CN102674623A - Method for treating landfill leachate - Google Patents
Method for treating landfill leachate Download PDFInfo
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- CN102674623A CN102674623A CN2011100668781A CN201110066878A CN102674623A CN 102674623 A CN102674623 A CN 102674623A CN 2011100668781 A CN2011100668781 A CN 2011100668781A CN 201110066878 A CN201110066878 A CN 201110066878A CN 102674623 A CN102674623 A CN 102674623A
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Abstract
The invention discloses a method for treating landfill leachate. The method comprises the following steps of: feeding the landfill leachate into an adjustment tank first, sequentially feeding the landfill leachate into a biological contact oxidation pond, a low-oxygen aeration tank, a nitrosation reaction tank, an anaerobic ammonium oxidation reaction tank and a microwave treater, finally feeding the landfill leachate into a separator, performing precipitation separation to separate active carbon obtained after microwave treatment from the outlet water of the landfill leachate, and then discharging the outlet water which meets the standard. The technology for treating the landfill leachate saves energy and is high in efficiency and low in consumption; and by the method, pollutants such as organic pollutants, nitrogen (N) and phosphorus (P) can be effectively removed, and the environmentally acceptable treatment and discharge of the landfill leachate can be realized finally.
Description
Technical field
The present invention relates to a kind of waste water treatment process, particularly a kind of rubbish leachate treatment method.。
Background technology
The processing of percolated liquid in city refuse landfill is a unusual stubborn problem in landfill yard design, operation and the management always.The high concentrated organic wastewater of this complicated component of percolate is handled and is not directly entered environment if do not add, and can cause serious water pollution accident and endangers ecotope.The percolate that produced of the simple landfill disposal of rubbish mainly was to rely on the lower floor soil to purify in the past; But along with the prolongation of time and tectonic structure finiteness to the pollutant removal capacity; Percolate can pollute underground water, surface water and refuse landfill surrounding environment; Make surface water water hypoxia, water quality deterioration, eutrophication, serious threat tap water and industrial or agricultural water water source are polluted quality of groundwater and lose utility value.If organic pollutant gets into food chain with the direct threats human health, there is data to show, have 18500 landfill yards to the U.S. in 1997, almost have half the water body have been produced pollution.Yan Tan water source, China East Lanzhou basin is discarded because of percolate pollutes, and horse beach, western basin waterhead area part well is scrapped.The luxuriant of Macao and Zhuhai intersection encloses because of Macao's percolate pollutes, and makes the fishes and shrimps disappearance of local river, the farmland underproduction etc.In percolate such as the unprocessed entering drinking water source, the pollution substance in the percolate leans on conventional water supply purification technology generally to be difficult to remove.Because the property complicated and changeable of percolate water quality and quantity does not still have very perfect treatment process at present, percolate has been processed into a global difficult problem.
Rubbish leachate treatment method comprises physico-chemical processes and biological process.The physical chemistry method processing cost is higher, pollutes to be difficult to thorough removal.Though the ammonia blow-off method like domestic frequent employing at present has higher ammonia nitrogen removal efficient, there is the shortcoming that investment running cost is high, deamination tail gas is difficult to administer.Shenzhen Xia Ping refuse landfill to adopt stripping tower is an example, and the construction investment of ammonia stripping part accounts for about 30% of gross investment, and running cost accounts for more than 70% of total processing cost.In addition, blow-off method receives the weather restriction very big.Therefore percolate processing at present mainly is to adopt biological process; But existing these biological process treatment scheme complex process, treatment step is many, and equipment is various; Facility, investment of devices are bigger; And it is generally less relatively to handle the water yield, causes depreciation, upkeep cost higher, and investment, the running cost therefore handled are higher.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of garbage filter liquid processing method of efficient, energy-conservation, low consumption, thereby overcomes the deficiency of prior art.
For solving the problems of the technologies described above technical scheme of the present invention: a kind of rubbish leachate treatment method.This method mainly comprises following treatment step:
(1), percolate is sent in the biological contact oxidation pond, utilize the microbial film in the biological contact oxidation pond to remove pollutents such as degradable COD, part NH3-N, P in the percolate through absorption, oxygenolysis;
(2), the biological contact oxidation pond water outlet is sent in the low-oxygen aeration pond, percolate is carried out modifier treatment and removes part difficult degradation pollutent, improve the biodegradability of percolate;
(3), the water outlet of low-oxygen aeration pond is sent in the nitrosation reaction pond, utilize the active sludge of domestication that part NH3-N is oxidized to NO2--N;
(4), the water outlet of nitrosation reaction pond is sent in the Anammox reaction tank, utilize anaerobic ammoxidation activity mud, remove the NH3-N in the percolate through the Anammox reaction;
(5), the water outlet of Anammox reaction tank is sent in the microwave treater, utilize gac, remove residual difficult degradation COD and NH3-N in the water outlet of Anammox reaction tank through the microwave catalysis oxygenizement as sensitizing agent;
(6), at last the microwave treater water outlet is sent in the separator, get final product qualified discharge after through precipitate and separate the gac in the water outlet being separated from percolate.
In the above-mentioned rubbish leachate treatment method, before percolate is sent into biological contact oxidation pond, preferably earlier percolate is sent in the equalizing tank,, and played the pre-treatment effect through equalizing tank regulate and store flow and homogenizing water quality.
In the aforementioned rubbish leachate treatment method, the HRT (hydraulic detention time) of percolate in biological contact oxidation pond is 1d in the step (1).
In the aforementioned rubbish leachate treatment method, the biological contact oxidation pond water outlet is 2d at the HRT in low-oxygen aeration pond (hydraulic detention time) in the step (2).
In the aforementioned rubbish leachate treatment method, the HRT (hydraulic detention time) of low-oxygen aeration pond water outlet in the nitrosation reaction pond is 2d in the step (3), and SRT (mud mud age) is 3d.
In the aforementioned rubbish leachate treatment method, HRT (hydraulic detention time be) 1d of nitrosation reaction pond water outlet in the Anammox reaction tank in the step (4).
In the aforementioned rubbish leachate treatment method, microwave treatment power is 720W in the step (5), and microwave frequency is 2450MHz, and the microwave treatment treatment time is 30min, and the dosage of the used sensitizing agent of microwave treatment is 20g/L.
Beneficial effect of the present invention: compared with prior art, the present invention utilizes the microbial film of biological contact oxidation pond domestication that the biodegradable COD in the percolate is removed, and removes a certain amount of NH3-N, P and BOD simultaneously; Utilize in the low-oxygen aeration pond and tamed active sludge (containing aerobic bacteria and aerobic-anaerobic microbe) difficult degradation COD is degraded, transforms, improve the biodegradable of percolate; Utilize the nitrosation reaction pond, realize stable nitrosification through control reaction tank envrionment conditions, the accumulation nitrite, and guarantee that water outlet NH3-H/NO2-N maintains 1.1～1.3, for the Anammox reaction tank provides suitable water inlet condition; The Anammox reaction tank utilizes the water outlet of nitrosation reaction pond as water inlet, under the Degradation of anaerobic ammonia oxidizing bacteria, removes most NH3-H; Microwave treater utilizes residual COD, NH3-N in the water outlet of microwave catalysis oxidation removal Anammox reaction tank, guarantees that system's effluent quality is up to standard; The main effect of separator is the gac that contains through precipitating and isolating in the water outlet, makes effluent quality satisfy " consumer waste filling and embedding pollution control criterion " (GB16889-1997) primary standard.
