CN112299655A - Novel treatment process for aged landfill leachate - Google Patents
Novel treatment process for aged landfill leachate Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02F1/5281—Installations for water purification using chemical agents
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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Abstract
The invention relates to a new treatment process of old landfill leachate, which is characterized by comprising the following steps: the method comprises the following steps: (1) preparing an old landfill leachate treatment system; (2) firstly, garbage leachate enters a sewage adjusting tank through a water inlet pipe, a certain amount of NaOH solution is dissolved in a first dosing tank and is added into the sewage adjusting tank through a first dosing pump, and the pH value of the garbage leachate in the sewage adjusting tank is maintained between 10.5 and 11; the landfill leachate in the sewage adjusting tank is directly sent to a wave tube of a dynamic wave stripping device by a sewage centrifugal pump through a rotor flowmeter to carry out foam stripping, liquid stripped by the dynamic wave stripping device flows into a reaction circulation box body, and after repeated circulation, sewage is discharged by a drainage pipeline; (3) the water blown off by the dynamic wave blow-off device sequentially enters an adjusting tank, a reaction tank, a coagulation tank, a sedimentation tank and an A/O type SBR process through drainage pipelines. The investment cost is low, the secondary pollution is reduced, and the treatment and operation cost is greatly reduced.
Description
Technical Field
The invention relates to a novel treatment process of old landfill leachate, and relates to the technical field of landfill leachate treatment.
Background
During the stacking and landfill processes, the garbage undergoes the processes of fermentation, rain washing, leaching, surface water and underground water soaking and the like, a large amount of garbage leachate is generated, and the ammonia nitrogen concentration of the garbage leachate is increased year by year along with the prolonging of the landfill age. Landfill leachate can be regarded as a heavily polluted three-phase system, and improper treatment can cause serious secondary pollution to surface water, underground water, soil and atmosphere, and harm human health. Therefore, landfill leachate must be effectively treated to minimize its environmental impact. However, due to the particularity of the quality of the landfill leachate, the treatment of the landfill leachate still has many problems in technology and economy.
For the treatment of high ammonia nitrogen landfill leachate, currently, a reinforced MBR (Membrane bioreactor) process is widely adopted in practice, and then a 'NF + RO' advanced treatment process (Nanofiltration + Reverse Osmosis) is adopted, the effluent can reach the standard after the treatment of the process, but a large amount of concentrated solution can be generated, the concentrations of organic pollutants, inorganic salts and metal ions which are difficult to degrade in the concentrated solution are higher than those of the leachate, the biodegradability is poor, and more serious secondary pollution can be caused to surface water, underground water, soil environment and the like if the concentrated solution is improperly treated; the nanofiltration concentrated solution flows back to the anaerobic reactor at the front end, wherein high-concentration salt is repeatedly accumulated for many years, vicious circulation is realized, the biochemical reaction system is gradually paralyzed, and finally, the equipment cannot be operated; the cost for treating the landfill leachate by adopting the traditional process is higher and higher. Therefore, the main problems to be solved urgently in the landfill leachate treatment at present are to improve the ammonia nitrogen treatment efficiency in the landfill leachate, reduce the ton water investment, reduce the secondary pollution and prolong the service life of equipment.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a new treatment process for old landfill leachate.
In order to solve the technical problems, the technical scheme of the invention is as follows: a new treatment process for old landfill leachate comprises the following steps:
(1) preparing an old landfill leachate treatment system;
(2) firstly, garbage leachate enters a sewage adjusting tank through a water inlet pipe, a certain amount of NaOH solution is dissolved in a first dosing tank and is added into the sewage adjusting tank through a first dosing pump, and the pH value of the garbage leachate in the sewage adjusting tank is maintained between 10.5 and 11; the landfill leachate in the sewage adjusting tank is directly sent to a wave tube of a dynamic wave stripping device by a sewage centrifugal pump through a rotor flowmeter to carry out foam stripping, liquid stripped by the dynamic wave stripping device flows into a reaction circulation box body, and after repeated circulation, sewage is discharged by a drainage pipeline;
(3) the water blown off by the dynamic wave blow-off device sequentially enters an adjusting tank, a reaction tank, a coagulation tank and a sedimentation tank through drainage pipelines, and the adjusting tank is diluted with H2SO4Adjusting the pH value of the effluent to 3-4, and adding FeSO into a reaction tank4·7H2Mixing O with raw water, adding H into coagulation tank2O2Performing Fenton reaction, finally adjusting the pH value of a water sample to about 8 by using NaOH, standing in a sedimentation tank for 0.5 h, discharging supernatant through a drainage pipeline, and discharging lower sediment through a mud valve;
(4) and (3) feeding the effluent after the Fenton reaction into an A/O type SBR process by adopting instantaneous water inlet, stirring and operating for 3 hours under an anoxic condition, controlling the DO concentration of an anoxic section to be 0.2 mg/L, then operating for 8 hours under an aeration condition, keeping the aeration quantity of an aerobic aeration section constant, controlling the DO concentration of the aerobic section to be 3-4 mg/L, and discharging the effluent after precipitating for 30 minutes from the reactor.
