Landfill leachate treatment process based on PMVR-ZLD

Abstract

The invention belongs to the technical field of garbage wastewater treatment, and particularly relates to a landfill leachate treatment process on PMVR-ZLD. The process comprises the following steps of: stock solution collection, pretreatment, preheating, evaporation separation, advanced treatment, solidification and the like. According to the invention, a coagulating sedimentation system is adopted in pretreatment, so that the problem of unstable operation of the device caused by blockage is effectively solved; an MVR forced circulation evaporation separation system is adopted to perform wastewater evaporation on a leachate, so that the problems of heat transfer coefficient reduction, energy consumption increase, evaporator blockage and shutdown are avoided; the advanced treatment systemis used for treating evaporated effluent, so that the cost is greatly reduced; by adopting a landfill leachate zero-emission treatment system, the leachate is subjected to evaporation separation, generated crystals are solidified into bricks and then subjected to landfill treatment, the quality of inflow water is not affected, and the landfill leachate zero-emission treatment system has more advantages compared with a concentration recharge mode adopted for leachate wastewater treatment at present.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, in particular to a process for treating landfill leachate based on PMVR-ZLD. Background technique [0002] Landfill leachate is the sewage produced in the landfill area during the landfill process, and also includes car washing wastewater and road flushing wastewater. There are many factors that affect the amount of leachate produced, among which the landfill leachate is mainly The source is rainfall infiltration, in addition to the moisture contained in the garbage itself and the waste liquid produced by anaerobic decomposition, and the landfill life, garbage compaction, garbage properties, pore water content of the garbage pile, atmospheric evaporation, whether there is Groundwater infiltration will have a certain impact on the amount of leachate. [0003] The water quality of landfill leachate is quite complex, generally containing high concentrations of COD, heavy metal salts, ...

AI Technical Summary

Problems solved by technology

[0021] In order to overcome the many problems in the landfill leachate treatment process, such as the inability to evaporate, concentrate and crystallize the waste water to produce salt, so that it cannot be solidified into bricks and then landfilled, which affects the quality of the influent water. In addition, there is still energy high consumption, low efficiency, high cost, unsafe operation, and low online rate, the present invention provides a PMVR-ZLD-based landfill leachate treatment process, which is capable of evaporating, concentrating, crystallizing and producing salt from waste water, effectively addressing the problems of Scaling and reduce system energy consumption, reduce operating costs, safe and reliable operation, high online rate, good operability and operational flexibility

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