The restaurant wastewater refers to the organic wastewater with edible discarded oil in high concentration after the process of solid-liquid separation. The main part is food waste, which including leftover of food processing and food residue that come from family, school and foodservice industry. The components of restaurant wastewater are oil, water, rind, vegetables, grain, meat and bones, also the waste dishware, plastic and napkins are mixed together with it. The kitchen leftover is abundant in sugar. But the food residue contains protein, starch, animal fat with high percentage of salt and oil.
Restaurant Wastewater Treatment Process Description
The owner of this restaurant wastewater treatment project requests the effluent water’s quality can reach the standard of Limits of Water Pollutant Discharge (DB44/26-2001). The wastewater flows into the coagulation tank. After the process of coagulation and sedimentation, the DAF system separates suspended oil by gravity. The supernatant continuously enter the membrane-bioreactor, which consists of hydrolytic acidification, contact oxidation and MBR membrane. Finally the standard outlet water is produced. The sludge will be condensed in plate and frame filter press through the sludge tank, and the supernatant refluxes into water regulating tank. The sludge can be outward transported as plant substrate.