Energy-saving environmentally-friendly treatment method for sewage in power generation system

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to an energy-saving environmentally-friendly treatment method for sewage in a power generation system. Aiming at the prior art that in the treatment process of landfill leachate, more incineration equipment is required, and combustion heat cannot be effectively utilized, the invention provides the following technical solution: [1] performing primary sedimentation to remove suspended matter; [2] allowing an influent water quantity and influent water quality to be uniform respectively by utilizing a quantity homogenizing tank and a quality homogenizing tank; [3] performing an anaerobic reaction in an anaerobic reaction tank, collecting biogas generated by the anaerobic reaction, introducing the biogas into an incinerator, and performing incineration to generate a high-temperature flue gas; [4] performing nitrification: performing denitrification treatment; [5] performing a membrane biological reaction: performing solid-liquid separation, and performing a biochemical reaction on the sewage; [6] performing nanofiltration: performing nanofiltration to further remove macromolecular organic matter and high-valent charged ions in water to obtain a treated clear liquid; and [7] performing incineration on sludge: collecting the sludge produced in each step, performing uniform preheating and drying, sending the dried sludge to an incinerator, and performing incineration. The method provided by the invention is applicable to treatment of the landfill leachate.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an energy-saving and environment-friendly sewage treatment method in a power generation system. Background technique [0002] A large amount of landfill leachate will be produced in waste incineration for power generation. Landfill leachate is a black or yellowish-brown liquid with a foul smell, and the leachate contains a large amount of organic and inorganic substances. Due to the complexity of the components in the garbage, one of the characteristics of the water quality of landfill leachate is that the content of pollutants is very high, and it often contains biological toxicity. Among them, the mass concentration of COD can be as high as 20000mg / L or more, including benzene and its various derivatives. The mass concentration of ammonia nitrogen can reach 2000mg / L. This kind of wastewater containing toxic organic matter and high ammonia nitrogen has ...

AI Technical Summary

Problems solved by technology

[0004] In view of the existing technology, the sludge and biogas produced by landfill leachate treatment are incinerated separately, which requires more incineration equipment, and the water content of the sludge is high, the calorific value generated by combustion is low, and the combustion heat cannot be effectively utilized. problem, the present invention provides an energy-saving and environmentally friendly sewage treatment method in a power generation system, the purpose of which is to: improve the incineration process in the process of landfill leachate treatment, simplify the equipment for incineration treatment, and improve the utilization efficiency of heat