Anaerobic treatment process for organic wastewater

Abstract

The invention relates to an anaerobic treatment process of organic wastewater, which comprises the following steps: pretreating the organic wastewater by a pretreatment system, feeding the treated wastewater into an anaerobic fermentation tank, and stirring for anaerobic fermentation; then storing biogas generated in the anaerobic fermentation tank into a biogas storage tank, dehydrating and desulfurizing one part of the biogas in the biogas storage tank through a dehydration and desulfurization device, then recycling the biogas, and aerating the other part of the biogas in a concentration separator; then enabling effluent of the anaerobic fermentation tank to enter a concentration separator, aerating with biogas and carrying out anaerobic biological contact treatment, meanwhile, recyclinganaerobic sludge in the concentration separator back to the anaerobic fermentation tank for repeated fermentation, and discharging and treating sludge at the bottom of the anaerobic fermentation tankat regular intervals; finally, discharging the biogas used for aeration through a gas outlet of the concentration separator and recycling the biogas into the biogas storage tank, and disinfecting effluent separated by the concentration separator by a disinfection tank and then recycling. The process can solve the problems that most anaerobic process inlet water at present is greatly influenced bySS, the internal structure is complex, adding of high-price fillers and the like is needed by some processes.

Description

technical field [0001] The invention relates to the field of sewage purification, in particular to an anaerobic treatment process for organic waste water. Background technique [0002] Industrial organic wastewater such as domestic sewage, food processing, and papermaking contains organic substances such as carbohydrates, proteins, oils, and lignin. These substances exist in the sewage in a suspended or dissolved state and can be decomposed by the biochemical action of microorganisms. Oxygen-depleting pollutants are called oxygen-depleting pollutants because they consume oxygen during their decomposition. This pollutant can reduce dissolved oxygen in the water, affecting the growth of fish and other aquatic organisms. After the dissolved oxygen in the water is exhausted, the organic matter undergoes anaerobic decomposition, producing unpleasant odors such as hydrogen sulfide, ammonia, and mercaptans, which deteriorates the water quality and also causes adverse effects on t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an anaerobic treatment process for organic wastewater, which solves the problems that the influent of most anaerobic processes is greatly affected by SS, the internal structure is complex, and some processes need to add expensive fillers.

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