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Management Approach
Water is essential for business and livelihood including agricultural and industrial processes. Global climate change will increase water scarcity and making existing water resources more volatile. Realizing the importance of efficient water management, PTT declared water management as one of its business risks and established the PTT Group Water Management Team consisting of water and utilities management experts. The team is tasked to monitor, evaluate and report water situations in the eastern part of Thailand; this area includes PTT’s major production assets. The area experienced severe water shortages in 2005. The team assesses and anticipates the need for water in industrial estates during the next 10 years as part of effective water management. A risk management plan is in place to address possible draught events. These short-term and long-term operation plans are submitted to the management of companies within the group and the Risk Management & Internal Control Committee on a quarterly basis.
PTT Group’s production zone with significant water consumption is located in the Eastern part of Thailand (Chonburi and Rayong provinces). In 2012, the PTT Group Water Management Team joined the Rayong Province’s eastern water management committee. The committee consists of representatives from the public and private sector and East Water Co., Ltd. who monitor and evaluate water situations before announcing measures to reduce risks and mitigate impacts in a timely manner. Major water reservoirs in the area are closely monitored, and measures are issued to manage water before the onset of a draught to ensure long term water availability. Furthermore, the committee investigates alternative water reservoirs to increase water resources for industrial production which includes building new water reserves and setting up a desalination unit to maintain PTT Group’s production security, reducing impact from shortage of water or draught events, and avoiding possible water conflicts between industry and communities.
The PTT Group Water Management Team created a strategy under the 3Rs principles (Reduce, Reuse, and Recycle) and an effluent water management plan. The Team facilitates best practice sharing of water management within the group. The team is responsible for monitoring and encouraging water management projects in Rayong and Chonburi Provinces based on the 3Rs principles as follows:
  • Changing the water cooling system in its power plant from an open to a closed system to reduce water consumption;
  • Introducing the blow-down tank to reduce water consumed in the cooling process before releasing to wastewater treatment and using blow-down water for irrigation;
  • Implementing Reverse Osmosis Intermediated project to reuse water for cooling purpose;
  • Reusing condensate in steam production; and
  • Reusing wastewater from of the natural gas separation plant’s dehydration process at Gas Separation Plant (GSP) Unit 5 as make up water in the Acid Gas Removal Unit (AGRU) which enables the plant to reduce the volume of makeup water by 17,500 cubic meters per year.
PTT is conducting a feasibility study to manage water resources through the use of an eco-industrial system which involves reusing treated wastewater to manage water usage within the PTT Group.
Aside from managing water for companies within PTT Group, PTT set up a public private working committee and a coordination center for water management to integrate sustainable water management and development efforts. The committee consists of representatives from Royal Irrigation Department and industries located in Rayong and Chonburi Provinces which include companies within PTT Group. The committee’s major task is to effectively manage water in these two industrial provinces by considering water needs inclusive of all parties, including the industry and agricultural sectors and the communities. The committee is entrusted to identify potential water resources within and outside the area, and to assure water security in respond to constantly increasing needs of water in the area through various projects as follows:
  • Predicting water budget trend to support water management in eastern area of Thailand The PTT Group Water Management Team monitors the water situation and forecasts volume of water budget for a period of six months, 12 months and 20 years. The long-term weather forecasting technology with an integrated hydrology model provides forecasts for the main reservoirs located in Rayong.
  • Monitoring program for water scarcity mitigation measures (2016-2017)
    1. Diverting reserved water from Prasae reservoir to Rayong area
      • Prasae water pumping station 1: Prasae reservoir supplies water to Klong Yai reservoir (maximum capacity at 300,000 m3). Since January 2016, 107.73 million m3 has been diverted.
      • Prasae water pumping station 2: Prasae reservoir supplies water to Nong Pla Lai reservoir (maximum capacity at 200,000 m3). Since October 2016, 8.63 million m3 has been diverted.
    2. Diverting higher volume of water than usual from Bang Pakong river and private sources (maximum capacity at 250,000 m3), during the operating period (July to December). Total of 16.79 million m3 water has been diverted in 2016.
    3. Diverting Phra Ong Chao Chiayanuchit canal to Bang Phra reservoir (maximum capacity at 250,000 m3), during operating period (July to December). Total of 61.12 million m3 water has been diverted in 2016.
  • Infrastructure development program to ensure long-term water security and potential enhancement of eastern water resources:
    1. Construction of electrical system including Prasae water pumping station and water transmission pipeline from Prasae reservoir to Nong Pla Lai to enhance water diverting system capacity by 70 million m3 per year and to mitigate short and long term water scarcity in Rayong and Chonburi area. (project status: completed)
    2. Second water transmission pipeline from Nong Pla Lai to Nong Kho to enhance capability to supply water to designated areas (Bo Win and Pluak Daeng) by 60 million m3 per year and to prepare for increased water consumption demand in the next 20 years. (project status: completed)
    3. Second water transmission pipeline from Nong Pla Lai to Nong Kho to enhance capability to supply water to designated areas (Bo Win and Pluak Daeng) by 60 million m3 per year and to prepare for increased water consumption demand in the next 20 years. (project status: completed)
    4. Construction of Nong Waen Watergate, to halt sea water at Prasae estuary and mitigate flood disaster in Klaeng district as well as being a water resource for Map Ta Phut area with 70 million m3. (project status: completed)