The starch wastewater of this project has a BOD/COD value of more than 0.4 and is biodegradable. Therefore, it is suitable to adopt a biological treatment process to ensure that the organic pollutants are reliably reduced to the required level at the lowest possible cost. The anaerobic process uses a high-load EGSB process with a small footprint and low investment. From the operation results, the process is reliable and the effluent is stable.

The integrated sewage treatment device for starch wastewater treatment is suitable for: potato, sweet potato starch, starch deep processing, wheat starch processing, flour processing.

The starch industry is an industry that produces starch or starch deep-processed products (starch sugar, glucose, starch derivatives, etc.) from agricultural products such as corn, potato, wheat, and rice. The starch industry needs about 1.7 tons of raw materials to get 1t products. In the production process, the water demand is large, the wastewater discharge is also large, and the wastewater is organic wastewater containing a large amount of organic matter such as starch, protein, sugar, fat and the like. The small-scale starch processing sewage treatment integrated buried device, if not directly treated into the water body, will cause the water body to be deprived of oxygen, causing aquatic animals to suffocate, causing great harm to the environment.

Starch sewage source:

1. Corn starch production process: corn→sieving→soaking (recovering corn syrup)→grinding→germ separation (germ compressible corn oil)→grinding→sieving (powder can be used as feed)→precipitation separation (separation of zein ) → starch washing → dehydration → drying → starch.

The main source of starch wastewater is dry corn conveying washing water, corn soaking water, germ separation, yellow pulp wastewater and other process water. In addition, there is less ground washing water.

2, Ganmu starch production process: sweet potato, washing → grinding → sieving (paste for feed) → slurry → centrifugation (recovering protein in yellow pulp water) → starch washing → dehydration → drying → starch.

Starch sewage mainly comes from the clear water in the sedimentation tank and dewatering in the centrifuge.

Principle analysis of integrated buried plant for small starch wastewater treatment:

Water volume: 250 tons / day

Starch sewage in and out water quality: project CODCr (mg / L) BOD5

(mg/L) SS (mg / L) pH pretreatment water 15000640010004.0 ~ 5.5 discharge standard 5003004006 ~ 9 starch sewage treatment process:

Potato starch wastewater + mechanical grid + conditioning pool + defoaming pool + primary sink + cistern + air flotation + intermediate pool + UASB + blow off pool + first-level contact oxidation tank + anoxic pool + secondary contact oxidation tank + Coagulation sedimentation tank + effluent