CN102951745A - Landfill leachate treatment process based on novel ammonia nitrogen removal technology - Google Patents
Landfill leachate treatment process based on novel ammonia nitrogen removal technology Download PDFInfo
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- CN102951745A CN102951745A CN2011104070743A CN201110407074A CN102951745A CN 102951745 A CN102951745 A CN 102951745A CN 2011104070743 A CN2011104070743 A CN 2011104070743A CN 201110407074 A CN201110407074 A CN 201110407074A CN 102951745 A CN102951745 A CN 102951745A
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Abstract
The invention discloses a landfill leachate treatment process based on a novel ammonia nitrogen removal technology. The landfill leachate treatment process comprises the following steps of: firstly, regulating the water quality and the water yield of landfill leachate in a regulating tank; regulating the pH value of water discharged in the former step to over 9, adding a coagulant, mixing the mixture to be uniform, then, enabling the uniformly mixed mixture to enter a settling pond, and carrying out solid-liquid separation in the settling pond; sequentially filtering a clear liquid settled in the former step by an efficient fiber filter and a disc filter to remove macromolecular particle impurities in wastewater; feeding water discharged from the disc filter in the former step into a gas-water separation membrane system to remove ammonia nitrogen, wherein water discharged from the disc filter at one side of a gas-water separation membrane is used as treated water, and water at the other side of the gas-water separation membrane is used as an acidic aquatic solution; keeping the temperature T1 of the treated water larger than or equal to 20 DEG C, the PH1 of the treated water larger than 9 and the pressure P1 at the side of the treated water larger than the pressure P2 at the side of the acidic aquatic solution, and absorbing free ammonia by the acidic aquatic solution to form an ammonium salt solution; and feeding the qualified landfill leachate treated in the former step into a nanofiltration system to remove a chemical oxygen demand.
Description
Technical field
The present invention relates to a kind for the treatment of process of garbage leachate, particularly meet the garbage leachate processing technique that table 2 requires in " household refuse landfill sites pollutes control criterion (GB16889-2008) ".
Background technology
Organic contamination substrate concentration in the garbage leachate is high, ammonia nitrogen concentration is high, the imbalance of C/N ratio, and also contains all kinds of heavy metal contaminants, and colourity is large, strong toxicity, is a kind of high concentrated organic wastewater of pollutant component complexity.The water quality of garbage leachate, water yield fluctuation are greatly, and be relevant with factors such as climate change, temperature variation, rubbish character, landfill time, land-fill method, msw water contents.Because complicacy, uncertainty and the unstable of the contained pollutant component of percolate, so that its intractability sewage that any pollutant component is relatively clear head and shoulders above, relative concentration stable, character is determined relatively.
The treatment process of present domestic garbage leachate is with film system+biochemistry+turn materially main flow; typical process is anaerobism+membrane bioreactor+nanofiltration+reverse osmosis; the subject matter that occurs is: facility investment is high; working cost is high; often shut down because membrane washing is frequent, aquifer yield (processed water) is had a greatly reduced quality.The initial stage operation result of implementing this technique is satisfactory, but As time goes on, and the dense water that finally returns landfill yard is more and more, reaching of having day process the water yield half need to recharge, even membrane module was just changed in the system that has running in 10 months.
Ammonia nitrogen concentration in the percolate increases along with the increase of the garbage loading embeading time limit.
| Ooze drop liquid type | The landfill time | Ammonia nitrogen concentration (mg/L) |
| Initial stage is oozed drop liquid | 0～5 year | 200～2000 |
| Middle and later periods is oozed drop liquid | More than 5～10 years | 500～3000 |
| Ooze drop liquid after the closing | Behind the refuse landfill sealing | 1000～3000 |
When the ammonia nitrogen concentration in the waste water is too high, can affect microbic activity, reduce biological treatment effect, and change of water quality is large, increased the difficulty of biological treatment.Zhao Qing very waits the people to study to find the ammonia nitrogen in the percolate that the activity of active sludge microorganism is had restraining effect, and propose must be with ammonia nitrogen removal below 50mg/L before adopting biological treatment treating refuse percolate.The ammonia nitrogen that the people such as Wang Yanjie study in discovery " middle old-age group " percolate is larger to the toxic effect of anaerobic sludge, and the high density heavy metal is to the difficult recovery of the inhibition of activity of anaerobic sludge.Suggestion should be carried out pre-treatment to reduce it to the toxic action of anaerobion to ammonia nitrogen first before adopting anaerobic technique, avoid simultaneously the water quality big ups and downs to the impact of system for anaerobic treatment.
New standard GB16889-2008 is stricter to index request, and index quantity increases more, especially total nitrogen has been proposed requirement (requiring total nitrogen less than 40mg/L), and this requires treatment process to have stronger denitrification functions, when fluctuation occurs water quality, stronger adaptability can be arranged.The ammonia nitrogen removal of conventional treatment method is limited in one's ability, in order to tackle the fluctuation of ammonia nitrogen concentration, adopt postorder to add reverse osmosis and remove the ammonia nitrogen that exceeds standard, and the adding of reverse osmosis system can make facility investment and ton water consumption that by a relatively large margin raising is arranged undoubtedly.In addition, the aperture of reverse osmosis membrane very little (less than 1nm), the organism of high density or inorganic fall-out sediment easily cause reverse osmosis membrane to pollute or in problems such as film surface scales, cause equipment long-time running poor processing effect.Therefore in the long run consider, it is worthless adopting the reverse-osmosis treated garbage leachate.The graduate Zhai Li new statement of Urban Construction in China, in order to reach the emission request of new standard, the innovation of denitrification process will become a kind of inexorable trend.
Summary of the invention
For the problems referred to above, the objective of the invention is to overcome the deficiency of existing garbage leachate processing technique, remove the ammonia nitrogen technology as the basis take the gas-water separation film, the garbage leachate processing technique that provide that a kind of technique is simple, less investment, running cost are low, meets table 2 emission request among the GB16889-2008.
Technical scheme of the present invention is as follows:
A kind of garbage leachate processing technique based on novel ammonia nitrogen removal technology is characterized in that, comprises the steps:
1) at first in equalizing tank garbage leachate is carried out water quality, water yield adjusting, the purpose that reaches homogeneous and all measure is that subsequent wastewater treatment equipment is created good working conditions;
2) pH value with the previous step water outlet is adjusted to more than 9, adds to enter settling tank after coagulating agent mixes again, and carries out solid-liquid separation in settling tank;
3) clear liquor after the previous step precipitation filters through high-efficiency fiber filter and disc filter successively, removes the macromolecular particle impurity in the waste water;
4) water outlet of previous step disc filter is sent into gas-water separation film system and is removed ammonia nitrogen: a side of gas-water separation film be the water outlet of previous step disc filter as processed water, opposite side is acidic aqueous solution (being absorption liquid); The temperature T of processed water
1〉=20 ℃, the PH of processed water
1＞9, processed water one wall pressure P
1＞acidic aqueous solution one wall pressure P
2, acidic aqueous solution absorbs free ammonia and forms ammonium salt solution, and ammonia nitrogen removal frank is greater than 99%;
5) process qualified garbage leachate through previous step and send into nanofiltration system removal chemical oxygen demand (COD) (COD), fresh water is up to standard (to reach the fresh water that table 2 requires in " household refuse landfill sites pollutes control criterion (GB16889-2008) ", account for 85%) discharging, dense water (accounting for 15%) recharges landfill yard.
PH regulates and the effect of coagulant precipitation is the heavy metal contaminants of removing suspended substance, granule foreign and the overwhelming majority in the waste water.