The present invention is a kind of refuse leachate treatment technology of energy-conservation, efficient, low consumption, can remove organic pollutant (COD), nitrogen (N), phosphorus pollutents such as (P) simultaneously, finally realizes the processing discharging up to standard of percolate.The present invention sets about from the relative merits of conventional garbage leachate treatment technology; And with the characteristic of percolate as origin; Simultaneously to reduce the percolate treatment operating costs as important indicator; The garbage filter liquid processing method has been carried out big quantity research, found out the good method that percolate is handled through the optimum combination of technology.Because the treatment effect of biologic treating technique is good, running cost is low, the present invention adopts biological treatment that the easy degraded composition in the percolate is removed, and utilizes physico-chemical process to remove again for residual hardly degraded organic substance.Owing to have the organic pollutant of many difficult degradations and organic or inorganic colloid pollution thing that some are stable in the percolate; Cause conventional treatment process to be difficult to the treatment effect that reaches satisfied; The present invention adopts microwave treatment; Because the microwave catalysis oxygenizement impels the fluid molecule of percolate to produce high-frequency vibration; Thereby destroy the colloidal rock steady structure and make its flocculation or adsorbed by sensitizing agent, because the existence of sensitizing agent, sensitizing agent absorbs lot of energy under microwave action; Under the acting in conjunction of multiple effect, thereby the hardly degraded organic substance of each attitude in the percolate all can effectively be handled make the difficult degradation COD mineralising and efficient removal of percolate.
The present invention has following characteristics:
(1) utilize the lower biological process of processing cost with the biodegradable organic pollutant removal of major part; Utilize anaerobic ammonia oxidation process to remove ammonia nitrogen in high density; And with the microwave catalysis oxidation technology as follow-up assurance technology, can effectively reduce percolate and handle working cost, reduce processing cost.
(2) biological treatment, anaerobic ammonia oxidation process, microwave treatment are united in order to the treating refuse percolate, but integrated degree that has improved treatment system and reuse.
(3) through being set separately, the nitrosation reaction pond realizes separating of dominant bacteria with the Anammox reaction tank; Improved the stability of technology; Avoided the competition between the different sorts dominant bacteria; And the adapt circumstance condition is provided for efficient bacterial strain, and help to improve the stability of system, removing for the stability and high efficiency of pollutent provides assurance.Adopt mixed culture method enrichment Anammox mud, realized the efficient removal of percolate NH3-N.
(4) the present invention is provided with the low-oxygen aeration pond between bio-contact oxidation reaction tank and nitrosation reaction pond, can realize the modified effect of waste water, also can effectively remove the part pollutent.Because dissolved oxygen concentration is lower in the low-oxygen aeration pond, need not carry out a large amount of aerations, energy consumption is lower.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Embodiment
Embodiment 1.As shown in Figure 1, garbage leachate treatment process of the present invention carries out according to following steps:
(1), percolate is sent in the equalizing tank, through equalizing tank regulate and store flow and homogenizing water quality, and play the pre-treatment effect;
(2), then percolate is sent in the biological contact oxidation pond, utilize the microbial film in the biological contact oxidation pond to remove biodegradable COD (COD), part NH3-N (ammonia nitrogen) and P pollutents such as (phosphorus) in the percolate through absorption, oxygenolysis; The optimal HRT (hydraulic detention time) of percolate in biological contact oxidation pond is 1d.
(3), the biological contact oxidation pond water outlet is sent in the low-oxygen aeration pond, percolate is carried out modifier treatment and removes part difficult degradation pollutent; Percolate is 2d in the optimal HRT (hydraulic detention time) in low-oxygen aeration pond.
(4), the water outlet of low-oxygen aeration pond is sent in the nitrosation reaction pond, utilize the active sludge of domestication part NH3-N to be oxidized to NO2--N through nitrosation reaction; The optimal HRT (hydraulic detention time) of percolate in the nitrosation reaction pond is 2d, and SRT (mud mud age) is 3d.
(5), the water outlet of nitrosation reaction pond is sent in the Anammox reaction tank, utilize anaerobic ammoxidation activity mud, remove the NH3-N in the percolate through the Anammox reaction; Optimal HRT (hydraulic detention time be) 1d of percolate in the Anammox reaction tank.
(6), the water outlet of Anammox reaction tank is sent in the microwave treater, utilize gac, remove residual hardly degraded organic substance and NH3-N in the Anammox reaction tank through the microwave catalysis oxygenizement as sensitizing agent; The dosage of sensitizing agent is 20g/L, and microwave treatment power is 720W, and the microwave treatment treatment time is 30min.
(7), at last the microwave treater water outlet is sent in the separator, get final product qualified discharge after through precipitate and separate sensitizing agent used in the microwave processing process being separated from the percolate water outlet.
Embodiment of the present invention is not limited to the foregoing description, and the various variations of under the prerequisite that does not break away from aim of the present invention, making all belong within protection scope of the present invention.
For verifying effect of the present invention and confirming optimization control parameter, the applicant has carried out lot of test and research, and its result is following:
One, equalizing tank
The main effect of this equalizing tank is the adjusting of percolate being carried out the water quality and the water yield, and the difference in balance wet season and low water season for percolation liquid treating system provides the constant water yield, can play the pre-treatment effect simultaneously.According to the on-site geological condition in landfill reservoir area, equalizing tank can adopt underground type or semi-underground type.Adopt density polyethylene film with high to carry out antiseepage with inwall at the bottom of the equalizing tank of the present invention pond, adopt the precast slab protection on the film.The volume of equalizing tank should be complementary with landfill process, the residence time, percolate generation and supporting sewage treatment facility scale etc.
Two, biological contact oxidation pond
1. testing apparatus
The pond type of the biological contact oxidation pond of the present invention's test is a rectangular parallelepiped, L * B * H=350 * 350 * 600mm, and the design useful volume is 50L, superelevation is 192mm.Pond body material is an ABS sheet material.Biological contact oxidation pond is a single flow, fills filler in the pond, and aeration head is evenly arranged in the bottom, and dissolved oxygen concentration is regulated through the control aeration rate.Water discharge valve is arranged on the middle part of biological contact oxidation pond useful volume, and the bottom is provided with blow-off valve.Utilize portable dissolved oxygen instrument and pH meter on-line determination D0 and pH respectively, adjust according to practical situation.
