Landfill leachate treatment technology

Abstract

A landfill leachate treatment technology sequentially comprises the following steps: a landfill leachate automatically flows to an equalizing tank, and equalizing tank wastewater is pumped into a coagulative precipitation device; coagulative precipitation outlet water automatically flows to a Fenton oxidation device and undergoes a catalytic oxidation reaction; the pH value of wastewater obtained after the catalytic oxidation reaction is improved to about 10, heavy metals and iron ions in sewage are precipitated, the obtained supernatant is pumped into an ammonia nitrogen stripping tower, high-concentration ammonia nitrogen in the wastewater are stripped to a low concentration, and the pH value of the wastewater is adjusted to 7.0 to make the wastewater be suitable for biochemical treatment; the wastewater automatically flows to a two-stage A / O biochemical system; efficient composite nitrobacteria are directionally added to effectively remove ammonia nitrogen and total nitrogen; and outlet water is disinfected by ultraviolet to make various indexes reach discharge standards. The technology adopted to treat the landfill leachate has the advantages of stable reaching of discharge standards, low comprehensive investment and running cost, and no hidden trouble of secondary pollution.

Description

technical field

[0001] The invention relates to a process for treating landfill leachate. Background technique

[0002] With the rapid development of the economy and the advancement of urbanization, the amount of urban domestic waste has also increased rapidly year by year. The leachate of domestic waste landfills is the main pollution generated by landfills. Landfill leachate has the following two main characteristics: 1. 1. The concentration of organic pollutants in the leachate is high, and the COD of some leachates is as high as tens of thousands of mg / L, the chroma is relatively high, and it emits a certain odor. The ammonia nitrogen can reach several thousand mg / L, and generally contains high concentrations of heavy metals Class substances; and have a relatively high salt content, more pathogenic microorganisms. The biodegradability of landfill leachate in the middle and later stages is poor, and BOD / COD is generally in a low range. 2. The water quality changes great...

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