Established in 1992, East Rand Water Care Company (ERWAT) provides bulk wastewater conveyance and treatment to thousands of industries and more than 3.5 million people. It currently operates 19 wastewater treatment works that release between 700 to 1,000 megalitres of wastewater, both domestic and industrial, per day.
Knight Piésold was appointed by ERWAT to conduct aquatic bio-monitoring at 19 wastewater care works (WCW) on a quarterly basis. The aim of the bio-monitoring is to assess the impact of the WCW on the receiving aquatic environment. To comply with the Water Use Licence conditions from the Department of Water and Sanitation, aquatic bio-monitoring and toxicity testing need to be conducted downstream and upstream of each WCW.
The project entailed the following aquatic monitoring services: