Resource recycling municipal sewage treatment device and process

Abstract

The invention discloses a resource recycling municipal sewage treatment device and process and belongs to the technical field of municipal sewage treatment. The resource recycling municipal sewage treatment device comprises a grating, a collecting tank, a lift pump, a primary settling tank, a secondary settling tank, a pyrolysis tank, a water ejector, a circulating pump, an ammonia tank and the like. The process specifically comprises enabling sewage to flow through the grating for suspended solid pretreatment and then into the collecting tank for being lifted into the primary settling tank bythe lift pump for flocculation and absorption reaction, and then overflowing the reacted sewage into the secondary settling tank; feeding disodium hydrogen phosphate and magnesium chloride to form magnesium ammonium phosphate crystal for settlement, then conveying magnesium ammonium phosphate slurry into the pyrolysis tank, feeding sodium hydroxide to regulate pH to 11, and controlling the temperature to be 85-95 DEG C; by means of the circulating pump, enabling the water ejector to produce negative pressure to absorb ammonia gas, and through a magnesium sodium phosphate pump, lifting magnesium sodium phosphate solution produced in the pyrolysis tank into the second settling pond for recycling. The resource recycling municipal sewage treatment device and process can recycle resources to produce biomass fuel raw materials and ammonia, and through circulation of agent, reduce the application amount of agent.

Description

technical field [0001] The invention belongs to the technical field of urban sewage treatment, and specifically relates to a resource recovery type urban sewage treatment device and a resource recovery type urban sewage treatment process. Background technique [0002] At present, most urban sewage treatment methods use biological treatment processes. The biological treatment process has the disadvantages of large area, large investment, huge system, complex management, high operating costs, long construction period, and great impact on the climate. The final disposal of its sludge is a problem that has plagued people for a long time. It is difficult to treat sewage to Class A water quality standards. [0003] The resource recovery type urban sewage treatment process adopts the physical and chemical method, which has the advantages of small footprint, small investment, simple system, low operating cost, simple management, short construction period, and little impact on clima...

AI Technical Summary

Problems solved by technology

[0005] It is generally believed that the operating cost of the biological method is low, but due to the continuous complexity of the biochemical process, its operating cost is already higher than that of the physical and chemical process.

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