Multistage anaerobic system for treating waste vegetable pulp

Abstract

The invention discloses a multistage anaerobic system for treating waste vegetable pulp. The multistage anaerobic system comprises a pretreatment unit, an ethanol fermentation type acid-producing phase reactor, an intermediate sedimentation tank, a sludge dewatering system, an air stripping tank, a methane-producing phase reactor and an aerobic treatment unit, wherein the pretreatment unit is connected with the ethanol fermentation type acid-producing phase reactor through a pipeline, and a pump body is arranged in the pipeline to provide power; the ethanol fermentation type acid-producing phase reactor is communicated with the intermediate sedimentation tank; the bottom of the intermediate sedimentation tank is communicated with a sludge dewatering system, the top of the intermediate sedimentation tank is communicated with an air stripping tank, the air stripping tank is communicated with a methane-producing phase reactor through a pipeline, a pump body is arranged in the pipeline to provide power, and a return pipe is arranged between the air stripping tank and the methane-producing phase reactor; and the methane-producing phase reactor is communicated with an aerobic treatment unit. Under the condition that a metal coagulant is not added, pollutants in the high-concentration organic wastewater can be removed, and the treatment effect is stable and efficient.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a multi-stage anaerobic system for treating tail vegetable slurry. Background technique [0002] In food processing and other production processes, a certain amount of high-concentration organic wastewater is often discharged, especially tail vegetable slurry, which contains a large amount of carbohydrates, proteins, oils and lignin in colloidal or dissolved forms. Substances, if discharged directly, will cause serious pollution to the environment. [0003] The treatment of high-concentration tail vegetable slurry organic wastewater often adopts the combination of pretreatment and anaerobic-aerobic treatment process. Practice has shown that this process can effectively remove pollutants in wastewater. However, for some wastewater, due to the high sugar content in the wastewater, a large amount of alkalinity will be consumed in the anaerobic process, so a large amount of alka...

AI Technical Summary

Problems solved by technology

However, for some wastewater, due to the high sugar content in the wastewater, a large amount of alkalinity will be consumed in the anaerobic process, so a large amount of alkaline substances need to be added, resulting in high operating costs; Or wastewater with more colloidal substances, because coagulation sedimentation or air flotation methods are often used for pretreatment, a large amount of chemical sludge that is difficult to handle will be generated, causing secondary pollution

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