Long retention time circulating type anoxic reinforced town sewage nitrogen and phosphorus removing method

Abstract

The invention discloses a long retention time circulating type anoxic reinforced town sewage nitrogen and phosphorus removing method. The long retention time circulating type anoxic reinforced town sewage nitrogen and phosphorus removing method comprises following steps: sewage is delivered through a detritus chamber, and then is delivered through an anaerobic reaction tank, an anoxic reaction tank, an aerobic reaction tank, and a sedimentation basin successively; wherein the anoxic reaction tank is a circulating type trench type anoxic reaction tank; the internal part of the circulating typetrench type anoxic reaction tank is separated by a separating wall along the transverse axis at the middle part; mechanical stirring devices are arranged on the left side and the right side of the separating wall; water from the anaerobic reaction tank is introduced into the circulating type trench type anoxic reaction tank from one side of the separating wall; circulating flowing of sewage in thecirculating type trench type anoxic reaction tank is carried out along a stirring direction, and sewage is discharged out from the circulating type trench type anoxic reaction tank, and introduced into the aerobic reaction tank and the sedimentation basin through the other side of the separating wall. According to the long retention time circulating type anoxic reinforced town sewage nitrogen andphosphorus removing method, anoxic reaction tank retention time is prolonged, the circulating-type flow anoxic reaction tank capable of promoting particular organic hydrolysis is adopted, so that high efficiency conversion of particular organic matters in the anoxic reaction tank is promoted, and sufficient carbon sources are provided for biological nitrogen and phosphorus removing.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to an enhanced nitrogen and phosphorus removal method for treating urban sewage containing a high proportion of granular organic matter. Background technique [0002] The main objects of urban domestic sewage removal are organic matter and nitrogen and phosphorus. The commonly used processes are continuous inflow anaerobic-anoxic-aerobic (commonly known as AAO) activated sludge process and intermittent inflow circulating activated sludge ( Often called CASS) process, the most widely used is the continuous flow AAO activated sludge process. This continuous flow AAO process flow is as follows figure 1 As shown, the effluent from the grit chamber enters the primary sedimentation tank to remove particulate organic matter, and then the colloids and dissolved organic matter in the water enter the anaerobic A pool (anaerobic pool, referred to as the anaerobic A pool), anoxic A pool ...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that particulate organic matter cannot be effectively transformed in the biological reaction tank to make up for the insufficient carbon source for denitrification and denitrification, the present invention provides a method for long residence time circulation anoxic enhanced denitrification and dephosphorization of urban sewage

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