Sewage pretreatment microfiltration equipment and method

Abstract

The invention discloses sewage pretreatment microfiltration equipment and method. The microfiltration equipment comprises a water inlet chamber, filter cloth, a water outlet area, a sludge settling area, a sludge thickening area, a sludge collecting area, an air knife cleaning system and a screw press, wherein the filter cloth is arranged in the sludge settling area and the sludge thickening area, filter cloth driving devices are arranged in the sludge settling area and the sludge thickening area, and the air knife cleaning system is arranged below the filter cloth in the sludge thickening area; the screw press is arranged in the sludge collecting area; and a sewage treatment method of the microfiltration equipment comprises three procedures of sludge separation, sludge thickening and sludge dewatering. The equipment can reduce investment cost by 30-60%, and costs for sludge treatment, transportation and disposal are greatly lowered.

Description

technical field [0001] The invention belongs to sewage pretreatment technology, and in particular relates to a sewage pretreatment microfiltration device and a sewage treatment method thereof. Background technique [0002] Sewage treatment processes are generally divided into primary treatment, secondary treatment, and tertiary treatment. The primary treatment is pretreatment, which mainly adopts physical and chemical treatment methods such as primary precipitation; the secondary treatment mainly adopts biological treatment methods; the tertiary treatment is fine treatment, and biochemical treatment or a combination of physical and chemical treatment can be used according to the requirements of effluent water quality Way. In the sewage treatment process, pretreatment is an essential process. The pretreated sewage can only be discharged up to the standard after secondary treatment and tertiary treatment. [0003] At present, the primary sedimentation tank is the most import...

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Problems solved by technology

However, the secondary biochemical treatment of sewage requires dissolved organic matter as a carbon source to complete the denitrification process. Therefore, the dissolved organic matter removed by pretreatment and the dissolved organic matter required in the secondary biochemical treatment create a contradiction between the two.

[0004] In addition, the traditional pretreatment method occupies a large area, and part of the dissolved organic matter removed by coagulation and sedimentation is not conducive to the subsequent denitrification and denitrification. Therefore, the most ideal pretreatment method is: it can not only remove inorganic solid particles, but also Retain as much dissolved organic matter as possible to provide carbon sources for denitrification and denitrification in the subsequent biochemical treatment stage, reducing capital investment and operating costs caused by additional carbon sources

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