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A method for preparing alcohols by electrocatalytic reduction of landfill leachate

A technology of landfill leachate and electrocatalysis, which is applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of difficult cost control, high concentration of chemical oxygen demand, insufficient recovery of leachate resources, etc., and achieve a wide range The effect of technical scalability and adaptability

Active Publication Date: 2017-09-05
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combined treatment is a simple treatment method, which can save the high cost of building a separate leachate treatment system. However, the response to landfill leachate from different sources is not flexible enough; the essence of the recharge method is to use the landfill as a waste-based system. Biodegradation of Landfill Leachate by Filled Anaerobic Biofilter Bed
However, the recharge method cannot completely eliminate the leachate, and it is easy to lead to the accumulation of ammonia nitrogen and the increase of the concentration of chemical oxygen demand; for most urban landfill leachate, limited by various objective factors, only an independent in-field complete Treatment system, that is, adopt biochemical or physical and chemical technology to carry out advanced treatment, but currently there are few means to treat landfill leachate, and the cost is difficult to control
[0004] Patent CN201210086595.8 discloses a treatment method for landfill leachate, which includes the steps of ammonia removal, flocculation precipitation, electrolysis, capacitive desalination, anaerobic treatment, aerobic treatment, membrane filtration and membrane concentrate treatment, and the operation process is relatively cumbersome; Patent CN201210302109.1 discloses a landfill leachate treatment technology integrating lime pretreatment, gas membrane acid absorption, high-efficiency multi-stage AO biochemical treatment and modified carbon adsorption technology; The core biochemical treatment technology; patent CN201410721418.1 discloses a zero-concentrate advanced treatment system and method for landfill leachate, including flocculation, denitrification, ozone oxidation and other steps
In general, the current landfill leachate treatment process is relatively cumbersome, and the recovery of resources in the leachate is not sufficient, so it is urgent to develop a new landfill leachate treatment-reuse technology

Method used

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  • A method for preparing alcohols by electrocatalytic reduction of landfill leachate
  • A method for preparing alcohols by electrocatalytic reduction of landfill leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Steps such asfigure 1 As shown, collect the landfill leachate whose chemical oxygen demand concentration is 50000mg / L and the pH value is 3, add sodium hydroxide to adjust the pH value to 9, skim off the scum, and take the supernatant dropwise and add the mass concentration to be 10% sulfuric acid, adjust the pH value of the supernatant to 2.5; move the supernatant into a plate filter, first use filter paper to filter out large-sized particle suspensions and flocs, and then use a microfiltration membrane with a filter pore diameter of 0.45 microns Filter out micron-sized suspended particles to obtain a clarified filtrate; add sodium sulfate with a mass concentration of 5% in the clarified filtrate, if any precipitation or scum occurs, repeat the filtration until the clarified filtrate is obtained; figure 2 , the filtrate is transferred to the anode chamber 5 of the electrocatalytic reactor with the proton exchange membrane 7, and the mass concentration equal to the filt...

Embodiment 2

[0044] Landfill leachate chemical oxygen demand concentration is 22750mg / L, and pH value is 3.6, and all the other steps are identical with embodiment 1, repeat no more, the mass concentration of alcoholic organic matter in the gained product is 79%, and ester organic matter is 9%, Acidic organic matter is less than 3%.

Embodiment 3

[0046] Landfill leachate chemical oxygen demand concentration is 13125mg / L, and pH value is 4.5, and all the other steps are identical with embodiment 1, repeat no more, the mass concentration of alcoholic organic matter in the gained product is 76%, and ester organic matter is 7%, Acidic organic matter is less than 2.0%.

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Abstract

The invention relates to the field of sewage treatment and reuse, in particular to a method for preparing alcohols by electrocatalytically reducing landfill leachate. According to the characteristics of high acidity, complex components and difficult biodegradation of landfill leachate, the leachate is firstly adjusted to pH, filtered, and salted, then introduced into an electrocatalytic reactor with a proton exchange membrane, and first oxidized in the anode chamber Pretreatment to decompose organic macromolecules, remove excess residues and increase the content of organic acids, then transpose the cathode and anode, exchange the functions of the anode chamber and the cathode chamber, continue the electrocatalytic reduction, reduce the lower acid to lower alcohol, and enrich the The reaction solution containing alcohols is continuously extracted into the reboiler of the rectification column, and the acids, alcohols, esters and other organic substances contained in it are separated, and high-concentration lower alcohols are obtained in the column head. The invention has the characteristics of simple process flow, convenient maintenance, low energy consumption, high alcohol recovery efficiency, etc., and can be used for auxiliary treatment of landfill leachate and resource reuse.

Description

technical field [0001] The invention relates to the field of sewage treatment and reuse, in particular to a method for preparing alcohols by electrocatalytically reducing landfill leachate, which can simultaneously realize effective treatment of landfill leachate sewage and reuse of organic resources. Background technique [0002] With the continuous improvement of people's production and living standards, the total amount of industrial, agricultural and domestic waste is also increasing, and the harm to the environment is also increasing, and the harm of landfill leachate is particularly serious. Landfill leachate refers to a kind of high-concentration organic wastewater formed after passing through the garbage layer and the covering soil layer from the moisture contained in the garbage itself, the natural precipitation and other moisture entering the landfill in the landfill. When the water seeps through the garbage with complex components, it will cause the garbage to und...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/02C25B3/04C25B3/23C25B3/25
Inventor 殷立峰牛军峰代云容谢利利张园正
Owner BEIJING NORMAL UNIVERSITY