Cassava Starch Wastewater Treatment Plant
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Phone
+86-158 6303 7696
+86-139 6390 1909
cnrunyuan@gmail.com
Cassava Starch Wastewater Treatment Plant
Wastewater Quality Characteristics
Producing 1 ton of finished cassava starch consumes 15 to 40 cubic meters of water. The wastewater is divided into four types, cassava washing wastewater (50% of total water volume), primary separation wastewater (25% of total water volume), yellow slurry/protein separation wastewater (25% of total water volume, highest pollution load) and auxiliary wastewater includes equipment flushing water, floor cleaning water, filter press filtrate and cooling water.
(1) PH value ranges from 3.8 to 5.2; the wastewater is prone to acidification and fermentation, resulting in black color and foul odor.
(2) The BOD₅/COD ratio is 0.4–0.57, indicating excellent biodegradability.
(3) High suspended solids (SS) mainly composed of colloidal starch and protein, which are extremely difficult to settle naturally.
(4) Cassava tubers contain cyanogenic glycosides that leach out after crushing. High concentrations of cyanide inhibit anaerobic methanogens and cause poisoning and collapse of biochemical systems.
(5) Overall characteristics: high organic load, high suspended solids, strong acidity, dramatic seasonal water flow fluctuations, biotoxic cyanides, severe foaming during gas generation and large sludge output.
Typical Treatment Process
Technical Features
(1) Custom-designed sand sedimentation tank removes massive sediment from cassava washing to prevent equipment abrasion.
(2) Dedicated hydrolysis acidification tank degrades macromolecular starch and partially decomposes cyanides to reduce biological toxicity.
(3) Primary sedimentation tank combined with dissolved air flotation captures suspended starch, protein and colloids. Floating scum and bottom sludge are filter-pressed to produce cassava yellow protein feed for improved economic benefits.
(4) Anaerobic process recovers abundant biogas, which can be directly supplied to boilers for heating and biogas power generation to offset the plant’s steam and electricity costs.
(5) This process is also applicable to wastewater treatment of African yams, tubers, taro, potatoes and corn starch production.
EPC Services Provided
(1) Free preliminary technical consultation
(2) Process design
(3) Complete set equipment supply
(4) Installation guidance
(5) Commissioning guidance
+86-158 6303 7696
cnrunyuan@gmail.com
Phone
+86-158 6303 7696
+86-139 6390 1909
Address
Room 810, Building 1, Hisense Caizhi Valley, No. 88, Zhuzhou Road, Qingdao, Shandong, China