Soybean wastewater biochemical treatment process and device

Abstract

The invention relates to a soybean wastewater biochemical treatment process and a soybean wastewater biochemical treatment device. The process comprises the following steps and the device comprises the following composition that wastewater sequentially flows through a regulating tank, a hydrolysis acidification pool, an anaerobic tank, a biological synchronous degradation tank and a sludge-water separation device; by the hydrolysis acidification pool, particles and macromolecules are hydrolyzed into soluble substances and COD (Chemical Oxygen Demand) degradation is carried out; when methane is generated in the anaerobic tank, COD degradation is carried out in the anaerobic tank; the biological synchronous degradation tank adopts low dissolved oxygen aeration to carry out synchronous degradation of COD and N; mixed solution at the tail end of the biological synchronous degradation tank flows back to the water inlet end and part of the mixed solution is lifted to the sludge-water separation device; clear water subjected to sludge-water separation reaches the standard and is discharged, sludge flows back to the water inlet end of the hydrolysis acidification pool; and residual sludge is discharged into a sludge treatment system. The soybean wastewater biochemical treatment process and the soybean wastewater biochemical treatment device has the benefits that the whole biochemical treatment process and the biological synchronous degradation of COD and N are adopted; treated effluent reaches the A-level emission standard of 'Integrated Wastewater Discharge Standard'(GB8978-1996); and the soybean wastewater biochemical treatment process and the soybean wastewater biochemical treatment device solve the problems that in the soybean wastewater treatment, N exceeds the standard, the sludge quantity is large and cost is high.

Description

technical field [0001] The invention relates to a wastewater treatment process and device, in particular to a biochemical treatment process and device for bean product wastewater, which is a process and device for synchronously degrading COD and N in bean product wastewater by using microorganisms. Background technique [0002] Soy product wastewater is the wastewater generated during the processing of soybeans into soybean products. The main components of soybean product wastewater are: yellow swill, soaking water, and flushing wastewater; the main pollutant components of soybean product wastewater are: bean dregs, oil, protein, and fiber polysaccharides. The main characteristics of soybean product wastewater are: the concentration of COD and N is very high, and the COD of comprehensive wastewater Cr 5500~10000mg / L, BOD 5 3000~5000mg / L, total nitrogen 200~500mg / L. Substandard discharge of soybean product wastewater treatment will lead to eutrophication of the water body ...

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Problems solved by technology

However, due to the narrow range of low dissolved oxygen controlled by these processes and devices (0.1-0.5 mg/L), the degr

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