Starch wastewater treatment method

Abstract

The invention relates to a starch wastewater treatment method. The method is characterized by comprising the following steps: 1) discharging production wastewater into an adjusting tank through a mechanical grid, continuously stirring through a stirring device in the adjusting tank to prevent deposition, introducing water current into an air floatation tank and simultaneously adding flocculants polyaluminum chloride and polyacrylamide; and 2) letting an effluent from the air floatation tank flow into an anaerobic reactor, adjusting operation pH value of the anaerobic reactor to 7-8, discharging sludge generated by the anaerobic reactor into a sludge concentration basin, letting an effluent flow into a preaeration sedimentation basin, letting an effluent from the preaeration sedimentation basin enter a SBR reactor and carrying out aerobic biological treatment, and discharging sludge from the preaeration sedimentation basin and a SBR reaction tank into the sludge concentration basin. The method has a good wastewater treatment effect, and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a starch wastewater treatment method. Background technique [0002] The starch industry uses corn, potatoes, wheat, rice and other agricultural products as raw materials to produce starch or starch deep-processed products (starch sugar, glucose, starch derivatives, etc.). During the production process, the water demand is large and the waste water discharge is also large. , and the wastewater is high-concentration organic wastewater containing a large amount of starch, protein, sugar, fat and other organic matter. After entering the water body, the dissolved oxygen in the water is quickly consumed, causing the water body to be hypoxic and affecting the survival of fish and other aquatic animals. At the same time, the wastewater Suspended solids are easy to decompose under anaerobic conditions to produce odor and deteriorate water quality. In addition, my country's st...

AI Technical Summary

Problems solved by technology

[0002] The starch industry uses corn, potatoes, wheat, rice and other agricultural products as raw materials to produce starch or starch deep-processed products (starch sugar, glucose, starch derivatives, etc.). During the production process, the water demand is large and the waste water discharge is also large. , and the wastewater is high-concentration organic wastewater containing a large amount of starch, protein, sugar, fat and other organic matter. After entering the water body, the dissolved oxygen in the water is quickly consumed, causing the water body to be hypoxic and affecting the survival of fish and other aquatic animals. At the same time, the wastewater Suspended solids are easy to decompose under anaerobic conditions to produce odor and deteriorate water quality. In addition, my country's starch production technology is relatively backward, and the utilization rate of resources is low. It not only affects environmental sanitation, but also causes huge waste