pond, solid jet, blast aeration in the nitrification tank, liquid level 〉=7 of the percolate in the nitrification tank meter, dissolved oxygen DO is controlled at 3-5mg/L in the nitrification tank, pH is at 7-8, sludge concentration is at 15-18g/L, in nitrification tank by highly active aerobic microbiological effect, most of organism of degrading, and make ammonia nitrogen and organonitrogen be oxidized to nitrate and nitrite, percolate is carried out nitration reaction, and the waste water that contains active sludge flows automatically in the rear-mounted denitrification pond, nitrification tank water outlet COD CrConcentration is 300-800mg/L, and ammonia nitrogen concentration is less than 50mg/L.
(3), the rear-mounted denitrification reaction: the waste water of nitrated back percolate flows in the rear-mounted denitrification pond, continuous plug-flow in the denitrification pond, liquid level 〉=7 of percolate in the rearmounted anti-nitre pond, additional carbon, and the concentration of carbon source and nitric nitrogen (mg/L) is than being 2.0~4.5: 1, be preferably in 2.5~3.5: 1, this carbon source adopts glucose or methyl alcohol or ight soil water, or two kinds of mixtures wherein arbitrarily, or three kinds of mixtures, nitrate and nitrite are reduced into nitrogen by anerobe and discharge under the effect of additional carbon in anaerobic environment, and the waste water of percolate is carried out anti-nitration reaction, rear-mounted denitrification water outlet COD CrConcentration is 300-800mg/L, and ammonia nitrogen concentration is less than 10mg/L, and total nitrogen is less than 50mg/L.
(4), ultrafiltration: the waste water behind the rear-mounted denitrification is sent in the tubular type ultra-fine filter, membrane module by ultra-fine filter carries out solid-liquid separation to waste water, the membrane module filter membrane aperture≤30nm of tubular type ultra-fine filter, operating pressure is at 0.4-0.6Mpa in the pipe, clear liquid is sent into the nanofiltration device, concentrated solution is back in the denitrification pond, to keep the balance of activated sludge concentration in the denitrification pond, ultrafiltration water outlet COD CrConcentration is 300-800mg/L, and ammonia nitrogen concentration is less than 10mg/L, and total nitrogen is less than 50mg/L.
(5), nanofiltration: clear liquid after the ultrafiltration is sent into the nanofiltration device, after the membrane module of nanofiltration device carries out the depth type filtration processing to clear liquid, the operating pressure of nanofiltration device is 0.6-1.2Mpa, output water white transparency clear water, the water rate of recovery is at 80-85%, COD is less than 100mg/L in the nanofiltration water outlet, and total nitrogen is less than 20mg/L, and the index of other heavy metal ion and multivalence nonmetallic ion is less than " integrated wastewater discharge standard " (GB8978-1996) primary standard control corresponding requirement.
The treatment process of invention can satisfy the high loading sewage disposal requirement of Various Seasonal, different year percolate concentration, and the data before and after percolate is handled see Table 1.
Table 1
Water-quality guideline CODcr (mg/L) BOD5 (mg/L) NH3-N (mg/L) TN (mg/L) pH
The former water of percolate 5000-65000 3000-30000 1000-3000 1000-2000 6-9
The ultrafiltration clear liquid 300-800 <20 <10 <50 7-8
The nanofiltration clear water <100 <10 <10 <20 7-8
Total clearance >98 >99.5 >99 >98 7-8

Claims (3)

