CN109231656A - A kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate - Google Patents
A kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate Download PDFInfo
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- 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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- 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
- C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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Abstract
The invention discloses a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate.The technique is the following steps are included: (1) landfill leachate first passes around grid retention suspending sundries, and then gravity flow enters conditioning tank progress water quality adjustment；(2) waste water after adjusting is promoted to electric flocculation device by elevator pump and carries out electric flocculation processing；(3) electric flocculation water outlet enters catalytic wet oxidation reactor progress wet oxidation reaction to remove removal organic polluter and improve wastewater biochemical；(4) wet oxidation water outlet enters biochemical system progress biochemical treatment；(5) bio-chemical effluent enters membranous system progress membrane separation, produces water and reaches discharge standard outlet.The present invention organically combines catalytic wet oxidation technology into garbage leachate treatment process, landfill leachate treatment can be made to reach first discharge standard, has CODCrRemoval rate is high, advantage without secondary pollution, water resistant matter fluctuation is strong.
Description
Technical field
The invention belongs to waste water technology fields, more particularly to a kind of catalytic wet oxidation-biochemistry-of landfill leachate
Membrane treatment process.
Background technique
With the rapid development of economy and increasing substantially for living standards of the people, the rubbish generated therewith is also at multiplication
It is more.The method that the solid refuse in China mostly uses landfill or burning is handled.Rubbish is during landfill due to being compacted, fermenting
Equal physics, biology, chemical action, at the same generated under precipitation and the seepage effect of other external waters containing organic or inorganic at
The liquid divided is known as landfill leachate.Landfill leachate usually has change of water quality big (water quality is unstable), water quality are complicated (to contain
Contents of many kinds of heavy metal ion and ammonia nitrogen), the features such as organic concentrations are high, biodegradability is poor, periphery soil layer and underground water are easily caused
Serious pollution.Therefore, the effective Collecting and dealing of landfill leachate progress has been attracted extensive attention and urgently to be resolved, and rubbish
The processing technique of percolate also becomes international research hotspot therewith.Currently, method for treating garbage percolation liquid is main both at home and abroad
There are physico-chemical process, ozone or hydrogen peroxide oxidation, photochemical catalysis oxidation, membrane separation process and bioanalysis etc..Wherein physico-chemical process is not only transported
At high cost, the complex treatment process of row, is also easy to produce secondary pollution, and be difficult to qualified discharge, is unsuitable for the place of a large amount of landfill leachates
Reason；Independent ozone or hydrogen peroxide oxidation and photochemical catalysis oxidative treatment are at high cost and be difficult to make discharged wastewater met the national standard；Film point
It can make discharged wastewater met the national standard from method but there are problems that concentrate can not be handled；Bioanalysis is although energy-efficient, can remove simultaneously
Organic matter and ammonia nitrogen in landfill leachate, but the landfill leachate of high-enriched organics, high salinity cannot be handled, and be difficult to
Reach discharge standard.
The very strong water quality and quantity impact load of percolate cannot be born in many processing units of operation at present, operation is not
Stablize, treatment effeciency is low.Therefore, seek a kind of processing method not limited by landfill leachate water quality characteristic, become domestic and international
The most important thing of landfill leachate treatment.
Chinese invention patent CN1209304C uses " landfill leachate-grid-conditioning tank-electrolytic oxidation-ceramic membrane filter
The group technology of machine-membrane bioreactor (MBR)-reverse osmosis (RO)-qualified discharge ", wastewater treatment qualified discharge, concentrate are adopted
With recharge processing or evaporation and concentration processing, concentrate is only minimizing by being concentrated by evaporation processing, does not carry out substance
The problem of handling, still remaining concentrate.
Chinese invention patent CN102583908B is using " catalysis oxidation pre-processes-biochemical treatment-deep oxidation and more
The materialization group technology of the secondary biochemical treatment-activated carbon adsorption of media filtration-", wastewater treatment qualified discharge, but technique is excessively
Complexity takes up a large area.
Chinese invention patent CN107698055A discloses the catalytic wet oxidation processing side of landfill leachate qualified discharge
Method, using " flocculation pretreatment+catalytic wet oxidation " treatment process route, the CODCr of landfill leachate and coloration point after processing
Not Bu Gaoyu 500mg/L and 80 times, pH be 7~9, the treatment process route is although simple to operation, but is unable to reach national mark
Quasi- GB16889-2008 " consumer waste filling and embedding contamination control standard ".