The principle that the gas-water separation film is removed ammonia nitrogen is: ammonia nitrogen exists dissociation equilibrium in water, and along with PH raises, ammonia nitrogen is at water free ammonia (NH
3) the ratio rising, under certain temperature and pressure, NH
3Gaseous state and liquid two-phase reach balance.According to the chemical balance shifting principle, if change one of condition of equilibrium system, such as concentration, pressure or temperature, balance just moves to the direction that can weaken this change.Principle of work is seen Fig. 1: the side at the gas-water separation film is garbage leachate (feed liquid), and opposite side is acidic aqueous solution (absorption liquid).Temperature T when garbage leachate
1＞20 ℃, PH
1＞9, P
1＞P
2When keeping certain pressure difference, the NH in the garbage leachate
4 +Just become free ammonia NH
3, and surperficial to the gas-water separation film through feed liquid side interfacial diffusion, under the effect of both sides, film surface ammonia partial pressure difference, NH
3Pass through fenestra, enter absorption liquid, and the H in rapid and the acidic solution
+The ammonium salt that reaction generates is nonvolatile, can not counter-diffusion, as follows according to the differential responses equation of absorption liquid:
2NH
3+H
2SO
4＝(NH
4)
2SO
4
NH
3+HNO
3＝NH
4NO
3
The liquid ammonium salt mass concentration that generates is about 25%, utilizes the evaporation of sun power assisted evaporative system to obtain solid-state ammonium salt.Wherein, sun power assisted evaporative system is with the ammonium salt evaporation equipment of sun power as the energy.For example: treating refuse every day liquid 100m
3, ammonia nitrogen average content 2000mg/L forms 3.1 tons of high-quality ammonium salt liquid every day, obtains 0.77 ton of solid-state ammonium salt through pervaporation.
The working pressure of nanofiltration system is low, and product water ratio is high, the qualified discharging of 85% fresh water, and 15% dense water recharges landfill yard.The aperture size of nanofiltration membrane is 5～10 times of aperture size of reverse osmosis membrane, recovers very fast by cleaning after film pollutes, and the phenomenon of flux decrease behind the long-play can not occur.
Compared with prior art, the invention has the beneficial effects as follows: adopt method treating refuse of the present invention to ooze the emission request that the water outlet of drop liquid meets table 2 among the GB16889-2008.(1) utilize the gas-water separation film to remove ammonia nitrogen, ammonia nitrogen removal frank is greater than 99%, and removal speed is fast, and the mineralized nitrogen that is removed is ammonium salt, becomes the industrial raw material of cleaning.Solved the garbage leachate ammonia-nitrogen content high, C/N is than little, and is biochemical difficult, the problem of ammonia nitrogen difficulty up to standard.Gas-water separation film system also can be used for separately carrying of existing refuse landfill treatment facility not up to standard and mark transformation; (2) nanofiltration system is removed COD, and rejection is high, and dense water ratio is little.Compare with reverse osmosis, reduce facility investment, reduce running cost; (3) technique is simple, and the integral device less investment will be saved about 50% than the main flow technique of generally using at present, and running cost is low, and ton water treatment expense can save 40%, and floor space is little.
Description of drawings
Fig. 1 is the schematic diagram that gas-water separation film of the present invention is removed ammonia nitrogen in the garbage leachate; Wherein: T
1, T
2It is the temperature of film two side liquids; P
1, P
2The pressure of film both sides; PH
1, PH
2It is the pH value of film two side liquids.
Fig. 2 is the processing technological flow schematic diagram of garbage leachate of the present invention.
Embodiment
Referring to Fig. 2, a kind of garbage leachate processing technique based on novel ammonia nitrogen removal technology is characterized in that, comprises the steps:
1) at first in equalizing tank garbage leachate is carried out water quality, water yield adjusting, the purpose that reaches homogeneous and all measure is that subsequent wastewater treatment equipment is created good working conditions;
2) pH value with the previous step water outlet is adjusted to more than 9, adds to enter settling tank after coagulating agent mixes again, and carries out solid-liquid separation in settling tank;
3) clear liquor after the previous step precipitation filters through high-efficiency fiber filter and disc filter successively, removes the macromolecular particle impurity in the waste water;
4) water outlet of previous step disc filter is sent into gas-water separation film system and is removed ammonia nitrogen: a side of gas-water separation film be the water outlet of previous step disc filter as processed water, opposite side is acidic aqueous solution (being absorption liquid); The temperature T of processed water
1〉=20 ℃, the PH of processed water
1＞9, processed water one wall pressure P
1＞acidic aqueous solution one wall pressure P
2, acidic aqueous solution absorbs free ammonia and forms ammonium salt solution, and ammonia nitrogen removal frank is greater than 99%;
5) process qualified garbage leachate through previous step and send into nanofiltration system removal chemical oxygen demand (COD) (COD), fresh water is up to standard (to reach the fresh water that table 2 requires in " household refuse landfill sites pollutes control criterion (GB16889-2008) ", account for 85%) discharging, dense water (accounting for 15%) recharges landfill yard.
