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What do solids in waste water cause?
Silting of rivers
What are examples of toxic substances in waste water?
NH3 / heavy metals
What is BOD used to predict?
Effect of discharging waste / determine effectiveness of purification
By law, BOD must not exceed_______?
20mgL^-1
What equation is occurring at anaerobic digesters?
Organic matter -> CH4 + CO2 + H2O
What is the equipment for anaerobic digesters?
Incubation in sealed stirred tanks reactor at 35 degrees
What are the 2 secondary treatments?
Percolating filtration treatment / activated sludge process
What is formed on surface of clinker?
Biofilm of microbes
Tertiary processing:
Consist of filter through sand or pumping into enclosed reed bed prior to release into rivers.
Percolating filtration treatment / activated sludge process - which ones faster?
activated sludge process