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Wastewater Treatment of Starch and Starch Derivatives
Author：goobsy Renew time：2020-02-22
Starch and starch derivative wastewater includes sweet potato starch, potato starch, tapioca starch, corn starch, wheat starch and the like, as well as wastewater generated in the production process of various starch sugar derivatives and alcohol derivatives.
When corn starch is used as raw material to produce starch, the waste water mainly comes from the drainage after protein recovery in corn soaking, germ separation and washing, fiber washing, flotation concentration, protein filter pressing and other sections, as well as the evaporation condensed water generated during the recovery of corn soaking water resources. When potato is used as raw material to produce starch, the waste water mainly comes from the drainage after protein recovery in juice removal, separation and dehydration sections, as well as the raw material conveying and cleaning waste water. When wheat is used as raw material to produce starch, the waste water consists of two parts: the supernatant in the settling tank and yellow serofluid produced after centrifugation. When starch is used as raw material to produce starch sugar, waste water mainly comes from washing water of ion exchange column, washing water and washing water of various equipment, cooling water of liquefaction and saccharification process.
Wastewater contains a large number of soluble organic pollutants, such as starch, protein, sugar, carbohydrate, fat, amino acid, etc., followed by inorganic compounds containing N and P, which are generally non-toxic, but the COD concentration is very high, CODcr is basically above 10,000 mg/L, which belongs to high-concentration organic wastewater with good biodegradability, and the suspended substance and colloidal protein content of wastewater are high, and protein can be recycled. Seasonal production of sweet potato, potato and other starches.
Henan Gubo Industrial Co., Ltd. has unique technical advantages in the treatment of high-concentration organic wastewater containing starch. Combined with our many years of practical experience in starch wastewater, according to the nature and current technical status of this kind of production wastewater, our company adopts the process of "protein recovery pretreatment +SRIC anaerobic reactor+multistage A/O activated sludge process+advanced treatment" to treat this kind of wastewater. The process has the advantages of low energy consumption, stable effluent quality, short debugging period, low operation and maintenance cost, and recovery of protein in wastewater. SRIC anaerobic reactor can produce biogas and granular sludge. Biogas is used for combustion or power generation, and granular sludge can be sold, bringing considerable economic benefits to enterprises.