CN102424494A - Method for treating garbage leachate by multistage electrolysis - Google Patents
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Abstract
The invention discloses a method for treating garbage leachate by multistage electrolysis, and belongs to the technical field of leachate treatment. The method comprises the following steps: performing electrocoagulation of electrolytic leachate in a first-stage electrolytic cell so as to complete the coagulation of suspended matter and colloids in water; allowing the leachate to enter a second-stage electrolytic cell from the first-stage electrolytic cell so as to perform an electrolysis reaction; or allowing the leachate to enter a third-stage electrolytic cell from the second-stage electrolytic cell so as to perform electrolytic oxidation-reduction to remove residual ammonia nitrogen and further reduce COD. Each of the electrolytic cells adopts a pulse DC power supply as a working power supply; the voltages of the electrolytic cells are orderly increased from the first stage to the last stage, and the voltage adjusting range is 2 V-10 V. The current densities are orderly increased from the first-stage electrolytic cell to the last-stage electrolytic cell, and the current density range is 60-470 mA/cm2. The invention has high ammonia nitrogen removing efficiency, does not generate concentrated liquor, and has a high effluent rate.
Description
Technical field
The present invention relates to a kind of even flow classification electrolysis treatment technology of percolate, belong to the processing technology field of oozing drop liquid, be applicable to that large, medium and small type landfill yard oozes the processing of drop liquid.
Background technology
China is a lack of water country; Attach great importance to water resources protection work; Chinese Ministry of Environmental Protection had revised " household refuse landfill sites Pollution control technology standard " (GB16889-2008) in 2008, had stipulated that waste landfill site leachate must handle at the scene, had improved emission standard simultaneously.This difficulty that makes that the processing of drop liquid is oozed in China improves greatly.
Garbage leachate has the characteristics of high ammonia nitrogen, high organism, supersalinity.At present, China's leachate processing technique commonly used is biochemical treatment+membrane treatment process, and this technology water outlet can reach emission standard.This technology exists following problem to need to solve:
1.. produce about 20% liquid concentrator, be difficult to handle, adopt the method for recharging the heap body usually, cause and ooze drop liquid saltiness and constantly increase, water rate reduces.
2.. the biochemical process link need increase carbon source for regulating nutritive propss such as C/N ratio, needs in nanofiltration and the ro treatment technology to add chemical reagent, has artificially increased pollutant load.
3.. biochemical processing process operation difficulty is big.
Summary of the invention
The purpose of this invention is to provide the method that drop liquid is oozed in the treating refuse of a kind of classification electrolytic process, guarantee the garbage percolation liquid treatment method of successive removal ammonia nitrogen, reduction COD.System can be according to the influent ammonia nitrogen of garbage leachate, the variation of COD concentration, the adjustment electrolytic parameter.Adopt this technology, can solve:
1.. traditional biochemical treatment+membrane treatment process produces liquid concentrator, does not reduce the problem of pollution load;
2.. need in biochemistry, nanofiltration and the ro treatment technology to add chemical substance, reagent, artificially increase the problem of pollutant load;
3.. the problem that traditional biochemical treatment+the membrane treatment process floor space is big;
4.. the big problem of biochemical processing process operation difficulty.
Technical scheme of the present invention, the method that drop liquid is oozed in the treating refuse of a kind of classification electrolytic process is characterized in that, adopts two-stage or three grades of electrolyzers to carry out electrolysis and oozes drop liquid, may further comprise the steps:
1), electrolysis is oozed drop liquid and in first step electrolyzer, is carried out the electrolytic flocculation effect, accomplishes suspended substance and colloidal cohesion in the water;
2), oozing drop liquid gets in the electrolyzer of the second stage from first step electrolyzer and carries out electrolytic reaction;
If the ammonia nitrogen starting point concentration is too high, then need increase the one-level electrolyzer, to ooze drop liquid and from the electrolyzer of the second stage, get in the 3rd electrolyzer, the electrolytic oxidation reduction is removed remaining ammonia nitrogen and is further reduced COD.
Ooze drop liquid in step 2) electrolyzer in, electrolytic oxidation or reduction reaction take place, accomplish the removal of ammonia nitrogen in the water and the reduction of COD; Simultaneously, the electrofloatation effect takes place also, the micro-bubble that mainly produces with negative electrode and anode is captured PM for particulate matter and organism in the water, and rises to WS.
In step 2) in the water outlet of last step electrolyzer also can add hydrogen peroxide oxidant, with further reduction COD.
