Method for deeply purifying landfill leachate

Abstract

The invention discloses a method for deeply purifying landfill leachate. The method comprises the following steps: 1, conveying the landfill leachate to a coagulative precipitation tank, continuouslystirring, adding a compound coagulative precipitation agent, uniformly mixing, stirring, naturally settling, and taking the supernatant; 2, separating ammonia nitrogen in the wastewater obtained in the step 1 by using a gas stripping method, and introducing ammonia nitrogen into acid to recover ammonia nitrogen; 3, conveying the wastewater obtained in the step 2 to a first degradation tank, and adding an oxidant and a first decomposition accelerator; 4, conveying the wastewater obtained in the step 3 to a second degradation tank, and adding an oxidant and a second decomposition accelerator; and 5, conveying the wastewater obtained in the step 4 to a biochemical reaction tank, and treating for 12-48 hours under a facultative condition. The effluent of the water body subjected to deep purification treatment in the steps can be directly discharged after reaching the standard. The treatment method organically combines precipitation-ammonia nitrogen recovery, deep decomposition, biochemicalnitrogen and phosphorus removal and other treatment units, and has the advantages of high treatment efficiency, mild treatment conditions and excellent treatment effect.

Description

technical field [0001] The invention relates to a method for deep purification treatment of landfill leachate, belonging to the technical field of sewage purification treatment. Background technique [0002] With the rapid development of the economy and the continuous improvement of living standards, domestic garbage and industrial solid waste have also increased sharply, and the resulting landfill leachate has become increasingly harmful to the environment. Landfill leachate generally refers to high-concentration wastewater formed during the process of garbage dumping and landfilling due to fermentation, surface water and groundwater immersion, and rainfall leaching, which contains organic acids, alkanes, lipids, heterocycles, etc. Organic compounds and high concentrations of ammonia nitrogen. Landfill leachate has the characteristics of complex pollutant components, high COD value, poor biodegradability, high ammonia nitrogen content and high chroma, and is one of the int...

AI Technical Summary

Problems solved by technology

Currently common landfill leachate treatment methods include biochemical methods (anaerobic, aerobic treatment, etc.), physical methods (membrane treatment, adsorption, flocculation, etc.), chemical methods (redox, electrocatalysis, etc.) and land methods (recharge, Constructed wetlands, etc.), a single treatment method has major problems, and it is difficult to treat it efficiently and meet the emission standards required by the country

For example, biochemical methods are often inhibited because bacteria cannot adapt to the toxic substances in landfill leachate, oxidation methods cannot completely remove total nitrogen, and membrane treatment methods are too costly to treat

China Invention Patent Authorization Announcement No. CN 102701515B, CN 106348499B use electrochemical method to treat landfill leachate, China Invention Patent Authorization Announcement No. CN 106045058B, CN 102774926B use photocatalytic method to treat landfill leachate, China Invention Patent Authorization Announcement No. CN 104876363B8 uses high temperature The high-pressure catalytic wet oxidation method has achieved good results in the treatment of landfill leachate, but the reaction conditions of these methods are harsh, and electricity, light, or heating and pressure are required, and the process is relatively complicated.