CN102424494B - Method for treating garbage leachate by multistage electrolysis - Google Patents
Method for treating garbage leachate by multistage electrolysis Download PDFInfo
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- CN102424494B CN102424494B CN 201110310996 CN201110310996A CN102424494B CN 102424494 B CN102424494 B CN 102424494B CN 201110310996 CN201110310996 CN 201110310996 CN 201110310996 A CN201110310996 A CN 201110310996A CN 102424494 B CN102424494 B CN 102424494B
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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/cm<2>. 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 Continuous Flow classification electrolysis treatment technique of percolate, belong to the processing technology field of oozing drop liquid, be applicable to the processing of large, medium and small type Landfill.
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 process at the scene, had improved simultaneously emission standard.This so that the difficulty of China's leachate treatment greatly improve.
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 Process for Effluent can reach emission standard.This technique exists following problem to need to solve:
1.. produce about 20% concentrated solution, be difficult to process, usually adopt the method for recharging the heap body, cause and ooze drop liquid saltiness and constantly increase, water rate reduces.
2.. the biochemical process link need increase carbon source for regulating the nutritive propss such as carbon-nitrogen 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 large.
Summary of the invention
The method that the purpose of this invention is to provide a kind for the treatment of garbage leachate by multistage electrolysis guarantees continuous removal ammonia nitrogen, reduces the garbage percolation liquid treatment method of COD.System can according to the influent ammonia nitrogen of garbage leachate, the variation of COD concentration, adjust electrolytic parameter.Adopt this technique, can solve:
1.. traditional biochemical treatment+membrane treatment process produces concentrated solution, 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 large;
4.. the large problem of biochemical processing process operation difficulty.
Technical scheme of the present invention, a kind of method for the treatment of garbage leachate by multistage electrolysis 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 carry out the electrolytic flocculation effect in first step electrolyzer, finishes the cohesion of suspended substance and colloid in the water;
2), oozing drop liquid enters from first step electrolyzer and carries out electrolytic reaction in the electrolyzer of the second stage;
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, enter 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 occur, finish the removal of ammonia nitrogen in the water and the reduction of COD; Simultaneously, the electrofloatation effect occurs also, the micro-bubble that mainly produces with negative electrode and anode is captured particulate matter and organism in the water, and rises to water surface.
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 all take the titanium net that is coated with ruthenium as anodal, take the titanium net that is coated with ruthenium or stainless (steel) wire as negative pole.Electrolyzer is all take pulse dc power as working power, and all is constant-potential electrolysis, and the voltage of electrolyzer increases from the first step to the last step successively, and the voltage-regulation scope is: 2v-10v.Current density increases to the last step electrolyzer successively from first step electrolyzer, current density range: 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 the ammonia nitrogen in the garbage leachate and reduce COD concentration in the garbage leachate.
The method for the treatment of garbage leachate by multistage electrolysis of the present invention, its constructional feature is:
Described electrolyzer is square, oozes drop liquid and enters from the bottom, from the top water outlet.The water outlet of first step electrolyzer connects the water inlet of second stage electrolyzer, the like.Negative electrode and plate spacing are less than or equal to 1cm.
The present invention is characterised in that:
1.. remove ammonia-state nitrogen and the nitric nitrogen that oozes in the drop liquid by electrolytic oxidation;
2.. ooze drop liquid VOC concentration by the electrofloatation reduction;
3.. reduce COD by electrolytic oxidation and electrolytic flocculation;
4.. reduce COD by chemical oxidation;
5.. pass 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 concentrated solution, water rate is high;
3.. the ability of opposing water inlet impact load is strong.The present invention can according to the variation of influent concentration, regulate electrolytic parameter;
4.. present technique can independently be used, and also can be used as pre-treatment or the advanced treatment process of biochemical treatment, film (reverse osmosis, nanofiltration), MVR treatment process;
5.. floor space is little, saves the soil.
The present invention replaces traditional organic method of increase to adjust carbon-nitrogen ratio by the method that directly reduces ammonia nitrogen concentration, becoming the small molecules easily biodegradable organics by 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 concentrated solution.