Preferably, a dynamic wave stripping device is adopted for strengthening pretreatment, NaOH is added into a first medicine adding groove before treatment to adjust the pH value to 10.5, the stripping time is 5 hours, the water inflow is adjusted to 0.4 m/h, and the gas inflow is 155 m/h, namely the gas-liquid ratio is 387.5.
Preferably, the pH value of the sewage is adjusted to 3-4 in the Fenton reaction, the generation of hydroxyl free radicals (. OH) is facilitated at the pH value, and FeSO is added4·7H2Mixing O with raw water, adding H2O2After full reaction, the pH value is adjusted to about 8 by NaOH, which is beneficial to the generation of flocculation and precipitation.
Preferably, the A/O type SBR process has an operation period of 12 hours, 2 periods are operated every day, the anoxic stirring time is 3 hours, the aeration time is 8 hours, the precipitation time is 30 minutes, and the water is discharged and then is statically placed for 30 minutes, and then the water is fed in the next period.
Preferably, the old landfill leachate treatment system comprises a sewage inlet pipe (1), a first dosing tank (2), a first dosing pump (3), a sewage adjusting tank (4), a sewage centrifugal pump (5), a pressure gauge (6), a dynamic wave blowing-off device (7), a reaction circulating box body (8), a power distribution control cabinet (9), a partition plate (10), a speed-adjustable fan (11), an intake flowmeter (12), a dynamic wave blowing-off nozzle (13), a wave tube (14), a backflow pipeline (15), a drain pipe control valve (16), a drain pipe (17), a second dosing tank (18), a second dosing pump (19), an adjusting tank (20), a reaction tank (22), a solid dosing device (23), a stirring device (24), a third dosing tank (25), a third dosing pump (26), a coagulation tank (27), a fourth dosing tank (29), a fourth dosing pump (30), The device comprises a sedimentation tank (31), a water outlet valve (32), a mud valve (33), an A/O type SBR reactor (34), an air compressor (35), a gas flowmeter (36), a microporous aeration head (37), a DO tester (39), a DO probe (40), a pH tester (41), a pH probe (42) and an emptying valve (45).
Preferably, the input end of the water inlet pipe (1) is connected with landfill leachate in a landfill equalizing tank, the output end of the water inlet pipe (1) is communicated with a water inlet at the top of a sewage adjusting tank (4), NaOH is uniformly mixed with the landfill leachate in the sewage adjusting tank (4) through a first dosing pump (3) through a first dosing groove (2), the output end of the sewage adjusting tank (4) is connected with a sewage centrifugal pump (5), the landfill leachate enters a wave tube (14) of a dynamic wave stripping device (7) through a pressure gauge (6) and is ejected upwards in a radial rotational flow form by a dynamic wave stripping nozzle (13) in the wave tube (14), high-speed airflow is in countercurrent contact with high-speed rotating liquid flow in the wave tube (14) through an air inlet flow meter (12) by a speed-adjustable fan (11), and the liquid stripped by the dynamic wave stripping device (7) flows into a reaction circulation box body (8), inside vertical baffle (10) that is equipped with of reaction cycle box (8), all be equipped with the clearance between the top of baffle (10) and bottom and reaction cycle box (8), through baffle (10) among the reaction cycle box (8) water conservancy stirring back partly liquid send to power wave blow off device (7) by sewage centrifugal pump (5) once more through backflow pipeline (15) and carry out the circulation blow off and handle, power distribution switch board (9) are equipped with on power wave blow off device (7), open drain pipe control valve (16), the sewage after the blow off is discharged to equalizing basin (20) by drainage pipe (17).
