In accordance with different leading industries, various industrial parks produce different kinds of wastewater, including various industries such as the chemical industry, mechanic manufacturing, electronics, processing, pharmacy, pesticides and leather. Discharge of pollutants from industrial park must satisfy the national, provincial and municipal standards. Treatment of the "three wastes" should focus on centralized treatment. In principle, it is required that the wastewater should be conducted with centralized treatment first, then enters the wastewater pipe network of the industrial park, and advanced process should be adopted to reduce discharge of pollutants.

Water Quality Characteristics
In accordance with different industries and products, various industrial parks have huge difference in pollution agents, which mainly includes organics such as COD, BOD5 and NH3-N, and certain organics are difficult to degrade and have bad biochemical quality.

Thought for Treatment
Process design should be conducted in accordance with the industrial characteristics and water quality of wastewater from the industrial park. After pretreatment, various enterprises discharge the wastewater into the central wastewater treatment plant, and an incident emergency treatment system should be established in accordance with the possible standard-exceeding situation of wastewater. In addition, in accordance with the big shock load and bad biochemical quality of the wastewater, the treatment process which can better stand the shock load than traditional process should be selected.

Typical Treatment Process
The generally adopted main process is pretreatment + incident emergency treatment system + physicochemical treatment + biochemical treatment + advanced treatment system. The main water treatment structure in the wastewater treatment plants mainly consists of thick grille, wastewater lift-pump station, thin grille, rotational flow grit chamber, buffering and homogenization basin, biochemical basin, secondary sedimentation tank, contact disinfection tank, mud storage tank, sludge dehydration chamber and electric transformer and distribution chamber.