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Sewage deep-treatment device and method

An advanced treatment and sewage technology, applied in water/sewage treatment, biological treatment devices, biological water/sewage treatment, etc., can solve the problems of difficult to deal with excess sludge, no nitrogen removal, long hydraulic retention time, etc. Eutrophication risk, reduced nutrient load, effect of short residence time

Active Publication Date: 2018-06-29
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical treatment can effectively remove the remaining phosphorus in sewage, but it has no effect on nitrogen removal, and at the same time, it will produce residual sludge that is difficult to handle
[0003] In recent years, microalgae have been more and more used in the treatment of raw sewage water, and some studies have tried to apply microalgae to the treatment of secondary effluent from sewage plants. However, due to the typical characteristics of low nutrients in sewage plant secondary effluent, microalgae Algae are usually difficult to grow or have a slow growth rate, resulting in long hydraulic retention time and difficult to achieve the purpose of efficient nitrogen and phosphorus removal

Method used

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  • Sewage deep-treatment device and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take the artificially prepared medium to simulate low-nutrient sewage (TN 13-15mg / L, TP 1.3-1.5mg / L, chemical oxygen demand 7 unit / mL, the simulated low-nutrient sewage enters the reaction tank 2 from the water inlet pump 1, adjusts the flow rate of the air pump 6, controls the aeration carbon dioxide concentration of the microporous aeration bar to be 1-2%, and the aeration rate is 0.2-0.3 (v / v·min -1 ), adjust the intensity of cold fluorescent light to 400μmol·m -2 ·s -1 , set the light-dark cycle ratio to 24h / 0h, set the HRT of the reaction tank to 2-4h, the algae liquid in the reaction tank overflows to the membrane tank 3, and the outlet water flow is controlled by the outlet pump 5 connected with the membrane filter module 4, and through the outlet The pressure gauge (not shown) on the water pipe monitors the membrane filter assembly and cleans it regularly. The HRT of the membrane pool is set to 1-2 hours, and part of the algae liquid is returned to the reacti...

Embodiment 2

[0041] Take the actual secondary effluent of a domestic sewage plant (TN 6~12mg / L, TP 0.3~1.0mg / L, chemical oxygen demand 6 unit / mL, the secondary effluent enters the reaction tank 2 from the water inlet pump 1, adjusts the flow rate of the air pump 6, controls the aeration carbon dioxide concentration of the microporous aeration bar to be 1-2%, and the aeration rate is 0.2-0.3 (v / v· min -1 ), adjust the intensity of cold fluorescent light to 350μmol·m -2 ·s -1 , set the light-dark cycle ratio to 12h / 12h, set the HRT of the reaction tank to 3-4h, the algae liquid in the reaction tank overflows to the membrane tank 3, and the outlet water flow is controlled by the outlet pump 5 connected with the membrane filter module 4, and the outlet water flow is controlled by the outlet pump 5 The pressure gauge (not shown) on the water pipe monitors the membrane filter assembly and provides regular cleaning. The HRT of the membrane pool is set at 1.5 to 2 hours, and part of the algae li...

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Abstract

The application discloses a sewage deep-treatment device and method. The method utilizes rotary monoraphidium to carry out denitrification and phosphorus removal under a preset lighting condition. Themethod comprises the following steps: (1) sewage enters a reaction pool through a water inlet, a first aeration device supplies gas into the reaction pool and mixed liquid of the sewage treated by the reaction pool and microalgae enters a membrane pool; (2) a second aeration device supplies gas into the membrane pool, a membrane filtering component in the membrane pool separates the microalgae from the water, the treated water is discharged by a water discharging port on the membrane filtering component, one part of the mixed liquid of the microalgae and the sewage in the membrane pool returns into the reaction pool, and the other part of the mixed liquid is discharged by an algae port. The sewage deep-treatment device and method disclosed by the application have the beneficial effects that the concentrations of nitrogen and phosphorus in the water can be reduced to an extremely-low level in a short time, so that the risk of eutrophication of a water body collecting tail water from sewage plants is reduced.

Description

technical field [0001] The invention relates to the fields of sewage treatment and water pollution control, in particular to a sewage advanced treatment device and method. Background technique [0002] Nitrogen, phosphorus and other elements are important pollutants that cause eutrophication of water bodies, and controlling the discharge of nitrogen and phosphorus is an important means of controlling eutrophication of natural water bodies. The existing sewage treatment process can remove most of the nitrogen and phosphorus in the water body, but a large number of studies have shown that after the existing sewage treatment process, the nitrogen and phosphorus contained in the sewage will still lead to a high risk of eutrophication in the receiving water body. At present, biological treatment can effectively remove nitrogen and phosphorus in the secondary sedimentation effluent, but it has the problems of large area and long hydraulic retention time. Chemical treatment can ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F1/44
CPCC02F1/44C02F3/322C02F2203/006C02F1/444C02F2101/105C02F2101/16C02F2209/08C02F2209/16C02F2209/18
Inventor 陶益周灿炜陈光耀
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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