CN110550815A - Device and method for advanced treatment of old landfill leachate - Google Patents
Device and method for advanced treatment of old landfill leachate Download PDFInfo
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- CN110550815A CN110550815A CN201910691161.2A CN201910691161A CN110550815A CN 110550815 A CN110550815 A CN 110550815A CN 201910691161 A CN201910691161 A CN 201910691161A CN 110550815 A CN110550815 A CN 110550815A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- Water Supply & Treatment (AREA)
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- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention belongs to the field of treatment of landfill leachate, and particularly relates to a device and a method for advanced treatment of old landfill leachate. The device is including the coagulation sedimentation system, ozone catalytic oxidation system and the MBR reaction unit that connect gradually, and the coagulation sedimentation system includes coagulating sedimentation tank, agitating unit and swash plate/pipe chute, and ozone catalytic oxidation system includes reagent recovery unit and ozone catalytic oxidation pond. The processing method comprises the following steps: the aged landfill leachate enters a coagulating sedimentation tank, a flocculating agent and a coagulant aid are added, and the mixture is stirred and then stands; the aged landfill leachate treated by the coagulating sedimentation tank enters an ozone catalytic oxidation tank, ozone is introduced, and a catalyst is added for reaction; the aged landfill leachate after the ozone catalytic reaction enters a catalyst recovery device, the catalyst is sent back to the ozone catalytic oxidation tank through a catalyst recovery pipe, and the liquid enters an MBR device for reaction and then is discharged. The method has the advantages of simple process, good treatment effect, recyclability of the catalyst and the ozone, and economy.
Description
Technical Field
The invention belongs to the field of treatment of landfill leachate, and particularly relates to a device and a method for advanced treatment of old landfill leachate.
Background
The modern economy develops rapidly, the quality of people's life is gradually improved, the output of municipal domestic waste (MSW) is also increasing continuously, sanitary landfill has been regarded as the mainstream refuse treatment mode with its technological setting simple, easy to operate, the investment cost is less, operation management cost is low, etc., every ton of domestic waste forms about 0.2m 3 percolate after landfill treatment, if improper treatment, landfill leachate direct discharge can seriously pollute the surrounding ecology and environment and even has serious threat to human health, along with the continuous increase of landfill time, the water quality characteristic of the percolate obviously changes, the typical old landfill leachate has low carbon nitrogen ratio, low BOD 5/COD value, high organic concentration, etc., BOD 5/COD value is generally lower than 0.1, the content of easily biodegradable substance is less, research shows, the ammonia nitrogen concentration in old landfill leachate can reach 2000mg/L, the landfill leachate accounts for more than 80% of total nitrogen, at this moment, organic matter uses difficultly biodegradable humic acid substance and rich acid substance as main substance, the molecular concentration of these substances can reach 2000mg/L, the rubbish content accounts for more than 80% of the waste water concentration of the old landfill leachate, the one-stage biological treatment system of domestic sewage is a heavy metal pollution of the advanced by the advanced technology and the advanced technology is a heavy metal chemical oxygen concentration reaction, the advanced precipitation treatment device is a, the sewage treatment device is a, the sewage treatment is a sewage treatment device is a sewage treatment is a more advanced by the advanced technology of the advanced sewage treatment system of the advanced sewage treatment system of the advanced.
Disclosure of Invention
The invention provides a device and a method for deeply treating aged landfill leachate, aiming at solving the problems that the cost for treating the aged landfill leachate is high, secondary pollution is easy to cause and a catalyst cannot be recycled in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
The utility model provides an advanced treatment old landfill leachate's device, includes coagulating sedimentation system, ozone catalytic oxidation system and MBR reaction unit, coagulating sedimentation system includes coagulating sedimentation tank, agitating unit and swash plate/pipe chute, coagulating sedimentation system connects ozone catalytic oxidation system, ozone catalytic oxidation system includes catalyst recovery unit and ozone catalytic oxidation pond, catalyst recovery unit passes through catalyst recovery union coupling ozone catalytic oxidation pond, be provided with the ozone recovery pipe on the ozone catalytic oxidation pond, MBR reaction unit is connected to ozone catalytic oxidation system.
furthermore, the coagulating sedimentation tank is in an inverted cone shape, the bottom of the coagulating sedimentation tank is connected with a sludge discharge pipe, the side wall of the coagulating sedimentation tank is provided with a flocculating agent feeding port, one end of the coagulating sedimentation tank, which is close to the stirring device, is connected with a water inlet pipe, and one end of the coagulating sedimentation tank, which is close to the inclined plate/inclined pipe, is connected with a water outlet pipe.
