Treatment of the Wastewater From the Alkaline Cooking of Maize in an RBC System

by Simón González-Martínez, Natl Autonomous Univ of Mexico, Inst, of Engineering, Mexico City, Mexico,
Ruth Pedroza-de-Brenes, Natl Autonomous Univ of Mexico, Inst, of Engineering, Mexico City, Mexico,
Carmen Durán-de-Bazúa, Natl Autonomous Univ of Mexico, Inst, of Engineering, Mexico City, Mexico,
Miryoussef Norouzian, Natl Autonomous Univ of Mexico, Inst, of Engineering, Mexico City, Mexico,



Document Type: Proceeding Paper

Part of: Environmental Engineering

Abstract: The liquid waste resulting from cooking and washing of maize is called nejayote or nexayote. The soluble COD concentration of this waste ranges from 10,000 to 20,000 mg/l. In an effort to study the treatability of this specific waste while obtaining useful by-products, single cell protein, an experiment was initiated using a bench-top RBC system. The results show that the maximum removal efficiency reached was 85 percent as COD and 96 percent as BOD//5 with an organic surface loading rate of 3. 7 lbCOD/l000sqft/d (0. 018 kgCOD/m**2 multiplied by (times) d) under a hydraulic retention time of 2. 5 days. The overall results indicate that the RBC system can be used as a treatment alternative if the effluent is recycled and reused for cooking and washing in maize processing and as a source of waste single cell protein susceptible of being employed in animal feeds. (Edited author abstract. )

Subject Headings: Crops | Recycling | Waste treatment | Oxygen demand | Industrial wastes | Wastewater treatment | Solubility

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