燃料乙醇废醪液处理工艺技术进展

Technical Progress in the Treatment of Waste Mash in Fuel Ethanol Production

燃料乙醇废醪液是一种高浓度有机废水,处理量大,过程复杂,节能潜力大。分别对甘蔗、玉米和木薯生产燃料乙醇过程中所产生的废醪液的特性进行了概述,并对3种废醪液的处理工艺进行了分析评述。长期采用农灌法处理甘蔗废醪液易使土壤板结;DDGS及MVR蒸发浓缩技术处理玉米废醪液能够充分回收其中的营养物质,经济性好;木薯废醪液含有较高的纤维素,较少蛋白质和脂肪,适于采用厌氧-好氧工艺进行处理。燃料乙醇废醪液处理方案需根据生产原料及产品方案的变化进行调整,以实现燃料乙醇生产全过程的高效、低碳及清洁。

Waste mash produced in fuel ethanol production is a kind of high-concentration organic wastewater. There is a great potential for energy saving in the treatment of such wastewater for its large amount and its complex processing procedures. The properties of waste mash in fuel ethanol production produced by sugar cane, corn and cassava respectively were analyzed. In addition, the treatment techniques of the three kinds of waste mash were reviewed. Long-term agricultural irrigation treatment of waste mash from sugarcane would easily result in soil hardening. DDGS and MVR treatment of waste mash from corn could fully reclaim its nutrients and such treatment has high economical efficieny. Anaerobic-aerobic technology is suitable for the treatment of waste mash from cassava because it contains higher cellulose and low protein and fat. In conclusion, the selection of proper treatment of waste mash should depend on raw materials in fuel ethanol production so that high-efficiency, low-carbon and clean fuel ethanol production could be achieved.