Marine Resources Technologies, 65 Fisherman's New Village, Tap Mun, N.T., Hong Kong, China.
Bioresour Technol. 2010 Sep;101(17):6859-67. doi: 10.1016/j.biortech.2010.03.104. Epub 2010 Apr 10.
Most restaurant operators in Hong Kong run their business in commercial buildings. Many of them fail to meet oil and grease (O & G) limits. The O & G and Chemical Oxygen Demand (COD) content of the effluents can be reduced to meet government prescribed standards using a combination of compressed air and chemical treatment in existing two-chamber grease traps. A mean level of 41 mg/L and a mean removal of 92.7% of O & G can be achieved for a typical fast food restaurant. COD reduction can further be improved by dissolved air flotation enhanced with chemicals. Sludge generated from flotation treatment of the wastewaters can be recycled as a fertilizer to give a mean total nitrogen content of 13,217 mg/kg and a mean total phosphorus level of 1133 mg/kg. Moreover, it can also be utilized as a biofuel to give a mean calorific value of 6690 Cal/g which is equivalent to that of coal.
香港大部分食肆经营者都在商住楼宇经营，不少都未能符合油及油脂（O & G）的排放限制。透过在现有的双格隔油池加入压缩空气及化学处理，可以将食肆污水的含油量及化学需氧量（COD）降低至符合法例规定的标准。对于一般的快餐店而言，平均含油量可降至 41 毫克/升，去除率达 92.7%。透过加入化学物的气浮法，可进一步提升 COD 的去除率。经气浮处理后的剩余淤泥可用作肥料，其总氮含量平均为 13217 毫克/公斤，总磷含量平均为 1133 毫克/公斤。此外，淤泥也可作生物燃料使用，平均热值为 6690 卡路里/克，与煤炭相若。