Preferably, the sewage after blowing off is mixed with H fed by a second feeding tank (18) through a second feeding pump (19)2SO4Uniformly mixing in a regulating tank (20), wherein the output end of the regulating tank (20) is connected with a reaction tank (22) and FeSO through a drainage pipeline4·7H2O is added into the reaction tank (22) through a solid medicine adding device (23), and FeSO is added by a stirring device (24) on the reaction tank (22)4·7H2O and sewage are mixed evenly, the reaction tank (22) is connected with a coagulation tank (27), and H2O2Enters a coagulation tank (27) through a third dosing groove (25) and a third dosing pump (26) and is provided with uniform Fe2+The sewage and the sewage are uniformly mixed and reacted in a coagulation tank (27) by a stirring device, the coagulation tank (27) is connected with a sedimentation tank (31), NaOH enters the sedimentation tank (31) through a fourth dosing tank (29) and a fourth dosing pump (30) to adjust the pH value of the sewage to about 8, so that sludge is settled, supernatant enters an A/O type SBR reactor (34) through a water outlet valve (32), and the settled sludge is discharged through a sludge discharge valve (33).
Preferably, the sewage after the Fenton reaction treatment enters an A/O type SBR reactor (34), the operation is carried out for 3 hours under the condition of oxygen deficiency by a stirring device, air is ejected by an air compressor (35) through a gas flowmeter (36) through a microporous aeration head (37), the microporous aeration head (37) is positioned at the inner bottom of the A/O type SBR reactor (34), the operation is carried out for 8 hours under the condition of aeration, DO is connected with a DO tester (39) through a DO probe (40) at the inner top of the A/O type SBR reactor (34) for monitoring, pH is connected with a pH tester (41) through a pH probe (42) at the inner top of the A/O type SBR reactor (34), the treated effluent is discharged through a water discharge valve and a water discharge pipe, and a vent valve (45) is arranged at the bottom of the A/O type SBR reactor (34) and used for emptying and discharging mud.
Compared with the prior art, the invention has the following beneficial effects: the treatment process adopts a novel non-membrane process to treat the landfill leachate, has low investment cost, reduces secondary pollution, greatly reduces the treatment and operation cost, particularly has high removal rate of nitrogen elements and organic matters in the landfill leachate, and ensures that COD, TN, ammonia nitrogen and the like in treated effluent reach the discharge standard of the pollution control standard of the domestic refuse landfill (GB 16889-2008).
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.
In the figure: the device comprises a water inlet pipe (1), a first dosing tank (2), a first dosing pump (3), a sewage adjusting tank (4), a sewage centrifugal pump (5), a pressure gauge (6), a dynamic wave blowing-off device (7), a reaction circulating box body (8), a power distribution control cabinet (9), a partition plate (10), a speed-adjustable fan (11), an intake flowmeter (12), a dynamic wave blowing-off nozzle (13), a wave tube (14), a backflow pipeline (15), a drain pipe control valve (16), a drain pipe (17), a second dosing tank (18), a second dosing pump (19), an adjusting tank (20), a reaction tank (22), a solid dosing device (23), a stirring device (24), a third dosing tank (25), a third dosing pump (26), a coagulation tank (27), a fourth dosing tank (29), a fourth dosing pump (30), a sedimentation tank (31), a water outlet valve (32), a mud discharge valve (33), An A/O type SBR reactor (34), an air compressor (35), a gas flowmeter (36), a microporous aeration head (37), a DO tester (39), a DO probe (40), a pH tester (41), a pH probe (42) and a release valve (45).
