Introduction to the Oxidation Ditch Process of the Oxidation Ditch Process

A simple technology for treating wastewater by oxidation ditch process. In terms of reaction principle, delayed aeration is generally used to keep the inlet and outlet water continuous, without the primary sedimentation tank, and the microorganisms generated in the ditch are stably survived and grown in the sludge, and the reaction occurs in the sewage aeration purification, which greatly simplifies the treatment steps. The oxidation tank generally bears the shape of a long and narrow annular ditch connected from end to end, and the aeration device mostly adopts a surface aerator.

The sewage enters the oxidation ditch and the activated sludge is fully mixed, and then the aeration is pushed by the specific positioning effect of the aeration device, so that the sewage and sludge are suspended in the closed channel to do non-stop circulation, and the sludge is further fully mixed with the sewage in the circulation, in which the microorganisms and organic matter fully react, and then the sewage mixed with the sludge enters the secondary sedimentation tank for solid-liquid separation, so that the sewage can be purified.

Hello, the process of oxidation ditch process is still relatively complex, the following will share an oxidation ditch process flow chart for you to see, each step is explained in detail, I hope it can help you.

The Carrousel oxidation ditch was developed in 1967 by the Dutch company DHV. The purpose of its development is to fully mix the mixed liquid in the deep oxidation ditch and maintain a high mass transfer efficiency, so as to overcome the defects of small oxidation ditch with shallow depth and poor mixing effect. Practice has proved that the process has the advantages of low investment, high treatment efficiency, good availability, convenient management and low operation and maintenance costs.

Carrousel oxidation ditch uses a vertical surface aerator, and the aerator is installed at one end of the ditch, so it forms an oxygen-rich zone near the downstream of the aerator and an anoxic zone upstream, which is conducive to biological flocculation and makes the activated sludge easy to settle, and the design effective water depth is meters, and the flow rate in the ditch is meters and seconds. The removal rate of BOD5 can reach 95 99, the nitrogen removal efficiency is about 90, the phosphorus removal efficiency is about 50, and the phosphorus removal efficiency can reach 95 if iron salt is added. [1 ]

The Carrousel Oxidation Ditch is a fully mixed aeration tank with a negligible or negligible coefficient of concentration variation, and the influent water is rapidly diluted, so it is highly resistant to shock loads. However, for a certain section of the oxidation ditch, it has some push-flow characteristics, that is, the DO concentration is higher in the downstream area of the aerator, but the DO concentration decreases as the distance from the aerator increases (anoxic zone appears). This construction method makes the anoxic zone and aerobic zone exist in one structure, makes full use of its hydraulic characteristics, and achieves the purpose of efficient biological denitrification.

It occupies a large area, the investment cost is slightly higher, and the energy consumption is slightly higher than that of blast aeration. In addition, it is easy to form dead zones in the pool, and there is grit.