Semicontinuous activated sludge test

Biological treatment simulations consist of either continuous (CAS) or semicontinuous (SCAS) activated sludge tests that use either synthetic or natural sewage. The sewage or initial sewage inoculum usually is taken from a domestic wastewater treatment plant in order to reduce variability (industrial wastewater plants may contain very special chemical loadings) and to simulate treatment of consumer products. If treatability information in an industrial wastewater plant is desired, samples from the plant may be used. 

Biodegradation 65% primary biodegradation in 14 weeks test duration for river die-away studies when exposed to the natural microbial population of the water ty, = 28 8 d for primary biodegradation rate from semicontinuous activated sludge studies (Saeger et al. 1979). 

Figure 6.16 Weight loss (w/) of Mater-Bi AI05H (A class) under Semicontinuous Activated Sludge (SCAS) test conditions [118] as a function of time t).

A number of commercial PCB formulations have been tested for their degradability by microbes in aerobic activated sludge in a semicontinuous operation. Similar to animal metabolic results, mono-, di-, and trichloro-biphenyls are significantly biodegraded and volatilized, whereas PCBs with... 

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