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, a new treatment process for old landfill leachate includes the following steps:
(1) preparing an old landfill leachate treatment system;
(2) firstly, garbage leachate enters a sewage adjusting tank through a water inlet pipe, a certain amount of NaOH solution is dissolved in a first dosing tank and is added into the sewage adjusting tank through a first dosing pump, and the pH value of the garbage leachate in the sewage adjusting tank is maintained between 10.5 and 11; the landfill leachate in the sewage adjusting tank is directly sent to a wave tube of a dynamic wave stripping device by a sewage centrifugal pump through a rotor flowmeter to carry out foam stripping, liquid stripped by the dynamic wave stripping device flows into a reaction circulation box body, and after repeated circulation, sewage is discharged by a drainage pipeline;
(3) the water blown off by the dynamic wave blow-off device sequentially enters an adjusting tank, a reaction tank, a coagulation tank and a sedimentation tank through drainage pipelines, and the adjusting tank is diluted with H2SO4Adjusting the pH value of the effluent to 3-4, and adding FeSO into a reaction tank4·7H2Mixing O with raw water, adding H into coagulation tank2O2Performing Fenton reaction, finally adjusting the pH value of a water sample to about 8 by using NaOH, standing in a sedimentation tank for 0.5 h, discharging supernatant through a drainage pipeline, and discharging lower sediment through a mud valve;
(4) and (3) feeding the effluent after the Fenton reaction into an A/O type SBR process by adopting instantaneous water inlet, stirring and operating for 3 hours under an anoxic condition, controlling the DO concentration of an anoxic section to be 0.2 mg/L, then operating for 8 hours under an aeration condition, keeping the aeration quantity of an aerobic aeration section constant, controlling the DO concentration of the aerobic section to be 3-4 mg/L, and discharging the effluent after precipitating for 30 minutes from the reactor.
In the embodiment of the invention, a dynamic wave stripping device is adopted for strengthening pretreatment, NaOH is added into a first medicine adding groove before treatment to adjust the pH value to 10.5, the stripping time is 5 hours, the water inflow is adjusted to 0.4 m/h, and the gas inflow is 155 m year/h, namely the gas-liquid ratio is 387.5.
In the embodiment of the invention, the pH value of the sewage needs to be adjusted to 3-4 in the Fenton reaction, the generation of hydroxyl free radicals (. OH) is facilitated at the pH value, and FeSO is added4·7H2Mixing O with raw water, adding H2O2After full reaction, the pH value is adjusted to about 8 by NaOH, which is beneficial to the generation of flocculation and precipitation.
In the embodiment of the invention, one operation period of the A/O type SBR process is 12 hours, the A/O type SBR process is operated for 2 periods every day, the anoxic stirring time is 3 hours, the aeration time is 8 hours, the sedimentation time is 30 min, and the water is discharged and then is statically placed for 30 min before the water is fed into the next period.
In the embodiment of the invention, the old landfill leachate treatment system comprises a sewage inlet pipe (1), a first dosing tank (2), a first dosing pump (3), a sewage adjusting tank (4), a sewage centrifugal pump (5), a pressure gauge (6), a dynamic wave blowing-off device (7), a reaction circulating box body (8), a power distribution control cabinet (9), a partition plate (10), a speed-adjustable fan (11), an intake flow meter (12), a dynamic wave blowing-off nozzle (13), a wave tube (14), a backflow pipeline (15), a drain pipe control valve (16), a drain pipe (17), a second dosing tank (18), a second dosing pump (19), an adjusting tank (20), a reaction tank (22), a solid dosing device (23), a stirring device (24), a third dosing tank (25), a third dosing pump (26), a coagulation tank (27), a fourth dosing tank (29), A fourth dosing pump (30), a sedimentation tank (31), a water outlet valve (32), a mud valve (33), an A/O type SBR reactor (34), an air compressor (35), a gas flowmeter (36), a microporous aeration head (37), a DO tester (39), a DO probe (40), a pH tester (41), a pH probe (42) and an emptying valve (45).