Catalytic wet oxidation technology (Catalytic Wet Air Oxidation, abbreviation CWAO) is from 70 years 20th century
What in generation, grew up, it is that catalyst is added into traditional wet oxidation reaction system, can not only reduces reaction temperature and pressure,
And improve reaction efficiency.Since catalytic wet air oxidation has, reaction condition is relatively mild, treatment effeciency is high, reaction speed
Fastly, small, applied widely, the recyclable resource of device and the advantages such as secondary pollution is low, therefore have a good application prospect.
Present invention seek to address that concentrate can not be handled in garbage leachate treatment process scheme at present, aged garbage filter
The intractable problem of liquid organically combines catalytic wet oxidation technology into garbage leachate treatment process, provides a kind of " lattice
Grid-conditioning tank-electric flocculation-catalytic wet oxidation-anaerobic/anoxic/aerobic treatment-film process " treatment process scheme, tool
The advantage for having CODCr removal rate high, without secondary pollution, water resistant matter fluctuation is strong, while keeping energy after landfill leachate treatment up to standard
Discharge.
Summary of the invention
The purpose of the present invention is to provide a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate.This hair
It is bright to organically combine catalytic wet oxidation technology into garbage leachate treatment process, landfill leachate treatment can be made to reach level-one
Discharge standard has CODCrRemoval rate is high, advantage without secondary pollution, water resistant matter fluctuation is strong.
To achieve the above object, the present invention takes following technical scheme:
A kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate, successively the following steps are included:
(1) landfill leachate first passes around grid retention suspending sundries, and then gravity flow enters conditioning tank progress water quality adjustment；
(2) waste water after adjusting is promoted to electric flocculation device by elevator pump and carries out electric flocculation processing；
(3) electric flocculation water outlet enter catalytic wet oxidation reactor carry out wet oxidation reaction with go removal organic polluter and
Improve wastewater biochemical；
(4) wet oxidation water outlet enters biochemical system progress biochemical treatment；
(5) bio-chemical effluent enters membranous system progress membrane separation, produces water and reaches discharge standard outlet.
Further, in the above-mentioned methods, for the electric flocculation device using iron plate or aluminium sheet as anode, stainless steel is cathode,
The electric flocculation reaction time is 0.01~1h, and current density is 1~50mA/cm2。
Further, in the above-mentioned methods, the catalytic wet oxidation reaction temperature is 80~270 DEG C, and reaction pressure is
0.02~8MPa, reaction time are 0.1~3h.
Further, in the above-mentioned methods, the oxidant of the catalytic wet oxidation reaction is air, oxygen, H2O2In
At least one.
Further, in the above-mentioned methods, the catalyst of the catalytic wet oxidation reaction is soluble transition metal salt
Or loaded noble metal catalyst.
Further, in the above-mentioned methods, soluble transition metal salt is selected from soluble ferric iron salt, soluble copper salt, solvable
At least one of property manganese salt, soluble nickel salt, soluble cobalt.
Further, in the above-mentioned methods, the active component of loaded noble metal catalyst is in Ru, Rh, Pt, Pd
At least one.
Further, in the above-mentioned methods, biochemical system includes anaerobic pond, anoxic pond and aerobic tank, and waste water passes sequentially through
Anaerobic pond, anoxic pond and aerobic tank carry out biochemical treatment.
Further, in the above-mentioned methods, membranous system includes that ultrafiltration membrane, nanofiltration membrane and RO reverse osmosis membrane, waste water successively lead to
Cross ultrafiltration membrane, nanofiltration membrane and RO reverse osmosis membrane processing.
Further, in the above-mentioned methods, the RO obtained after RO reverse osmosis membrane processing produces water and reaches discharge standard outlet, dense
Liquid is back to conditioning tank after the processing of pervaporation desalination, re-starts wet oxidation reaction to improve biochemical.
Further, in the above-mentioned methods, described except salt treatment process is to be concentrated by evaporation desalination, concentrate after desalination and
Condensate liquid, which re-mixes, is back to conditioning tank.
Compared with the existing technology, the present invention has the advantage that
1) treatment process combination catalytic wet oxidation technology of the present invention and conventional garbage filter processing technique can bear to seep
The very strong water quality and quantity impact load of filtrate, stable, treatment effeciency is high, and whole set process is suitble to handle the diafiltration of different phase
Liquid and it can stably reach discharge standard.
