n Civil Engineering = Siviele Ingenieurswese - Upgrading of the Dordrecht Wastewater treatment works : projects : technical excellence category




As a result of the bucket eradication project in Dordrecht, the amount of sewage emanating from the town has increased in recent years, with more waterborne sewage being planned in the near future. This necessitated the upgrading of the current wastewater treatment works (WWTW) from its current 1 M/d capacity to a future 2.8 M/d capacity. This project consisted of the initial upgrades to the WWTW comprising a new inlet works, a new chlorination building with a chlorine contact tank, as well as a treated sewage effluent storage pond to cater for future irrigation purposes. The upgraded Dordrecht WWTW combines a conventional pond system with new technologies, including chlorine disinfection. The condition of the existing ponds was also improved with some necessary maintenance work, increasing the life expectancy of the current ponds. Dordrecht currently uses four sewage pump stations to pump sewage to the head of the WWTW. These pump stations frequently overflow due to pump failure and Eskom load-shedding. The construction of sewage overflow ponds was not permitted as part of this project, due to the local environmentally-sensitive areas (wetlands). Back-up generators were, however, permitted to prevent pump stations overflowing during load-shedding.


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