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  • HOME > Case Studies > Industrial Automation > THUA THIEN HUE CONSTRUCTION AND WATER SUPPLY STASE ONE MEMBER CO., LTD

    THUA THIEN HUE CONSTRUCTION AND WATER SUPPLY STASE ONE MEMBER CO., LTD

    Constructing a System to Automatically Dose the Proper Amount of Chemicals at the Proper Time

    The Vietnam-Yokohama Safety Water Supply Management Project has been providing support in four technical areas: chemical dosing control using a supervisory control and data acquisition (SCADA) system, flexible pipe method, water leakage monitoring detection utilizing L-sign devices, and rehabilitation of filtering sand. With regard to these four areas, Azbil Corporation’s role was to provide technical assistance for the use of the monitoring and control system for water purification plants. Specifically, Azbil provided support for the installation of the above system to automate the chemical dosing process at HueWACO’s Quang Te 2 water treatment plant (WTP) in order to dose the needed amount of chemicals to control the quality of water supplied. In addition, Azbil provides HueWACO with technical support for the operation of this system.

    At the water treatment plant, chemicals such as PAC, polymers, KMnO4, and chlorine are dosed at various stages of the water treatment process.

    Luu Ngoc Tuan, Vice Manager of Planning in the Technical Department of HueWACO explains, “The SCADA system at Quang Te 2 WTP, which was installed in 2009, just performed semiautomatic chemical dosing and the determination of chemical dosing amount was still done manually. As a result, sometimes the amount of chemicals injected did not meet the requirements, which in turn increased our production costs or affected the water quality.”

    In the project, Azbil’s Harmonas-DEOTM monitoring and control system was used as the central equipment of the new automatic chemical dosing control system. The system receives data from the existing monitoring system through a gateway, calculates the amounts of chemicals to add, and controls the chemical dosing process so that the appropriate amounts of chemicals are automatically added at the appropriate times.

    To prepare for the construction of the system, three HueWACO engineers were dispatched to Japan and received system-related training at Azbil’s Fujisawa Technology Center. After learning the basic technology of the automation and control system, the three engineers and Azbil Corporation began developing the control program to be installed in Vietnam.

    In the central monitoring room, Harmonas-DEO monitors the flow rate of water entering the water receiving well and the degree of water turbidity, and controls the rotation speed of chemical dosing pumps and the opening and closing of control valves.

    In the central monitoring room, Harmonas-DEO monitors the flow rate of water entering the water receiving well and the degree of water turbidity, and controls the rotation speed of chemical dosing pumps and the opening and closing of control valves.

    Harmonas-DEO calculates the amounts of chemicals to add and sends instructions to the chemical dosing pumps and control valves.

    Harmonas-DEO calculates the amounts of chemicals to add and sends instructions to the chemical dosing pumps and control valves.

    * Harmonas-DEO is a trademark of Azbil Corporation.

    This case study was published in the 2016 Vol.4 issue of the azbil Group's corporate magazine, azbil.

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