The electrode of electrolyzer of the present invention is a positive pole with the titanium net that is coated with ruthenium all, is negative pole with titanium net or the stainless (steel) wire that is coated with ruthenium.Electrolyzer all is working power with the pulse dc power, and all is constant-potential electrolysis, and the voltage of electrolyzer from the first step to the end one-level increase successively, the VR scope is: 2v-10v.Current density from first step electrolyzer to the end the one-level electrolyzer increase current density range successively: 60-470mA/cm
2First step electrolyzer hydraulic detention time is 15min at least, and second stage electrolyzer is 10min at least, and third stage electrolyzer is 5min at least.
According to ammonia nitrogen in the garbage leachate and COD concentration, adopt 2 or 3 electrolyzers respectively electrolysis remove ammonia nitrogen and the COD concentration that reduces in the garbage leachate in the garbage leachate.
The method that drop liquid is oozed in classification electrolytic process of the present invention treating refuse, its constructional feature is:
Said electrolyzer is square, oozes drop liquid and gets into from the bottom, the water outlet from the top.The water outlet of first step electrolyzer connects the water inlet of second stage electrolyzer, and the like.Negative electrode and plate spacing are smaller or equal to 1cm.
The present invention is characterised in that:
1.. ooze ammonia-state nitrogen and the nitric nitrogen in the drop liquid through the electrolytic oxidation removal;
2.. ooze drop liquid VOC concentration through the electrofloatation reduction;
3.. reduce COD through electrolytic oxidation and electrolytic flocculation;
4.. reduce COD through chemical oxidation;
5.. through electrolysis process;
Advantage of the present invention:
1.. ammonia nitrogen removal efficient is high.The water outlet ammonia nitrogen satisfies " household refuse landfill sites Pollution control technology standard " emission concentration restriction (GB16889-2008) fully;
2.. do not add the chemical reagent that pollutant load is increased, do not produce liquid concentrator, water rate is high;
3.. the ability of opposing water inlet impact load is strong.The present invention can regulate electrolytic parameter according to the variation of influent concentration;
4.. present technique can independently be used, and also can be used as the pre-treatment or the advanced treatment process of biochemical treatment, film (r-o-, nanofiltration), MVR treatment process;
5.. floor space is little, saves the soil.
The present invention replaces traditional organic method of increase to adjust C/N ratio through the method that directly reduces ammonia nitrogen concentration; Becoming the small molecules easily biodegradable organics through the macromole hardly degraded organic substance increases and oozes drop liquid biodegradability; Reduce the amount of reagent of biochemical treatment, can be used as the preprocessing process of biochemical treatment.The present invention can be directly as the pre-treatment of membrane treatment process.The present invention can be used as the aftertreatment technology of membrane treatment process liquid concentrator.
The present invention can be widely used in adopting the processing of the large, medium and small type landfill yard garbage leachate of even flow.
Description of drawings
Fig. 1 is the workflow diagram that drop liquid is oozed in the treating refuse of classification electrolytic process.
Embodiment
It is working power that following examples are provided with respectively with the pulse dc power, and electrode is a positive and negative electrode with the titanium net that is coated with ruthenium all.Ooze drop liquid stoste and get into first electrolyzer from first bottom of electrolytic tank; Carry out electrolytic flocculation and handle, the deposition that flocculation obtains gets into landfill yard, after the first electrolyzer top water outlet, gets into second electrolyzer (bottom water inlet); After the second electrolyzer top water outlet, get into the 3rd electrolyzer (bottom water inlet); After the 3rd electrolyzer top water outlet, also can get into reaction tank then, add hydrogen peroxide oxidation, leave standstill final outflow water after 2 hours.In electrolytic process, according to influent concentration adjustable electrolysis parameter, to guarantee the electrolysis effluent quality.Negative electrode and plate spacing are smaller or equal to 1cm.Its workflow diagram is seen Fig. 1.
Embodiment 1:
Ooze drop liquid stoste with the inventive method treating refuse landfill yard, it is 2775mg/L that the former water of waste water contains ammonia nitrogen concentration, and COD concentration is 13790mg/L.The voltage that first electrolyzer is set is 4.5V, polar plate spacing 1cm, and the electrolysis treatment time is 30min, and second bath voltage is 5.5V, and the electrolysis treatment time is 30min, and the 3rd bath voltage is 6.5V, the electrolysis treatment time is 15min.First, second electrolytic bath electrode plate spacing 1cm, the 3rd electrolytic bath electrode plate spacing 0.5cm, experimental result, ammonia nitrogen removal frank reaches 98%, and COD reaches 80%.