The present invention can be widely used in adopting the processing of the large, medium and small type landfill yard garbage leachate of Continuous Flow.
Description of drawings
Fig. 1 is the workflow diagram for the treatment of garbage leachate by multistage electrolysis.
Embodiment
Following examples arrange respectively take pulse dc power as working power, and electrode is all take the titanium net that is coated with ruthenium as positive and negative electrode.Ooze drop liquid stoste and enter the first electrolyzer from the first bottom of electrolytic tank, carrying out electrolytic flocculation processes, the precipitation that flocculation obtains enters landfill yard, after the first electrolyzer top water outlet, enter the second electrolyzer (bottom water inlet), after the second electrolyzer top water outlet, enter the 3rd electrolyzer (bottom water inlet), then after the 3rd electrolyzer top water outlet, also can enter reaction tank, add hydrogen peroxide oxidation, leave standstill final outflow water after 2 hours.In electrolytic process, according to influent concentration adjustable solution parameter, to guarantee the electrolysis effluent quality.Negative electrode and plate spacing are less than or equal to 1cm.Its workflow diagram is seen Fig. 1.
Embodiment 1:
With the inventive method treating refuse Landfill stoste, it is 2775mg/L that the former water of waste water contains ammonia nitrogen concentration, and COD concentration is 13790mg/L.The voltage that the first electrolyzer is set is 4.5V, polar plate spacing 1cm, and the electrolysis treatment time is 30min, and the 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%, COD and reaches 80%.
Embodiment 2:
With the inventive method treating refuse Landfill stoste, it is 2831mg/L that the former water of waste water contains ammonia nitrogen concentration, and COD concentration is 2668mg/L.The voltage that the first electrolyzer is set is 5.5V, and the electrolysis treatment time is 20min, and the 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%, COD and reaches 66%.
Embodiment 3:
With the inventive method treating refuse Landfill stoste, it is 1304mg/L that the former water of waste water contains ammonia nitrogen concentration, and COD concentration is 22570mg/L.The voltage that the first electrolyzer is set is 4V, and the electrolysis treatment time is 50min, and the 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%, COD and reaches 75%.The oxidizer hydrogen peroxide is further removed COD, and hydrogen peroxide concentration is that 25%, COD clearance reaches 74%.The total clearance of COD reaches more than 93%.
Claims (6)
1. the method for a treating garbage leachate by multistage electrolysis 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 carry out the electrolytic flocculation effect in first step electrolyzer, finishes the cohesion of suspended substance and colloid in the water;
2), ooze drop liquid and from first step electrolyzer, enter and carry out electrolytic reaction in the electrolyzer of the second stage, ooze drop liquid in step 2) electrolyzer in, electrolytic oxidation or reduction reaction occur, finish the removal of ammonia nitrogen in the water and the reduction of COD; Simultaneously, the electrofloatation effect occurs also, the micro-bubble that mainly produces with negative electrode and anode is captured particulate matter and organism in the water, and rises to water surface;
The electrode of electrolyzer is all take the titanium net that is coated with ruthenium as anodal, take the titanium net that is coated with ruthenium or stainless (steel) wire as negative pole; Electrolyzer is all take pulse dc power as working power, and all is constant-potential electrolysis, and the voltage of electrolyzer increases from the first step to the last step successively, and the voltage-regulation scope is: 2v-10v; Current density increases to the last step electrolyzer successively from first step electrolyzer, current density range: 60-470mA/cm
2
2. according to the method for a kind for the treatment of garbage leachate by multistage electrolysis 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 enter from the electrolyzer of the second stage in the 3rd electrolyzer, the electrolytic oxidation reduction is removed remaining ammonia nitrogen and is further reduced COD.
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 enter from the bottom, from the top water outlet; Negative electrode and plate spacing are less than or equal to 1cm.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| CN108083570B (en) * | 2017-12-21 | 2021-08-17 | 浙江创伟竹业开发有限公司 | Method for treating waste liquid from heat treatment of bamboo wood |
| 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 |
| 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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| CN1579966A (en) * | 2004-04-08 | 2005-02-16 | 同济大学 | Deep treating method of sewage, such as percolate for urban refuse filling area |
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