Up-flow independent aeration self-circulation high-cylinder aerobic sludge bed sewage treatment process

Abstract

The invention relates to a sewage treatment process taking an up-flow type independent aeration self-circulation high-column aerobic sludge bed as a main body, which mainly comprises the following steps: treated sewage enters from a water inlet at the middle upper part of a reaction column, ammonia nitrogen in the sewage realizes nitrification in a high-DO area close to the middle to remove ammonia nitrogen in the water, DO is reduced at the top along with the rising of water flow, and the DO is reduced at the bottom along with the rising of water flow; the backflow nitrate nitrogen and COD (Chemical Oxygen Demand) in the sewage are denitrified to synchronously remove the nitrate nitrogen and the COD, the aeration column enters the reaction column by adopting double backflow, the ascending velocity is controlled and adjusted by controlling an upper water inlet stop valve and a lower water inlet stop valve of the reaction column, and finally, the effluent of the aeration column enters the precipitation column through a precipitation column water inlet pipe, so that the effluent of the precipitation column is discharged. And the precipitation column realizes removal of SS (suspended solids) through overflow drainage.

Description

technical field [0001] The invention relates to an up-flow independent aeration self-circulation high-column aerobic sludge expansion bed sewage treatment process. Specifically, the invention utilizes the multi-point water inflow of the reaction column, which meets the requirements of low hydraulic retention time and low hydraulic retention time. Granular sludge requires higher shear force, and the water flow rate is controlled within a reasonable range to reduce energy consumption. Background technique [0002] Since the inception of the activated sludge method, most sewage treatment processes generally use flocculent sludge as the main body for sewage treatment. The field of sewage treatment has an irreplaceable position, but with the emergence of the granular sludge method, especially the aerobic granular sludge method, the defects and deficiencies of the flocculent sludge treatment process have begun to appear. Compared with the granular sludge method, the The flocculen...

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Problems solved by technology

Therefore, granular sludge technology has great application prospects under water quality conditions such as high organic loads. However, as far as the current development of granular sludge technology is concerned, there are still many problems in its practical application. The formation and stability of granular sludge Operation requires rising hydraulic shear forces, which require large amounts of aeration, and existing aerobic granular sludge technology exists mainly in discontinuous flow, making wastewater treatment less efficient

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