Furthermore, a micropore aeration device is arranged in the ozone catalytic oxidation tank, a catalyst feeding port is arranged at the upper part of the ozone catalytic oxidation tank, and an ozone inlet pipe is connected to the bottom of the ozone catalytic oxidation tank.
furthermore, one end of the ozone recovery pipe is connected with the top of the ozone catalytic oxidation pond, and the other end of the ozone recovery pipe is connected with the water inlet pipe.
Further, a magnetic field loading device is arranged at the bottom of the catalyst recovery device, and a membrane module in the MBR reaction device is a hollow fiber module or a flat plate type membrane module.
The invention also provides a processing method using the device, which comprises the following steps:
Step A, enabling the aged landfill leachate after biochemical treatment to enter a coagulating sedimentation tank through a water inlet pipe, adding a flocculating agent and a coagulant aid, stirring for 5-10 min, and standing and precipitating for 1.5-2 h;
B, the aged landfill leachate treated by the coagulating sedimentation tank enters an ozone catalytic oxidation tank, ozone is introduced, a catalyst is added, and the reaction is carried out for 30-60 min;
And step C, enabling the aged landfill leachate after the ozone catalytic reaction to enter a catalyst recovery device, adsorbing and collecting the catalyst by a magnetic field, sending the catalyst back to the ozone catalytic oxidation tank through a catalyst recovery pipe, and discharging the liquid after the liquid enters the MBR device for reaction.
Further, the catalyst is prepared by adding 5g of Cow Dung Ash (CDA) into 750mL of deionized water, introducing N 2, violently stirring for 20min, placing the solution in a water bath at 95 ℃, adding 27.81g of FeSO 4.7H 2 O and 250mL of alkaline mixed solution, reacting in the water bath for 1H, then cooling to room temperature, washing for 5 times with the aid of a magnet, drying in vacuum at 60 ℃ for 12H, and grinding to obtain the catalyst.
Further, the 250mL alkaline mixture was prepared from 8.1g NaOH and 8.1g NaNO 3 and water.
Further, the flocculant is polymeric aluminum oxide or polymeric aluminum sulfate, the coagulant aid is polyacrylamide, the mass ratio of the flocculant to COD in the aged landfill leachate to be treated is 1.5-2: 1, and the ratio of the coagulant aid to the aged landfill leachate is 1-1.5 g: 50L; the ratio of the catalyst to the aged landfill leachate is 1-2 g: 1L of
Compared with the prior art, the invention has the following beneficial effects:
1. The invention adopts the combined process of coagulating sedimentation, ozone catalysis and MBR, the COD of untreated old garbage percolate is 1000 +/-56 mg/L, the COD of old garbage percolate after passing through a coagulating sedimentation system is 800 +/-40 mg/L, the COD of old garbage percolate after passing through an ozone catalysis system is 160 +/-23 mg/L, and the COD of the finally discharged old garbage percolate is 55 +/-3 mg/L, thereby meeting the discharge standard of garbage percolate, having no concentrated solution, having simpler and more convenient process links, reducing construction land and saving investment.
2. The invention uses the magnetic catalyst, the catalyst recovery device is connected after the ozone catalyzes the effluent, the magnetic field loading device is wound at the bottom of the catalyst recovery device, the magnetic field is generated when the catalyst recovery device is electrified, the catalyst in the ozone catalysis effluent is gathered under the magnetic force at the bottom, and the recovered magnetic catalyst is introduced into the ozone catalysis reaction tank again through the pipeline at the bottom, thereby avoiding the loss of the catalyst and reducing the ozone catalysis cost.