2. biologic packing material
Filler material, structure etc. have influence on biomembranous proterties and hydraulic performance, have determined the treatment effect of biological contact oxidation metallization processes.Because on the suspension type filler a large amount of fine-fibered silks are arranged, thus mikrobe is had the good adsorption effect, and its extension film is fast, and treatment effect is stable, and it is less influenced by environmental change; But if select the balling-up of hardening easily of soft-filler, microbial film for use, cause process result degrades, therefore, biological contact oxidation pond filler of the present invention is selected medium-soft property suspension type Vilaterm filler for use.Because the filler filling ratio can have influence on waterpower environment and mass transfer effect in the biological contact oxidation pond, therefore, confirm that suitable filler filling ratio is very necessary.When filler more after a little while, the system biological volume of holding is low, treatment effect can be a greater impact.According to correlative study, the filler filling ratio value of biological contact oxidation pond of the present invention is 30%.
3. test materials
Biological contact oxidation pond of the present invention adopts aerobic activated sludge as seed sludge, and aerobic sludge is taken from Guiyang City, Guizhou Province river WWT plant aeration tank.Percolate is taken from Guiyang City, Guizhou Province high wild goose household refuse landfill sites equalizing tank.Sewage is taken from Guizhou University's second teaching building septic tank.
4. testing apparatus starts
Get the 10L active sludge and place in the container, constantly stir the mud flco is broken up, make aerobic bacteria be in suspended state.Biological contact oxidation pond seed sludge amount is 10L, occupies to imitate volumetrical 20%.In biological contact oxidation pond, inject the 40L sewage then, starting aerator is the biological contact oxidation pond oxygen supply, and dissolved oxygen concentration is controlled at 1.5～2.0mg/L.Hang during the film, the biological contact oxidation pond operation scheme adopts intermittent water inflow, intermittent drainage, and the cycle of operation is 12h, and wherein flooding time is 0.5h, and the aeration phase time length is 10h, and the time of staticly settling is 1h, and water discharge time is 0.5h.Each, flooding quantity was 1/2 of a biological contact oxidation pond useful volume reaction time, was 25L.It is 50L/d that biological contact oxidation pond is handled the water yield, and hydraulic detention time is 24h.Stop aeration 1h before the draining, staticly settle the back and discharge supernatant, add the former water of equivalent then, the reaction of beginning next cycle.The test initial period at first carries out vexed exposing to the sun to biological contact oxidation pond, and the vexed time of exposing to the sun is 48h.Common sewage is adopted in water inlet during vexed exposing to the sun.Behind the vexed 48h that exposes to the sun, the semi soft packing surface has a small amount of faint yellow mucous membrane shape microbial film to occur, and sporadicly is distributed with microbial film on the filler.Microscopy can be observed mikrobes such as the campanularian, ciliate, lamblia of small-amount free shape.The 3d of domestication, the coherent substance on the filler thickens, and color burn.The microbial film that 4d can observe filling surface significantly thickens; Its color also gradually becomes tawny; Microscopy can find to have the darker zoogloea of ciliate, lamblia and the color of ciliate such as the campanularian of sessile form, a tired branch worm, swimming type etc.; Simultaneously can also see a spot of nematode, the about 0.4～0.6mm of microbial film thickness.Tame 6d, filling surface is evenly distributed with the microbial film that a layer thickness is about 0.6mm, and color is tawny, and microscopy can find that a large amount of campanularians is arranged in the microbial film, osculum campanularian, a tired branch worm, the fine worm of shield etc., and metazoan has wheel animalcule, nematode etc.Water outlet is limpid in the biological contact oxidation pond simultaneously, and suspension content is less in the water outlet, and these can show that biomembranous cultivation domestication is ripe.After utilizing common sewage to hang film, utilize modified percolate to carry out acclimation shaking culture then, make microbial film adapt to the percolate influent quality.For making microbial film can comparatively fast adapt to percolate influent quality condition, avoid the impact that causes because of change of water quality is excessive simultaneously, test adopts the ladder culture method to carry out the microbial film domestication.Percolate mixes as water inlet according to 1: 3,2: 3,1: 1,3: 2 ratios with tap water, adopts percolate as water inlet at last fully.Test moves the sign of success or not as evaluation system with the removal effect of pollutents such as COD, NH3-N, TN.
5. hang mem stage pollutant removal changing conditions
When utilizing modified percolate that the microbial film in the biological contact oxidation pond is carried out acclimation shaking culture, COD, NH3-N, TN influent concentration variation range are as shown in table 1.
Table 1 influent quality changing conditions unit: mg/L
Can know that to sum up the biological contact oxidation pond microbial film is through after the acclimation shaking culture of nearly 60d, the removal efficient of COD, NH3-N, TN maintains maintenance level, and water outlet COD, NH3-N, TN concentration fluctuate with influent concentration to some extent, but change less.The microbial film that the more common sewage of microbial film color is cultivated is deepened, and color is Vandyke brown, and microbe species reduces to some extent.The steady removal of pollutent shows that biofilm structure tends towards stability.Cultivate through staged, biomembranous domestication process progress is comparatively smooth, through domestication constantly, and the microbial film percolate influent quality that suited gradually.The steady removal of pollutents such as COD, NH3-N, TN also indicates the completion of microbial film domestication.
6. biological contact oxidation pond HRT confirms
Confirm that rational HRT not only can guarantee the steady removal to all contaminations, also can reduce construction investment simultaneously.If the HRT value is less, under the situation of same treatment amount, will certainly increase the volume of biological contact oxidation pond, cause unnecessary waste.Test moves 7d respectively with biological contact oxidation pond when hydraulic detention time (HRT) is 0.5d, 0.75d, 1d, 1.5d, 2d, intaking is percolate, and dissolved oxygen concentration all is controlled at 1.5mg/L～2.0mg/L.Through the clearance of COD, NH3-N, TN under the more different HRT conditions, confirm rational hydraulic detention time.When hydraulic detention time (HRT) was 0.5d, the clearance of pollutent was lower, and this is that Pollutant levels residual in the water outlet are higher because the HRT Pollutant Treatment load that causes less than normal is higher, and microbial film is incomplete to contaminant degradation.Along with HRT increases gradually, the removal efficient of pollutents such as COD, NH3-N, TN constantly increases.When HRT when 1d increases to 2d, contaminant removal efficiency changes less.According to pollutant removal situation under the different HRT conditions, the present invention confirms that the reasonable HRT of biological contact oxidation pond is 1d, and the COD average removal rate of this moment is 71.02%, and the NH3-N average removal rate is 51.8%, and the TN average removal rate is 51.9%.
Brief summary: the aerobic activated sludge that (1) this test utilization is broken up is as seed sludge; Dosage occupies when imitating volumetrical 20%, water inlet for sewage; Biological contact oxidation pond is hung the film success about 7d, the microbial film mean thickness is about 0.6mm, and color is tawny.
(2) test utilizes semi soft packing as biofilm carrier, and it is respond well to hang film, and the phenomenon that do not harden.The filler filling ratio is 30%, and gas distribution in the system, water distribution are even, for the removal of pollutent provides good hydraulics and nutrient environment.
