CN104150686B - A kind of method for treating garbage percolation liquid based on micro-pore aeration ultrafiltration and absorption - Google Patents
A kind of method for treating garbage percolation liquid based on micro-pore aeration ultrafiltration and absorption Download PDFInfo
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- 239000000706 filtrate Substances 0.000 claims abstract description 15
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 12
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 12
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Abstract
The invention provides a kind of method for treating garbage percolation liquid based on micro-pore aeration ultrafiltration and efficient adsorption, comprise the following steps: enter after first percolate being adopted grid filtration in equalizing tank; Then by the effect of aerobic nitrification bacterium, the ammonium oxidation thing in percolate is converted into nitrite or nitrate; In equalizing tank, add denitrifying bacterium again, nitrite or nitrate is reduced to nitrogen and overflows from percolate; The percolate of removing ammonium oxidation thing is injected microporous membrane aeration hyperfiltration membrane assembly, and first the organism in percolate is degraded by mud by waterfall gas by percolate, then carries out solid-liquid separation; Last polymeric adsorbent adsorbs the solute molecule in filtrate, after the Adsorption of solute in filtrate, and the filtrate qualified discharge be disposed.The method effluent quality high-quality stable, excess sludge production is few, and floor space is little, does not limit by place, can effectively remove ammonia nitrogen and hardly degraded organic substance.
Description
Technical field
The invention provides a kind for the treatment of process of percolate, relate to it a kind of based on the treatment process based on micro-pore aeration ultrafiltration and efficient adsorption, belong to refuse disposal system technical field.
Background technology
Along with China city numbers increases and the increasing of population, municipal wastes is also with sharp increase.According to statistics, annual production rubbish reaches 1.5 hundred million tons, and on average with the speed increment in 9%/year, existing 7,000,000,000 tons of wherein untreated rubbish, accounts for 8.3% of China's soil sum.Estimate in 20 years of future, the quantity discharged of solid waste will occupy the land of 85%, and national most area all exists serious refuse pollution problem.
The process of current ripe rubbish mainly adopts burning disposal and landfill disposal.No matter adopt that processing mode, all can have the generation of garbage leachate.
Garbage leachate complicated component, containing multiple pollutant matter, the component of domestic garbage treatment plant Leachate site and concentration depend primarily on area standard of living and custom, rubbish the factor such as the residence time, climate condition, be a kind of organic waste water of high density.If do not dealt carefully with, garbage leachate causes serious pollution by environment.And because the water quality of garbage leachate and the water yield change greatly, bringing difficulty to the selection for the treatment of process and operation, is the waste water that a kind of intractability is larger.
According to China take refuse treatment " three change " principle, in succession there is large quantities of destructor plants.The processing mode of rubbish mainly contains compost, landfill and burning three kinds, and wherein landfill is the main processing ways of China.The water quality of the percolate that garbage loading embeading produces is complicated, not only can produce serious pollution to water body, can produce various objectionable impurities harm humans simultaneously.For the harm of percolate to the mankind and environment, the secondary pollution caused to prevent consumer waste filling and embedding, the percolate emission standard that every country is formulated respectively for national conditions, with solving percolate emission problem.
Percolate refers to that rubbish is in landfill stacking process, due to anaerobically fermenting, organic substance decomposing, precipitation leaching and wash away, the reason such as surface water and groundwater must soak, produce multiple metabolic substd and moisture, define the liquid containing high concentration suspended matter and high density organic or inorganic composition, the main source of percolate is: natural precipitation in (1) landfill yard; (2) rubbish itself is moisture; (3) microbiological anaerobic water of decomposition.The moiety more complicated of percolate, according to the difference of landfill time, the content of the various material of percolate also has larger difference.
The technology for the treatment of refuse percolate main at present is mainly divided into three broad aspect: physical chemistry treatment technology, biologic treating technique and land treatment technique.
Materializing strategy technology is not by the impact of water quality and quantity, and running and comparing is reliable, stable water outlet.Percolate for biochemical difference also has good treatment effect, be used to process percolate from the middle and later periods nineties and commonly use one for the treatment of technology, in view of 2008 promulgate new emission standard, general bioremediation is difficult to reach emission request, so be very necessary with physico-chemical process as the pre-treatment of biology or follow-up advanced treatment.
