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Efficient sewage treatment process and device based on electron current directional adjustment and control

A technology of sewage treatment and electron flow, applied in water/sewage treatment, biological water/sewage treatment, water/sewage multi-stage treatment, etc. Reducing the concentration of difficult pollutants to achieve the effect of improving interception, high-efficiency solid-liquid separation, and enhanced removal

Active Publication Date: 2016-04-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional electrochemical method is not ideal for the removal of particulate organic matter, and it is difficult to reduce the concentration of pollutants to meet the standard limit for water reuse, which limits its larger-scale application and requires additional post-treatment units

Method used

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  • Efficient sewage treatment process and device based on electron current directional adjustment and control

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Effect test

Embodiment 1

[0027] A high-efficiency sewage treatment process based on electron flow directional control, the process is carried out as follows:

[0028] 1) Sewage first enters the anaerobic fermentation electron generation chamber through the water inlet system. The granular and partially dissolved organic matter in the sewage is intercepted and adsorbed by porous conductive fillers, and the organic matter is converted into electrons under the action of electrogenic microorganisms; the treated sewage enters the heterotrophic-autotrophic denitrification chamber and the aerobic membrane separation chamber in turn .

[0029] 2) In the heterotrophic-autotrophic denitrification chamber, the microorganisms use the residual organic matter in the feed water and the electrons transferred from the external circuit, and through the heterotrophic and autotrophic denitrification pathways, the sludge mixture returned from the aerobic membrane separation chamber Nitrate or nitrite in the removal.

[...

Embodiment 2

[0034] Using the process and device described in Example 1 to treat rural domestic sewage, the influent COD concentration is 312.7±20.9mg / L, the ammonia nitrogen concentration is 27.7±5.8mg / L, the total nitrogen concentration is 30.3±7.8mg / L, and the total phosphorus concentration 8.1±3.2mg / L. The hydraulic retention time is 13.7h, and the membrane flux is 22L / (m 2 · h), the dosage of chemical agent polyferric chloride is 12mg / L. The average removal rate of COD was (96.3±1.0)%, the average removal rate of ammonia nitrogen was (99.2±0.9)%, the average removal rate of total nitrogen was (92.2±2.4)%, and the average removal rate of total phosphorus was (87.1±4.2)%. The membrane cleaning cycle is maintained at more than 150d, and the maximum power density can reach 94.2mW / m 2 .

Embodiment 3

[0036] Using the process and device described in Example 1 to treat actual domestic sewage in a community, the influent COD concentration is 320.7±70.6mg / L, ammonia nitrogen concentration is 46.1±7.2mg / L, and total nitrogen concentration is 55.6±8.2mg / L. The hydraulic retention time is 14h, and the membrane flux is 18L / (m 2 h). The average removal rate of COD is (96.9±2.4)%, the average removal rate of ammonia nitrogen is (98.5±1.2)%, the average removal rate of total nitrogen is (84.7±3.5)%, the membrane cleaning cycle is maintained at more than 150d, and the maximum power density can Reached 91.9mW / m 2 .

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Abstract

The invention relates to an efficient sewage treatment process and device based on electron current directional adjustment and control and belongs to the technical field of sewage (wastewater) treatment. In the process, an anaerobic fermentation electron generation chamber, a heterotrophic-autotrophic denitrification chamber and an aerobic membrane separation chamber are included. After low-concentration organic sewage enters the anaerobic fermentation electron generation chamber, particulate organic matter and part of dissolved organic matter are intercepted and adsorbed by filler and form an extracellular current under the action of microorganisms used in a follow-up autotrophic denitrification process. Meanwhile, by the utilization of a microfiltration / ultrafiltration membrane separation process, the load in the sewage treatment process is increased, solid-liquid separation efficiency is guaranteed, and outflow water quality meets high-standard sewage (wastewater) treatment reuse requirements. According to the process, the removal effect of nutrient elements including nitrogen is intensified by adjusting the flowing direction of the electron current in the organic sewage treatment process, the system sludge yield is lowered, and membrane filtration pollution is relieved. Through the process, the low-concentration organic sewage can be treated efficiently at normal temperature (higher than 15 DEG C), and running energy consumption for sewage treatment is lowered remarkably.

Description

technical field [0001] The invention belongs to the technical field of water and waste water treatment, and in particular relates to a high-efficiency sewage treatment process and device based on directional control of electron flow. Background technique [0002] With the development of social economy, our country's environmental problems are becoming more and more serious, and the water pollution problem has become an important factor restricting our country's social and economic development. Therefore, the state has formulated stricter nutrient discharge standards to prevent further eutrophication of receiving water bodies. Nitrogen, as a global water pollutant, has received more and more attention. Reducing nitrogen discharge in urban sewage is of great significance for controlling eutrophication and improving water environment. Efficient denitrification is one of the difficulties in the operation and regulation of urban sewage treatment plants. [0003] The biological ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16
CPCC02F1/4608C02F3/1268C02F3/28C02F9/00C02F2101/16C02F2301/08C02F3/005C02F3/1273C02F3/2806C02F3/303C02F3/305C02F3/308C02F2001/46133C02F2001/46152H01M8/16Y02E60/50Y02W10/10C02F3/14
Inventor 王志伟马金星闫凯丽陈妹邵伟刘简王煊博章畅吴志超
Owner TONGJI UNIV
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