Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10395575 | Bioresource Technology | 2010 | 9 Pages |
Abstract
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 41Â 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 13,217Â mg/kg and a mean total phosphorus level of 1133Â mg/kg. Moreover, it can also be utilized as a biofuel to give a mean calorific value of 6690Â Cal/g which is equivalent to that of coal.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
H. Chan,