Processing method for domestic garbage leachate

Abstract

The invention discloses a treatment method of domestic landfill leachate, the treatment method comprises the following steps: the landfill leachate is fully regulated in a regulation tank and then pre-treated; part of ammonia stripping is firstly carried out, then the anaerobic treatment and the aerobic treatment are carried out; sewage after the aerobic treatment enters an MBR membrane biological reaction tank; the sewage is treated by an MBR membrane in the MBR membrane biological reaction tank; the outlet water after the MBR membrane treatment undergoes the deep (ultrafiltration, nanofiltration) treatment; the nanofiltration concentrated water enters a high efficient evaporator for the treatment, the discharge of the clean water after the treatment by the high efficient evaporator is up to the standards, the remaining small amount of residual liquid is returned to a circulating stripping tank for the treatment, and the remaining sludge residues are outward transported after the concentration and dehydration. As the concentrated water after the deep treatment is further treated through the high efficient evaporation method, the vast majority of the water in the concentrated water is evaporated to carry out the qualified discharge, and the remaining very small amount of residual liquid after the evaporation is further returned to the circulating treatment process.

Description

technical field [0001] The invention relates to a domestic garbage treatment technology, in particular to a treatment method for domestic garbage leachate. Background technique [0002] 1. Generation of domestic waste leachate: [0003] At present, the treatment methods of urban domestic waste mainly include incineration and landfill. No matter which method is used to treat waste, landfill leachate will be produced. Compared with urban domestic sewage and industrial waste water, leachate of domestic waste has a more obvious The characteristics, that is, complex composition, large and non-periodic changes in water quality and quantity, undoubtedly bring great difficulties to its effective and stable treatment. [0004] 2. Characteristics of leachate: [0005] Leachate belongs to high concentration organic wastewater. In general, the CODcr concentration range in landfill leachate is 20000-70000mg / L, the biological oxygen demand BOD5 concentration range is 10000-40000mg / L, t...

AI Technical Summary

Problems solved by technology

[0016] (1) After the sewage is fully regulated in the regulating tank, the pretreatment step is carried out. This pretreatment step does not fully consider the heavy metal components contained in the municipal waste, and does not consider the chemical reaction to remove the heavy metal components;

[0017] (2) Before biochemical treatment, the high concentration of ammonia nitrogen in the water quality was not considered harmful to microorganisms, and measures to remove ammonia nitrogen were not adopted;

[0018] (3) Due to the high concentration of SS in the water quality, the consumption of dissolved oxygen by sludge is not considered between the anaerobic, anoxic and aerobic treatments, which greatly reduces the effective utilization rate of oxygen in the aerobic pool

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