(3) percolate that utilizes dilution is as water inlet, and through about 60d ladder acclimation shaking culture, the system biological film is tamed successfully, and pollutants removal rate is stabilized in higher level.COD clearance variation range is 70.5%～76.38% when water inlet is percolate, and NH3-N clearance variation range is 50.07%～53.93%, and TN clearance variation range is 48.14%～53.12%.
(4) through to contaminant removal efficiency analyses such as COD, NH3-N, TN, along with the increase of HRT, the systemic contamination thing is removed efficient and is increased.Biological contact oxidation pond is when HRT=1d, and pollutent COD clearance is 71.02%, and the NH3-N average removal rate is 51.8%; The TN average removal rate is 51.9%; When HRT continued to increase, pollutants removal rate changed less, confirmed that therefore the reasonable HRT of biological contact oxidation pond is 1d.
Three, low-oxygen aeration pond
1. testing apparatus
Testing apparatus mainly comprises elevated tank, low-oxygen aeration pond.Elevated tank is the plastics bucket, and useful volume is 60L.The pond type in low-oxygen aeration pond is a rectangular parallelepiped, and material is an ABS sheet material, is of a size of L * B * H=500 * 350 * 750mm, and superelevation is 179mm.Low-oxygen aeration pond useful volume is 100L.Water discharge valve is positioned at the mid-way of low-oxygen aeration pond useful volume, and the bottom evenly is furnished with the sandstone aeration head, and bottom central position, low-oxygen aeration pond is provided with one and stirs pump.Utilize the D0 and the pH value in portable dissolved oxygen meter and pH meter continuous monitoring low-oxygen aeration pond.
2. test materials and flow process
2.1 test materials
Low-oxygen aeration pond seed sludge is an aerobic activated sludge, and mud is taken from Guiyang City, Guizhou Province river WWT plant aeration tank.Percolate is taken from Guiyang City, Guizhou Province high wild goose household refuse landfill sites equalizing tank.Sewage is taken from Guizhou University's second teaching building septic tank.
2.2 technical process
Test adopts common aeration tank as reactor drum.Waste water is added in the elevated tank; Radiator drain connects the reactor drum water inlet pipe, and flow is controlled by water intaking valve, after the under meter metering, injects in the low-oxygen aeration pond; Make the streamflow regime of reactor drum be in complete admixture through aeration effect and stirring pump; Active sludge fully contacts with waste water, and pollutent is by the microbiological deterioration in the active sludge, and the sewage after the processing is drained through water shoot.
3. the low-oxygen aeration pond starts
3.1 influent quality
The startup in low-oxygen aeration pond is divided into sludge seeding, culturing sludge, sludge acclimatization three phases.Adopt sewage during sludge seeding; Culturing sludge, sludge acclimatization utilize tap water that percolate dilution back is intake as reactor drum.The water quality characteristic of different steps water inlet is seen table 2.
Table 2 different steps influent quality characteristic
3.2 device starts
Sludge seeding amount in low-oxygen aeration pond is 20L, accounts for 20% of reactor drum useful volume.In the low-oxygen aeration pond, inject the 80L sewage then, starting aerator is the reactor drum oxygen supply, and dissolved oxygen concentration is controlled at about 0.5mg/L.The operation scheme of reactor drum adopts intermittent water inflow, intermittent drainage between the active sludge during cultivation, and the cycle of operation is 12h, and wherein flooding time is 0.5h, and the aeration phase time length is 10h, and the time of staticly settling is 1h, and water discharge time is 0.5h.Each, flooding quantity was 1/2 of a reactor drum useful volume reaction time, was 50L.It is 1OOL/d that the water yield is handled in the low-oxygen aeration pond, and hydraulic detention time tentatively is decided to be 24h.Stop aeration 1h before the draining, staticly settle the back and discharge supernatant, add the former water of equivalent then, the reaction of beginning next cycle.Test temperature, pH do not control.Initial period at first carries out vexed exposing to the sun to reactor drum, and the vexed time of exposing to the sun is 48h.The test initial stage adopts the good sewage of biochemical as water inlet.Spoil disposal not in the test domestication process is to keep sludge concentration higher in the system and long sludge retention time.In the low-oxygen aeration pond, active sludge is that the aggregate (floc sludge) with flco exists.Low-oxygen aeration pond sludge concentration is higher, effluent quality better is target and the successful sign of startup that the low-oxygen aeration pond starts.The formation of the active sludge that settling property is good makes the active sludge that can keep high density in the low-oxygen aeration pond.After the inoculation, for the ease of the startup of reactor drum, the reactor drum initial load should not be too high, and as water inlet, hydraulic detention time is 24h with sewage.Improve constantly the ratio of percolate in the water into then, accomplish the acclimation shaking culture of active sludge.
4. pollutant removal situation in the acclimation shaking culture process
Through the acclimation shaking culture of 48d, the activated sludge acclimatization in low-oxygen aeration pond is accomplished, and is 2100mg/L through measuring MLSS (mixed solution sludge concentration) mean concns, and the low-oxygen aeration pond is comparatively stable to the removal effect of COD, NH3-N, TN.
5. optimal water power standing time is confirmed
Confirm that rational HRT not only can guarantee the steady removal of system to all contaminations, can also reduce investment.When the same treatment scale, hydraulic detention time selects the excessive treatment effect that then can cause relatively poor, can not satisfy the effluent quality requirement.The HRT value is less than normal then can augmenting response pond volume, increases investment, causes unnecessary waste.5 250mL Erlenmeyer flasks are got in test; In each Erlenmeyer flask, add the active sludge of equivalent, the mud dosage is 50mL, injects the 150mL percolate to reactor drum then; Erlenmeyer flask is numbered A～E, and the hydraulic detention time of corresponding reactor drum is 0.5d, 1d, 1.5d, 2d, 4d successively.With Erlenmeyer flask as for cultivating in the shaking table, measure every day each Erlenmeyer flask COD, NH3-N, TN go out water concentration.When HRT when 0.5d becomes 1d, the COD clearance changes greatly, rangeability is about 10%; When HRT continued to increase, the COD clearance changed less.When HRT=4d, the COD average removal rate in low-oxygen aeration pond is 57%.Yet during HRT=2d, the removal efficient of COD is also higher, and the COD average removal rate of this moment is 54.5%.Comparatively speaking, under the identical situation of treatment scale, when the volume of reactor drum is HRT=2d during HRT=4d 2 times of reactor volume, invest obviously much higher.When HRT=0.5d, the NH3-N average removal rate of low-oxygen aeration is merely 12%, and this is because the NH3-N load is too high, and the generation of active sludge in the system is impacted, and causes the NH3-N removal effect not good.Along with the increase of HRT, NH3-N load progressively reduces, and is accompanied by the raising of NH3-N clearance, and when HRT increased to 2d, the NH3-N average removal rate reached 21%, when being HRT=0.5d 1.75 times.When HRT increased to 4d, NH3-N removed efficient and is increased to 25.2%.Along with the increase gradually of HRT, the clearance of TN increases gradually, and the TN clearance under the different HRT conditions is also comparatively stable.When HRT=0.5d, the average removal rate of TN is 13%, and removal effect is undesirable.When HRT=4d, the average removal rate of TN is 29%.