The physico-chemical process of current treating refuse percolate mainly contains light electrolysis, coagulating sedimentation, stripping, absorption (charcoal absorption), membrane sepn (reverse osmosis, ultrafiltration), chemical oxidization method (ozone oxidation, electrolytic oxidation, Fenton reagent oxidation etc.).Membrane separation technique is contemporary more advanced physical processing techniques, and eighties of last century is developed in China the nineties, and is widely used in recent years and studied.Film can be divided into microfiltration membrane (MF), ultra-filtration membrane (UF), nanofiltration membrane (NF), reverse osmosis membrane (RO) and electrodialytic membranes (EI) by the aperture according to film.In landfill leachate treatment, mainly ultrafiltration (UF) and reverse osmosis (RO) Application comparison many, especially reverse osmosis technology energy effectively catching dissolved matter, stable, safety, being widely used in reality.But running cost is higher in operational process, operate cumbersome, mainly require high at Process of Chemical Cleaning, the dense water yield that nanofiltration and reverse osmosis have generation is comparatively large, the shortcoming that the rate of recovery is low.
Summary of the invention
The invention provides a kind of method for treating garbage percolation liquid based on micro-pore aeration ultrafiltration and efficient adsorption, the method effluent quality high-quality stable, excess sludge production is few, and floor space is little, does not limit by place, can effectively remove ammonia nitrogen and hardly degraded organic substance.
Realizing the technical scheme that above-mentioned purpose of the present invention adopts is:
Based on a method for treating garbage percolation liquid for micro-pore aeration ultrafiltration and efficient adsorption, comprise the following steps: (1), percolate is adopted grid filtration after enter in equalizing tank;
(2), by percolate inject microporous membrane aeration hyperfiltration membrane assembly, described microporous membrane aeration hyperfiltration membrane assembly entirety is in tubular, and its outside is membrane module, and its top is provided with water-in and pressurized gas entrance, is provided with aeration head and Butterworth Hatch bottom it; Percolate enters in membrane module by water-in, first organism in percolate is degraded by mud by aeration by percolate, then percolate is under the ordering about of pressurized gas, wherein micromolecular material leaches from ultra-filtration membrane, form filtrate and enter in resin column, macromolecular material is then stayed in membrane module;
(3), the polymeric adsorbent that arranges in resin column adsorbs the solute molecule in filtrate, after the Adsorption of solute in filtrate, and the filtrate qualified discharge be disposed.
Removing ammonium oxidation thing is needed after completing steps (1), concrete steps are: first the pH value of percolate is adjusted to 7.8 ~ 8.9, temperature is adjusted to 20 DEG C ~ 40 DEG C, under excess oxygen, in equalizing tank, add aerobic nitrification bacterium, by the effect of aerobic nitrification bacterium, the ammonium oxidation thing in percolate is converted into nitrite or nitrate; Then the pH value of percolate is adjusted to 6.5 ~ 8.0, temperature is adjusted to 20 DEG C ~ 40 DEG C, under anoxic conditions, denitrifying bacterium is added in equalizing tank, nitrite or nitrate is reduced to nitrogen and overflows from percolate, thus removing ammonium oxidation thing, clearance can reach 70% ~ 95%.
In step (2), when accumulation in membrane module has more organism, wash-down water is injected by the Butterworth Hatch below membrane module, and aeration head is connected with pressurized air, wash-down water and pressurized air make the organism be attached on membrane module inwall peel off jointly, and be rinsed water-band and walk, thus realize back flushing.
In step (3), after the absorption of described polymeric adsorbent to solute molecule reaches capacity, manipulation of regeneration is carried out to polymeric adsorbent.
Compared with prior art, the present invention has the following advantages: 1, in the present invention due to the high efficiency separation effect of micro-pore aeration hyperfiltration membrane assembly, therefore final separating effect is much better than traditional settling tank, and process water outlet is extremely limpid, suspended substance and turbidity are close to zero, and bacterium and virus are significantly removed.Simultaneously, Ultra filtration membrane also makes microorganism be dammed in membrane module completely, make can maintain higher microorganism concn in system, not only increase the overall removal efficiency of reaction unit to pollutent, ensure that good effluent quality, the various changes of simultaneous reactions device to influent load have good adaptability, anti impulsion load, can stablize the effluent quality obtaining high-quality.
2, this technique can be run under high volumetric loading, low sludge loading, and excess sludge production is low, reduces sludge treatment expense.
3, can maintain the microbial biomass of high density in resin-column, treatment unit volumetric loading is high, and floor space is saved greatly; This technical process is simple, compact construction, small accommodation area, do not limit by setting place, be suitable for any occasion, also can make ground type, semi-underground type and underground type.
4, because microorganism is dammed completely in micro-pore aeration hyperfiltration membrane assembly, thus be conducive to breeding microorganism slowly and retain growth as nitrobacteria, system nitrification efficiency is improved.Meanwhile, the organism hydraulic detention time in systems in which of some difficult degradations can be increased, be conducive to the raising of hardly degraded organic substance degradation efficiency.
