Method for performing electrochemical advanced treatment on landfill leachate based on ultraviolet reinforcement

A technology of advanced treatment and ultraviolet light, which is applied in the direction of chemical instruments and methods, light water/sewage treatment, water/sewage treatment, etc., to achieve the effect of cost saving, compact equipment and easy operation

Inactive Publication Date: 2010-06-16
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

However, for the refractory organic matter and high concentration of NH in the leachate 3 -N, can only use physical and chemical methods for advanced treatment to meet the national emission standards

Method used

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  • Method for performing electrochemical advanced treatment on landfill leachate based on ultraviolet reinforcement

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Experimental program
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Effect test

Embodiment 1

[0023] Take the effluent from a landfill leachate in Beijing after anaerobic, aerobic and coagulation treatment. The effluent quality: COD 560mg L -1 , TOC 190mg L -1 , NH 3 -N 700mg L -1 , pH 7.8, conductivity 14.74mS cm -1 , chloride ion concentration 4500mgL -1 .

[0024] with RuO 2 / Ti is the anode, the current density is 50mA cm -2 , treated by electrochemical method for 90 minutes, the TOC removal rate was 26.5%, NH 3 -N removal rate was 72.7%, COD removal rate was 41.1%; after treatment for 120 minutes, TOC removal rate was 48.4%, NH 3 -N removal rate is close to 100%, and COD removal rate is 58.1%.

[0025] with RuO 2 / Ti is the anode, the current density is 50mA cm -2 , introduced a 10W low-pressure mercury lamp, and treated with ultraviolet light-enhanced electrochemical method for 90 minutes, the removal rate of TOC was 45.2%, and the removal rate of NH 3 -N removal rate reached 99.2%, COD removal rate was 54.8%; after treatment for 120 minutes, TOC remov...

Embodiment 2

[0027] Take the leachate from a landfill site, and after anaerobic and aerobic treatment, the effluent water quality: COD 1400mg L -1 , NH 3 -N 1250mgL -1 , conductivity 21.5mS cm -1 , chloride ion concentration 5800mg L -1 .

[0028] with RuO 2 / Ti is the anode, the current density is 50mA cm -2 , 10W low-pressure mercury lamp as light source, electrochemical method for 120 minutes, NH 3 -N removal rate reached 80%, COD removal rate was 31.2%; after 180 minutes of treatment, NH 3 -N removal rate is close to 100%, COD removal rate is 71.9%; after 210 minutes of treatment, NH 3 -N removal rate is close to 100%, and COD removal rate is 75.9%.

[0029] with RuO 2 / Ti is the anode, the current density is 50mA cm -2 , 10W low-pressure mercury lamp as the light source, treated with ultraviolet light-enhanced electrochemical method for 120 minutes, NH 3 -N removal rate reached 88.6%, COD removal rate was 36.3%; after 180 minutes of treatment, NH 3 -N removal rate is close...

Embodiment 3

[0031] Ammonia nitrogen simulated wastewater, initial concentration 700mg L -1 (calculated as nitrogen), pH 5.7, chlorine concentration is 5325mg L -1 , with a current density of 40mA cm -2 , processed for 90 minutes.

[0032] with RuO 2 / Ti is the anode, and the concentration of ammonia nitrogen in the effluent treated by electrochemical method is 264mg L -1 , the removal rate was 62.3%; the concentration of ammonia nitrogen in the effluent treated by the ultraviolet light-enhanced electrochemical method was below the detection limit, and the removal rate was close to 100%.

[0033] to IrO 2 / Ti is the anode, and the concentration of ammonia nitrogen in the effluent treated by electrochemical method is 284mg L -1, the removal rate was 59.4%; the concentration of ammonia nitrogen in the effluent treated by ultraviolet light enhanced electrochemical method was below the detection limit, and the removal rate was close to 100%.

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Abstract

The invention relates to a method for performing electromechanical advanced treatment on landfill leachate containing high-concentration chloride ions based on ultraviolet reinforcement, which belongs to the field of water treatment application. In the method, the biochemical effluent of the landfill leachate is taken as an advanced treatment object; an electrochemical indirect oxidation function (active chlorine produced from the high-concentration chloride ions in the leachate under an electrochemical function serves as a main oxidized group) is mainly utilized; and simultaneously, the active chlorine produced by performing in-situ electrochemistry is subjected to in-situ photodecomposition by introducing ultraviolet light, thereby producing a hydroxyl group, a chlorine free radical and the like with stronger oxidation capacity. The method has the advantages of accelerating reaction rate, simultaneously improving effect on the reduction of the chromaticity of the leachate and the removal of difficultly-degraded organic substances and ammonia nitrogen, so that the treated effluent can reach a set discharge standard.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a high-efficiency treatment technology for waste water treatment. The combination of this method and the biochemical treatment method can make up for the shortcomings in the biochemical treatment process. At the same time, as an important link in the advanced treatment of landfill leachate, this method can further treat biochemical refractory organic pollutants and ammonia nitrogen in landfill leachate at the same time. , which can make its effluent meet the discharge requirements of national standards. technical background [0002] The harmless disposal of municipal waste is becoming more and more important. Municipal waste disposal methods mainly include incineration, composting and landfill. Among them, the sanitary landfill method of garbage is used in more than 70% of my country because of its low cost, relatively simple technology, and rapid treatment. However, la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/461
Inventor 曲久辉肖书虎侯一宁刘会娟赵旭
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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