Can know that to sum up when HRT increased, the clearance of pollutents such as COD, NH3-N, TN constantly increased.When HRT was less than normal, the pollutant load that active sludge bears in the low-oxygen aeration pond was higher, and activity receives certain inhibition, and degradation effect is relatively poor.But too prolong the increase that HRT also can be accompanied by cost of investment.Through above-mentioned analysis, when HRT=2d, though the clearance of the clearance of COD, NH3-N, TN during a little less than HRT=4d, pollutant removal is better; And the cost of investment under the same treatment scale is obviously lower.According to pollutant removal situation under the different HRT conditions, the present invention confirms that the reasonable HRT of biological contact oxidation pond is 2d, and the COD average removal rate of this moment is 54.5%, and the NH3-N average removal rate is 21%, and the TN average removal rate is 25%.
Brief summary: (1) this test utilizes common aeration tank to cultivate active sludge, and dissolved oxygen concentration is controlled to be 0.5mg/L, and seed sludge is an aerobic activated sludge, and the seed sludge amount accounts for 20% of low-oxygen aeration pond useful volume.Through the acclimation shaking culture of 48d, active sludge has adapted to the percolate influent quality gradually, and test determination mud MLSS concentration is 2100mg/L.
(2) during the acclimation shaking culture, when the initial start stage water inlet was sewage, active sludge was higher to the COD clearance, and the clearance fluctuation range is 80%～84.8%.Along with the change of influent quality, the COD clearance changes greatly.When percolate water inlet COD concentration was 1000mg/L, COD clearance variation range was 46%～48.8%, and average removal rate is about 47%.
(3) during the acclimation shaking culture, NH3-N, TN clearance changing conditions and COD basically identical.When water inlet was entirely percolate, NH3-N, TN average removal rate were respectively 20%, 29%.
(4) clearance of pollutents such as COD, NH3-N, TN when analyzing different HRT confirms that finally the optimum HRT in low-oxygen aeration pond is 2d, and the COD average removal rate of this moment is 54.5%, and the NH3-N average removal rate is 21%, and the TN average removal rate is 25%.
Four, nitrosation reaction pond
1. nitrosification mechanism
Ammonia oxidation bacteria at first is oxidized to NH2OH and H2O with NH4+-N under the effect of ammonia monooxygenase, two external source electronics in this process pass to monooxygenase through cytopigment and coenzyme by the oxyammonia oxydo-reductase from follow-up oxyammonia oxidation.NH2OH is oxidized to NO2-to carry out under the effect of oxyammonia oxydo-reductase.
2. the startup in nitrosation reaction pond
2.1 plant the mud source
As seed sludge, the sludge seeding amount is 20L, accounts for 20% of reactor drum useful volume with 80% aerobic nitrification mud, 20% garden soil extract.The method that test adopts ladder to increase the water inlet Pollutant levels is carried out acclimation shaking culture to intrasystem ammonia oxidation bacteria.Initial stage adopts sewage as water inlet, and between domestication, as water inlet, final stage adopts percolate as water inlet to percolate fully according to 1: 3,2: 3,3: 2 dilution backs of thinning ratio.Test is removed as the sign of estimating the success or not of nitrosification activated sludge acclimatization with the stability and high efficiency of pollutent.In the biological contact oxidation pond microbial film domestication process, COD, NH3-N, TN influent concentration are as shown in table 3.
Table 3 influent quality changing conditions unit: mg/L
2.2 reactor drum operational conditions
The reactor drum of SBR (sequencing batch active sludge) reactor drum as the NO2-accumulation adopted in this test, and material is an ABS sheet material.Reactor size is L * B * H=500 * 350 * 750mm, and useful volume is 100L.Reactor drum adopts the thermostatically heating rod to keep intrasystem homo(io)thermism, and dissolved oxygen concentration is regulated through the control aeration rate.Reactor drum adopts intermittent water inflow, intermittent drainage.Be 12h each reaction time (T), and wherein flooding time is 11.5h, and aeration time is 11.5h, leaves standstill 25min, and water discharge time is 5min; Be one-period (12h) idle mixing time.Each cycle water inlet of reactor drum, water displacement are 1/4 (being 25L) of reactor drum useful volume, and behind the end cycle, the post precipitation supernatant is discharged through water shoot.The MLSS of system changes according to test conditions, is unartificial controlled variable.Through control D0 concentration, pH and temperature, ammonia oxidizing bacteria can eliminate the nitrite-oxidizing bacteria competition, for nitrosification provides favourable condition.Test aeration zone pH is controlled at 7.8～8.2, and temperature is controlled at 35 ℃ ± 0.5 ℃, and the dissolved oxygen fluctuation range is at 0.4mg/L～0.8mg/L.
2.3SBR reactor start-up
The successful startup in this test nitrosation reaction pond is meant that nitrosification water outlet NO2--N/NH3-N is controlled at about 1.2.The nitrosation reaction pond starts to the common 45d consuming time of steady running.
3. optimal HRT is confirmed
With taking out a certain amount of mud in the nitrosation reaction pond; The glass of the 500mL that 5 rubber plugs that are placed in seal shakes in the bottle; The line number of going forward side by side, hydraulic detention time is set at 1d, 2d, 2.5d, 3d successively, utilizes medical large syringe to realize water inlet, water outlet; Analyze the influence of HRT to the nitrite accumulation effect, and then definite system optimal water power standing time.When HRT=1d, system MLSS fluctuation range is bigger, and the sludge stream vector is greater than the mud increment in the illustrative system, and this moment, the NH3-N of system degradation rate and nitrosification rate also presented instability.When HRT=2d, 2.5d, system MLSS fluctuates in a comparatively stable scope, keeps running balance between illustrative system mud increment and the number of dropouts.This moment, system can keep NH3-N degradation rate and nitrosification rate 52～65%.When HRT=3d, system MLSS keeps stable, because the system sludge turnover rate reduces; Nitromonas has been accomplished accumulation in system; Progressively occupied the superiority of system, caused the superiority forfeiture of Nitrosomas, the system that makes changes complete nitrated type system into by the nitrosification type.For keeping MLSS in the system (mixed solution sludge concentration), hydraulic detention time should be got higher value; Take into account the superiority of Nitrosomas in the system simultaneously, then the suitable value of the hydraulic detention time of system is suitably littler.Finally choose the hydraulic detention time of HRT=2d as the nitrosation reaction pond, this moment, the NH3-N degradation rate of system maintained higher level, can realize the accumulation of nitrite.
