In order to meet the needs of the control-unit-based water pollution prevention problem in China, we proposed a comprehensive control unit zoning method with the combined basic administrative region and objective watershed management. The method can effectively connect the natural characteristics of watershed water sources, three-level zoning of water resources, and comprehensively consider the...

In 2004,ammonia concentration in raw water of Sitalakhya River at the eastern periphery of Dhaka was found higher than the expected rate of 4 mg/Lforecasted in feasibility studies,with a value of about 8 mg/L, which could not be removed by conventional treatment chain employed at Dhaka, hence, recentlyan ammonia removal plant has been constructed. This important background has ledto the current...

A description is given of settling chambers with sprays, cyclone types and electrostatic precipitators as used in municipal incinerators. Special emphasis is placed on selection and duct design especially to inlets of collectors which affects efficiency. Importance is stressed on preventing leaks and overfilling of hoppers and proper maintenance of equipment in order to obtain optimum efficienc...