Embodiment 2:
Ooze drop liquid stoste with the inventive method treating refuse landfill yard, it is 2831mg/L that the former water of waste water contains ammonia nitrogen concentration, and COD concentration is 2668mg/L.The voltage that first electrolyzer is set is 5.5V, and the electrolysis treatment time is 20min, and second bath voltage is 6.5V, and the electrolysis treatment time is 10min, first, second electrolytic bath electrode plate spacing 1cm.Experimental result, ammonia nitrogen removal frank reaches 99%, and COD reaches 66%.
Embodiment 3:
Ooze drop liquid stoste with the inventive method treating refuse landfill yard, it is 1304mg/L that the former water of waste water contains ammonia nitrogen concentration, and COD concentration is 22570mg/L.The voltage that first electrolyzer is set is 4V, and the electrolysis treatment time is 50min, and second bath voltage is 5V, and the electrolysis treatment time is 50min, first, second electrolytic bath electrode plate spacing 1cm.Experimental result, ammonia nitrogen removal frank reaches 99.7%, and COD reaches 75%.The oxidizer ydrogen peroxide 50 is further removed COD, and hydrogen peroxide concentration is 25%, and the COD clearance reaches 74%.The total clearance of COD reaches more than 93%.
Claims (6)
1. the classification electrolytic process treating refuse method of oozing drop liquid is characterized in that, adopts the two-stage electrolyzer to carry out electrolysis and oozes drop liquid, may further comprise the steps:
1), electrolysis is oozed drop liquid and in first step electrolyzer, is carried out the electrolytic flocculation effect, accomplishes suspended substance and colloidal cohesion in the water;
2), ooze drop liquid and from first step electrolyzer, get in the electrolyzer of the second stage and carry out electrolytic reaction, ooze drop liquid in step 2) electrolyzer in, electrolytic oxidation or reduction reaction take place, accomplish the removal of ammonia nitrogen in the water and the reduction of COD; Simultaneously, the electrofloatation effect takes place also, the micro-bubble that mainly produces with negative electrode and anode is captured PM for particulate matter and organism in the water, and rises to WS;
The electrode of electrolyzer is a positive pole with the titanium net that is coated with ruthenium all, is negative pole with titanium net or the stainless (steel) wire that is coated with ruthenium; Electrolyzer all is working power with the pulse dc power, and all is constant-potential electrolysis, and the voltage of electrolyzer from the first step to the end one-level increase successively, the VR scope is: 2v-10v; Current density from first step electrolyzer to the end the one-level electrolyzer increase current density range successively: 60-470mA/cm
2
2. the method for oozing drop liquid according to a kind of classification electrolytic process treating refuse of claim 1; It is characterized in that; Adopt three grades of electrolyzers to carry out electrolysis and ooze drop liquid; In step 2) in increase the one-level electrolyzer, ooze drop liquid and from the electrolyzer of the second stage, get in the 3rd electrolyzer, remaining ammonia nitrogen and further reduction COD are removed in the electrolytic oxidation reduction.
3. according to the method for claim 1 or 2, it is characterized in that, in step 2) in the water outlet of last step electrolyzer also can add hydrogen peroxide oxidant, with further reduction COD.
4. according to the method for claim 1, it is characterized in that first step electrolyzer hydraulic detention time is 15min at least, second stage electrolyzer hydraulic detention time is 10min at least.
5. according to the method for claim 2, it is characterized in that first step electrolyzer hydraulic detention time is 15min at least, second stage electrolyzer hydraulic detention time is 10min at least, and third stage electrolyzer hydraulic detention time is 5min at least.
