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A technology for advanced biological treatment of wastewater

A technology of advanced treatment and biological treatment, applied in the direction of anaerobic digestion treatment, etc., can solve the problems of hardening and passivation of iron filings bed, failing to completely solve the problems of microbial adhesion and deposition, increasing the complexity of equipment and difficulty of practical operation, and achieving easy operation. Control, limited increase in water treatment costs, and the effect of cheap consumption

Active Publication Date: 2014-10-08
东华(西藏)低碳科技有限责任公司
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Problems solved by technology

However, the method of regulating iron dissolution by applying an external voltage increases the complexity of the equipment and the difficulty of actual operation on the one hand, and on the other hand fails to completely solve the problem of microorganisms attaching and depositing on the iron filings bed.
[0005] To sum up, there are methods at home and abroad to put zero-valent iron into the anaerobic bioreactor through the iron filings bed to improve the treatment effect of the reactor, but none of the existing methods can completely solve the problem of microorganisms attaching and depositing on the iron filings bed. Problems leading to passivation of chip beds

Method used

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  • A technology for advanced biological treatment of wastewater

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Embodiment 1

[0021] According to the method of the present invention, a set of waste water biological advanced treatment device is formed, the effective volume of the treatment device is 25L, the carbon steel bars through alkali cleaning and pickling are placed around the stirring paddle of the treatment device, and the residence time is about 6h under the running state. The device adopts the middle mechanical Stirring mode, the stirring speed gradient is 20s -1 , the temperature of the wastewater in the reaction device is 28-33°C, the pH value is 6.0-7.2, and the oxidation-reduction potential is about -100mV. A conventional contact oxidation tank is installed behind the wastewater biological advanced treatment device, and the residence time of the contact oxidation tank is about 10 hours. The treatment object of the combined device is the effluent of propylene oxide wastewater after secondary primary sedimentation + activated sludge + contact oxidation process, which uses potassium dichro...

Embodiment 2

[0024] Form a set of wastewater biological advanced treatment device according to the method of the present invention, the effective volume of the treatment device is 50L, and the stirring paddle of the treatment device is placed around the common pig iron sheet, and the residence time is about 8h under the running state. The device adopts the middle mechanical stirring mode, and the stirring speed gradient is: 70s -1 In the running state, the temperature of the wastewater in the reaction vessel is 25°C, the pH is 7.0-9.0, and the oxidation-reduction potential is about -300mV. A conventional activated sludge biological treatment tank is placed after the low redox potential anoxic biological treatment device, and the residence time of the activated sludge tank is 8 hours. The treatment object of the combined device is the effluent of industrial wastewater treated by activated sludge process in a chemical industry park. It uses potassium dichromate as the oxidant to measure the ...

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Abstract

The invention discloses an advanced bio-treatment technology for wastewater, which can improve the biodegradability of the wastewater. According to the technology, through fixing reductive metal strips around the stirring paddle of an anoxic bioreactor and using mechanical stirring in combination, the reductive metal are reacted with oxidative matters such as dissolved oxygen in the wastewater to release metal ions slowly, thereby reducing the oxidoreduction potential of anoxic biological sludge in the reactor, and effectively improving the biodegradability to benefit the further biochemical treatment. The technology can be used for advanced treatment of wastewater discharged after routine biological treatment, and is an advanced wastewater bio-treatment technology of high efficiency, low cost, and convenient operation.

Description

technical field [0001] The invention relates to a wastewater biological advanced treatment technology capable of improving the biodegradability of wastewater (characterized by the biological oxygen demand / chemical oxygen demand ratio, namely the B / C ratio), and belongs to the technical field of wastewater biological treatment. Background technique [0002] In the field of waste and sewage treatment, compared with physical and chemical treatment methods such as coagulation sedimentation, adsorption, and Fenton, biological treatment technology is low in cost, easy to operate, and cost-effective. It is the most commonly used wastewater treatment technology, which mainly includes Aerobic, anoxic, anaerobic and anaerobic-aerobic methods. However, the effluent after conventional biological treatment has high dissolved oxygen (DO), low biological oxygen demand / chemical oxygen demand ratio (B / C ratio), and poor biodegradability, so it is generally difficult to carry out biological a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
Inventor 杨正平李潇潇孙爱国宋德平
Owner 东华(西藏)低碳科技有限责任公司
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