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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UPS | INVERTER | CHARGER | SMPS

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UPS

ONLINE 

  • Static switch is used
  • Operates in 0 ms or micro second
  • Charging and discharging of batteries is done simultaneously
  • Some standard ratings are 30 kVA / 40 kVA / 75 kVA / 125 kVA 


OFFLINE

  • Transfer switch is used
  • Operates in between 4 ms to 10 ms
  • Charging and discharging of batteries is not done simultaneously

    • INVERTER

    • It performs both operation i.e., Rectification & Invertion 
    • Some standard ratings are 2 kVA, 3.5 kVA, & 5 kVA
    •  Terminals are Input (P), Output (P) & Common (N&G)

    CHARGER

    • It performs only Rectification
    • Available only in online mode    



    SMPS

    • It performs only Rectification
    • available only in online mode


    key points:

    UPS module redundancy 
    UPS system redundancy



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