Reconstruction and Extension Project of Wastewater Treatment Plant in Beijiang Area, Tianjin Port

Abstract

The original East Pier wastewater treatment plant in Beijiang Area, Tianjin Port, was built in 1992 to treat the wastewater produced locally. As required by the environmental protection department and owners, the output quality after treatment should meet the first class-A standard in “Pollutant discharge standard for urban sewage treatment plant (GB/T18918-2002)”. Furthermore, water quality should meet the standards on city greening, road cleaning and fire water in “Urban sewage regeneration and utilization-water quality for multiple uses in city (GB/T18920-2002)” So the plant should be reconstructed and extended. Based on the analysis on the quantity of wastewater in Beijiang Area, the proper treatment processes were adopted. After this reconstruction and extension project, this waste water treatment plant can treat sewage about 1.4 million tons per year. Currently, annual quantity of water used for city greening and road cleaning in Beijiang Area, Tianjin Port is about 5,000,000 tons each year, which will be substituted by the water treated from this waste water treatment plant, so that this project helps to greatly save water and bring an excellent economic performance. 1 Project description The original East Pier wastewater treatment plant in Beijiang Area, Tianjin Port, was built in 1992 to treat the wastewater produced locally, including both domestic and industrial wastewater. The system used oxidation ditch technology as the major biochemical treatment method, and was designed with a capacity of 2000m/d. This reconstruction and extension project of the original East Pier wastewater treatment plant plans to treat all the wastewater in Beijing Area, Tianjin Port, with a newly capacity of 4000m/d. Based on the test results of wastewater samples collected from sewage pipe network and the entrance of East Pier waste water treatment plant, the quality of water input to this new project has been estimated (see Table 1). As required by the environmental protection department and owners, the output quality after treatment should meet the first class-A standard in “Pollutant discharge standard for urban sewage treatment plant (GB/T189182002)” [1]. Furthermore, water quality should meet the standards on city greening, road cleaning and fire water in “Urban sewage regeneration and utilization --water quality for multiple uses in city (GB/T18920-2002)” [2]. Table 1. Quality of water input to the new waste water treatment plant Chemical oxygen demand