3. according to the invention, the gas collecting pipeline is arranged at the upper part of the ozone catalytic pool, and unreacted ozone is collected and introduced into the water inlet pipeline, so that the ozone is recycled, and COD and chromaticity in the inlet water can be further reduced.
Drawings
FIG. 1 is a process flow diagram of an apparatus for advanced treatment of old landfill leachate.
FIG. 2 is a three-dimensional fluorescence spectrum of aged landfill leachate at the water inlet pipe and the water outlet of the MBR reaction device.
FIG. 3 is a distribution diagram of soluble organic components in effluent from different reaction units for treatment of old landfill leachate.
In the drawings, the reference numbers:
1 is a coagulating sedimentation tank, 2 is a stirring device, 3 is a flocculating agent feeding port, 4 is an ozone catalytic oxidation tank, 5 is a micropore aeration device, 6 is a catalyst recovery device, 7 is an MBR reaction device, 8 is a catalyst feeding port, 10 is a water inlet pipe, 11 is a sludge discharge pipe, 12 is a sedimentation tank water outlet pipe, 13 is an ozone inlet pipe, 14 is an ozone recovery pipe, and 15 is a catalyst recovery pipe.
Detailed Description
The utility model provides a device of advanced treatment old landfill leachate, as shown in figure 1, includes coagulating sedimentation system, ozone catalytic oxidation system and MBR reaction unit 7, coagulating sedimentation system includes coagulating sedimentation tank 1, agitating unit 2 and swash plate/pipe chute, swash plate/pipe chute are a set of parallel plate or square pipeline of setting in coagulating sedimentation tank 1 inside for shorten the settling time, improve precipitation efficiency. The coagulating sedimentation tank 1 is in an inverted cone shape, the bottom of the coagulating sedimentation tank is connected with a sludge discharge pipe 11, the side wall of the coagulating sedimentation tank is provided with a flocculating agent adding port 3, one end close to the stirring device 2 is connected with a water inlet pipe 10, and one end close to the inclined plate/inclined pipe is connected with a sedimentation tank water outlet pipe 12; the ozone catalytic oxidation system comprises a catalyst recovery device 6, an ozone catalytic oxidation tank 4 and a microporous aeration device 5 arranged at the bottom of the ozone catalytic oxidation tank 4, wherein the microporous aeration device 5 can improve the solubility of ozone in water, improve the mass transfer rate of ozone molecules and increase the contact chance with pollutants; sedimentation tank outlet pipe 12 is connected the bottom of ozone catalytic oxidation pond 4, 4 top one end in ozone catalytic oxidation pond is provided with the catalyst and throws with mouthful 8, the other end and be connected with ozone recovery tube 14, the catalyst is thrown with mouthful 8 and the flocculating agent and is thrown and add mouthful 3 ordinary condition under for the off-state, inlet tube 10 is connected to the other end of ozone recovery tube, ozone catalytic oxidation pond 4 bottom still is connected with ozone intake pipe 13, catalyst recovery unit 6's bottom is passed through catalyst recovery tube 15 and is connected ozone catalytic oxidation pond 4, catalyst recovery unit 6's bottom is provided with magnetic field loading device, magnetic field loading device comprises wire and the power of winding on catalyst recovery unit 6. The ozone catalytic oxidation system is connected with an MBR (membrane bioreactor) 7, and a membrane component in the MBR 7 is a hollow fiber component or a flat plate type membrane component.
The power supply of the magnetic field loading device is from Suzhou Teansi electronic Limited and has the model TD1605, the stirring device 2 adopts a Changzhou Boneng vertical planetary cycloidal pin wheel speed-reducing stirring device, and a 7.5KW and 380V motor is connected;
The preparation method of the catalyst comprises the following steps of adding 5g of Cow Dung Ash (CDA) and 750mL of deionized water into a 2L glass conical flask, introducing N 2, vigorously stirring for 20min, placing the flask in a water bath at 95 ℃, adding 27.81g of FeSO 4.7H 2 O and 250mL of mixed solution, wherein the 250mL of mixed solution is prepared from 8.1g of NaOH, 8.1g of NaNO 3 and water, reacting in the water bath for 1H, then cooling to room temperature, washing for 5 times with the aid of a magnet, and drying in vacuum at 60 ℃ for 12H to obtain the cow dung ash supported nano ferroferric oxide catalyst, and grinding for later use.
