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Method for processing and recycling soybean processing wastewater through photosynthetic bacteria

A technology for processing wastewater and photosynthetic bacteria, which is applied in the field of resource utilization, can solve problems such as low degree of sewage resource utilization, serious secondary pollution, and complex process flow, and achieve the effects of simplifying process flow, improving activity, and avoiding secondary pollution

Inactive Publication Date: 2016-04-06
RENMIN UNIVERSITY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of complex process flow, low degree of sewage resource utilization and serious secondary pollution caused by pretreatment in the traditional photosynthetic bacteria wastewater treatment process, the present invention proposes a method that can effectively treat soybean processing wastewater and realize resource utilization of soybean processing wastewater Methods

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  • Method for processing and recycling soybean processing wastewater through photosynthetic bacteria

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Effect test

Embodiment 1

[0020] In this embodiment, the effect of the invention is tested with soybean processing wastewater. The initial COD concentration of soybean processing wastewater was 8250mg / L.

[0021] First, add small molecule carbon source substances to the soybean processing wastewater to a final concentration of 400mg / L;

[0022] Then adjust the pH value of the waste water to be 7.5;

[0023] Then add Rhodobacter sphaeroides to the waste water to a final concentration of 630mg / L;

[0024] The treatment conditions are as follows: the treatment temperature is 25°C, and the treatment time is 120 hours; an incandescent lamp is used as an external light source, and the external light intensity is controlled to be 4500~5000 lux; the aeration pump is used to aerate the sewage, and the dissolved oxygen concentration in the sewage is controlled to be 1.0mg / L; Measure the COD concentration in sewage every 24 hours.

Embodiment 2

[0026] The initial COD concentration of soybean processing wastewater in this comparative example was 15455mg / L, and the final concentration of adding small molecule carbon source material was 1200mg / L, and the final concentration of adding Rhodobacter sphaericus was 1850mg / L. Except that the initial COD concentration is different, the operating method and operating conditions of this comparative example and Example 1 are exactly the same.

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Abstract

The invention discloses a method for processing and recycling soybean processing wastewater through photosynthetic bacteria, and belongs to the technical field of sewage processing. Soybean processing wastewater is processed through Rhodobacter sphaeroides, and small-molecular carbon source substances are added to the soybean processing wastewater till the final concentration is 400-1200 mg / L; the pH value of the wastewater is then adjusted to be 7.0-9.0; Rhodobacter sphaeroides in the logarithmic phase is put in wastewater till the final concentration is 600-1900 mg / L; processing is conducted for 96-120 hours at a temperature of 25-30 DEG C; meanwhile, the external illumination intensity is controlled to be 4500-5000 lux by an incandescent light bulb, and the oxygen dissolution concentration in sewage is controlled to be 0.5-1.0 mg / L. The method is easy to operate, the technological procedure is simplified, the sewage recycling degree is improved, the problem of secondary pollution caused by a traditional sewage processing process is solved, and sewage recycling can be achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a method for treating soybean processing wastewater by using photosynthetic bacteria and realizing recycling. Background technique [0002] Soybean processing wastewater is a type of wastewater with a large amount of discharge in the food processing industry. Soybean processing wastewater is non-toxic and harmless, and is rich in macromolecular nutrients such as macromolecular polysaccharides, protein, and cellulose. Known soybean processing wastewater treatment methods include coagulation sedimentation, catalytic oxidation, physicochemical-hydrolytic acidification-contact oxidation method, UASB, etc., but the use of these methods will generate a large amount of excess sludge, high treatment and disposal costs, and low degree of resource utilization , and easily cause secondary pollution. Studies have proved that photosynthetic bacteria can treat and realize resource u...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F103/32
CPCC02F3/34C02F2103/32
Inventor 张光明彭猛卢海凤王航瑶杨安琪
Owner RENMIN UNIVERSITY OF CHINA
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