Sewage biochemical treatment system and method

[0027] Example 1

[0028] This embodiment is used to illustrate the sewage biochemical treatment system of the present invention, which contains activated sludge particles with magnetic powder as the core. figure 1 It is a schematic structural diagram of a sewage biochemical treatment system according to an embodiment of the present invention, such as figure 1 As shown, the system includes a biochemical reaction tank 1 and a secondary settling tank 2 which are connected end to end through a pipeline, and the magnetic powder in the sludge is recycled through a magnetic separator 5 for recycling.

[0029] Wherein, the biochemical reaction tank 1 is provided with a sewage input port for inputting pretreated effluent to the biochemical reaction tank 1. The pretreatment effluent is obtained by pretreatment of sewage, which is mainly used to reduce the concentration of suspended solids in the sewage.

[0030] The mixed liquid obtained from the reaction in the biochemical reaction tank 1 ent

[0034] Example 2

[0035] This embodiment is used to illustrate the sewage biochemical treatment method of the present invention, including the following steps:

[0036] 1) The pretreatment effluent is discharged to the biochemical reaction tank through the sewage inlet set in the biochemical reaction tank, and the air blower is introduced into the air. At the same time, the magnetic powder addition tank inputs the mixture of magnetic powder and water into the biochemical reaction tank through the pipeline;

[0037] 2) The mixed liquid obtained from the reaction in step 1) enters the secondary sedimentation tank through the pipeline for sludge-water separation, and the generated sludge is output through the sludge output port located at the bottom of the secondary sedimentation tank. The magnetic powder is sent to the biochemical reaction tank, and the other part of the sludge is returned to the biochemical reaction tank;

[0038] 3) Sampling and testing the liquid separated from mud and

[0040] Example 3

[0041] The method of the embodiment of the present invention is used to treat the pretreatment effluent of a sewage plant. The sludge concentration of the biochemical reaction tank is 12.1g / L, and the loss of magnetic powder is less than 4g / ton.

[0042] Influent water quality:

[0043]

[0044] Water quality:

[0045]

[0046] The results showed that the effluent reached the Class A standard in the "Emission Standard of Pollutants for Urban Wastewater Treatment Plants" (GB18918-2002) by using the treatment method of the present invention.