Oxidation ditch sewage treatment process

Abstract

The invention provides an oxidation ditch sewage treatment process, which belongs to the technical field of sewage treatment. The device comprises a reaction tank, a water inlet pipe, a water outlet area, an emptying area, an aeration area and a non-aeration area, wherein the aeration area and the non-aeration area are located in the reaction tank, the water inlet pipe is connected to the bottom of the reaction tank, and the emptying area and the water outlet area are both arranged in the middle of the reaction tank and distributed at the two ends of the reaction tank; a partition plate is arranged in the middle of the reaction tank; a first water impeller, a second water impeller, a third water impeller and a fourth water impeller are distributed in the reaction tank, the first water impeller and the third water impeller are located on the same side of the partition plate, and the second water impeller and the fourth water impeller are located on the other side of the partition plate.The process is applied to sewage treatment, the biological bacterium density of the system in a low dissolved oxygen state is further enriched, the treatment efficiency of a biochemical system is further improved, and the operation cost is reduced.

Description

technical field [0001] The application relates to an oxidation ditch sewage treatment process, which belongs to the technical field of sewage treatment. Background technique [0002] Printing and dyeing wastewater usually contains NH 3- , NH 4+ , the existence of these examples will affect the total nitrogen content of the discharged wastewater. If the total nitrogen content is too high, the water body will become eutrophic. The reaction tank of the oxidation ditch is divided into an aeration zone (nitrification zone) and a non-aeration zone (denitrification zone). The dissolved oxygen in the aeration zone is generally required to be 3-5mg / L, and the dissolved oxygen in the non-aeration zone is usually higher than 0.5 mg / L, the nitrification reaction in the oxidation ditch is sufficient, but the denitrification zone cannot be fully carried out, and the total nitrogen removal rate is generally only 40-50%. [0003] During the treatment process, the mixing effect is poor, a...

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Problems solved by technology

[0002] Printing and dyeing wastewater usually contains NH 3- , NH 4+ , the existence of these examples will affect the total nitrogen content of the discharged wastewater. If the total nitrogen content is too high, the water body will become eutrophic. The reaction tank of the oxidation ditch is divided into an aeration zone (nitrification zone) and a non-aeration zone (denitrification zone). The dissolved oxygen in the aeration zone is generally required to be 3-5mg / L, and the dissolved oxygen in the non-aeration zone is usually higher than 0.5 mg / L, the nitrification reaction in the oxidation ditch is sufficient, but the denitrification zone cannot be fully carried out, and the total nitrogen removal rate is generally only 40-50%

[0003] During the treatment process, the mixing effect is poor, and black sludge deposits are often seen on the surface of the oxidation ditch; especially at the bends where the flow velocity is slow and the sludge deposits are more serious

The overall flow velocity is 0.15m / s, which is lower than the design value of 0.3m / s; the thrust at the bend is not enough, and sludge is easy to accumulate; the aeration distribution is uneven, and the gas diffusion rate is low

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