In the embodiment of the invention, the input end of a water inlet pipe (1) is connected with landfill leachate in a landfill equalizing tank, the output end of the water inlet pipe (1) is communicated with a water inlet at the top of a sewage adjusting tank (4), NaOH is uniformly mixed with the landfill leachate in the sewage adjusting tank (4) through a first dosing pump (3) by a first dosing groove (2), the output end of the sewage adjusting tank (4) is connected with a sewage centrifugal pump (5), the landfill leachate enters a wave tube (14) of a dynamic wave stripping device (7) through a pressure gauge (6) and is ejected upwards in a radial rotational flow form by a dynamic wave stripping nozzle (13) in the wave tube (14), high-speed airflow is in countercurrent contact with high-speed rotating liquid flow in the wave tube (14) by an adjustable-speed fan (11) through an intake flowmeter (12), and the liquid stripped by the dynamic wave stripping device (7) flows into a reaction circulation box body (8), inside vertical baffle (10) that is equipped with of reaction cycle box (8), all be equipped with the clearance between the top of baffle (10) and bottom and reaction cycle box (8), through baffle (10) among the reaction cycle box (8) water conservancy stirring back partly liquid send to power wave blow off device (7) by sewage centrifugal pump (5) once more through backflow pipeline (15) and carry out the circulation blow off and handle, power distribution switch board (9) are equipped with on power wave blow off device (7), open drain pipe control valve (16), the sewage after the blow off is discharged to equalizing basin (20) by drainage pipe (17).
In the embodiment of the invention, the sewage after blowing off is mixed with H fed from a second feeding tank (18) through a second feeding pump (19)2SO4Uniformly mixing in a regulating tank (20), wherein the output end of the regulating tank (20) is connected with a reaction tank (22) and FeSO through a drainage pipeline4·7H2O is added into the reaction tank (22) through a solid medicine adding device (23), and FeSO is added by a stirring device (24) on the reaction tank (22)4·7H2O and sewage are mixed evenly, the reaction tank (22) is connected with a coagulation tank (27), and H2O2Enters a coagulation tank (27) through a third dosing groove (25) and a third dosing pump (26) and is provided with uniform Fe2+The sewage is uniformly mixed and reacted in a coagulation tank (27) by a stirring device, the coagulation tank (27) is connected with a sedimentation tank (31), NaOH enters the sedimentation tank (31) through a fourth dosing tank (29) and a fourth dosing pump (30) to adjust the pH value of the sewageAnd (3) settling the sludge, allowing the supernatant to enter an A/O type SBR reactor (34) through a water outlet valve (32), and discharging the settled sludge through a sludge discharge valve (33).
In the embodiment of the invention, sewage after Fenton reaction treatment enters an A/O type SBR reactor (34), the operation is carried out for 3 hours under the condition of oxygen deficiency by stirring with a stirring device, air is ejected by an air compressor (35) through a gas flowmeter (36) through a microporous aeration head (37), the microporous aeration head (37) is positioned at the inner bottom of the A/O type SBR reactor (34), the operation is carried out for 8 hours under the condition of aeration, DO is connected with a DO tester (39) through a DO probe (40) at the inner top of the A/O type SBR reactor (34) for monitoring, pH is connected with a pH tester (41) through a pH probe (42) at the inner top of the A/O type SBR reactor (34), treated effluent is discharged through a water outlet valve and a water discharge pipeline, and a vent valve (45) is arranged at the bottom of the A/O type SBR reactor (34) for emptying and discharging sludge.
The principle of the invention is as follows (the process for treating the landfill leachate by combining dynamic wave stripping strengthening pretreatment and biological treatment):
(1) the liquid flow rotating at high speed at the middle lower part of the dynamic wave stripping device is in countercurrent contact with the high-speed airflow from the top of the wave tube, when the gas phase and the liquid phase reach momentum balance, the liquid phase jet flow rotating at high speed can be involved in a large amount of gas phase, and because the pressurized gas wrapped and divided by the liquid phase is continuously increased and expanded outwards, the gas phase continuously wrapped and clamped and separated by the liquid phase forms a large amount of bubbles, and at the moment, ammonia nitrogen in different combination forms in the landfill leachate is NH3Or N2、NO2The ammonia nitrogen is dissociated out, is resolved into a gas phase through a huge gas-liquid interface formed by foam, and then leaves the system along with a large amount of airflow entering a dynamic wave device to finish the separation of ammonia nitrogen.
