Chu W, Ng F L
Department of Civil & Structural Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Environ Int. 2000 Aug;26(1-2):17-22. doi: 10.1016/s0160-4120(00)00073-8.
Grease traps are widely used by most restaurants and food processing industries in Hong Kong to reduce oil and grease to an acceptable level before it can be discharged to public sewers. To meet demanding effluent standards in the future, it is necessary to polish the effluent by upgrading the conventional trap design. This study evaluated the possibility of upgrading traditional grease traps by installing tube settlers inside the trap. Their efficiency of removing chemical oxygen demand (COD) and oil/grease was examined to justify the performance. It was found that installing a tube settler is a feasible and cheap way to upgrade the conventional grease trap, since it improved oil/grease removal efficiency by 8-10% compared to the conventional design. In addition, a remarkable improvement in COD removal was observed following a very short hydraulic detention time after the installation of tube settlers. This ensured acceptable effluent quality under peak flowrates. Two mathematical models were also proposed to facilitate trap design.
香港的大多数餐厅和食品加工业广泛使用隔油池，以便在废水排放到公共下水道之前将油和油脂降低到可接受的水平。为了满足未来严格的污水排放标准，有必要通过升级传统隔油池设计来对污水进行净化处理。本研究评估了通过在隔油池内安装斜管沉淀器来升级传统隔油池的可能性。研究了它们去除化学需氧量（COD）和油/油脂的效率，以证明其性能。结果发现，安装斜管沉淀器是升级传统隔油池的一种可行且廉价的方法，因为与传统设计相比，它将油/油脂去除效率提高了8-10%。此外，在安装斜管沉淀器后，在非常短的水力停留时间后，化学需氧量的去除有了显著改善。这确保了在峰值流量下污水质量可接受。还提出了两个数学模型，以方便隔油池设计。
