Method for purifying piggery fermentation wastewater by using Chlorella

A technology for fermenting waste water and chlorella, applied in the direction of using microorganisms, chemical instruments and methods, methods based on microorganisms, etc., can solve the problems of polluting the environment and not being economical, and achieve the effect of directly discharging polluted environment

Inactive Publication Date: 2017-08-18
INST OF AQUATIC LIFE ACAD SINICA +1
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  • Abstract
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Problems solved by technology

[0004] The invention proposes a method for using chlorella to purify pig farm fermentation waste water, which solves the problem that the current pig farm fermentation waste water is not economical or directly discharged to pollute the environment

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  • Method for purifying piggery fermentation wastewater by using Chlorella

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Embodiment

[0019] (1) After solid-liquid separation of pig farm fermentation wastewater, the clear liquid enters the aeration tank for aeration. After 48h aeration, it enters the sedimentation tank. The precipitation time is 2h. The supernatant enters the disinfection tank with 15g / m 3 Disinfect with strong chlorinate, aerate for 30min after 16h, add sodium thiosulfate 2.5 times the mass of strong chlorinate to neutralize, then enter the regulating tank to adjust the pH to 7 and use tap water to adjust the wastewater concentration.

[0020] (2) The fermented wastewater of the pig farm after the above treatment starts from a low concentration, and in turn domesticates chlorella in wastewater with a concentration of 20-100% by volume. The chlorella is cultivated on a shaker in a constant temperature culture room. The temperature is 23-26°C, the rotating speed of the shaker is 180rmp / min, and the illumination is 3000-4000lux. Finally, the algae species that can grow rapidly in the fermentation w...

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Abstract

The invention provides a method for purifying piggery fermentation wastewater by using Chlorella, which comprises the following steps: (1) pretreating piggery fermentation wastewater, and adjusting pH to 6.5-7.5 and wastewater concentration in an adjusting tank; (2) acclimating and culturing Chlorella in wastewater to ultimately obtain a Chlorella strain which can rapidly grow in 50-70% (v/v) wastewater; (3) inoculating the acclimated Chlorella strain into wastewater, and culturing in a closed type photobioreactor; and (4) collecting Chlorella, and thus finishing wastewater treatment. The method of the invention uses Chlorella with high adaptability to purify piggery fermentation wastewater, can remove TN, TP and COD in wastewater, and solves the problem that in the prior art, the piggery fermentation wastewater is treated in an uneconomic traditional method or directly discharged to cause environmental pollution. In addition, the collected Chlorella can be used for other purposes to generate certain economic benefits.

Description

Technical field [0001] The invention relates to a method for purifying fermentation wastewater of a pig farm by using chlorella. Background technique [0002] With the development of the economy, the business model of the pig industry tends to be large-scale, develops rapidly, and the amount of wastewater discharge is also increasing, and the environmental problems that follow are becoming more and more serious. Fermentation of pig farm wastewater to produce biogas is a common way to treat wastewater in intensive pig farms, but the biogas slurry after fermentation is still high-concentration organic wastewater and cannot meet the discharge standards. The treatment methods of biogas slurry after fermentation include constructed wetland method, biological pond method and MBR reactor treatment, but these methods are difficult to apply in practice due to the high cost and other problems. Therefore, the main form of fermentation wastewater treatment in pig farms is simple Directly di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C12N1/36C12N1/12C02F103/20C02F3/32C12R1/89
CPCC02F3/322C02F1/50C02F1/5245C02F1/66C02F7/00C02F9/00C02F2001/007C02F2103/20C02F2209/06C02F2209/08C02F2209/16C02F2301/08C12N1/12C12N1/36
Inventor 黄开耀徐磊邓璇
Owner INST OF AQUATIC LIFE ACAD SINICA
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