When the Operator's Memory Is the Only Record, You've Already Lost
Three months of unreported bypass activations. A compressor belt that nobody tensioned because the last guy assumed the previous shift did it. Sludge blanket climbing past the weir because concentration readings lived in someone's head instead of a log. Every WWTP operator has inherited a plant where the maintenance history was a stack of water-damaged paper forms in a filing cabinet that smells like hydrogen sulfide.
The real damage isn't one missed check. It's the pattern you can't see because the data was never captured in a queryable format. When ARPA shows up for a compliance audit and asks for six months of redox readings, "we wrote it down somewhere" is not an answer that keeps your discharge permit active.
Two Visits, One Shift Record — and Why That Matters
This Memento setup mirrors the actual rhythm of a vagliatura inspection cycle: two site visits per shift, each with its own entry time, exit time, operator assignment, and visit motive. That's not bureaucratic overhead — it's the difference between an ordinary check and a return trip triggered by a TLC alarm at 2 AM.
The "Motivo visita" field captures four distinct conditions: routine, regulatory body presence, completion of suspended activities, and alarm-triggered callouts. When you filter records by motive over a quarter, you start seeing whether a specific plant code generates disproportionate alarm visits. That's the kind of signal that justifies a capital expenditure request for new level sensors before the next budget cycle.
Operator pairing matters too. The template tracks Operatore 1 and Operatore 2 for each visit independently. Cross-referencing operator combinations against inspection quality ratings reveals whether certain teams consistently miss the canalette cleaning or skip the Imhoff cone measurement.
The Screening Section Nobody Configures Right
Most operators treat the sgrigliatura ratings as a formality — check all fives, move on. That's exactly how you end up with a bar screen jammed solid during a storm event, raw influent bypassing into the settler, and your SVI numbers going sideways for a week.
The template forces granularity: intasamento e sgrigliatura gets its own 1-5 rating, separate from visual machine inspection, separate from big-bag fill level. The big-bag field uses a six-point scale — vuoto, 1/4, 1/2, 3/4, pieno — because "almost full" is not a useful data point when you're scheduling bag replacements around a holiday weekend.
There's a boolean for bag substitution. Either you changed it or you didn't. No ambiguity, no "I think someone swapped it Tuesday."
Dissolved Oxygen, Redox, and the Numbers That Actually Run Your Plant
The oxidation-nitrification section captures three values that matter more than everything else combined: dissolved oxygen concentration, redox potential (mV), and sludge concentration from the Imhoff cone.
These are free-text fields, not ratings. That's intentional. A DO reading of 2.1 mg/L means something very different from 0.8 mg/L, and a five-star rating scale can't capture that. The redox field (1001101) takes raw millivolt readings — the kind of number you're jotting down with wet gloves while standing next to an aeration basin at 6:45 AM when the January fog hasn't lifted and you can barely read the probe display.
Sludge concentration at the Imhoff cone (1001107) and recirculation sludge concentration (1001115) give you the before-and-after picture of your biological process. When concentration in the settler starts creeping up while recirculation stays flat, your return sludge pump is losing capacity or your airlifts are partially blocked.
Compressor Maintenance on a Seven-Day Cycle
The 7 GG fields — belt tensioning, pressure relief valve check, oil level — enforce a weekly discipline that falls apart without digital tracking. A compressor running with slack belts for ten days doesn't fail immediately. It runs hot, the filtro aspirazione clogs faster, aeration efficiency drops by fifteen percent, and your energy bill climbs before anyone notices the belt was the root cause.
Rating fields for vibration, noise, and functionality on the compressor motor section (1000160) aren't cosmetic. A score of 3 that drops to 2 over three consecutive visits is a bearing failure in progress. The settler section follows the same logic: raschia di fondo functionality, foam presence, surnatante coverage classified from absent to thick total coverage — each field designed to catch a degradation trend before it becomes an emergency extraction of excess sludge at 11 PM on a Friday.