Treatment method for municipal sewage through filling material and oxidation ditch combined process

Abstract

The invention belongs to the technical field of sewage treatment, and concretely provides a treatment method for municipal sewage through a filling material and oxidation ditch combined process. According to the invention, an oxidation ditch is divided into an aerobic zone, an anoxic zone and a pre anaerobic zone. The method comprises a process flow as shown in a figure 1 in the specification. The method comprises the following steps: allowing sewage to enter an anaerobic pool through a water inlet pipe, subjecting the sewage to stirring and mixing with reflux sludge in the anaerobic pool, and allowing the obtained mixture to enter the anoxic zone of the oxidation ditch through the bottom part of the anaerobic pool; uniformly adding a filling material into the oxidation ditch; allowing the sewage to flow through the aerobic zone of the oxidation ditch, allowing one part of the sewage to enter a secondary sedimentation pool through an outlet of the oxidation ditch, and allowing the other part of the sewage to return to the anoxic zone and continue circulation flow in the oxidation ditch; subjecting the sewage in the secondary sedimentation pool to sludge-water separation, and discharging supernatant liquid as effluent water of a system; and allowing sedimented activated sludge to enter a sludge well through a channel located at the bottom part of the secondary sedimentation pool, subjecting the sludge to refluxing into the anaerobic pool through a sludge relux pump in the sludge well and carrying out mixing with influent water, and discharging partial residual sludge out of the system through a sludge pump. The invention has the following beneficial effects: the treatment method provided by the invention has significant effects on removal of COD, NH+4N, TN and TP, and enables the quality of the effluent water of the oxidation ditch to be stably superior to the standard of a first-grade B, wherein a part of indexes reach the standard of a first-grade A.

Description

Technical field [0001] The invention belongs to the field of sewage treatment, and specifically is a method for treating urban sewage by using a filler oxidation ditch composite process. Background technique [0002] Activated sludge method and biofilm method are two traditional process types for aerobic biological treatment of sewage. The advantages of the activated sludge method are large amount of treated water, high pollutant removal rate, and good effluent quality. Its various deformation processes can take into account nitrogen and phosphorus removal; the disadvantages are that the operation is not stable enough, sludge expansion is prone to occur, and the remaining sludge output is large , The treatment effect of low-concentration sewage is poor. The advantages of the biofilm method are stable operation, low sludge output, strong removal of ammonia nitrogen and refractory pollutants, strong impact load resistance, and relatively simple management; its disadvantage is that...

AI Technical Summary

Problems solved by technology

The advantages of the activated sludge method are large amount of treated water, high pollutant removal rate and good effluent quality, and its various deformation processes can take into account nitrogen and phosphorus removal; the disadvantage is that the operation is not stable enough, sludge bulking is easy to occur, and the output of residual sludge is large , The treatment effect on low-concentration sewage is poor

The advantages of the biofilm method are stable operation, low sludge output, strong ability to remove ammonia nitrogen and refractory pollutants, strong impact load resistance, and relatively simple management; the disadvantage is that some tiny particles produced by biofilm shedding are not easy to settle and cause water discharge. High turbidity, poor removal effect of total nitrogen and total phosphorus

The performance of the filler has a great influence on the biofilm method, which once limited the scale of the practical application of the biofilm method

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