A treatment method for landfill leachate

Abstract

The invention discloses a treatment method of garbage leachate. The treatment method comprises the following steps: leachate in a garbage regulation pool is introduced into a leachate equalization pool; one part of effluent in the leachate equalization pool flows through an anaerobic pool to degrade organic pollutants, then enters a primary nitrification pool and a secondary nitrification pool in sequence to degrade organic pollutants and nitrify ammonia, and then enter an ultrafiltration system to obtain an ultrafiltration concentrated solution; the ultrafiltration concentrated solution flows back to the primary nitrification pool; ultrafiltration freshwater enters an ultrafiltration clear liquid tank, is introduced into an electrodialysis system to concentrate inorganic salt, and then enters a reverse osmosis system; a reverse osmosis concentrate flows back to the anaerobic pool to further degrade organic pollutants, and the reverse osmosis freshwater is discharged in compliance with the standards; meanwhile, the other part of the effluent in the leachate equalization pool is fully mixed with sludge generated by the ultrafiltration system and concentrated solution generated by the electrodialysis system in a mixing and homogenizing pool, and then enters a supercritical water oxidation system; the effluent is discharged in compliance with the standards; the generated concentrated solution is subjected to resource utilization after centrifugal dewatering. The treatment method treats a waste with another waste, and realizes the reduction and recycling of sludge.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method suitable for landfill leachate. Background technique [0002] With the rapid development of economy and society, the output of garbage produced by human production and life has already constituted a serious threat to our country's environmental conditions. According to relevant data, the total amount of garbage in our country is currently growing rapidly at a rate of 10% per year, and the untreated garbage has reached 7 billion tons. How to dispose of such a large amount of garbage has become one of the urgent problems to be solved in the 21st century in our country . At present, garbage sanitary landfill is still the main way of garbage disposal in my country, and its treatment volume accounts for about 80% of the total garbage. During the process of landfilling and stacking of garbage, various metabolites are produced due to anaerobic fermentat...

AI Technical Summary

Problems solved by technology

Although the effluent water quality of the landfill leachate after advanced membrane separation treatment is good, the membrane separation treatment also brings a by-product that is more difficult to deal with - the membrane intercepts the concentrated landfill leachate, and the generated sludge needs to be dried and filled. to bury

Since the landfill leachate is biologically treated, then separated and retained by the membrane system, and then highly concentrated, its volume generally only accounts for 30% of the volume of the sampled landfill leachate, so the membrane intercepted and concentrated landfill leachate often has a high COD concentration, which can be Low biodegradability, high content of heavy metals, high content of humic acid, etc., if not treated properly, it will cause huge environmental and ecological pollution

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