Operator checklists for STP, ETP and RO

Daily

Inlet screen and grit cleared; flow reading noted; blower running and DO checked in the aeration tank; MBBR media moving or SBR cycle completing; clarifier surface clear; treated water colour and odour; chlorine dose and residual; sludge level.

Weekly

Sludge drained or dewatered; screens and diffusers inspected; pump and blower oil, belts and vibration; chemical stock; flow meter and level switches tested.

Monthly

Lab test of inlet and outlet BOD, COD, TSS and pH; panel and earthing check; valve exercise; record and review trends.

Daily

Equalisation tank level and mixing; inlet pH; chemical dosing rates and tank levels; flocculation and clarifier condition; biological tank DO and appearance; outlet pH, colour and TSS; sludge handling; log all readings.

Weekly

Dosing pump calibration; jar test if inlet has changed; sludge dewatering performance; instrument cleaning; housekeeping and leaks.

Monthly

Outlet COD, BOD and TDS tests against your consent; review chemical consumption per KLD; maintenance plan update.

Daily

Feed, interstage and reject pressures; feed, permeate and reject flows; permeate conductivity; antiscalant and chemical dosing; cartridge filter pressure drop; record the values every shift.

Watch for

Normalised permeate flow falling or pressure drop rising. Membrane suppliers usually advise cleaning when normalised flow drops about 10 to 15% or pressure drop rises about 15%. Confirm the trigger in your membrane supplier guidance and plant O&M manual.

Monthly

Feed water analysis, SDI, chlorine check before the membranes, CIP record, instrument calibration.

Download the checklists (PDF)

These are typical checks, not a substitute for the O&M manual of your plant. Want checklists written for your own plant? Send an enquiry, and see our O&M contracts.