SULFUR DENITRIFICATION EQUIPMENT OF SEWAGE AND WASTEWATER USING IMPROVED ACTIVATED SLUDGE PROCESS

摘要

PURPOSE: A sulfur denitrification equipment of sewage and wastewater using an improved activated sludge process, is provided, which can treat sewage by feeding limestone in upstream without any foreign carbon source such as methanol and acetic acid to replenish alkalinity keeping stabilized treatment efficiency. The system can also utilize the existing facilities, save chemical cost and save operation and maintenance costs. CONSTITUTION: The system comprises the followings: (i) the system that has a primary settling tank (2), an activated sludge aerobic tank (3), a secondary settling tank (4) and a sulfur denitrification filtering tank (9); (ii) a primary settling tank (2); (iii) an activated sludge aerobic tank (3) that is divided by baffles into three parts of a pretreament tank (10) and nitrification tanks (11,11'); (iv) a secondary settling tank (4), at the down stream of which a lime feeding device (13) is set; and (v) a sulfur denitrification filtering tank (9).