Composite bacterium and application thereof to treatment of garlic processing wastewater

Abstract

The invention discloses a composite bacterium, which can be used for the degradation of COD (Chemical Oxygen Demand) and / or organic sulfides and pretreatment for the degradation of garlic processing wastewater. The composite bacterium is obtained by mixing fermentation broth of bacillus megaterium, pseudomonas stutzeri, aspergillus oryzae, klebsiella oxytoca and desulfovibrio desulfuricans, of which bacterial cell concentrations are 20 to 30 percent, 10 to 15 percent, 15 to 35 percent, 10 to 35 percent and 5 to 15 percent respectively. The composite bacterium can be applied to the degradation of COD and / or organic sulfides, and can also be applied to the pretreatment for the degradation of the garlic processing wastewater. By such a biological pretreatment method for the degradation of the garlic processing wastewater, the influence of changes in the conditions of COD and organic sulfide concentrations, water volumes and the like on a degradation effect can be reduced, and use of a plurality of chemical reagents in a subsequent process can be reduced and even avoided; the pretreated wastewater can be discharged up to the standard in an activated sludge treatment system.

Description

technical field [0001] The invention relates to a composite bacterial agent, in particular to a composite bacterial agent that can be applied to COD degradation, organic sulfide degradation, and garlic processing wastewater degradation pretreatment, and belongs to the field of industrial microorganisms. Background technique [0002] Garlic processing wastewater is wastewater discharged from natural garlic processing and production. Garlic processing wastewater is mainly composed of natural organic matter (such as polysaccharides, lipids, etc.), does not contain toxic substances, and has many biodegradable components. Although garlic processing wastewater does not contain toxic substances, it contains a large amount of biodegradable organic substances, and the COD content is about 20000mg / L. If it is directly discharged into the water body without treatment, it will consume a large amount of dissolved oxygen in the water, resulting in the lack of oxygen in the water body and...

AI Technical Summary

Problems solved by technology

Decomposed under anaerobic conditions, the organic sulfides rich in garlic processing wastewater produce special odor, which seriously pollutes the environment

[0003] Garlic processing wastewater is generally treated by traditional biochemical methods, but there are inherent disadvantages: 1. Garlic processing wastewater is a very special kind of wastewater, in which allicin is a broad-spectrum fungicide, and it is treated by ordinary activated sludge aeration method , allicin has a strong inhibitory effect on active bacteria, reduces sludge activity, and the degradation ability of COD in water is very poor

2. The COD of garlic processing wastewater is about 20000mg / L, which is much higher than the tolerance of activated sludge (<3000mg / L). The raw wastewater can be used after being diluted 10-20 times, and each ton of garlic slices consumes about 20-40 cubic meters of tap water, resulting in a serious waste of water resources.

However, a large amount of hazardous chemicals such as acids, alkalis, PACs, PAMs, and fenton reagents are used in the process, which poses a huge threat to the environment and also brings pressure to subsequent biochemical treatments. A large number of chemical reagents and iron-carbon materials are produced every year. The consumption of water also greatly increases the cost of water treatment

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