(2) The substances in the Fenton reagent which play an oxidizing role are generated by reaction2+Catalysis H2O2The decomposition is generated, and the detailed process can have the following reactions:
Fe2+ + H2O2 → Fe3+ + OH- + •OH
RH + •OH → R• + H2O
R• + Fe3+ → R+ + Fe2+
Fe2+ + •OH → Fe3+ + OH-
the formation of OH is favored at low pH. Fe in Fenton reagent2+Is oxidized into Fe in the reaction3+Then Fe3+With OH-The reaction at high pH favors the formation of a flocculent precipitate, into which some of the organic matter in the wastewater enters for removal.
(3) SBR is a short name of a sequencing batch activated sludge process, and is an activated sludge sewage treatment technology which operates in an intermittent aeration mode. When the reactor is started, the activated sludge contains a large amount of heterotrophic bacteria (denitrifying bacteria) and the content of nitrifying bacteria in the sludge is very low, so that the sludge needs to be domesticated, and the nitrifying bacteria in the system are dominant by improving the COD and the ammonia nitrogen concentration in the inlet water, so that the domestication purpose is achieved. The A/O type SBR process makes the reaction environment inside the tank in alternate anaerobic-aerobic state through regulating the anaerobic stirring and aerobic aeration time and sequence inside the reactor, and makes ammonia nitrogen oxidized into NO under the action of nitrifying bacteria in aerobic state2 --N and NO3 -N, NO is converted by the action of denitrifying bacteria under anaerobic conditions2 --N and NO3 -Reduction of-N to N2And removing the pollutants.
The invention has the beneficial effects that:
1. the invention combines dynamic wave stripping strengthening pretreatment, Fenton oxidation and A/O type SBR biological treatment, and the separation efficiency of ammonia nitrogen can reach more than 90 percent through the dynamic wave stripping pretreatment; after the dynamic wave stripping, a Fenton reagent is selected for strong oxidation, the removal effect on COD is good, the B/C value is improved to be more than 0.47 from 0.16, the ammonia nitrogen value of the percolate can be reduced by the A/O type SBR process, and the removal of pollutants is realized through the denitrification process in the anaerobic stirring stage.
2. Compared with the existing landfill leachate treatment process (the enhanced MBR process is followed by the 'NF + RO' advanced treatment process), the method adopts the novel non-membrane process to treat the landfill leachate, reduces the investment cost, solves the problem of membrane concentrated solution from the source, reduces the secondary pollution, has less influence of the system integration by the limiting factors such as external temperature and the like, and greatly reduces the treatment and operation cost.
3. The treatment process has low cost, good treatment effect and less secondary pollution, particularly has high removal rate of nitrogen elements and organic matters in the landfill leachate, and ensures that COD, TN, ammonia nitrogen and the like in the treated effluent reach the discharge standard of the pollution control standard of the domestic garbage landfill (GB 16889-2008).
4. The treatment cost (medicament, labor and water power) per ton of water for treating the high ammonia nitrogen landfill leachate is 46 yuan, the investment cost per ton of water is saved by more than 20% compared with the traditional landfill leachate treatment process, the operation cost per ton of water is reduced by more than 15%, the annual saving operation cost reaches more than 1.32 yuan, and the method has good application prospect for the design and the reconstruction of aged landfill sites.
Application example 1:
the TN content of the leachate treatment plant equalizing tank of the comprehensive treatment plant of the Hongmiao mountain garbage in Fuzhou city is about 1200 mg/L, the ammonia nitrogen content is about 950 mg/L, and the COD content is about 3500 mg/L; adopt power wave to blow off the device and strengthen the preliminary treatment, throw in first medicine feed groove (2) before the preliminary treatment process and add NaOH and adjust pH to 10.5, blow off the time to 5H, adjust the inflow and be 0.4 m/H, the air input is 155 m year/H, and the gas-liquid ratio is 387.5 promptly, the dynamic wave blows off the water of going out after handling and gets into equalizing basin (20), with the H of dilution and gets into equalizing basin (20)2SO4Adjusting the pH value of the percolate to 3-4, and adding FeSO4·7H2O is put into a reaction tank (22) and then added with H2O2Reacting in a coagulation tank (27) for 20-30 min, adjusting the pH value of a water sample to about 8 in a sedimentation tank (31) by NaOH, standing for 0.5 h, allowing the supernatant to enter an A/O type SBR reactor (34), operating for 3h under anoxic stirring, operating for 8h under aerobic aeration, allowing sedimentation for 30 min, standing for 30 min after water outlet, and then performing water inlet of the next period.
