Developing a Decentralized Wastewater Treatment System using Modular Plasma at Atmospheric Pressure

Abstract

The water pollution from the local restaurants and hotels in many tourist cities is currently being warned. The disadvantages of using centralized wastewater plants are expensive, environmental impact, and high energy consumption. Moreover, a large-scale plant in rural areas risks on a long pipe, high bump capacity and high initial capital investment. Furthermore, the conventional treatment methods have low treatment efficiency, and unstable and high maintenance and operation cost because of using combined physical-chemical, and microbiological systems. In this study, a decentralized wastewater system using modular plasma at atmospheric pressure integrated with a distributed control system was developed to solve the real problem in the big cities. The wastewater's properties of a tourist city, Sam Son, are determined to evaluate the upstream wastewater. A decentralized treatment system, 10m3 /day, was installed in a hotel to evaluate the treatment efficiency. The results showed that the untreated wastewater was seriously polluted including inorganic and organic; the properties are higher than 1.8 to 8.8 times compared to the permitting standard. And the quality of treated water was reduced to 70-90% and reached QCVN 14:2008 in column A. An alert platform for monitoring the location, capacity, and quality of treated water was modeled. In conclusion, the system is high efficiency, low cost, and environmentally friendly.