5, this technique achieves being separated completely of hydraulic detention time (HRT) and sludge retention time (SRT), run and control to stablize more flexibly, be the new technology easily realizing equipmentization in sewage disposal, can microcomputer automatic control be realized, thus make operational administrative more convenient.
Embodiment
Below in conjunction with specific embodiment, detailed specific description is done to the present invention, but protection scope of the present invention is not limited to following examples.
After testing, its parameter is percolate pending in the present invention:
First enter in equalizing tank after adopting grid filtration to fall macrobead thing above-mentioned percolate.
Then the pH value of percolate is adjusted to 7.8 ~ 8.9, temperature is adjusted to 20 DEG C ~ 40 DEG C, under excess oxygen, in equalizing tank, add aerobic nitrification bacterium, by the effect of aerobic nitrification bacterium, the ammonium oxidation thing in percolate is converted into nitrite or nitrate.
In this step, biological nitration is under aerobic condition, by the effect of nitrite bacteria and nitrate bacterium, ammonium oxidation is become the process of nitrite and nitrate.If reacted completely, ammonia oxidation becomes nitrate to complete in two stages: the first stage, under the effect of Nitrosomas, make ammonia oxidation become nitrite, and Nitrosomas belongs to strong aerobic autotrophic bacteria, utilizes ammonia as its unique energy source; Subordinate phase, under the effect of Nitromonas, make Nitrite transformation be nitrate, Nitromonas is the extraordinary autotrophic bacteria using nitrous acid as unique energy source.Although some heterotroph also can carry out nitrated, in nitrated, topmost biology is nitrous acid Pseudomonas and nitric acid Pseudomonas.Nitrated optimal ph is 8.4, when pH is in 7.8-8.9 scope, is 90% of optimum velocity.When temperature brings up to 30 DEG C from 5 DEG C, nitrification speeds also constantly increases thereupon, and general temperature should maintain 20 DEG C ~ 40 DEG C and be advisable, and optimum temps is 30 DEG C.
Then the pH value of percolate is adjusted to 6.5 ~ 8.0, temperature is adjusted to 20 DEG C ~ 40 DEG C, under anoxic conditions, denitrifying bacterium is added in equalizing tank, nitrite or nitrate is reduced to nitrogen and overflows from percolate, thus removing ammonium oxidation thing, clearance can reach 70% ~ 95%
The suitable optimal ph of denitrifying bacteria is 7.3, and optimum temps is 30 DEG C, and when temperature is lower than 10 DEG C, denitrification speed obviously declines, and when temperature is low to moderate 3 DEG C, denitrification will stop.Biological denitrificaion can remove multiple nitrogenous compound, and its treatment effect is stablized, and does not produce secondary pollution, and both economical.Biological denitrificaion flow process of the present invention is compared with existing procedure, and have flow process simple, structures are few, and capital cost is low, do not need additional carbon, effluent quality advantages of higher.
Because nitrobacteria is autotrophic bacteria, the generation cycle of growth and breeding is long, in order to make nitrifier can survive in the Sludge System of Continuous Flow, require that the sludge age of system is greater than the mud age of nitrifier, otherwise nitrifier can be eliminated by from system because its turnover rate is greater than breeding potential.Therefore, the mud of nitrification is often longer for age, and load is lower, is difficult to use in process high-concentration ammonia nitrogenous wastewater.Research shows, the membrane bioreactor (MBR) of microorganism of can damming completely can prevent the loss of nitrifier, is a kind of more satisfactory nitrator.Membrane bioreactor (MBR) processes high ammonia-nitrogen wastewater tool and has an enormous advantage: first, and in MBR, high-concentration activated sludge can accelerate ammonia nitrogen and organic degradation rate, improves processing efficiency; Secondly, it is long for generation time that MBR is conducive to propagation, the nitrifier of flocculence difference, the specific growth rate decreasing nitrobacteria is low, and the longer SRT of MBR can maintain nitrifier quantity effectively, and total viable count is directly proportional to sludge concentration, sludge concentration is higher, and number of viable is also higher.
The percolate of removing ammonium oxidation thing is injected microporous membrane aeration hyperfiltration membrane assembly, described microporous membrane aeration hyperfiltration membrane assembly entirety is in tubular, its outside is membrane module, and its top is provided with water-in and pressurized gas entrance, is provided with aeration head and Butterworth Hatch bottom it; Percolate enters in membrane module by water-in, first organism in percolate is degraded by mud by aeration by percolate, then percolate is under the ordering about of pressurized gas, wherein micromolecular material leaches from ultra-filtration membrane, form filtrate and enter in resin column, macromolecular material is then stayed in membrane module.