when the device is used, 100L of old landfill leachate after biochemical treatment enters a coagulative precipitation tank 1 through a water inlet pipe 10, the COD value of the effluent of the old landfill leachate after biochemical treatment is about 1000mg/L, 200g of aluminum chloride is added into the coagulative precipitation tank 1 through a flocculating agent adding port 3, 2g of Polyacrylamide (PAM) as a coagulant aid is added, a stirring device is opened, the stirring time is 10min, the materials are uniformly mixed, and then the mixture is stood for precipitation for 2 h. The sediment is discharged from the system through a sludge discharge pipe 11 at the bottom of the coagulating sedimentation tank 1; the leachate after precipitation enters an ozone catalytic oxidation tank 4 through a water outlet pipe 12 at one end of a coagulating sedimentation tank 1, 2g of the prepared cow dung ash loaded nano ferroferric oxide catalyst is added through a catalyst adding port 8, ozone is introduced, the amount of ozone is controlled to be 2-3 g/L, the reaction time is 30min, the catalyst catalyzes the decomposition of ozone to generate hydroxyl radicals, the structure of macromolecular organic matters which are difficult to degrade in the aged landfill leachate is damaged, the biodegradability of wastewater is further improved, unreacted ozone is collected and introduced into a water inlet pipe 10 through an ozone recovery pipe 14 for recycling, and the COD and the chromaticity of the aged landfill leachate can be further reduced. The reacted old garbage percolate enters a catalyst recovery device 6 through a pipeline, a power supply of a magnetic field loading device and the bottom of the catalyst recovery device 6 are turned on to form a uniform magnetic field, so that a magnetic catalyst in water is collected at the bottom, the catalyst is returned to an ozone catalytic oxidation tank 4 for cyclic utilization through a catalyst recovery pipe 15 after power failure, the old garbage percolate without the catalyst enters an MBR reaction device 7 through a pipeline, the MBR reaction device 7 in the embodiment is a hollow fiber membrane, the aperture is 0.4 mu m, pollutants are removed through aerobic biological treatment and the adsorption and interception effects of membrane components, and finally the old garbage percolate is discharged,
Old landfill leachate at a water inlet pipe 1 (group A), a water outlet of a coagulating sedimentation system (group B), a water outlet of an ozone catalytic oxidation system (group C) and a water outlet of an MBR reaction device (group D) in the embodiment is respectively detected, the detecting instrument is a Hash COD analyzer with the model of DR3900+ DRB200, and the detecting result is as follows: the COD of the group A aged landfill leachate is 1000 +/-56 mg/L, the COD of the group B aged landfill leachate is 800 +/-40 mg/L, the COD of the group C aged landfill leachate is 160 +/-23 mg/L, and the COD of the group D aged landfill leachate is 55 +/-3 mg/L.
And detecting the A, B, C, D four groups of old landfill leachate by using a Hitachi F-7000 fluorescence spectrophotometer, wherein the detection result is shown in figures 2-3, a region I in the figure represents aromatic protein I, a region II represents aromatic protein II, a region III represents ultraviolet region fulvic acid substances, a region IV represents soluble biological metabolites, and a region V represents humic substances. As can be seen from fig. 2, the fluorescence intensity of group D was gradually decreased compared to group a, the fluorescence intensity of the whole was greatly decreased, and the characteristic peaks of fulvic acid-based substances (region iii) and humic acid-based substances (region v) in the ultraviolet region were almost disappeared. As can be seen from fig. 3, the proportion of the fulvic acid substances (zone iii) and humic acid substances (zone v) in the group a in the ultraviolet region is relatively high, about 44%, and the proportion of the fulvic acid substances (zone iii) and humic acid substances (zone v) in the group D in the ultraviolet region is significantly reduced, about 19%, after the treatment by the device of the present invention.
