Comprehensive wastewater reuse treatment method for waste incineration power plant

Abstract

The invention discloses a comprehensive wastewater reuse treatment method for a waste incineration power plant. The method comprises the steps of production sewage pre-treatment, flue gas wastewater pre-treatment, domestic sewage pre-treatment, landfill leachate pre-treatment, reverse osmosis deep treatment and dehydration treatment. According to the method, landfill leachate and domestic sewage are mixed and subjected to facultative and aerobic treatment, so that COD and NH3-N in the landfill leachate can be effectively reduced, the proportion of pollutants in sewage can be balanced, the mixed liquid has good biodegradability, and the effluent quality is good; the pretreated production wastewater, the biodegraded landfill leachate and domestic sewage are subjected to combined deep treatment, and only one set of treatment device is needed, so that the investment cost is reduced; and sewage combined treatment is adopted, so that the content of COD and heavy metal ions in the sewage which enters a reverse osmosis system can be effectively reduced, the problem of reverse osmosis membrane blockage can be effectively relieved, the frequency of chemical cleaning can be reduced, and the service life of the reverse osmosis membrane can be prolonged.

Description

technical field [0001] The invention relates to a comprehensive sewage reuse treatment method for a waste incineration power plant, and belongs to the technical field of sewage treatment. Background technique [0002] In recent years, with the development of my country's cities and the improvement of the economic level, people's living standards have gradually improved, and the calorific value of municipal solid waste has gradually increased. The calorific value of the waste entering the furnace has reached 5000kJ / kg, fully meeting the conditions for incineration treatment. The operating experience of other cities in China shows that it is feasible to use incineration to deal with domestic waste, and it has considerable economic benefits. [0003] Sewage and wastewater from waste incineration power plants mainly include: garbage pit leachate, boiler effluent, circulating cooling system effluent, workshop effluent, wet flue gas treatment wastewater, domestic sewage, etc. Cur...

AI Technical Summary

Problems solved by technology

However, both landfill leachate and fecal wastewater are highly organically polluted wastewater, and the content of organic matter in the effluent after biochemical treatment is still high. If such sewage enters the reverse osmosis system, the reverse osmosis membrane will be severely clogged, the frequency of chemical cleaning will be high, and the service life of the membrane will be severe. Short and other questions

[0006] The application number is 201110443600.1 "A method for combined treatment of leachate from waste incineration plant and urban sewage", which does not solve the problem well, because the ratio of carbon, nitrogen and phosphorus in urban sewage is suitable for microbial treatment, and the carbon concentration of landfill leachate is relatively high , the concentration of ammonia nitrogen is low and lacks phosphorus, so adding landfill leachate to urban sewage will cause an imbalance in the ratio of carbon, nitrogen and phosphorus, which will seriously affect the treatment effect and make the effluent not up to standard

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