Sewage pretreatment process

A sewage pretreatment and sewage technology, applied in the direction of water/sewage treatment, water/sewage multi-stage treatment, water/sewage treatment equipment, etc., can solve the problem of large area of ​​sewage pretreatment, to improve the effect of pretreatment, The effect of reducing the total amount of COD

Active Publication Date: 2020-08-11
CHENGDU TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a sewage pretreatment process, which can effectively solve the problem that the existing sewage pretreatment occupies a large area, and at the same time improve the pretreatment effect of sewage, and effectively reduce the total amount of COD, BOD and SS in sewage , the use of the filter is not affected

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0024] 1) Add an inorganic flocculant, such as polyaluminum chloride, to the sewage with a flow rate of m1m / s, and then perform a filter. Need to add the quality of inorganic flocculant);

[0025] 2) Add organic flocculants, such as polyacrylamide, to the sewage after primary filtration to obtain pretreated sewage; the amount of organic flocculants added is n2mg / L (taking the volume of sewage as a reference, that is, every The quality of organic flocculant needs to be added to 1 liter of sewage), and the flow rate of sewage is m2mm / s during primary filtration and secondary filtration.

[0026] In the above steps, the sewage flows in the same direction throughout the whole process, such as lateral flow, the filter screens for primary filtration and secondary filtration are preferably perpendicular to the sewage flow direction, the filter screen aperture for primary filtration is 11 μm, and the filter screen aperture for secondary filtration is 12 μm.

[0027] The pretreated se...

Embodiment approach 2

[0033] 1) Add an inorganic flocculant, such as polyaluminum chloride, to the sewage with a flow rate of m1m / s, and then perform a filter. Need to add the quality of inorganic flocculant);

[0034] 2) The sewage after primary filtration flows through the settlement area and the electric field area in turn, and then add organic flocculants, such as polyacrylamide, and then perform secondary filtration to obtain pretreated sewage; the amount of organic flocculants added is n2mg / L (Taking the volume of sewage as a reference, that is, the mass of organic flocculant that needs to be added to each liter of sewage), the flow rate of sewage is m2mm / s during primary filtration and secondary filtration.

[0035] In the above steps, before the primary filtration, the flowing sewage pushes the propeller to rotate, and at the same time, the propeller with a rotating speed of R rad / s pushes the sewage downward, so that the sewage flows downward during the primary filtration, and the sewage f...

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PUM

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Abstract

The invention relates to a sewage preprocessing technology. According to the sewage preprocessing technology, an inorganic flocculating agent is added into flowing sewage, then primary filtering is performed, after primary filtering, an organic flocculating agent is added, and then secondary filtering is carried out t obtain preprocessed sewage. The provided sewage preprocessing technology can solve the problem that in the prior art the occupied area for sewage pretreatment is large, at the same time, improves the sewage preprocessing effect, effectively reduces the total amounts of COD, BOD,and SS in sewage, and does not influence the use of a filter screen.

Description

technical field [0001] The invention relates to a sewage pretreatment process. Background technique [0002] Traditional sewage pretreatment usually adopts the method of standing still or increasing biological fermentation to promote the precipitation of impurities in sewage in the form of precipitation, so as to remove them through filtration steps; but the traditional sewage pretreatment method is not only time-consuming, but also At the same time, due to the need to stand still, the horizontal area of ​​the stand is often enlarged to accelerate the sedimentation process, resulting in a wider footprint. [0003] Membrane treatment process is often used for the purification of existing sewage, but before the membrane treatment, the sewage needs to be pretreated. The purpose of pretreatment is to filter and remove the impurities that can be converted into precipitates in the form of impurities, and then use membrane treatment technology to achieve the purpose of purification...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F9/12
CPCC02F1/001C02F1/48C02F1/5236C02F1/56C02F9/00C02F2001/007C02F2201/002C02F2301/08
Inventor 景江纪福林毛朝玉许洋汪栋春罗怀清
Owner CHENGDU TECH UNIV
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