Treatment process for garlic processing wastewater

Abstract

The invention discloses a treatment process for garlic processing wastewater. The treatment process for garlic processing wastewater comprises a pretreatment process and a biological treatment process. The pretreatment process comprises the following steps: separately collecting garlic slice cleaning wastewater, and combining and collecting other processing wastewater, wherein the garlic slice cleaning wastewater is collected in a water collecting tank, and the other processing wastewater is collected into a water gathering tank; respectively pumping the garlic slice cleaning wastewater and the other processing wastewater into respective microfilters for mechanical screening; after treatment by the microfilters, allowing the garlic slice cleaning wastewater and the other processing wastewater to enter respective sedimentation tanks for gravity sedimentation respectively; allowing precipitates settled from the garlic slice cleaning wastewater and precipitates settled from the other processing wastewater to enter respective sludge tanks; and gathering liquid supernatants of the two sedimentation tanks into an adjusting tank for the later biological treatment process. The garlic processing wastewater is divided according to quality, so the removal rate of allicin can be increased; no chemical agent is added in the whole process, so no chemical sludge is generated; and generated sludge is easy to treat and dispose and can be used as agricultural fertilizer or greening fertilizer.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a garlic processing wastewater treatment process. Background technique [0002] At present, the products processed from garlic mainly include garlic rice, garlic flakes, garlic powder, etc. During the processing, washing is required to produce a large amount of wastewater, which contains a large amount of organic pollutants, suspended solids, and ammonia nitrogen. At the same time, because the sliced ​​garlic needs to be sliced ​​during processing, the garlic slice washing wastewater contains the colloidal juice that flows out of the sliced ​​garlic, namely allicin. The strong bactericidal effect of allicin makes it difficult to meet the discharge standard of wastewater by biochemical treatment alone. Therefore, pretreatment is required before garlic water enters biochemical treatment, that is, try to remove most of allicin in wastewater. [0003] At pre...

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Problems solved by technology

[0003] At present, physical and chemical methods are often used for the pretreatment of garlic wastewater, mainly including micro-electrolysis, chemical agent oxidation, coagulation sedimentation and coagulation air flotation, etc. Although these methods can effectively remove most of the allicin, without exception The land needs to add aluminum and iron chemicals to the wastewater, which will cause secondary pollution, not only increase the content of inorganic salts in the water, but also produce chemical sludge that cannot be used as agricultural fertilizer or green fertilizer, which is difficult to handle and dispose of

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