Method and system for treating domestic sewage by using sewage water generated by desulfurization and dedusting of coal-fired boiler

Abstract

The invention discloses a method and a system for treating domestic sewage by using sewage water generated by desulfurization and dedusting of a coal-fired boiler, belonging to the range of energy-saving environment-protective wastewater comprehensive treatment technologies and equipment. The lower part of a dedusting and desulfurization tower is connected with a gray-water separation pool, the gray-water separation pool is respectively connected with a mixing pool and a circulating pool, the mixing pool is communicated with one end of a slag trough, the other end of the slag trough is connected with the circulating pool, an acidic clear water pipe is led out of the upper part of the gray-water separation pool to be connected to the circulating pool; a filter mesh is arranged in a domestic sewage reservoir; quasi-reclaimed water after the filtration enters a quasi-reclaimed water pool; and the quasi-reclaimed water pool is connected to the mixing pool. The method adopts the new concept of treating sewage by using sewage, combines the desulfurization, the dedusting, the energy conservation, the water conservation, the water treatment, the prevention of secondary pollution and the like as a whole, carries out the comprehensive treatment and forms a green environment-protective chain. The use of the method can treat hundreds of thousands of tons of various types of sewage annually, thereby realizing energy conservation, emission reduction and recycling of the sewage. The device can save the investment by more than one half, and the promotion range is wide, thereby protecting green water, blue sky and health of people.

Description

technical field [0001] The invention belongs to the scope of energy-saving and environment-friendly sewage comprehensive treatment technology and equipment, and in particular relates to a method and system for treating domestic sewage with desulfurized, dust-removed and dirty water from a coal-fired boiler. Background technique [0002] At present, coal-fired boilers are widely used for thermal power generation, heating, smelting and other industrial purposes. However, due to the high sulfur content of coal, in addition to sulfur dioxide gas, a large amount of smoke and dust are entrained in the exhausted flue gas, which is the cause of the downturn. Acid rain and inhalable particles in the air are the main causes, causing environmental pollution and making the blue sky in Beijing not blue. Moreover, Beijing discharges a large amount of domestic sewage and industrial sewage every day. Relying solely on sewage treatment plants not only has a very limited treatment capacity, b...

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Problems solved by technology

[0002] At present, coal-fired boilers are widely used for thermal power generation, heating, smelting and other industrial purposes. However, due to the high sulfur content of coal, in addition to sulfur dioxide gas, a large amount of smoke and dust are entrained in the exhausted flue gas, which is the cause of the downturn. Acid rain and the main cause of inhalable particulate matter in the air, causing environmental pollution and making the blue sky in Beijing not blue

Moreover, Beijing discharges a large amount of domestic sewage and industrial sewage every day. Relying on sewage treatment plants alone not only has a very limited treatment capacity, but also consumes a lot of energy and costs. This is one of the important reasons for Beijing's water pollution.

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