Full-flow process for upgrading and reconstructing urban sewage factory

A technology for upgrading and transformation of urban sewage, applied in the field of urban sewage treatment and recycling, it can solve the problem that the effluent cannot meet the quality of reclaimed water, and achieve the effect of reducing physical indicators such as turbidity and chromaticity, low investment and small footprint.

Inactive Publication Date: 2009-05-13
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the effluent of existing urban sewage plants cannot meet the quality of reclaimed water, and overcome the shortcomings of the current conventional water treatment process, and provide a whole process process of sewage regeneration, so as to ensure that the sewage plant can maintain the original treatment process on the basis of upgrade

Method used

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  • Full-flow process for upgrading and reconstructing urban sewage factory

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Embodiment Construction

[0016] The original domestic sewage, secondary effluent, deep effluent and deep removal rate of the sewage plant are shown in Table 1.

[0017] The specific operating parameters are described as follows:

[0018] refer to figure 1 , the secondary effluent of the sewage plant enters the flocculation tank 1 through the water inlet pipe 4, and at the same time, polyaluminum chloride flocculant is added through the flocculant dosing pipe 8. According to the water quality of the secondary effluent in Table 1, the flocculant dosage is 70mg / L. The secondary effluent and flocculant are mixed and reacted in the pipeline mixer, and the flocculation reaction occurs under the third-stage stirring in the flocculation tank, and the stirring intensity is 50 / 30 / 20 (S -1 ), the reaction residence time is 20min. After flocculation, impurity particles, sludge fragments, organic matter, etc. in the water destabilize and aggregate to form a floc combination, and then flow to the air flotation ta...

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Abstract

The invention provides a whole flow for upgrading a municipal sewage treatment plant, which belongs to the field of municipal sewage treatment and reclamation. The flow is characterized in that second-stage outlet water from the sewage treatment plant enters a flocculation tank through a water inlet pipe, simultaneously added with a flocculant through a flocculation tank addition pipe, and flows to an air flotation tank by the gravity of a water outlet pipe; in the air flotation tank, floc combination meets dissolved-air water in a dissolved-air backflow pipe, is collided with and adhered to micro bubbles released by a dissolved air releaser, and floated upwards to an air flotation tank separation region; scum is discharged from a scum outlet; air flotation outlet water flows in an arobic filtering pool through a water outlet pipe, oxygen needed by organism is supplied by an aeration pipe, and the water is charged through a water outlet pipe; after one filter cycle; and a filter material is backwashed by air and water supplied by a backwashing air pipe and a backwashing water pipe respectively, and the backwashing sewage is discharged through a sewage pipe. The whole flow has the advantages of eliminating nutrients such as organism and ammonia nitrogen in the second-stage outlet water, further reducing physical indexes such as turbidity and chromaticity after the particle removal by air flotation and improving water quality.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and resource utilization, and in particular relates to the upgrading and transformation of secondary sewage treatment plants and the whole process of sewage regeneration. Background technique [0002] At present, my country has achieved the goal of setting up sewage treatment plants in cities and towns. The original situation of direct discharge of urban sewage into rivers and lakes has been greatly improved, and the urban environment has been greatly improved. However, most of the current sewage plants are secondary treatment. In view of the severe situation of water shortage in my country, water is a sustainable recycling resource. The sewage plants are facing upgrading and transformation, and the secondary treatment that has reached the national secondary discharge standard will be completed. Advanced treatment of grade effluent, strive to reach grade B standard, even grade A standard, so t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F1/24C02F1/28C02F3/12
CPCY02W10/10
Inventor 李冬朱兆亮曹相生张杰
Owner BEIJING UNIV OF TECH
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