Urban sewage disposal system and method based on magnetic enhancement and coagulation separation

Abstract

The invention discloses an urban sewage disposal system and method based on magnetic enhancement and coagulation separation. The system includes a pipe-type pre-magnetizer, a coagulating pond, a magnetic sedimentation accelerating equipment, a high-speed shearing machine, a magnetic separator special for magnetic seed recovery and a pipe-type demagnetizer which are connected with one another in sequence. The disposal method mainly includes the steps of pre-magnetization of sewage, loading of magnetic seeds for coagulation of sludge, sedimentation acceleration of flocculating sludge constituents through a spiral magnetic field, high-speed shearing separation of the magnetic seeds from the sludge, efficient recovery of the magnetic seeds through a multipole alternating magnetic field, magnetic oscillation for demagnetization of the magnetic seeds, and reloading of the magnetic seeds for recycling. Through full-process coverage of a magnetic technology, fast sedimentation of micro-fine granular suspended solids and efficient reuse of the magnetic seeds are achieved, the hydraulic sedimentation standing time is greatly shortened, the sewage disposal efficiency is improved, and the quality of discharged water is stabilized; all-weather efficient reduction of total phosphorus and other pollutants is achieved, loads of a secondary disposal process are alleviated, the planned floor area is obviously reduced, and the operation cost is decreased.

Description

technical field [0001] The invention relates to an urban sewage treatment technology, in particular to an urban sewage treatment system and method based on magnetically enhanced coagulation separation. Background technique [0002] Urban sewage generally contains organic pollutants (COD, BOD5), a large amount of suspended solids (SS), and is rich in nitrogen and phosphorus elements (TN, TP). Generally, it must be collected into sewage treatment plants. Through physical, chemical, physical Chemical and biological methods for treatment. [0003] Urban sewage treatment plants or reclaimed water plants mostly use coagulation sedimentation combined with biological methods for treatment. The coagulation sedimentation process utilizes the characteristic that the density of suspended solids is higher than that of water, and realizes solid-liquid separation through natural sinking. However, due to the small solid-liquid density difference, there are problems such as long hydraulic r...

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Problems solved by technology

However, due to the small solid-liquid density difference, there are problems such as long hydraulic retention time, small processing capacity per unit area, and poor solid-liquid separation effect, which have become the bottleneck of the existing sewage treatment capacity expansion and standard upgrading operations. The comprehensive removal efficiency of nitrogen, phosphorus and other pollutant indicators fluctuates greatly with seasons, resulting in low treatment efficiency of existing sewage treatment units, large floor area, unstable effluent quality, and even some effluent indicators are difficult to reach the design value

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