Grease-trap waste (GTW) and sewage-scum grease (SSG) are under-utilized, high-lipid waste streams that have the potential to be converted into biodiesel. This paper presents a longitudinal study of GTW and SSG samples that were obtained over a 1 year period; GTW was sampled from a storage tank at a grease-collection company, and SSG was sampled from scum-concentration buildings at three wastewater resource recovery facilities. Samples were fractionated to quantify their lipids, secondary wastewater, and solids content. Results show that the average lipid content of SSG was seasonally dependent; lipid content was 15–40% in cooler months and 3–21% in warmer months. Alternatively, GTW showed an average overall lipid content of 4% in raw GTW; however, the floating layer from settled GTW had an average lipid content of 34%. These greases could serve as feedstocks for urban low-carbon biodiesel production while reducing the volume of biosolid waste disposal.

中文翻译：

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废水润滑脂的纵向研究及其在生物燃料生产中的潜力

捕集油脂的废物（GTW）和污垢油脂（SSG）是利用率低下的高脂废物流，有可能转化为生物柴油。本文介绍了在1年内获得的GTW和SSG样品的纵向研究。GTW是从一家油脂收集公司的储油罐中取样的，而SSG是从三个废水资源回收设施的浮渣浓度建筑物中取样的。分离样品以定量其脂质，二级废水和固体含量。结果表明，SSG的平均脂质含量与季节有关；凉爽月份的血脂含量为15–40％，温暖月份为3–21％。另外，GTW在原始GTW中的平均总脂质含量为4％。但是，沉降的GTW的浮层的平均脂质含量为34％。