Treatment Process Operations and Equipment Rounds

Treatment Process Operations and Equipment Rounds

One of the most important daily duties of a water or wastewater operator is completing equipment rounds. A round is a structured walk-through of the facility during which you observe, measure, and record the condition of every major process unit and piece of equipment. Accurate rounds keep the treatment process within permit limits, catch problems before they become failures, and create the legal operating record that regulators may inspect at any time.

Why Rounds Matter

State operating permits require facilities to maintain continuous, verifiable records of process performance. The operating log is a legal document. Entries must be legible, recorded at the time of observation (not reconstructed later), and signed or initialed by the operator making the round. Falsifying or backdating log entries is a serious violation that can result in loss of your license. Accuracy is not optional.

What You Read and Record

During a typical round you will observe and document readings from:

• Flow meters – influent and effluent flow rates, usually in million gallons per day (MGD) or gallons per minute (gpm)
• Pressure gauges – pump discharge and suction pressures; filter influent and effluent pressures
• Level indicators – wet-well levels, clearwell levels, chemical tank levels
• Turbidimeters – measure turbidity in nephelometric turbidity units (NTU); critical for filter performance and regulatory compliance
• Dissolved oxygen (DO) meters – essential in activated-sludge wastewater plants; low DO signals a process imbalance
• Chemical feed pumps – stroke rate, stroke length, or pump speed settings; confirm chemical is actually being delivered by checking tank levels against the previous round

Always compare each reading to the acceptable range printed on the rounds sheet or posted at the panel. Any reading outside that range is an out-of-range value and must be flagged to your supervising licensed operator immediately. Do not wait until you finish the round. Document the time you notified the supervisor and the corrective action directed.

Process Control Adjustments

You will assist your supervisor with process control adjustments. You may not make independent changes unless you hold a valid operator license and the facility authorizes it. Common adjustments include:

• Chemical dose changes – increasing or decreasing chlorine feed, coagulant feed, or pH-adjustment chemical based on influent water quality or effluent results
• Filter backwash initiation – triggered by headloss across the filter reaching a set threshold or by turbidity breakthrough; follow the facility's backwash sequence step by step
• Aeration rate adjustment – increasing blower output when DO in an aeration basin falls below the target setpoint; decreasing output to save energy when DO is above target

For every adjustment, record in your field journal: the date and time, the parameter that prompted the change, the before value, the adjustment made (what control was changed and by how much), and the after value observed once conditions stabilized. This before-and-after record is the foundation of good process control.

Preventive Maintenance Tasks

Operators are responsible for keeping equipment running. Preventive maintenance (PM) tasks are scheduled before failures occur. During your externship you will participate in tasks such as:

• Lubrication – applying the correct grease or oil to bearings and gear boxes per the manufacturer's O&M manual; over-greasing can damage seals
• Belt tension checks – a belt that is too loose slips and wears; too tight overloads bearings; follow the manufacturer's specification
• Pump seal inspection – mechanical seals should show only a slight weep (often specified as a few drops per minute); a steady stream means the seal is failing

Complete a maintenance work order form for every PM task. Include the equipment ID, date, task performed, findings, any parts used, and the next scheduled service date. Discuss findings with your supervisor during the weekly debrief.

Safety First

Before any maintenance task, apply lockout/tagout (LOTO) procedures (OSHA 29 CFR 1910.147) to isolate and de-energize equipment so it cannot start unexpectedly. Verify the equipment is de-energized before touching moving parts.

Wear the correct PPE for the hazard:

• Chemical splash — safety goggles, face shield, chemical-resistant gloves, and apron when working near chlorine, coagulants, or acids
• Noise — hearing protection in blower rooms or pump rooms that exceed 85 dB
• Slip hazards — slip-resistant boots on wet floors around filters and clarifiers
• Confined spaces — never enter a vault, wet well, or digester without a confined-space entry permit and atmospheric testing for oxygen deficiency, flammable gases, and toxic gases

Report all near-misses and injuries to your supervisor immediately.

The Field Journal

Your field journal is your professional record and will be reviewed weekly. Write entries at the time events occur. Use clear, plain language: state the observation, the value, the action, and the result. Avoid vague phrases like "seemed okay" — write the actual number. A complete, legible journal demonstrates the habits that licensed operators must maintain throughout their careers.