Method for treating soybean processing wastewater by utilizing photosynthetic bacteria and recycling wastewater

A technology for processing waste water and photosynthetic bacteria, which is applied in the field of waste water recycling, can solve the problems of low degree of waste water recycling, complex process, secondary pollution, etc., and achieve the effects of enhancing cell activity, saving energy consumption, and easy operation

Inactive Publication Date: 2013-04-17
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems caused by the pretreatment process in the traditional photosynthetic bacteria wastewater treatment process, such as complex process, low degree of sewage resource util

Method used

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  • Method for treating soybean processing wastewater by utilizing photosynthetic bacteria and recycling wastewater
  • Method for treating soybean processing wastewater by utilizing photosynthetic bacteria and recycling wastewater
  • Method for treating soybean processing wastewater by utilizing photosynthetic bacteria and recycling wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, sodium succinate was added to the soybean processing wastewater to a final concentration of 725 mg / L and ammonium sulfate to a final concentration of 400 mg / L;

[0027] Then adjust the pH value of soybean processing wastewater to 7.0;

[0028] Then add Rhodobacter sphaeroides to the soybean processing wastewater to a final concentration of 400 mg / L;

[0029] The treatment conditions are natural light, the treatment temperature is 25-30°C, and the treatment time is 96 hours; during the treatment process, micro-aeration is carried out into the soybean processing wastewater through the aeration pump, the aeration intensity is controlled by a flow meter, and a dissolved oxygen meter is used to control the aeration intensity. Real-time monitoring to control the dissolved oxygen concentration in soybean processing wastewater at 0.5~1.0 mg / L. The values ​​of COD, protein and bacteria production in sewage were measured every 24 hours.

Embodiment 2

[0031] First, sodium succinate was added to the soybean processing wastewater to a final concentration of 450 mg / L and ammonium sulfate to a final concentration of 300 mg / L;

[0032] Then adjust the pH value of soybean processing wastewater to 7.0;

[0033] Then add Rhodobacter sphaeroides to soybean processing wastewater to a final concentration of 819 mg / L;

[0034] The treatment conditions are natural light, the treatment temperature is 25-30°C, and the treatment time is 120 hours; during the treatment process, micro-aeration is carried out into the soybean processing wastewater through the aeration pump, the aeration intensity is controlled by a flow meter, and a dissolved oxygen meter is used to control the aeration intensity. Real-time monitoring to control the dissolved oxygen concentration in soybean processing wastewater at 0.5~1.0 mg / L. The values ​​of COD, protein and bacteria production in sewage were measured every 24 hours.

Embodiment 3

[0036] First, sodium succinate was added to the soybean processing wastewater to a final concentration of 1000 mg / L and ammonium sulfate to a final concentration of 1500 mg / L;

[0037] Then adjust the pH value of soybean processing wastewater to 7.0;

[0038] Then add Rhodobacter sphaeroides to the soybean processing wastewater to a final concentration of 1214 mg / L;

[0039] The treatment conditions are natural light, the treatment temperature is 25-30°C, and the treatment time is 120 hours; during the treatment process, micro-aeration is carried out into the soybean processing wastewater through the aeration pump, the aeration intensity is controlled by a flow meter, and a dissolved oxygen meter is used to control the aeration intensity. Real-time monitoring to control the dissolved oxygen concentration in soybean processing wastewater at 0.5~1.0 mg / L. The values ​​of COD, protein and bacteria production in sewage were measured every 24 hours.

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Abstract

The invention discloses a method for treating soybean processing wastewater by utilizing photosynthetic bacteria and recycling the wastewater, and belongs to the technical field of wastewater treatment. The method comprises the steps as follows: adding small molecular carbon source substances with the final concentration of 400-1200 mg/L and small molecular nitrogen source substances with the final concentration of 200-2000 mg/L into the soybean processing wastewater at first; adjusting the pH value of the wastewater to be 7.0-9.0; adding rhodobacter sphaeroides with the final concentration of 400-1500 mg/L during logarithmic growth phase into the wastewater; treating for 96-120 h at the temperature of 25-30 DEG C; and micro-aerating in the wastewater and controlling the dissolved oxygen concentration in the soybean processing wastewater to be 0.5-1.0 mg/L during the treatment process. According to the method, the energy consumption is reduced, the process of treating sewage with the photosynthetic bacteria is simplified, a large amount of bacterial resources capable of being directly and comprehensively utilized are produced, and the problem of secondary pollution is avoided, so that the sewage recycling rate is increased.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating soybean processing wastewater by using photosynthetic bacteria and realizing recycling of wastewater. 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, rich in macromolecular nutrients such as polysaccharides, proteins and cellulose. Known soybean processing wastewater treatment methods include coagulation sedimentation, catalytic oxidation, physicochemical-hydrolytic acidification-contact oxidation method, upflow anaerobic sludge bed, etc., but these methods will generate a large amount of excess sludge during use, and the The cost of treatment and disposal is high, the degree of resource utilization is low, and it is easy to cause secondary pollution. [0003] The use of phot...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/02
CPCY02W10/10
Inventor 卢海凤张光明张盼月张源辉李保明
Owner CHINA AGRI UNIV
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