1. the method for a percolate advanced treatment is characterized in that: carries out according to the following steps,
(1), anti-nitration reaction: percolate is placed in the denitrification pond, and in the anti-nitre pond liquid level 〉=7 of percolate meter, and plug-flow continuously in the denitrification pond carries out anti-nitration reaction to percolate, stops and flows automatically to nitrification tank after 10-18 hour;
(2), nitration reaction: the percolate in the denitrification pond flows in the nitrification tank, solid jet, blast aeration in the nitrification tank, dissolved oxygen DO is controlled at 3-5mg/L, waste water to percolate carries out nitration reaction, waste water liquid level 〉=the 7m of percolate in the nitrification tank, pH is at 7-8, and sludge concentration is at 15-18g/L;
(3), rear-mounted denitrification reaction: the waste water of nitrated back percolate flows in the rear-mounted denitrification pond, waste water liquid level 〉=the 7m of percolate in the rearmounted anti-nitre pond, continuous plug-flow in the rear-mounted denitrification pond, additional carbon, carbon source is glucose or methyl alcohol or ight soil water, or the mixture of any two kinds or three kinds, the concentration of carbon source and nitric nitrogen (mg/L) is than being 2.0~4.5: 1, and the waste water of percolate is carried out anti-nitration reaction;
(4), ultrafiltration: the waste water behind the rear-mounted denitrification is flowed in the tubular type ultra-fine filter, and the membrane module by ultra-fine filter carries out solid-liquid separation to waste water, and clear liquid is sent into the nanofiltration device, and concentrated solution is back in the denitrification pond;
(5), nanofiltration: the clear liquid after the ultrafiltration is sent into the nanofiltration device, after the membrane module of nanofiltration device carries out filtration treatment to clear liquid, export clear water.
2. the method for percolate advanced treatment according to claim 1 is characterized in that: the membrane module filter membrane aperture≤30nm of described tubular type ultra-fine filter, the operating pressure of ultra-fine filter is at 0.4-0.6MPa.
3. the method for percolate advanced treatment according to claim 1 is characterized in that: the operating pressure of described nanofiltration device is 0.6~1.2MPa.
CN2008100245709A 2008-03-27 2008-03-27 Advanced treatment method for garbage percolate Active CN101244880B (en)

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Publication number Priority date Publication date Assignee Title
CN101665308B (en) * 2009-09-11 2012-02-01 广州市市政工程设计研究院 Method for advanced treatment of landfill leachate
CN101962248A (en) * 2010-08-18 2011-02-02 苏州英特工业水处理工程有限公司 Treatment method for biological total nitrogen removal
CN102351382B (en) * 2011-09-06 2012-11-07 北京昊业怡生科技有限公司 Combined treatment method of leachate and excrement wastewater
CN102358663A (en) * 2011-09-21 2012-02-22 浙江大学 Low-DO (dissolved oxygen) rear denitrification sewage treatment plant and technique
CN102603128A (en) * 2012-04-05 2012-07-25 光大环保科技发展(北京)有限公司 Method for advanced treatment and recycling of landfill leachate
CN107531530B (en) * 2015-07-07 2021-09-03 洪胜男 Efficient sewage denitrification and dephosphorization process and system
CN105502837A (en) * 2016-01-14 2016-04-20 上海晶宇环境工程股份有限公司 Process and device for conducting deep denitrification on nitrogen-containing organic waste water
CN106277613B (en) * 2016-08-29 2019-07-05 江苏维尔利环保科技股份有限公司 Method for treating garbage percolation liquid
CN109626714B (en) * 2018-12-06 2022-04-05 维尔利环保科技集团股份有限公司 Method for treating landfill leachate nanofiltration concentrate through two-stage reduction membrane filtration
CN110156268A (en) * 2019-06-03 2019-08-23 淄博睿泽环保工程有限公司 A kind of garbage leachate treatment device and technique
CN112979081A (en) * 2021-03-01 2021-06-18 江海职业技术学院 Biological ecological treatment process for denitrification and dephosphorization of domestic sewage

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Inventor after: Zhu Weibing

Inventor after: Li Yuezhong

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Address after: 213025 No. 156 Hanjiang Road, Changzhou City, Jiangsu Province

Patentee after: Welly Environmental Technology Group Co., Ltd.

Address before: 401-403 Innovation Zone, North Zone, hi tech Zone, Changzhou hi tech Zone, Jiangsu 213022

Patentee before: Jiangsu Welle Environmental Protection Technology Co., Ltd.