Proceedings of Industrial Safety and Environmental Protection Seminar of 2004, Southern Taiwan Science Park.
Due to the rapid increase in population, rapid industrial development, and improvement of living standards, Taiwan currently faces an increasing demand for water resources. In order to solve the issues of water shortages, wastewater recycling is one of the pressing issues at hand. Through the water quality comparison between effluent processed by the three-level treatment of biological treatment by contact aeration, chemical coagulation and sedimentation, and filtration of wastewater from a certain high-tech industrial park in southern Taiwan and the water used for sprinkling, irrigation, flushing, industrial usage (cooling water, cleaning water, pure water, and boiler), drinking, and groundwater, this study explores the feasibility of recycling wastewater from industrial park wastewater treatment plants and reusing the water for secondary livelihood purposes and industrial production processes in the hopes of reducing the water costs of manufacturers and to ensure economic benefits.
The assessment results show that, 1) the BOD5 in the treated water does not conform to the water quality standards required for sprinkling, irrigation, and toilet uses stipulated by the Water Resources Agency, MOEA. The Escherichia coli, lead, cadmium, and manganese levels do not conform to the water quality standards required for water used in soil treatment such as plant irrigation and dust inhibition stipulated in the soil treatment provisions in the Water Pollution Control Act.; 2) The SS, electrical conductivity, and total iron conform to the water quality standards required for cooling water and washing tower. The temperature and electrical conductivity does not meet the requirements for pure water; The pH value and phosphate level do not match the water quality requirements for boiler water.; 3) The TDS, Escherichia coli, Pb, Cd, Fe, Mn, F–, Cl–, and SO42- do not meet the standards for drinking water and water source, and the COD does not comply with the standards for drinking water and water source.; 4) The TDS, Pb, and Mn levels do not meet the monitoring standards for Type 2 groundwater but conform to the restriction standards for Type 2 groundwater.
In conclusion of the preliminary assessment, although some of the water quality indicators of the treated water do not conform to the water quality standards required for sprinkling, irrigation, toilet water, industrial water (cooling, washing, pure water, and boiler water), drinking water source, the use of advanced wastewater treatment such as chlorination and disinfection, microfiltration, ion exchange resin and activated carbon adsorption together with the current water treatment technology will enable us to achieve the objectives of water recycling and reuse.