Compliance troubleshooting
Ammonia, BOD, TSS and odor problems in a permitted lagoon system, worked from the symptom back to the cause.
Short answer
Most lagoon permit violations trace back to two root causes: short-circuiting and sludge accumulation. Ammonia, TSS and odor are usually symptoms rather than separate problems. A defensible investigation starts with current organic loading, what cell one is actually removing, and a profile of the sludge blanket.
Start from the symptom
| What you are seeing | Where it usually comes from | Start here |
|---|---|---|
| Ammonia over limit | Nitrification capacity, cell-one BOD removal, or water temperature | Read the guide |
| Rotten-egg odor | Anaerobic conditions, usually the sludge blanket or an overloaded cell | Read the guide |
| Unexplained TSS spikes | Solids resuspending from a blanket near the effluent structure | Read the guide |
| BOD violations | Organic overload, inadequate oxygen, or short-circuiting | Read the guide |
| Winter exceedances only | Nitrification shutting down in near-freezing water | Read the guide |
The guides
Compliance
Wastewater Lagoon Ammonia Removal: Why Lagoons Fail Ammonia Limits
Why lagoons fail ammonia limits, how nitrification actually works in a treatment cell, and the fix ladder from operational changes to capital upgrades.
ComplianceLagoon Odor Control: Finding the Source Before Buying the Fix
Hydrogen sulfide odor from a wastewater lagoon is a dissolved oxygen diagnostic. How to find the source, the fix ladder, and managing neighbor complaints.
The sequence that holds up
- Get current loading. Pounds of BOD5 per day and per acre per day, against what the cells were designed for. An overload is a pretreatment problem, not an equipment problem.
- Measure cell one. The primary cell should remove on the order of 80 percent of influent BOD5. When it does not, every downstream cell inherits work it was not designed for.
- Profile the sludge. Volume, distribution and composition, and specifically whether it is concentrated at the effluent end. The method is in sludge judging.
- Profile dissolved oxygen. By depth and location, pre-dawn as well as midday. A cell can read fine at the aerator and be anoxic thirty yards away.
- Read the seasonal pattern. Exceedances that track water temperature point at nitrification capacity, not equipment failure.