6. according to the method for claim 1, it is characterized in that electrolyzer is square, ooze drop liquid and get into, water outlet from the top from the bottom; Negative electrode and plate spacing are smaller or equal to 1cm.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103130364A (en) * | 2013-03-18 | 2013-06-05 | 中国水电顾问集团中南勘测设计研究院 | Combined electrochemical reactor for heavy metal wastewater treatment and treatment method thereof |
| CN103351073A (en) * | 2013-06-09 | 2013-10-16 | 浙江工商大学 | Device and method for processing chemical wastewater with salinity higher than 10% |
| CN103663834A (en) * | 2013-12-06 | 2014-03-26 | 南京万德斯环保科技有限公司 | Treating method for landfill leachate |
| CN104609612A (en) * | 2014-12-12 | 2015-05-13 | 叶舒帆 | Landfill leachate electrochemical treatment method |
| CN106186576A (en) * | 2016-08-31 | 2016-12-07 | 南京万德斯环保科技股份有限公司 | The method of electrochemistry PROCESS FOR TREATMENT percolate |
| CN106746045A (en) * | 2016-12-09 | 2017-05-31 | 天津泰达环保有限公司 | A kind of method that tandem three-dimensional electrolysis treatment percolate concentrates liquid |
| CN108083570A (en) * | 2017-12-21 | 2018-05-29 | 浙江创伟竹业开发有限公司 | A kind of bamboo wood heat treatment spent liquor processing method |
| CN111762929A (en) * | 2020-06-24 | 2020-10-13 | 河南工学院 | Garbage penetrating fluid treatment method based on electrochemical oxidation technology |
| CN112591945A (en) * | 2020-11-11 | 2021-04-02 | 中国五环工程有限公司 | Deep electrochemical degradation tank and electrochemical sewage treatment system |
| CN113121058A (en) * | 2019-12-31 | 2021-07-16 | 中国石油化工股份有限公司 | Process method for removing nitrate nitrogen in high-salinity wastewater |
| CN115196814A (en) * | 2022-05-23 | 2022-10-18 | 陕西化工研究院有限公司 | Treatment method of landfill leachate |
| CN115784470A (en) * | 2022-12-28 | 2023-03-14 | 广东省源天工程有限公司 | Method for removing nitrate nitrogen in sewage by combining electric enhanced biological membrane |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130364A (en) * | 2013-03-18 | 2013-06-05 | 中国水电顾问集团中南勘测设计研究院 | Combined electrochemical reactor for heavy metal wastewater treatment and treatment method thereof |
| CN103130364B (en) * | 2013-03-18 | 2014-06-11 | 中国水电顾问集团中南勘测设计研究院 | Combined electrochemical reactor for heavy metal wastewater treatment and treatment method thereof |
| CN103351073A (en) * | 2013-06-09 | 2013-10-16 | 浙江工商大学 | Device and method for processing chemical wastewater with salinity higher than 10% |
| CN103351073B (en) * | 2013-06-09 | 2014-12-10 | 浙江工商大学 | Device and method for processing chemical wastewater with salinity higher than 10% |
| CN103663834A (en) * | 2013-12-06 | 2014-03-26 | 南京万德斯环保科技有限公司 | Treating method for landfill leachate |
| CN104609612A (en) * | 2014-12-12 | 2015-05-13 | 叶舒帆 | Landfill leachate electrochemical treatment method |
| CN106186576A (en) * | 2016-08-31 | 2016-12-07 | 南京万德斯环保科技股份有限公司 | The method of electrochemistry PROCESS FOR TREATMENT percolate |
| CN106746045A (en) * | 2016-12-09 | 2017-05-31 | 天津泰达环保有限公司 | A kind of method that tandem three-dimensional electrolysis treatment percolate concentrates liquid |
| CN108083570A (en) * | 2017-12-21 | 2018-05-29 | 浙江创伟竹业开发有限公司 | A kind of bamboo wood heat treatment spent liquor processing method |
| CN113121058A (en) * | 2019-12-31 | 2021-07-16 | 中国石油化工股份有限公司 | Process method for removing nitrate nitrogen in high-salinity wastewater |
| CN113121058B (en) * | 2019-12-31 | 2022-11-11 | 中国石油化工股份有限公司 | Process method for removing nitrate nitrogen in high-salinity wastewater |
| CN111762929A (en) * | 2020-06-24 | 2020-10-13 | 河南工学院 | Garbage penetrating fluid treatment method based on electrochemical oxidation technology |
| CN112591945A (en) * | 2020-11-11 | 2021-04-02 | 中国五环工程有限公司 | Deep electrochemical degradation tank and electrochemical sewage treatment system |
| CN112591945B (en) * | 2020-11-11 | 2022-06-28 | 中国五环工程有限公司 | Deep electrochemical degradation tank and electrochemical sewage treatment system |
| CN115196814A (en) * | 2022-05-23 | 2022-10-18 | 陕西化工研究院有限公司 | Treatment method of landfill leachate |
| CN115784470A (en) * | 2022-12-28 | 2023-03-14 | 广东省源天工程有限公司 | Method for removing nitrate nitrogen in sewage by combining electric enhanced biological membrane |
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