The effluent quality after the treatment by the process is as follows: the COD is 90 mg/L, the TN is 35 mg/L, the ammonia nitrogen is 20 mg/L, and the standard of pollution control of the domestic waste landfill (GB 16889-2008) that TN is less than 40 mg/L and the ammonia nitrogen is less than 25 mg/L, COD is less than 100 mg/L is met.
The invention is not limited to the above best mode, and any person can derive other novel old landfill leachate treatment processes in various forms under the teaching of the invention. All equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (8)
1. A new treatment process for old landfill leachate is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing an old landfill leachate treatment system;
(2) firstly, garbage leachate enters a sewage adjusting tank through a water inlet pipe, a certain amount of NaOH solution is dissolved in a first dosing tank and is added into the sewage adjusting tank through a first dosing pump, and the pH value of the garbage leachate in the sewage adjusting tank is maintained between 10.5 and 11; the landfill leachate in the sewage adjusting tank is directly sent to a wave tube of a dynamic wave stripping device by a sewage centrifugal pump through a rotor flowmeter to carry out foam stripping, liquid stripped by the dynamic wave stripping device flows into a reaction circulation box body, and after repeated circulation, sewage is discharged by a drainage pipeline;
(3) the water blown off by the dynamic wave blow-off device sequentially enters an adjusting tank, a reaction tank, a coagulation tank and a sedimentation tank through drainage pipelines, and the adjusting tank is diluted with H2SO4Adjusting the pH value of the effluent to 3-4, and adding FeSO into a reaction tank4·7H2Mixing O with raw water, adding H into coagulation tank2O2Performing Fenton reaction, finally adjusting the pH value of a water sample to about 8 by using NaOH, standing in a sedimentation tank for 0.5 h, discharging supernatant through a drainage pipeline, and discharging lower sediment through a mud valve;
(4) and (3) feeding the effluent after the Fenton reaction into an A/O type SBR process by adopting instantaneous water inlet, stirring and operating for 3 hours under an anoxic condition, controlling the DO concentration of an anoxic section to be 0.2 mg/L, then operating for 8 hours under an aeration condition, keeping the aeration quantity of an aerobic aeration section constant, controlling the DO concentration of the aerobic section to be 3-4 mg/L, and discharging the effluent after precipitating for 30 minutes from the reactor.
2. The new process for treating aged landfill leachate according to claim 1, wherein: adopt dynamic wave to blow off the device and strengthen the preliminary treatment, add NaOH and adjust pH to 10.5 in first medicine feed groove before the processing, blow off time is 5h, adjust the inflow and be 0.4 m thin year/h, and the inflow is 155 m thin year/h, promptly the gas-liquid ratio is 387.5.
3. The new process for treating aged landfill leachate according to claim 1, wherein: the pH value of the sewage needs to be adjusted to 3-4 in the Fenton reaction, the generation of hydroxyl free radicals (. OH) is facilitated under the pH value, and FeSO is added4·7H2Mixing O with raw water, adding H2O2After full reaction, the pH value is adjusted to about 8 by NaOH, which is beneficial to the generation of flocculation and precipitation.
4. The new process for treating aged landfill leachate according to claim 1, wherein: the A/O type SBR technology has the operation period of 12 hours, 2 periods are operated every day, the anoxic stirring time is 3 hours, the aeration time is 8 hours, the sedimentation time is 30 minutes, and the water is discharged and then stands for 30 minutes, and then the water is fed in the next period.
5. The new process for treating aged landfill leachate according to claim 1, wherein: the old landfill leachate treatment system comprises a sewage inlet pipe (1), a first dosing tank (2), a first dosing pump (3), a sewage adjusting tank (4), a sewage centrifugal pump (5), a pressure gauge (6), a dynamic wave blowing-off device (7), a reaction circulation box body (8), a power distribution control cabinet (9), a partition plate (10), a speed-adjustable fan (11), an air intake flowmeter (12), a dynamic wave blowing-off sprayer (13), a wave tube (14), a backflow pipeline (15), a drain pipe control valve (16), a drain pipe (17), a second dosing tank (18), a second dosing pump (19), an adjusting tank (20), a reaction tank (22), a solid dosing device (23), a stirring device (24), a third dosing tank (25), a third dosing pump (26), a coagulation tank (27), a fourth dosing tank (29), a fourth dosing pump (30), The device comprises a sedimentation tank (31), a water outlet valve (32), a mud valve (33), an A/O type SBR reactor (34), an air compressor (35), a gas flowmeter (36), a microporous aeration head (37), a DO tester (39), a DO probe (40), a pH tester (41), a pH probe (42) and an emptying valve (45).
