STP & ETP

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  STP     Sewage treatment platn (residential & commercial) ETP     Effluent treatment plant (industry) COD     Chemical oxygen demand (soluble & insoluble organic compound) (2hr to 3hr) (mg/l) BOD     Biochemical oxygen demand (organic compound) (3days to 5days) (mg/l) KEY POINTS: Outlet of STP 50mg/l Biproduct of anaerobic digestion is H2S & NH3 To reduce stink smell use ozone 
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SENSORS

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RTD                  Resistance temperature detector
NTC                  Negative temperature coefficient
PTC                   Positive temperature coefficient
PT100                Platinum resistance thermometer 100 (resistance at 0'C)
PT1000              Platinum resistance thermometer 1000 (resistance at 0'C)
2 wire RTD        less accuracy than 4 wire RTD
4 wire RTD       more accuracy than 2 wire RTD



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