Pin floc: fine, slow-settling particles washing over the weir. The scattered surface floc in your photo lines up with over-oxidized sludge — SRT is likely running long and F/M low, so floc shears into pin-sized pieces.
CONFIDENCE: HIGHVERIFY AT THE BENCH
Recommendation
DO THIS FIRST~15 min
Increase wasting to bring SRT down toward target. Trim aeration to hold DO ≈ 1.5–2.0 mg/L. Recheck SVI & effluent turbidity in 3 days.
Lower SRTDO 1.5-2.0 mg/L
Read: Riverside WWTP · last 14 days · 23 lab entries
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Logbook14Lab23
Up to date37 entries · 30 days
Today · Sun 12 Jul3 entries · 3 lab
21:48M. WebbLab
BOD5, Final Effluent
18mg/LWithin limit
Final Effluent
21:42M. WebbLab
SVI, Aeration Basin 1
142mL/gWithin range
Aeration Basin 1
21:39M. WebbLab
MLSS, Aeration Basin 1
2,840mg/LWithin range
Aeration Basin 1
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ValueDO · mg/L
0.05.2mg/L
0target 1.5–5.0 mg/L10
Within range
ParameterChoose…DOmg/L
LocationChoose…Aeration Basin 1
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123456789
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HASH-CHAINED · RIVERSIDE WWTP
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Logbook14Lab23
Up to date37 entries · 30 days
Today · Sun 12 Jul3 entries · 3 lab
07:05M. Webb
Completed morning rounds
21:48M. WebbLab
BOD5, Final Effluent
18mg/LWithin limit
Final Effluent
21:42M. WebbLab
SVI, Aeration Basin 1
142mL/gWithin range
Aeration Basin 1
21:39M. WebbLab
MLSS, Aeration Basin 1
2,840mg/LWithin range
Aeration Basin 1
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21 parameters read normal this week. Nothing due today.
0 PM items due today · 0 work orders open
DO, Aeration Basin 15.2 mg/L
MLSS, Aeration Basin 12,840 mg/L
SVI, Aeration Basin 1142 mL/g
Recent entriesLogbook →
SAT 20:28Completed rounds. Aeration basins gave s…
FRI 09:00Digester Temperature — Anaerobic Digest…
FRI 08:50RAS Suspended Solids — RAS: 8,271 mg/L
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Recommendations
Open · 3
Diagnostic· high confidence
Three days since increasing wasting due to the pin floc. Recheck SVI and effluent turbidity.
Monitor· overnight
Watch DO in Aeration Basin 1 overnight — trended 1.4 mg/L at 21:00.
Task· due Fri
Pull a slide if SVI holds above 150 through Friday.
Resolved · 2
Confirmed RAS rate after the rain event
BOD5 holding time flagged by the Process Expert — resampled
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Sludge isn't settling. SVI just spiked to 168.
Filamentous bulking, likely. Your last 3 SVIs trend up and DO ran low Tuesday. Pull a slide and loop in the Microscope.
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Stalked ciliates · EpistylisFilaments · open floc
Dominant stalked ciliates (Epistylis) attached to the floc, so good BOD removal and a healthy SRT.
But filaments are bridging open floc in spots. That is an early settling risk, not full bulking yet.
Run an SVI and a settling test now, hold DO above 2.0 mg/L, and hold off on big wasting changes.
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Last 30 days
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Jul 12
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Influent pump 2 keeps tripping on overload. Where do I start?
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