Method of treating and recycling food processing waste water by using photosynthetic bacterium

A technology for food processing wastewater and photosynthetic bacteria, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of low degree of resource utilization and secondary pollution, and achieve simplified process Process, promote growth, improve the efficiency of sewage treatment and the degree of sewage recycling

CN103058387AInactive Publication Date: 2013-04-24CHINA AGRI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-04-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method of treating and recycling food processing waste water by using a photosynthetic bacterium, which belongs to the technical field of sewage treatment. The method comprises the following steps: adding a micro-molecular carbon source substance into food processing waste water until a final concentration of the micro-molecular carbon source substance is 160 to 2000 mg / L and adding a micro-molecular nitrogen source substance into the food processing waste water until a final concentration of the micro-molecular nitrogen source substance is 55 to 1000 mg / L; adjusting the pH value of the waste water to be 7.0 to 9.0; then adding Rhodopseudomonas palustris in a logarithmic phase into the waste water until a final concentration of Rhodopseudomonas palustris is 240 to 2000 mg / L; carrying out treatment at a temperature of 25 to 30 DEG C for 96 to 120 h; and controlling externally applied illumination intensity to be 500 to 1500 lux by using an electric incandescent lamp and controlling the concentration of dissolved oxygen in the waste water to be 0.5 to 1.0 mg / L. The method provided by the invention is simple and easily practicable, enables process flow to be simplified and a recycling degree of sewage to be improved, the problem of secondary pollution in traditional sewage treatment processes is avoided, and energy consumption is lowered down.
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Description

technical field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for utilizing photosynthetic bacteria to treat food processing wastewater and realize resource utilization. Background technique

[0002] Food processing wastewater is a type of wastewater with a large discharge volume at present. Food processing wastewater is non-toxic and harmless. Its components are mainly macromolecular nutrients such as starch, protein, colloid, and cellulose. It is a type of wastewater rich in carbon and nitrogen. The known food processing wastewater treatment methods are mainly biological methods, including activated sludge method, biological turntable method and UASB, etc. However, these traditional methods have complex technological processes and produce a large amount of residual sludge. The treatment and disposal cost of excess sludge is high, and the degree of resource utilization is low; and the odor generated by the a...

Examples

Embodiment 1

[0024] In this embodiment, pectin processing wastewater is used as a representative wastewater rich in carbon source substances in food processing wastewater to test the effect of the invention. The initial COD concentration of pectin processing wastewater was 8319 mg / L.

[0025] First, add the small molecule carbon source substance potassium sodium tartrate to a final concentration of 600 mg / L and the small molecule nitrogen source substance ammonium chloride to a final concentration of 200 mg / L to the pectin processing wastewater;

[0026] Then adjust the pH value of pectin processing wastewater to 7.0~9.0;

[0027] Then add Rhodopseudomonas palustris to the pectin processing wastewater to a final concentration of 360 mg / L;

[0028] The treatment conditions are as follows: the treatment temperature is 25-30°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 500-1500 lux; the ...

Embodiment 2

[0030] In this embodiment, milk processing wastewater is used as representative wastewater rich in nitrogen source substances in food processing wastewater to test the effect of the invention. The initial COD concentration of milk processing wastewater was 8032 mg / L.

[0031] The operating method and operating conditions of the test are the same as in Example 1.