4. the SRT's of system confirms
The SRT of nitrosification system is the key factor that influences the NO2--N accumulation.Test is set at 3 groups with the SRT value, and the time is respectively 2d, 3d, 4d.30 cycles of each SRT steady running are through measuring NH3-N and NO2--N concentration, the treatment effect of decision-making system and the NO2--N of system accumulation.Can know that by test system's nitrite accumulation of HRT=2d, 2.5d is respond well, because the long practicality that influences system of hydraulic detention time.Test adopts water inlet continuously, intermittent drainage to realize separating of HRT and SRT, HRT≤SRT that can system.The HRT value of process of the test Central Asia nitrification is 2d.When the SRT=2d of system, system's utilization is spoil disposal intermittently, and the control residence time of mud in reactor drum, system MLSS descends very fast, causes the NH3-N load to rise.System NH3-N removal effect presents continuous downtrending, and the degradation rate of NH3-N has only 25%～30% behind the 7d.Mud is constantly discharged, and has realized that " washing out " of Nitromonas guaranteed that Nitrosomas is in intrasystem superiority.The nitrosification rate of system rises to 76.5% of 7d by initial 45.9%.Reaction when proceeding to 11d in the system MLSS be merely 310mg/L, all the other each item indexs of system are all comparatively steady.After test then moved 4d, water outlet NH3-N was up to 897mg/L, water outlet NOx--N＜120mg/L.System's operation failure when the result shows SRT=2d.When SRT=3d, because spoil disposal intermittently, the 3800mg/L of system MLSS concentration when starting drops to the 520mg/L of 16d, and the MLSS of system maintains 550～830mg/L scope afterwards, tends towards stability.The NH3-N degradation rate reaches 60% when 6d, in the whole service phase, the NH3-N degradation rate is basicly stable about 60%.This is relatively stable relevant with system MLSS concentration.This moment the NH3-N of system to go out water concentration be 402mg/L.After system starts, the continuous spoil disposal of reactor drum, system's nitrosification rate rises to 80.5% of 6d from 43.9% of the initial stage rapidly.The 5d～46d, system's nitrosification rate variation range is 65%～85%, the nitrosification rate is higher, average out to 75%.The water outlet N02--N of system concentration is up to 450～570mg/L (about about 485mg/L) at this moment, and system's water outlet NO3--N concentration only has 58～186mg/L (about about 120mg/L).The result shows, Nitrosomas is than the Nitromonas status of having the advantage in the system, and system's nitrosification rate is more much higher than nitrated rate.In the preceding 7d of system's operation, the NH3-N degradation rate is basicly stable, but changes with MLSS concentration change relation remarkable.When MLSS concentration was higher in the system, the NH3-N degradation rate maintained 64～72%, and the MLSS of system descends subsequently, and the NH3-N degradation rate also slowly drops to 49～53% thereupon, and water outlet NH3-N is at 450～630mg/L.According to SRT=2,3, three nitrosification systems of 4d are started, move and analyze respectively, when SRT=3d, can obtain the highest nitrosification rate (about 75%) and higher NH3-N degradation rate (about 60%).The HRT of SBR system is taken as 2d, and when SRT was controlled to be 3d, system can obtain nitrosification effect preferably, and the NH3-N degradation efficiency is higher.Testing best SRT is 3d.
Brief summary: (1) test utilizes the sbr reactor device to carry out the nitrosification active sludge and cultivates; With 80% aerobic nitrification mud, 20% garden soil transudate as seed sludge; The mud dosage accounts for 20% of reactor drum useful volume; Through the cultivation domestication of 46d, system realizes the accumulation of nitrite, and NO2--N/NH4+-N MV is 1.07.
(2) system adopts the staged cultural method, through improving constantly influent load, makes intrasystem nitrosification mud adapt to high loading water inlet condition gradually, and test-results shows the acclimation shaking culture of utilizing this method can accomplish the nitrosification active sludge within a short period of time.
(3) pass through test result analysis, this test optimal HRT is 2d, and this moment, the NH3-N degradation rate of system maintained higher level, can realize the accumulation of nitrite.
(4) according to SRT=2,3, three nitrosification systems of 4d are started, move and analyze respectively, when SRT=3d, can obtain the highest nitrosification rate (about 75%) and higher NH4+-N degradation rate (about 60%).The HRT of SBR system is taken as 2d, and when SRT was controlled to be 3d, system can obtain nitrosification effect preferably, and the NH3-N degradation efficiency is higher.Testing best SRT is 3d.
Five, Anammox reaction tank
1. Anammox and reaction mechanism thereof
The characteristics of Anammox reaction be mikrobe under anaerobic, be electron donor with NH4+-N,, ammonia nitrogen and nitric nitrogen are transformed into N2 enter in the atmosphere as electron acceptor(EA) with NO2--N or NO3--N, it reacts as follows:
5NH4++3NO3-→4N2+9H2O+2H+
NH4++NO2-→N2+H2O
Above-mentioned reaction Δ G＜0 explains and reacts and can spontaneously carry out that the total reaction of anaerobic ammonium oxidation process is an energy yielding reaction, can provide energy to supply microorganism growth.
2. the Anammox reaction tank starts
2.1 testing apparatus
Adopt the sbr reactor device to start Anammox, reactor shape is a rectangular parallelepiped, L * B * H=350 * 350 * 600mm, and useful volume is 50L, and superelevation is 192mm, and material is an ABS sheet material.ABS has opacifying property, can avoid the restraining effect of light to anaerobic ammonia oxidizing bacteria.The built-in cover constent temperature heater of reactor drum, bath temperature is controlled by the automatic constant-temperature heating rod.One of built-in recycle pump.Water-in is positioned at the reactor drum middle and upper part, and water port is positioned at the mid-way of reactor drum useful volume.The top is provided with venting port, and protects with water seal.
2.2 test parameter
Sbr reactor device operation scheme adopts intermittent water inflow, intermittent drainage.System each reaction time (T) is 12h, and wherein flooding time is 0.5h, and be 10h working time, leaves standstill 1h, and water discharge time is 0.5h; Be one-period (12h) idle mixing time.Reactor drum is 25L into and out of the water yield phase weekly.Treatment scale is 50L/d, and the hydraulic detention time of reactor drum is 1d.Behind the end cycle, the post precipitation supernatant is discharged through water shoot.Reactor drum pH is controlled at 7.8～8.2, utilizes constant temperature heating device to be controlled at 35 ℃ ± 0.5 ℃.The MLSS of system changes according to test conditions, is unartificial controlled variable.
2.3 seed sludge and wastewater source
With 50% aerobic nitrification mud, 25% anaerobic sludge, 25% garden soil transudate is seed sludge.In reactor drum, add the 20L seed sludge, add volume and account for 40% of reactor drum useful volume.The test water inlet adopts modified percolate as former water, and duration of test adopts the artificial Sodium Nitrite that adds to replenish the NO2--N in the water inlet, and the deoxygenation of argon gas stripping is all passed through in water inlet, and the ratio of influent ammonia nitrogen and nitrite nitrogen is 1.1～1.3.
