Aerobic treatment of maize-processing wastewater in a 50-liter rotating biological reactor

R. Pedroza-Islas, C. Durán de Bazúa
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引用次数: 13

Abstract

Corn (maize)—processing effluents, known as nejayote, were aerobically treated in a 50-liter laboratory-scale rotating biological reactor. Removal of organic compounds, evaluated as chemical and biochemical oxygen demand (COD and BOD), as well as reducing sugars, was monitored. Operating conditions were: feed COD, 6·4 g/liter; rotational disc speed, 16 rpm; hydraulic retention time, 2·5 days. A comparison with previous experiments, carried out in a 150liter reactor, to consider scaling-up effects (1:3) was performed. Final COD removal was 84·6%. The application of an exponential model to reducing-sugars degradation was highly satisfactory, and the value of the constant was −0·352. Generated biomass was bromatologically evaluated, and average results in per cent of total dry biomass were: protein content, 41·5; fat, 3·4; fiber, 14·8; ash, 15·1.

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玉米加工废水在50升旋转生物反应器中的好氧处理
被称为nejayote的玉米(玉米)加工废水在一个50升实验室规模的旋转生物反应器中进行好氧处理。有机化合物的去除,评估为化学和生化需氧量(COD和BOD),以及还原糖,监测。操作条件为:饲料COD为6·4 g/l;旋转盘速度,16转/分;液压保持时间,2.5天。与先前在150l反应器中进行的实验进行了比较,以考虑放大效应(1:3)。最终COD去除率为84.6%。指数模型在还原糖降解中的应用非常满意,该常数的值为- 0·352。对所产生的生物量进行了色谱学评估,平均结果占总干生物量的百分比为:蛋白质含量,41.5;脂肪,3·4;纤维、14·8;灰,15 * 1。
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