the above-mentioned embodiments are merely preferred embodiments of the present invention, which are merely illustrative and not restrictive, and it should be understood that other embodiments may be easily made by those skilled in the art by replacing or changing the technical contents disclosed in the specification, and therefore, all changes and modifications that are made on the principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a device of old landfill leachate of advanced treatment, includes coagulating sedimentation system, ozone catalytic oxidation system and MBR reaction unit (7), its characterized in that, coagulating sedimentation system includes coagulating sedimentation tank (1), agitating unit (2) and swash plate/pipe chute, coagulating sedimentation system connects ozone catalytic oxidation system, ozone catalytic oxidation system includes catalyst recovery unit (6) and ozone catalytic oxidation pond (4), ozone catalytic oxidation pond (4) are connected through catalyst recovery pipe (15) in catalyst recovery unit (6), be provided with ozone recovery pipe (14) on ozone catalytic oxidation pond (4), MBR reaction unit (7) are connected to ozone catalytic oxidation system.
2. the device for advanced treatment of old landfill leachate according to claim 1, wherein the coagulation sedimentation tank (1) is in an inverted cone shape, the bottom of the coagulation sedimentation tank is connected with a sludge discharge pipe (11), the side wall of the coagulation sedimentation tank is provided with a flocculating agent feeding port (3), one end of the coagulation sedimentation tank close to the stirring device (2) is connected with a water inlet pipe (10), and one end of the coagulation sedimentation tank close to the inclined plate/inclined pipe is connected with a sedimentation tank water outlet pipe (12).
3. The device for advanced treatment of old landfill leachate according to claim 1, wherein the ozone catalytic oxidation tank (4) is internally provided with a microporous aeration device (5), the upper part of the ozone catalytic oxidation tank is provided with a catalyst feeding port (8), and the bottom of the ozone catalytic oxidation tank (4) is connected with an ozone inlet pipe (13).
4. the device for advanced treatment of old landfill leachate according to claim 1, wherein one end of the ozone recovery pipe (14) is connected to the top of the ozone catalytic oxidation tank (4), and the other end is connected to the water inlet pipe (10).
5. The device for advanced treatment of old landfill leachate according to claim 1, wherein the bottom of the catalyst recovery device (6) is provided with a magnetic field loading device.
6. A treatment method for deeply treating aged landfill leachate is characterized by comprising the following steps:
Step A, enabling the aged landfill leachate after biochemical treatment to enter a coagulating sedimentation tank (1) through a water inlet pipe (10), adding a flocculating agent and a coagulant aid, stirring for 5-10 min, and standing and precipitating for 1.5-2 h;
B, the aged landfill leachate treated by the coagulating sedimentation tank (1) enters an ozone catalytic oxidation tank (4), ozone is introduced, a catalyst is added, and the reaction is carried out for 30-60 min;
And step C, enabling the aged landfill leachate after the ozone catalytic reaction to enter a catalyst recovery device (6), adsorbing and collecting the catalyst by a magnetic field, sending the catalyst back to the ozone catalytic oxidation tank (4) through a catalyst recovery pipe (15), and discharging the liquid after the liquid enters an MBR device for reaction.
7. The method for advanced treatment of landfill leachate as claimed in claim 6, wherein the catalyst is prepared by adding 5g Cow Dung Ash (CDA) into 750mL of water, introducing N 2, stirring vigorously for 20min, placing the solution in a water bath at 95 ℃, adding 27.81g FeSO 4.7H 2 O and 250mL of alkaline mixture, reacting in the water bath for 1H, cooling to room temperature, washing with magnet for 5 times, vacuum drying at 60 ℃ for 12H, and grinding to obtain the catalyst.
8. The method as claimed in claim 7, wherein the 250mL alkaline mixture is prepared from 8.1g NaOH and 8.1g NaNO 3 and water.
9. The method according to claim 6, wherein the flocculant is polyaluminium oxide or polyaluminium sulfate, the coagulant aid is polyacrylamide, the mass ratio of the flocculant to COD in the aged landfill leachate to be treated is 1.5-2: 1, and the ratio of the coagulant aid to the aged landfill leachate is 1-1.5 g: 50L; the ratio of the catalyst to the aged landfill leachate is 1-2 g: 1L of the compound.
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