Microwave-assisted Fenton strengthened landfill leachate membrane filtration concentrated solution treatment method

Abstract

The invention discloses a microwave-assisted Fenton strengthened landfill leachate membrane filtration concentrated solution treatment method with the advantages of low cost, high treatment speed and good treatment effect. The method comprises the following steps: (1) adding a certain amount of sulfuric acid into a regulating reservoir stored with a concentrated solution until the pH value of the concentrated solution is 2.0-4.0; (2) adding an antifoaming agent into the concentrated solution for performing antifoaming treatment; (3) adding a Fenton reagent into the concentrated solution for carrying out an aeration pre-reaction; (4) feeding the concentrated solution into a microwave reactor to carry out a microwave-induced oxidizing reaction; (5) adding an alkaline substance into the concentrated solution until the pH value of the concentrated solution is 10.0; (6) carrying out an air floatation reaction on the concentrated solution so as to realize mud-water separation; (7) performing up-to-standard release on the separated effluent, and if not, feeding the filtrate into the regulating reservoir in the step (1); and (8) drying and dewatering the sludge subjected to the air floatation reaction, conveying the dried mud cake, and feeding the dried filtrate into the regulating reservoir in the step (1) to perform the repeated recycling operation.

Description

technical field [0001] The invention relates to an industrial wastewater treatment technology, in particular to a method for treating concentrated liquid of landfill leachate membrane filtration with microwave cooperation with Fenton, which has lower cost, faster treatment speed and better treatment effect. Background technique [0002] Landfill leachate membrane filtration concentrate is the concentrate (hereinafter referred to as "concentrate") produced by the landfill leachate produced by "biochemical and reverse osmosis technology". 20-25%), and contains a large amount of aromatic compounds, chlorinated aromatic compounds, phosphate esters, phenols and aniline pollutants that are difficult to biodegrade, and also contains a variety of endocrine disruptor substances, with complex components and pollutant concentrations High, high salt content, and has certain biological toxicity, poor biodegradability, black opaque suspension, belonging to refractory organic wastewater. ...

AI Technical Summary

Problems solved by technology

[0003] At present, the common treatment method of landfill leachate membrane filtration concentrate is to recharge it to landfill. The following problems exist in the application of this method: (1) The concentration of leachate pollutants is getting higher and higher, increasing the treatment of biochemical systems Difficulty; (2) The concentrated solution has high salt content, the reverse osmosis membrane is easy to clog, the membrane flux decreases rapidly, the consumables are replaced frequently, and the operating cost increases; (3) if it is not handled properly, it is easy to cause secondary pollution

If the landfill leachate is directly discharged into the environment, it will cause serious pollution to surface water and groundwater, and at the same time seriously threaten the safety of drinking water for residents.

[0004] Fenton’s reagent has a strong oxidizing ability, and has incomparable advantages over general chemical oxidation methods in the treatment of refractory organic wastewater. So far, it has been successfully used in the treatment of various industrial wastewater, but H 2 o 2 It is expensive, and it is often too expensive to use alone, so in practical applications, it is usually used in conjunction with other treatment methods for pretreatment or final advanced treatment of wastewater

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