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Industrial firms that kill and process chickens generate wastewater that contains fat, oil, and grease (FOG). The FOGs are located in the fatty waste that is collected by floatation in grease traps. Chemical and physical characterisation of FOGs would provide useful information that would help in the development of methods designed to decrease the extent of pollution caused by disposal of the waste and to utilise commercially some of its lipid constituents. Employing these methods would enhance the profitability and competitive potential of these commercial organisations. Samples of grease trap waste from 14 firms in central Thailand have been examined. Due to the very different schemes of waste management employed by these firms, the physical appearance of their fatty wastes showed considerable variation. The chemical and physical properties of the FOGs present in these wastes showed considerable variation also. Large amounts of free fatty acids (10–70% as oleic acid) were detected in most of the 14 wastes and palmitic, cis-9-oleic, cis,cis-9,12-linoleic, stearic, and palmitoleic acids were the predominant species of free and esterified acids. Most of the FOGs were solid at temperatures below 40 °C. Many of them contained traces of heavy metals (Cu and Pb) and some contained traces of the pesticides dimethoate and cypermethrin. The content of these potentially hazardous substances would have to be considered very carefully before discarding the fatty wastes and during the development of methods designed to isolate their potentially profitable lipid constituents. 相似文献
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上海市餐厨垃圾处理管理思路剖析 总被引:1,自引:0,他引:1
根据<上海市餐厨垃圾处理管理办法>,分析了加强餐厨垃圾处理管理的思路,包括对物流、资金流和信息流的控制,从而实现餐厨垃圾产生环节、收集运输环节、处置环节的有效监管,维护公共卫生安全. 相似文献
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清洁生产制工艺的研究 总被引:3,自引:0,他引:3
研究了在无水环境下,利用低级醇与甘油酯的酯交换反应,生成脂肪酸酯和甘油,然后将脂肪酸酯化的二步法制工艺。在实验室条件下,利用本工艺研制成黄白色肥皂粉末,产率为98%;甘油的回收率为8%(重量比);醇的一次循环蒸出率为85%,本工艺将反应过程缩短为1~2h,大大节省了能源,符合绿色设计的要求。 相似文献
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