2.4 startup reactor drum
Disappearing in the time of ammonia nitrogen and nitrite nitrogen is the key property of Anammox, can be used as the important criterion of Anammox.Endogenous anti-(Asia) endogenous respiration, anaerobic digestion and the death of experience aerobic microbiological, heterotrophic microorganism, heterotrophic denitrification bacterium is nitrated, promptly after the eliminating of mikrobe, " washing out ", successfully starts to 170d Anammox reaction tank.
3. pollutant removal situation between domestication
3.1COD removal situation analysis
Anammox sludge acclimatization initial stage COD water outlet concentration change is less; Prolongation along with the domestication time; The COD water outlet reduces gradually, and acclimation shaking culture is during to 100d, and system's effluent COD concentration is about 800mg/L; In ensuing acclimation shaking culture process, effluent COD concentration is stabilized in about 800mg/L always.At the initial stage of anaerobic ammoxidation activity sludge acclimatization process, the COD clearance changes greatly, and the COD clearance of this moment is merely about 10%.Along with the prolongation of domestication time, the COD clearance linearly rises, and between 78d～106d, clearance is stabilized in about 18%.Anammox mud is proceeded acclimation shaking culture, and the COD clearance increases to some extent, becomes 20% from 18%, and in the end the COD clearance the during stage is comparatively stable.
3.2NH3-N removal situation analysis
The device initial operating stage, water outlet NH3-N concentration is higher, and on average going out water concentration is about 830mg/L.Along with the device prolongation of working time, NH3-N goes out water concentration to be reduced gradually, and the NH3-N in the device steady running process goes out water concentration and maintains basically below the 15mg/L, and effluent quality is better.The NH3-N clearance of device initial operating stage is about 18%, and variation range is bigger, and along with the prolongation of working time, the NH3-N clearance presents straight line to be increased, and the NH3-N maximum material removal rate reaches 99%.The NH3-N oxidation removal rate of steady running system in period is 15%～33%, NO2--N reduction clearance is 65%～90%, NO3--N reduction clearance is about about 50%, and the NH3-N that reactor drum is removed: NO2--N: NO3--N is 1: (2.8～3.6): (0.2～1.8).Microscopy finds that ANAMMOX reactor drum mud is cotton-shaped, flco disperses, out-of-shape, obviously observes to be mingled with a large amount of redness, scarlet particulate in the mud.The mud change in color has been confirmed the development process of anaerobic ammonia oxidizing bacteria in the start-up course, can be used as the indication parameter of reactor start-up process.More than " three nitrogen " characteristic of removing ratio and mud phase indicate that all the Anammox reactive system successfully starts.
4. optimal water power standing time is confirmed
Take out part mud from above-mentioned Anammox reaction tank; 4 rubber plugs that are placed in seal and the constant temperature glass of process shading treatment shakes in the bottle; Realize water inlet, water outlet by the large size injector for medical purpose, analyze the influence of HRT the reactor drum operation, and then definite system optimal water power standing time.Test is provided with 4 groups of hydraulic detention times, is respectively 0.5d, 1d, 2d, 3d.All fluctuations between 15%～30% of the NH3-N of system oxidation removal rate when HRT=0.5d, 1d, 2d, both are slightly on the low side but the value of HRT=0.5d is still than the back; The NH3-N clearance drops to about 10% when HRT=3d.NO2--N reduction clearance is all roughly between 59%～81% when HRT=0.5d, 1d, 2d, no significant difference; But when HRT=3d, because the system response residence time is longer, the clearance of NO2--N rises to more than 90% on the contrary.When HRT=0.5～1d, NO3--N reduction clearance is 45%～50%; When HRT=2～3d, the NO3--N clearance is elevated to 62%～80%.Test confirms that optimal water power standing time is 1d.
Brief summary: (1) test utilizes SBR technology acclimation shaking culture active sludge, is seed sludge with 50% aerobic nitrification mud, 25% anaerobic sludge, 25% garden soil transudate, successfully starts through 170d Anammox reaction tank.
(2) during reactor drum steady running; The NH4+-N oxidation removal rate of system is 15%～33%, NO2--N reduction clearance is 65%～90%, NO3--N reduction clearance is about about 50%, and the NH4+-N that reactor drum is removed: NO2--N: NO3--N is 1: (2.8～3.6): (0.2～1.8).
(3) microscopy finds that ANAMMOX reactor drum mud is cotton-shaped, flco disperses, out-of-shape, obviously observes to be mingled with a large amount of redness, scarlet particulate in the mud.
(4) hydraulic detention time experimental study result shows, Anammox reaction tank optimal water power standing time is 1d, and this moment, system's denitrification effect was better.
Six, microwave treatment
1. microwave induction catalytic is handled ultimate principle
Microwave induction catalytic reaction (Microwave Induced Oxidation Process; Be called for short MIOP) be that HS short pulse microwave radiation is focused on the solid catalyst surface of certain " sensitizing agent "; Because the strong interaction of catalyst sites position and micro-wave energy; Micro-wave energy is transformed into heat, thereby makes some surface point position optionally be heated to very high-temperature very soon, and then causes organism in the reactor drum to contact with the centre of surface that is stimulated reacting.
2. sensitizing agent
The key of microwave induction catalytic technology is a catalyzer, considers the price of sensitizing agent and the complexity of obtaining, and this test is chosen gac as sensitizing agent.Gac can fast processing water under microwave exposure in Persistent organic pollutants.
3. testing apparatus and test materials
The frequency of utilization of microwave mainly contains two kinds of 915MHz and 2450MHz.Because frequency is that the microwave wavelength of 2450MHz is shorter, the break-through ability is stronger, and therefore, the microwave frequency that this test is adopted is 2450MHz, and power is 1200W, and model is EM-202MS1.Percolate is taken from Guiyang City, Guizhou Province high wild goose domestic refuse sanitary filling field equalizing tank, and percolate COD mean concns is about 1000mg/L, and the NH3-N mean concns is about 1000mg/L, pH=7.0～8.5.
4. optimized parameter is confirmed
4.1 the influence of sensitizing agent dosage
This test under the situation of other parameter term harmonizations of control, the removal effect of pollutent when analyzing different dosage.The sensitizing agent dosage is respectively 0.5g, 1g, 2g, 3g, and other factor conditions are respectively microwave treatment power 720W, microwave heating time 30min.Each appearance is got the 100mL percolate.The clearance of test-results: COD and NH3-N increases along with the increase of sensitizing agent dosage, and initial concentration point place compares with not adding, and is little to the difference of the clearance of COD and NH3-N.When the sensitizing agent dosage was 1g, the sample that adds sensitizing agent had had certain difference with the removal effect that does not add.When the sensitizing agent dosage when 2g increases to 3g, the clearance of COD and NH3-N maintains constant level basically.When the sensitizing agent dosage was 2g/100mL, the efficient that the microwave treatment method is removed COD and NH3-N can keep higher level, and the while also can avoid adding in a large number the increase of the processing cost that sensitizing agent causes, so the best dosage of sensitizing agent is 20g/L.
