Magnetic co-sedimentation biological filtering tank process and device

Abstract

The invention discloses a magnetic co-sedimentation biological filtering tank process. Yielding water of a sand sedimentation tank of a sewage processing plant firstly enters a mixing tank, and a coagulate is added into the mixing tank; then the yielding water flows into a flocculation tank, and magnetic loading materials and a coagulant aid are added into the flocculation tank; the yielding water flows to a sedimentation tank at last, and is sedimentated to separate sludge and water; and the yielding water of the sedimentation tank is introduced to a biological filtering tank for further processing, a part of sedimentated sludge is hoisted to the flocculation tank through a refluence sludge pump so as to enhance flocculation effect, a part of sedimentated sludge is hoisted to a magnetic separation tank through a remnant sludge pump, the magnetic loading materials are separated from the sludge from the magnetic separation tank by a magnetic drum, the magnetic loading materials return to the flocculation tank for cyclic utilization, and the sludge is discharged to a sludge processing system of the sewage processing plant. The invention can improve the pretreatment process of the biological filtering tank, enhance the shock load capacity of the processing system, ensure the operational stability of the biological filtering tank, enhance the processing effect, reduce the floor area as far as possible at the same time, save land resources, and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment. Background technique [0002] Biofilter is a kind of sewage biological treatment structure. The filter is equipped with filter material, and biofilm is attached to the filter material, and the pollutants in water are degraded through biofilm. The biological filter has strict requirements on the content of suspended solids in the influent. The higher the content of suspended solids, the easier it is for the filter to be clogged, and the shorter the backwashing period of the filter, the worse the treatment effect. In order to avoid clogging of the filter material, the sewage should be pretreated before entering the biofilter. At present, the commonly used pretreatment method is primary treatment or primary intensive treatment. The process flow of the primary treatment or primary intensive treatment includes : grille, grit chamber and primary sedimentation tank or coagulation sedimentation...

AI Technical Summary

Problems solved by technology

The hydraulic retention time of the first-level treatment and the first-level intensive pretreatment process is usually between 0.5 and 2.0 hours. In order to obtain a better pretreatment effect, the hydraulic retention time is generally more than 1 hour, so the floor area is relatively large

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