Sewage treatment device, system and method

Abstract

The invention discloses a sewage treatment device, system and method. The sewage treatment device comprises a reaction column, an aerator, a water feeder and a water drainage device, wherein the reaction column is vertically arranged, the water feeder is arranged below the reaction column, the aerator is arranged at the bottom of the reaction column, the water drainage device is arranged above the reaction column, an activated sludge water purification region, a biofilm water purification region and a clear water region are arranged in the reaction column from bottom to top according to a water flow direction sequentially; and a bearing layer with the capabilities of water permeability and sludge isolation is arranged between the activated sludge water purification region and the biofilm water purification region. The sewage treatment system comprises a plurality of sewage treatment devices which are connected in series with one another. The sewage treatment method comprises the following steps: (1) a starting phase, namely, injecting activated sludge into the activated sludge water purification regions of the reaction columns in each sewage treatment device in the sewage treatment system, and carrying out smothering aeration; and (2) a continuous running phase, namely, regulating according to the following principles: the longer the running time is, the larger the water inlet quantity is, and the larger the aeration quantity is. The sewage treatment device, system and method are strong in loading ability, long in backwashing period and low in energy consumption and sludge discharge.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and more specifically relates to a sewage treatment device, system and method. Background technique [0002] With the rapid expansion of the city, the sewage treatment plants originally located in the suburbs of the city are gradually surrounded by the newly developed urban areas. In addition, the implementation of new discharge standards has increased the discharge requirements for pollutants such as nitrogen and phosphorus, and most urban sewage treatment plants need to be upgraded. Due to the limitation of land use and the slogan of "energy saving and emission reduction", the expansion or renovation of sewage treatment plants must seek new processes and technologies with small footprint, high efficiency, and excellent energy saving. [0003] At present, sewage treatment mainly adopts biological aerated filter and activated sludge treatment. The biological aerated filter is favored in the conv...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a sewage treatment device, system and method, the purpose of which is to improve the ability to resist pollutant load, prolong the backwash cycle, reduce energy consumption, and achieve sludge emission reduction. Even zero discharge, thus solving the technical problems of difficult sludge disposal, short backwashing cycle and high energy consumption

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