2) concentrate problem is not present in treatment process of the present invention, does not generate secondary pollution, and Wet Oxidation Process can drop hardly possible
The landfill leachate component of solution is thoroughly decomposed into CO2、H2O or other small molecule organic compounds, can be effectively reduced waste water
Toxicity, avoid Poisoning pollutant from influencing treatment effect to the inhibition of biological bacterium；
3) Wet Oxidation Process involved in treatment process of the present invention needs electric heating in the initial phase of reaction；System
A large amount of heat can be discharged when normal operation, the heat of system release can maintain the condition of high temperature of reaction system substantially, therefore anti-
System energy conservation and environmental protection is answered, operating cost is lower.
Detailed description of the invention
Fig. 1 is process flow diagram of the invention.
Specific embodiment
Following specific embodiments are the further explanations to method provided by the invention and technical solution, but are not construed as
Limitation of the present invention.
Embodiment 1
New refuse percolate, raw water COD are handled using group technology of the present inventionCr=3500~23000 mg/L, ammonia nitrogen
Value is 300~1500mg/L, and total values of nitrogen might is 1000~2500mg/L, salt content 0.5%~2.3%.
New refuse percolate treating process uses following steps:
1, after landfill leachate first passes around grid object-catching, then gravity flow enters conditioning tank.Due to landfill leachate
Water quality, water changed greatly by season and time effects, conditioning tank, which mainly passes through, concentrates larger amount of landfill leachate to make it
Homogeneous is obtained in water quality, reduces the load impact to aftertreatment systems.
2, the waste water after adjusting step 1 is promoted to electric flocculation device by elevator pump and carries out electric flocculation processing, with iron plate
For anode, reaction time 1h, current density 50mA/cm2。
3, the water outlet of step 2 electric flocculation is pumped into catalytic wet oxidation reactor by high-pressure pump and carries out wet oxidation reaction to go
Removal organic polluter and raising wastewater biochemical, 220 DEG C of reaction temperature, reaction pressure 3MPa, reaction time 1h, oxidant
For air, catalyst is support type Ru-Pt/CeO2-TiO2。
4, step 3 water outlet enters biochemical system, passes sequentially through anaerobic pond, and anoxic pond and aerobic tank carry out biochemical treatment.
5, the water outlet of step 4 enters membranous system, passes sequentially through ultrafiltration membrane, nanofiltration membrane and RO reverse osmosis membrane, it is up to standard that RO produces water
Discharge, by evaporating desalination, concentrate and condensate liquid after desalination re-mix and are back to conditioning tank dope, re-start wet type
Oxidation reaction is to improve biochemical.
The present embodiment final outflow water CODCr=20~50mg/L, ammonia nitrogen are 10~20mg/L, and total values of nitrogen might is 15~35mg/
L。
Embodiment 2
Using mature landfill leachate in group technology of the present invention processing, raw water CODCr=3000~6000 mg/L, ammonia nitrogen
Value is 1100~2300mg/L, and total values of nitrogen might is 2100~3500mg/L, salt content 1.5%~5%.
Middle mature landfill leachate treatment process uses following steps:
1, after landfill leachate first passes around grid object-catching, then gravity flow enters conditioning tank.Due to landfill leachate
Water quality, water changed greatly by season and time effects, conditioning tank, which mainly passes through, concentrates larger amount of landfill leachate to make it
Homogeneous is obtained in water quality, reduces the load impact to aftertreatment systems.
2, the waste water after adjusting step 1 is promoted to electric flocculation device by elevator pump and carries out electric flocculation processing, with iron plate
For anode, reaction time 1.5h, current density 30mA/cm2。
3, the water outlet of step 2 electric flocculation is pumped into catalytic wet oxidation reactor by high-pressure pump and carries out wet oxidation reaction to go
Removal organic polluter and raising wastewater biochemical, 120 DEG C of reaction temperature, reaction pressure is 1.5 MPa, reaction time 1h, oxygen
Agent is air and H2O2, catalyst is soluble ferric iron salt.
4, step 3 water outlet enters biochemical system, passes sequentially through anaerobic pond, and anoxic pond and aerobic tank carry out biochemical treatment.
