Study of Grease Interceptors in Mashhad City and Presenting an Appropriate and Efficient Design

In this study, strengths and weaknesses of installed or under installation grease interceptors in Mashhad city were identified. A new grease removal system was then designed and built to resolve these weaknesses. The system was an 800 L cylinder
(1 m diameter and 1 m height) from galvanized metal coated with two layers of composite at both sides. A cubic basket (20 × 20 × 20 cm) was installed at the system inlet to prevent entering trashes into the system. Removability of the basket and two baffles installed on the system facilitates discharge and cleaning process. A grease remover bridge of 50 cm length equipped with a gearbox motor (12 V, 3 rpm), discharges accumulated grease automatically in adjustable time periods. The system was designed based on retention of 30 min. This system offers several advantages including low volume and weight, easy and quick installation, safety and low costs. The oil concentration in the outlet stream is below 100 ppm which meets the standards for discharge to the sewage network.