eThekwini Water and Sanitation is a unit of the eThekwini municipality and provides water and sanitation to all customers in Durban, KwaZulu-Natal. The unit is continuously looking for ways to improve its services.
Initiatives such as flow limiters, polypropylene water piping, ground tanks and semi-pressure water-service levels, urine-diversion toilets and anaerobic baffled reactors were first introduced in South Africa by eThekwini.
The unit has been involved in the Industrial Energy Efficiency (IEE) Project through several initiatives, including a pump-systems optimisation assessment (conducted at the McCausland pump station) and energy assessments at three of its depots (Springfield, Ottawa and Pinetown) in Durban.
Since there are 27 plants across the province, it was decided to select a pilot plant that best represented the different types of treatment works. Umbilo Wastewater Treatment Works (WWTW) was chosen as the demonstration facility for the implementation of an EnMS.
An EnMS consultant was appointed to guide the development of the EnMS, after which an energy team was appointed. The energy team, with the help of the EnMS consultant, conducted an energy review to identify opportunities to improve energy performance..
In 2014 and 2015 an EnMS was implemented at a total capital investment of less than R1 000. This resulted in a total monetary saving of R280 000 and an energy saving of 287 620kWh per annum, more than 10% of the total site energy . GHG emissions were reduced by 275 tonnes of CO2. The total payback period for the investment was less than 1 month.