5, the water outlet of step 4 enters membranous system, passes sequentially through ultrafiltration membrane, nanofiltration membrane and RO reverse osmosis membrane, it is up to standard that RO produces water
Discharge, by evaporating desalination, concentrate and condensate liquid after desalination re-mix and are back to conditioning tank dope, re-start wet type
Oxidation reaction is to improve biochemical.
The present embodiment final outflow water CODCr=30~50mg/L, ammonia nitrogen are 5~20mg/L, and total values of nitrogen might is 10~40mg/L.
The method of the present invention that the above embodiments are only used to help understand and its core concept.It should be pointed out that for
For those skilled in the art, without departing from the principle of the present invention, if can also be carried out to the present invention
Dry improvement and modification, these improvement and modification are also fallen into the claims in the present invention protection scope.
Claims (10)
1. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate, which comprises the following steps:
(1) landfill leachate first passes around grid retention suspending sundries, and then gravity flow enters conditioning tank progress water quality adjustment；
(2) waste water after adjusting is promoted to electric flocculation device by elevator pump and carries out electric flocculation processing；
(3) electric flocculation water outlet enters catalytic wet oxidation reactor progress wet oxidation reaction to remove removal organic polluter and raising
Wastewater biochemical；
(4) wet oxidation water outlet enters biochemical system progress biochemical treatment；
(5) bio-chemical effluent enters membranous system progress membrane separation, produces water and reaches discharge standard outlet.
2. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate according to claim 1, feature
It is, for the electric flocculation device using iron plate or aluminium sheet as anode, stainless steel is cathode, and the electric flocculation reaction time is 0.01~1h,
Current density is 1~50mA/cm2。
3. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate according to claim 1, feature
Be, the catalytic wet oxidation reaction temperature be 80~270 DEG C, reaction pressure be 0.02~8MPa, the reaction time be 0.1~
3h。
4. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate according to claim 1, feature
It is, the oxidant of the catalytic wet oxidation reaction is air, oxygen, H2O2At least one of.
5. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate according to claim 1, feature
It is, the catalyst of the catalytic wet oxidation reaction is soluble transition metal salt or loaded noble metal catalyst.
6. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate according to claim 5, feature
It is, soluble transition metal salt is selected from soluble ferric iron salt, soluble copper salt, soluble manganese salt, soluble nickel salt, soluble cobalt
At least one of salt.
7. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate according to claim 5, feature
It is, the active component of loaded noble metal catalyst is selected from least one of Ru, Rh, Pt, Pd.
8. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate according to claim 1, feature
It is, biochemical system includes anaerobic pond, anoxic pond and aerobic tank, and waste water passes sequentially through anaerobic pond, and anoxic pond and aerobic tank carry out
Biochemical treatment.
9. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate according to claim 1, feature
It is, membranous system includes ultrafiltration membrane, nanofiltration membrane and RO reverse osmosis membrane, and it is reverse osmosis that waste water passes sequentially through ultrafiltration membrane, nanofiltration membrane and RO
Film process, RO produce water and reach discharge standard outlet, and dope is back to conditioning tank after the processing of pervaporation desalination, re-starts wet type
Oxidation reaction is to improve biochemical.
10. a kind of catalytic wet oxidation-biochemistry-membrane treatment process of landfill leachate according to claim 9, feature
It is, described except salt treatment process is to be concentrated by evaporation desalination, the concentrate and condensate liquid after desalination re-mix and be back to adjusting
Pond.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110386711A (en) * | 2019-07-29 | 2019-10-29 | 宜兴国际环保城科技发展有限公司 | A kind of method of the tubular type free-radical oxidation processing of landfill leachate |
| CN111675423A (en) * | 2020-05-19 | 2020-09-18 | 四川美富特环境治理有限责任公司 | Treatment method and system for nicotinic acid medical intermediate wastewater |
| CN111689641A (en) * | 2019-03-13 | 2020-09-22 | 姜林 | Full-quantitative treatment method for landfill leachate |
| CN112723653A (en) * | 2020-12-08 | 2021-04-30 | 武汉天源环保股份有限公司 | Garbage leachate full-scale harmless treatment method and system |
| CN114368880A (en) * | 2022-01-21 | 2022-04-19 | 江苏坤奕环境技术股份有限公司 | Full-scale treatment system and method for middle and later-stage leachate of refuse landfill |
| CN115196814A (en) * | 2022-05-23 | 2022-10-18 | 陕西化工研究院有限公司 | Treatment method of landfill leachate |
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