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KEYWORD: Decentralized wastewater treatment; Programmable logic controller (PLC); Automatic control ABSTRACT: Decentralized wastewater increasingly serious, remote control of small scale waste- water treatment station operation has become urgent technology problems. This paper mainly intro- duces the component and function of automation system used in decentralized wastewater treatment and how to use PLC to achieve automation control. The control automation, resource optimization, management and control integration were archived. background Recently, with the urbanization of the rural area and the economic development of township industrial enterprises, more and more industries water was used. The rising living standard in rural area leading the more water resource consumption, more wastewater and more frequently water pol- lution, which turn point source pollution to non-point source pollution and centralized pollution to decentralized pollution. In rural area, because of the low level economic development, huge amount of local population and decentralized residence, rural water pollution need to be solved. Therefore, how to keep a good operation of wastewater treatment equipment with the poor management of rural area and poor level of wastewater treatment has direct influence on wastewater treatment effect. In today's wastewater treatment industry, PLC is mostly used in site control. SCADA system monitor mode was used to show and set process parameters by computer to improve the automated level of wastewater treat- ment (1) . This paper aimed to the challenge of maintenance of the decentralized wastewater treat- ment site and designed automatic control system based on PLC+MCGS software to realize unattended, remote control and automatic alarmed.

Solution of Automatic Control System Based on PLC in Decentralized Wastewater Treatment