McWong Environmental and Energy Group is closely involved in projects that are required to prepare for the Shanghai Expo 2010. As part of the construction for the Expo,Baosteel Group Shanghai Pudong Iron & Steel Co., Ltd. will be relocated to the Luojing area, where it will be rebuilt into a modern steel complex with advanced metallurgical processes and a total annual capacity of 1.57 million tons/year of new steel.

The MEEG designed Pugang Wastewater treatment plant is built to treat the wastewater produced from multiple steel making process lines. The wastewater produced from different process lines is first pretreated before entering into the main wastewater treatment plant. Once entering the main wastewater treatment plant, the system prepares the wastewater to meet the reuse water standards and the Shanghai discharge standardI. Most of the treated wastewater from this system is currently being reused while the excess effluent water is discharged to the ShiDongKou sewage treatment plant. Reusing the wastewater at this system has been a great success for the Pugang Iron and Steel Co.

Design specifics for this system are shown below:The design flow rate for the wastewater treatment plant is 14000m³/d.

First, the influent wastewater flows through a screen and then into the main equalization basins. There is a submersible mixer in the equalization basins to prevent settlement of suspended solids. Second, a lift pump is used to pumps the wastewater into a Micro-Vortex Flocculation Reactor (MVFR). Coagulants and polymers are added at the influent pipe of MVFR, the effluent water from MVFR then flows via gravity into a V-shaped sand filter, and where the effluent from the sand filter flows into clean water tank and is ready for reuse or discharge.