INGENIEUR
Figure 5 : Future Rasau Water Supply Scheme ( 1400 MLD ) to be commissioned in 2025 and 2028
Figure 6 : Major pollution incidents in Selangor ( 2019 ) Economic and Operational
Cost Efficiency The improved raw water quality from ORS compared to direct abstraction from rivers significantly reduces the amount of chemicals required for the treatment process , requiring lower doses of coagulants and flocculants to achieve the National Drinking Water Quality Standards set by the Malaysian Ministry of Health ( MOH ). This has led to overall cost efficiency in the water treatment process with reduction in chemical costs per cubic metre ( m ³) of treated water . However , the presence of substances such as Total Organic Carbon ( TOC ) and algae bloom may require additional treatment processes and additional chemical consumption .
Supply Resilience In 2019 , Air Selangor experienced three major incidents of WTP shutdowns due to pollution detected in Semenyih River , which is a tributary of Langat River . These pollution incidents affected the Sungai Semenyih and Bukit Tampoi WTPs ,
68 VOL 89 JANUARY-MARCH 2022