Improved four-ditch type oxidation ditch and sewage treatment method thereof

Abstract

The invention relates to an improved four-ditch type oxidation ditch comprising a four-ditch type oxidation ditch, wherein the four-ditch type oxidation ditch comprises four oxidation ditches; each oxidation ditch is provided with aeration equipment; communication holes for communicating the two adjacent oxidation ditches are reserved on the public pond walls among the four oxidation ditches. Theinvention is characterized in that anaerobic ponds are arranged in the front of the four-ditch type oxidation ditch; the anaerobic ponds are respectively connected with the corresponding four oxidation ditches through four control valves; and the sludge in the side ditches for precipitation of the four-ditch type oxidation ditch reflows to the anaerobic ponds through a sludge reflux pump. Based on the improved four-ditch type oxidation ditch, the invention provides a sewage treatment method of the improved four-ditch type oxidation ditch. The improved four-ditch type oxidation ditch and the sewage treatment method thereof can enhance the efficiency of biological dephosphorization and denitrification, enhance the utilization rate of the equipment, reduce energy consumption and save investment and operation cost.

Description

technical field [0001] The invention relates to an improved four-ditch oxidation ditch and a sewage treatment method thereof, belonging to the field of sewage treatment. Background technique [0002] Alternate oxidation ditch refers to the adjustment and transposition of the aeration operation and sedimentation operation of the oxidation ditch in time sequence in one or more ditches in order to obtain the best or required treatment effect. Its characteristic is that the oxidation ditch aeration and sedimentation alternate crop rotation, and there is no secondary sedimentation tank. There are four basic types: A, VR, D, and T, and there are four-ditch oxidation ditch, etc. [0003] Type A oxidation ditch is a single-ditch alternating working oxidation ditch, mainly used for BOD removal and nitrification, and is limited to small treatment occasions. The duration of each working period depends on the cycle of intermittent sewage discharge. [0004] The VR-type oxidation ditch...

AI Technical Summary

Problems solved by technology

Although the volume theoretical utilization rate of the four-ditch oxidation ditch is higher than that of the three-ditch oxidation ditch, due to the alternate inflow and outflow of sewage and the flow of different directions, the concentration of activated sludge between the ditch will be different, the sludge concentration in the sedimentation tank is high, and the sludge concentration in the reaction tank is high. The mud concentration is low, and the volume utilization rate cannot reach the theoretical value

[0010] 2. The equipment utilization rate is not high

Each ditch is generally equipped with aeration equipment and mixing equipment. Due to the low volume utilization rate, the utilization rate of the equipment is also not high, and the installed capacity is large.

In addition, the side ditches on both sides are alternately used as sedimentation outlet ditches, and water outlet adjustable weirs are generally set up. The number of units is large, the control is complicated, and the amount of maintenance is large.

[0011] 3. Due to the absence of a stable anaerobic environment, the effect of biological phosphorus removal is not ideal

The traditional alternating oxidation ditch can form a local anoxic environment in the ditch to realize the denitrification function, but it is difficult to form a stable anaerobic environment to realize biological phosphorus removal

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