Municipal sewage treatment system and method

Abstract

The invention discloses a municipal sewage treatment system and method. The municipal sewage treatment system comprises a strengthened pre-treatment unit, a strengthened biological treatment unit, a deep treatment unit and an energy recycling unit, wherein the strengthened pre-treatment unit is internally provided with a cellulose recycling device; the cellulose recycling device is provided with acellulose recycling opening; a municipal sewage inlet is formed in the front end of the strengthened pre-treatment unit and an outlet is formed in the rear end of the strengthened pre-treatment unit;the outlet at the rear end of the strengthened pre-treatment unit is connected with the strengthened biological treatment unit and the deep treatment unit in sequence; the deep treatment unit is provided with an up-to-standard water outlet; the strengthened biological treatment unit is internally provided with a lateral flow phosphorus recycling device; the lateral flow phosphorus recycling device is provided with a phosphorus recycling opening; the strengthened biological treatment unit is provided with a residual sludge outlet; the energy recycling unit is connected with the up-to-standardwater outlet of the deep treatment unit; the energy recycling unit is provided with a resource recycling opening and an energy recycling opening respectively. The system can meet high emission standards and also can be used for recycling resources and energy sources including phosphorus, chemical energy, heat energy, cellulose and the like in sewage.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a system and method for treating municipal sewage. Background technique [0002] In recent years, black and odorous water bodies have been raging, and my country has paid more and more attention to water pollution issues. The country has continuously improved the discharge standards of water pollutants from urban sewage treatment plants: my country's water pollution reduction targets will be based on the original COD total control. To strengthen the control of ammonia nitrogen and total phosphorus, it is clearly stated that sewage treatment plants should gradually meet the first-level A standard of GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants"; while in environmentally sensitive areas, more stringent local standards have been issued one after another. For example, the "Comprehensive Discharge Standard of Water Pollutants" (DB11 / 890-2012) issued by Be...

AI Technical Summary

Problems solved by technology

In addition, non-biodegradable organic substances such as cellulose that cannot be removed in the pretreatment process of traditional processes directly lead to the increase of excess sludge, which often has to be reduced and stabilized by means of final incineration

[0003] The traditional sewage treatment process uses energy dissipation and pollution transfer methods to intensify the emission of greenhouse gases, and while turning water pollution into air pollution, it also causes a lot of waste of resources and energy.

The rising trend of energy prices has also raised the cost of sewage treatment.

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