6. The new process for treating aged landfill leachate according to claim 5, wherein: the input end of a water inlet pipe (1) is connected with landfill leachate in a landfill equalizing tank, the output end of the water inlet pipe (1) is communicated with a top water inlet of a sewage adjusting tank (4), NaOH is uniformly mixed with the landfill leachate in the sewage adjusting tank (4) through a first dosing tank (2) and a first dosing pump (3), the output end of the sewage adjusting tank (4) is connected with a sewage centrifugal pump (5), the landfill leachate enters a wave tube (14) of a dynamic wave stripping device (7) through a pressure gauge (6) and is ejected upwards in a radial rotational flow form by a dynamic wave stripping nozzle (13) inside the wave tube (14), high-speed airflow is in countercurrent contact with high-speed rotating liquid flow inside the wave tube (14) through an air inlet flow meter (12) by a speed-adjustable fan (11), the liquid stripped by the dynamic wave stripping device (7) flows into a reaction circulation box body (8), a partition plate (10) is vertically arranged inside the reaction circulation box body (8), all be equipped with the clearance between the top of baffle (10) and bottom and reaction circulation box (8), through baffle (10) among the reaction circulation box (8) after the water conservancy stirring partly liquid deliver to power ripples blow off device (7) by sewage centrifugal pump (5) again through backflow pipeline (15) and carry out the circulation blow off and handle, power distribution switch board (9) are equipped with on power ripples blow off device (7), open drain pipe control valve (16), the sewage after blowing off is discharged to equalizing basin (20) by drainage pipe (17).
7. The new process for treating aged landfill leachate according to claim 6, wherein: sewage after blowing off and H added by a second medicine adding groove (18) through a second medicine adding pump (19)2SO4Mixing in a regulating tank (20)The output end of the equalizing tank (20) is connected with the reaction tank (22) and the FeSO through a drainage pipeline4·7H2O is added into the reaction tank (22) through a solid medicine adding device (23), and FeSO is added by a stirring device (24) on the reaction tank (22)4·7H2O and sewage are mixed evenly, the reaction tank (22) is connected with a coagulation tank (27), and H2O2Enters a coagulation tank (27) through a third dosing groove (25) and a third dosing pump (26) and is provided with uniform Fe2+The sewage and the sewage are uniformly mixed and reacted in a coagulation tank (27) by a stirring device, the coagulation tank (27) is connected with a sedimentation tank (31), NaOH enters the sedimentation tank (31) through a fourth dosing tank (29) and a fourth dosing pump (30) to adjust the pH value of the sewage to about 8, so that sludge is settled, supernatant enters an A/O type SBR reactor (34) through a water outlet valve (32), and the settled sludge is discharged through a sludge discharge valve (33).
8. The new process for treating aged landfill leachate according to claim 7, wherein: the sewage after the Fenton reaction treatment enters an A/O type SBR reactor (34), the sewage is stirred by a stirring device under the anoxic condition for 3 hours, air is ejected by an air compressor (35) through a gas flowmeter (36) through a microporous aeration head (37), the microporous aeration head (37) is positioned at the inner bottom of the A/O type SBR reactor (34), the sewage is operated for 8 hours under the aeration condition, DO is connected with a DO tester (39) through a DO probe (40) at the inner top of the A/O type SBR reactor (34) for monitoring, pH is connected with a pH tester (41) through a pH probe (42) at the inner top of the A/O type SBR reactor (34), the treated effluent is discharged through a water discharge pipe for a water discharge valve, and an emptying valve (45) is arranged at the bottom of the A/O type SBR reactor (34) and used for emptying and discharging mud.
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