Membrane separating process is the sepn process of efficient a, environmental protection, with traditional isolation technique as distilled, adsorbing, absorb, extract, compared with low temperature separation process etc., have more advantage.
When accumulation in membrane module has more organism, injected by the Butterworth Hatch below membrane module by wash-down water, and be connected with pressurized air by aeration head, wash-down water and pressurized air make the organism be attached on membrane module inwall peel off jointly, and be rinsed water-band and walk, thus realize back flushing.The effect of aeration is make use of in this step, make the even concussion of the formation utilizing pressurized gas in hyperfiltration membrane assembly between fiber, the pollution substance being attached to membrane fiber surface is peeled off, and be rinsed water-band and walk, thus reach the object of strengthening developing result and saving backwash water consumption, prevent film silk from being shaken disconnected.
The polymeric adsorbent arranged in last resin column adsorbs the solute molecule in filtrate, after the Adsorption of solute in filtrate, and the filtrate qualified discharge be disposed.After the absorption of described polymeric adsorbent to solute molecule reaches capacity, manipulation of regeneration is carried out to polymeric adsorbent.
In the present embodiment, final outflow water is detected, after tested, meet the related request of country " household refuse landfill sites Environmental capacity standard " (GB 16889-2008).
Claims (3)
1., based on a method for treating garbage percolation liquid for micro-pore aeration ultrafiltration and absorption, it is characterized in that comprising the following steps: (1), percolate is adopted grid filtration after enter in equalizing tank;
Removing ammonium oxidation thing is needed after completing steps (1), concrete steps are: first the pH value of percolate is adjusted to 7.8 ~ 8.9, temperature is adjusted to 20 DEG C ~ 40 DEG C, under excess oxygen, in equalizing tank, add aerobic nitrification bacterium, by the effect of aerobic nitrification bacterium, the ammonium oxidation thing in percolate is converted into nitrite or nitrate; Then the pH value of percolate is adjusted to 6.5 ~ 8.0, temperature is adjusted to 20 DEG C ~ 40 DEG C, under anoxic conditions, denitrifying bacterium is added in equalizing tank, nitrite or nitrate is reduced to nitrogen and overflows from percolate, thus removing ammonium oxidation thing, clearance reaches 70% ~ 95%;
(2), by percolate inject microporous membrane aeration hyperfiltration membrane assembly, described microporous membrane aeration hyperfiltration membrane assembly entirety is in tubular, and its outside is ultra-filtration membrane, and its top is provided with water-in and pressurized gas entrance, is provided with aeration head and Butterworth Hatch bottom it; Percolate enters in membrane module by water-in, first organism in percolate is degraded by mud by aeration by percolate, then percolate is under the ordering about of pressurized gas, wherein micromolecular material leaches from ultra-filtration membrane, form filtrate and enter in resin column, macromolecular material is then stayed in membrane module;
(3), the polymeric adsorbent that arranges in resin column adsorbs the solute molecule in filtrate, after the Adsorption of solute in filtrate, and the filtrate qualified discharge be disposed.
2. according to the method for treating garbage percolation liquid based on micro-pore aeration ultrafiltration and absorption according to claim 1, it is characterized in that: in step (2), when accumulation in membrane module has more organism, wash-down water is injected by the Butterworth Hatch below membrane module, and aeration head is connected with pressurized air, wash-down water and pressurized air make the organism be attached on membrane module inwall peel off jointly, and are rinsed water-band and walk, thus realize back flushing.
3., according to the method for treating garbage percolation liquid based on micro-pore aeration ultrafiltration and absorption according to claim 1, it is characterized in that: in step (3), after the absorption of described polymeric adsorbent to solute molecule reaches capacity, manipulation of regeneration is carried out to polymeric adsorbent.
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| CN112408701B (en) * | 2020-11-03 | 2021-08-24 | 江苏通用环保集团有限公司 | Landfill leachate treatment device and treatment method based on microporous aeration and adsorption |
| CN116022960B (en) * | 2022-12-30 | 2024-01-09 | 安徽蓝鼎环保能源科技有限公司 | Microporous aeration-based full-quantification zero-emission treatment process for landfill leachate |
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| CN101054216A (en) * | 2007-04-03 | 2007-10-17 | 南京大学 | Treatment method for city domestic waste percolate after being filtered by biochemistry film and concentrated |
| CN102515301A (en) * | 2011-12-16 | 2012-06-27 | 同济大学 | Method for removing and recovering humus in leachate of refuse landfill |
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