4.2 the influence of microwave treatment time
For analyzing the influence of microwave treatment time to test-results, utilize same microwave device to make an experiment, other test conditionss are identical.Test-results: along with the prolongation in treatment time, the removal of COD takes the lead in sharply increasing, and eases up gradually then, and clearance amplification is less behind the processing 30min; The NH3-N clearance is comparatively slow in the increase for the previous period of beginning, and amplification is bigger behind the 20min, and clearance amplification also tends towards stability gradually behind the processing 30min.When microwave treatment time increases to from 30min the process of 70min, the clearance of COD and NH3-N remains unchanged basically, and it is little to the influence of pollutant removal to prolong the treatment time.Therefore, the optimum handling time of confirming microwave treatment is 30min.
4.3 the influence of microwave treatment power
The release of the power decision microwave energy of microwave, the size of energy is the key whether the influence reaction takes place, therefore the power of microwave being inquired into is the indispensable process of reaction that has microwave to participate in.Fixing other influence factors, the sensitizing agent dosage is 2g, and microwave treatment time is 30min, changes microwave treatment power and is respectively 180W, 360W, 540W, 720W, 900W, 1080W, and water sample is chosen the same.The interval interior amplification of the clearance of test-results: COD from 180W to 360W is bigger, and the interval interior amplification of the clearance of NH3-N from 180W to 540W is all bigger, but the two rising amplitude is less always between from 540W to 1080W.Visible on the variation tendency, in the selected power range of this test, be the 180W except that first reflecting point, other power all can excite oxidizing reaction, and less microwave output power 360W can satisfy COD and removes the requirement of reacting.In addition since behind the 360W increasing degree of NH3-N clearance always greater than the increasing degree of COD clearance can judge microwave power to the influence of the removal of NH3-N greater than the influence that COD is removed.Comprehensive above analysis is also weighed the selected of other influence factors, especially treatment time, finally selects the best microwave treatment power of 720W as this test.
Brief summary: the effect of (1) microwave catalysis oxidation technology catalytic treatment percolate presents higher place to go efficient along with the increase of sensitizing agent dosage to pollutent, when the sensitizing agent dosage is 2g; COD place to go rate is 91.7%; The NH3-N clearance is 84.6%, and when the sensitizing agent dosage continued to increase, pollutent place to go rate rangeability was less; Factor such as comprehensive treatment effect and processing cost, this test confirm that the best dosage of sensitizing agent is 20g/L.
(2) through experimental study, the best power of microwave catalysis oxidation technology treating refuse percolate is 720W, and in the identical condition of other factors of control, the COD clearance is 92.6% when this power, and the NH3-N clearance is 84.6%.
(3) through knowing the analysis of percolate pollutant removal to microwave treatment time; At the microwave treatment percolate initial stage, pollutant removal is along with the prolongation of time, and it is bigger to remove the efficient increasing degree; After the treatment time reaches 30min; Pollutants removal rate tends towards stability basically, and along with the prolongation in treatment time, removal effect changes less.Test is final confirms that the microwave treatment Best Times is 30min.
" water and the effluent monitoring analytical procedure " that water monitoring method of the present invention is all worked out according to NEPA.COD adopts potassium dichromate process; BOD5 adopts the dilution inoculation method; NH3-N adopts Na Shi reagent spectrophotometer method; NO2--N adopts N-1 naphthodiamide spectrophotometry; NO3--N adopts the Pbenoldisulfonic Acid spectrophotometry, and TN adopts alkaline alkaline potassium per-sulfate digestion ultraviolet spectrophotometer method, and SS adopts weighting method.
Claims (7)
1. a rubbish leachate treatment method is characterized in that, mainly comprises following treatment step:
(1), percolate is sent in the biological contact oxidation pond, utilize the microbial film in the biological contact oxidation pond to remove biodegradable COD, part NH3-N and P pollutent in the percolate through absorption, oxygenolysis;
(2), the biological contact oxidation pond water outlet is sent in the low-oxygen aeration pond, percolate is carried out modifier treatment and removes part difficult degradation pollutent;
(3), the water outlet of low-oxygen aeration pond is sent in the nitrosation reaction pond, utilize the active sludge of domestication that part NH3-N is oxidized to NO2--N:
(4), the water outlet of nitrosation reaction pond is sent in the Anammox reaction tank, through the NH3-N in the Anammox reaction removal percolate;
(5), the water outlet of Anammox reaction tank is sent in the microwave treater, utilize gac, remove residual difficult degradation COD and NH3-N in the water outlet of Anammox reaction tank through the microwave catalysis oxygenizement as sensitizing agent;
(6), at last the microwave treater water outlet is sent in the separator, can discharge after through precipitate and separate the gac in the microwave treatment being separated from the percolate water outlet.
2. rubbish leachate treatment method according to claim 1; It is characterized in that: before percolate is sent into biological contact oxidation pond; Earlier percolate is sent in the equalizing tank,, and played the pre-treatment effect through equalizing tank regulate and store flow and homogenizing water quality.
3. rubbish leachate treatment method according to claim 1 is characterized in that: in the step (1), the HRT of percolate in biological contact oxidation pond is 1d.
4. rubbish leachate treatment method according to claim 1 is characterized in that: in the step (2), the HRT of biological contact oxidation pond water outlet in the low-oxygen aeration pond is 2d.
5. rubbish leachate treatment method according to claim 1 is characterized in that: in the step (3), the HRT of low-oxygen aeration pond water outlet in the nitrosation reaction pond is 2d, and SRT is 3d.
6. rubbish leachate treatment method according to claim 1 is characterized in that: in the step (4), the water outlet of nitrosation reaction pond is 1d at the HRT of Anammox reaction tank.
7. rubbish leachate treatment method according to claim 1 is characterized in that: in the step (5), microwave treatment power is 720W, and frequency is 2450MHz, and the microwave treatment treatment time is 30min, and the dosage of sensitizing agent is 20g/L.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107364955A (en) * | 2017-07-31 | 2017-11-21 | 山东中车华腾环保科技有限公司 | A kind of colonization method for being used to handle the filler of sanitary sewage |
| CN107759019A (en) * | 2017-11-07 | 2018-03-06 | 沁济（上海）环境科技有限公司 | A kind of efficient energy-saving and emission-reducing technology for landfill leachate treatment |
| CN109052875A (en) * | 2018-10-29 | 2018-12-21 | 苏州科技大学 | A kind of evening age landfill leachate removal of carbon and nitrogen processing system and method |
| CN111410311A (en) * | 2020-03-26 | 2020-07-14 | 同济大学 | Efficient denitrification method for coupling membrane filtration and anaerobic ammonia oxidation process |
| CN115488142A (en) * | 2022-07-28 | 2022-12-20 | 北京城市排水集团有限责任公司 | Method for synthesizing fully biodegradable plastic raw material by resourcing waste organic matters |
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Application publication date: 20120919 |