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controls motorised pinch valve on the Balancing Tank outflow. The tanks are fitted with an emergency release, which discharges via storm flow bypass pipeline to the emergency settling tank. The contents of the emergency settling tank can be re turned to the head of works or can overflow to the maturation dam, downstream of the main treatment plant. 4.2.4 Secondary Treatment Activated Sludge Process Settled wastewater from each modules balancing ta nk flows to an activated sludge bioreactor which consists of two parallel streams; reactors 1&2 fo Module 1 and reactors 3 & 4 for Module 2. The configuration for Module 1 was modified to be simila to Module 2 during the construction of Module 1. schematic layout of the Module 1 bioreactor is shown in Figure. 4-3 Figure 4-2: Zeekoegat WWTP Bioreactor Module Layout (Adapted from Golder & Associates, Each reactor consists of fourteen cells. The first ei ght cells are unaerated and mixed. Cells 9 and 1 can either be aerated or unaerated (swing cells). The last four cells are always aerated. The aeration system is discussed in more detail in Section 4.2.5. In order to allow maximum operational flexibility and be able to meet low and limits the bioreactors were designed to be operated in any of five process configurations 3-stage Phoredox (A2O) Johannesburg Modified Johannesburg UCT (VIP) Modified UCT The process configurations are chan ged by manipulating where the influent, return activated sludge (RAS) as well as the internal mixed liquor recycl es are discharged. In 2 when this study was conducted, the bioreactors were operat ed as 3-stage Phoredox process. Each Module bioreactor lane has two SSTs. Mixed liquor from each bioreactor is split equally between these two SSTs for final clarification. The underflow (RAS) from pair of SSTs is pumped back to Cell 1 (or Cell depending on the process configuration of Module reactor. Thus, the