Described step 2) pH value with the equalizing tank water outlet in is adjusted to 10.5; The pH value of the equalizing tank water outlet described step 2) is to adopt lime or sodium hydroxide to regulate.
What the coagulating agent described step 2) adopted is Tai-Ace S 150, polymerize aluminum chloride, ferrous sulfate, iron trichloride or polyacrylamide.Mixing described step 2) adopts line mixer to finish.Described step 2) mud that the precipitation in obtains burns or centrally disposes after processing with pressure filter.
Described step 3) high-efficiency fiber filter in and the filtering accuracy of disc filter are followed successively by 50～100 microns, 20～50 microns.(filtering accuracy is equivalent to the aperture of the filter material of strainer, is to filter the size that filter allows the largest particle that passes through.)
Described step 4) the gas-water separation film system in is comprised of gas-water separation membrane module, feed liquid pond, sour cuvette, feed pump, sour absorption pump, dosing metering system, Monitoring systems and electrical control system; Garbage leachate carries out ammonia nitrogen removal with the hollow fiber cavity that feed pump is sent into the gas-water separation membrane module by the feed liquid pond, operating pressure 0.05～0.1Mpa, flow 4～7L/min, 20～40 ℃ of temperature, water outlet returns liquid pool, so loop to ammonia nitrogen concentration less than 25mg/L; With sour absorption pump acidic aqueous solution is sent into simultaneously the outside ammonia nitrogen that absorbs of tubular fibre of gas-water separation membrane module by sour cuvette, operating pressure 0.02～0.1MPa, flow 5～8L/min, 20～40 ℃ of temperature, sour cuvette is returned in water outlet, so circulation absorb to ammonia nitrogen concentration less than 25mg/L.
Described step 4) ammonium salt solution that obtains in utilizes the sun power vapo(u)rization system to evaporate, to obtain solid-state ammonium salt.
Described step 5) nanofiltration system is comprised of nanofiltration membrane, pressurized vessel, high-pressure pump and electrical control system in.Described step 5) aperture size of nanofiltration membrane is 1～2nm in.
Embodiment 1:
Get the garbage leachate of Tianjin green light MSW Incineration Plant, analyze through Tianjin Ministry of Geology and Mineral Resources laboratory: former water COD (chemical oxygen demand (COD)) 20200mg/L, BOD (biochemical oxygen demand (BOD)) 2470mg/L, ammonia nitrogen 1430mg/L.20～40 ℃ of equipment inflow temperatures are at first regulated garbage leachate PH to 10.5 with lime, coagulant precipitation, and clear liquor is sent into high-efficiency fiber filter and disc filter with impeller pump 1, and the feed liquid pond is injected in the strainer water outlet, and mud goes to process.Garbage leachate pumps into the gas-water separation membrane module with feed pump 2 by the feed liquid pond, and (the gas-water separation film is the tubular fibre of polypropylene coating tetrafluoroethylene, membrane pore size is 0.2～0.4 μ m) the hollow-fibre membrane inner chamber carry out ammonia nitrogen removal, operating pressure 0.05～0.1MPa, flow 4～7L/min, 20～40 ℃ of temperature, water outlet returns liquid pool, so loop to ammonia nitrogen concentration less than 25mg/L; Using simultaneously sour absorption pump 3 (is absorption liquid with acidic aqueous solution, here be 10% sulfuric acid) sent into the outside ammonia nitrogen that absorbs of tubular fibre of gas-water separation membrane module by sour cuvette, operating pressure 0.02～0.1MPa, flow 5～8L/min, 20～40 ℃ of temperature, sour cuvette is returned in water outlet, so circulation absorb to ammonia nitrogen concentration less than 25mg/L.The ammonia nitrogen concentration of garbage leachate after the gas-water separation film is processed is 15mg/L, and COD is 11800mg/L.The waste liquid that ammonia nitrogen is up to standard is sent into nanofiltration membrane by high-pressure pump 4 again, and operating pressure 1.2～2.0MPa is 13mg/L through the fresh water ammonia nitrogen concentration after the nanofiltration membrane treatment, and COD is 92mg/L, and volume accounts for 85% of former water ratio, qualified discharge, and dense water recharges.
