Treatment Efficiency Study of Nizwa New Sewage Treatment Plant

Abstract

Water is life. There is a huge gap between supply and demand of safe drinking water due to population explosion. There is a need to recycle and reuse waste water to meet the growing demand for water. In some developed countries like Malaysia, waste water is being converted in to drinking water. Nizwa new sewage treatment plant has a modified activated sludge process to improve treatment efficiency. The sewage after removing suspended solids enters aeration tank. High capacity surface aerators are supplying oxygen to activate the sludge. In secondary treatment coagulation is by-passed. Aeration tank outlet enters clarifier. The clarifier outlet water is passed through membranes. The waste water from membrane filter is recycled back in to process. Sewage treatment plant BOD and COD removal efficiency is 99%, Nitrate-nitrogen is 80% and TDS efficiency is 50%. The treatment efficiency of Nizwa new STP is rated as excellent.