Embodiment 2:
Get the garbage percolation of Tianjin Double opening garbage landfill factory and process, analyze through the laboratory: former water COD 5490mg/L, ammonia nitrogen 931mg/L.20～40 ℃ of equipment inflow temperatures are at first regulated waste liquid PH to 10.5 with lime, coagulant precipitation, and clear liquor is sent into high-efficiency fiber filter and disc filter with impeller pump 5, and the feed liquid pond is injected in the strainer water outlet, and mud goes to process.Garbage leachate is sent into the gas-water separation membrane module with feed pump 6 by the feed liquid pond, and (the gas-water separation film is polypropylene hollow fiber, membrane pore size is 0.2～0.5 micron) the hollow-fibre membrane inner chamber carry out ammonia nitrogen removal, operating pressure 0.05～0.1MPa, flow 4～7L/min, 20～40 ℃ of temperature, water outlet returns liquid pool, so loop to ammonia nitrogen concentration less than 25mg/L; Using simultaneously sour absorption pump 7 (is absorption liquid with acidic aqueous solution, here be 10% sulfuric acid) sent into the outside ammonia nitrogen that absorbs of tubular fibre of gas-water separation membrane module by sour cuvette, operating pressure 0.02～0.1MPa, flow 5～8L/min, 20～40 ℃ of temperature, sour cuvette is returned in water outlet, so circulation absorb to ammonia nitrogen concentration less than 25mg/L.The ammonia nitrogen concentration of garbage leachate after the gas-water separation film is processed is 18mg/L, and COD is 11800mg/L.The waste liquid that ammonia nitrogen is up to standard is sent into nanofiltration membrane by high-pressure pump 8 again, and operating pressure 1.2～2.0MPa is 15mg/L through the fresh water ammonia nitrogen concentration after the nanofiltration membrane treatment, and COD is 83mg/L, and volume accounts for 85% of former water ratio, qualified discharge, and dense water recharges.
Claims (10)
1. the garbage leachate processing technique based on novel ammonia nitrogen removal technology is characterized in that, comprises the steps:
1) at first in equalizing tank garbage leachate is carried out water quality, water yield adjusting, the purpose that reaches homogeneous and all measure is that subsequent wastewater treatment equipment is created good working conditions;
2) pH value with the previous step water outlet is adjusted to more than 9, adds to enter settling tank after coagulating agent mixes again, and carries out solid-liquid separation in settling tank;
3) clear liquor after the previous step precipitation filters through high-efficiency fiber filter and disc filter successively, removes the macromolecular particle impurity in the waste water;
4) water outlet of previous step disc filter is sent into gas-water separation film system and is removed ammonia nitrogen: a side of gas-water separation film be the water outlet of previous step disc filter as processed water, opposite side is acidic aqueous solution; The temperature T of processed water
1〉=20 ℃, the PH of processed water
1＞9, processed water one wall pressure P
1＞acidic aqueous solution one wall pressure P
2
5) process qualified garbage leachate through previous step and send into nanofiltration system removal chemical oxygen demand (COD), the fresh water qualified discharge, dense water recharges landfill yard.
2. the garbage leachate processing technique based on novel ammonia nitrogen removal technology according to claim 1 is characterized in that, the pH value with the equalizing tank water outlet in the described step 2 is adjusted to 10.5; The pH value of the equalizing tank water outlet in the described step 2 adopts lime or sodium hydroxide to regulate.
3. the garbage leachate processing technique based on novel ammonia nitrogen removal technology according to claim 1 is characterized in that, what the coagulating agent in the described step 2 adopted is Tai-Ace S 150, polymerize aluminum chloride, ferrous sulfate, iron trichloride or polyacrylamide.
4. the garbage leachate processing technique based on novel ammonia nitrogen removal technology according to claim 1 is characterized in that, mixing in the described step 2 adopts line mixer to finish.
5. the garbage leachate processing technique based on novel ammonia nitrogen removal technology according to claim 1 is characterized in that, the high-efficiency fiber filter in the described step 3 and the filtering accuracy of disc filter are followed successively by 50～100 microns, 20～50 microns.
6. the garbage leachate processing technique based on novel ammonia nitrogen removal technology according to claim 1, it is characterized in that, mould material in the gas-water separation film system in the described step 4 is polypropylene, tetrafluoroethylene or polypropylene coating tetrafluoroethylene, form is hollow-fibre membrane or flat sheet membrane; Acidic aqueous solution in the described step 4 is 10% sulfuric acid.
7. the garbage leachate processing technique based on novel ammonia nitrogen removal technology according to claim 1, it is characterized in that, the gas-water separation film system in the described step 4 is comprised of gas-water separation membrane module, feed liquid pond, sour cuvette, feed pump, sour absorption pump, dosing metering system, Monitoring systems and electrical control system; Garbage leachate carries out ammonia nitrogen removal with the hollow fiber cavity that feed pump is sent into the gas-water separation membrane module by the feed liquid pond, operating pressure 0.05～0.1MPa, flow 4～7L/min, 20～40 ℃ of temperature, water outlet returns liquid pool, so loop to ammonia nitrogen concentration less than 25mg/L; With sour absorption pump acidic aqueous solution is sent into simultaneously the outside ammonia nitrogen that absorbs of tubular fibre of gas-water separation membrane module by sour cuvette, operating pressure 0.02～0.1MPa, flow 5～8L/min, 20～40 ℃ of temperature, sour cuvette is returned in water outlet, so circulation absorb to ammonia nitrogen concentration less than 25mg/L.
8. the garbage leachate processing technique based on novel ammonia nitrogen removal technology according to claim 1 is characterized in that, the mud that the precipitation in the described step 2 obtains burns or centrally disposes after processing with pressure filter.
9. the garbage leachate processing technique based on novel ammonia nitrogen removal technology according to claim 1 is characterized in that, the ammonium salt solution that obtains in the described step 4 utilizes the sun power vapo(u)rization system to evaporate, to obtain solid-state ammonium salt.
10. the garbage leachate processing technique based on novel ammonia nitrogen removal technology according to claim 1 is characterized in that, nanofiltration system is comprised of nanofiltration membrane, pressurized vessel, high-pressure pump and electrical control system in the described step 5; The aperture size of nanofiltration membrane is 1～2nm in the described step 5.
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| CN103553264A (en) * | 2013-09-06 | 2014-02-05 | 苏州苏净环保工程有限公司 | Multistage-membrane-extraction biological integrated treatment system for processing high ammonia nitrogen in wastewater, and method thereof |
| CN104229968A (en) * | 2014-10-11 | 2014-12-24 | 淮南矿业(集团)有限责任公司 | Chemical waste leachate treatment agent and treatment method |
| CN104925982A (en) * | 2014-03-19 | 2015-09-23 | 成都市华能佳源应用技术研究所 | Ammonia-nitrogen wastewater treatment method |
| CN105130051A (en) * | 2015-08-27 | 2015-12-09 | 上海晶宇环境工程股份有限公司 | Process for treating landfill leachate by using ammonia nitrogen separating membrane and special equipment for process |
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