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At a Boston municipal oil water separator serving 29 automotive repair garages, continuous Petroleum Treat dosing cut effluent total petroleum hydrocarbons (TPH) from 22,940 to 79 mg/L, a 99.7% reduction, in 120 days, bringing the separator under the 100 mg/L city discharge limit and dropping annual pumping cost from $16,000 to $1,200.
| Metric | Before | After (day 120) |
|---|---|---|
| Effluent TPH | 22,940 mg/L | 79 mg/L (99.7% lower) |
| City discharge limit (100 mg/L) | Exceeded | Met and maintained |
| TPH at day 45 | 22,940 mg/L | 614 mg/L |
| Annual pumping and disposal cost | $16,000 | $1,200 |
| Pumping frequency | Repeated pump-outs | Sharply reduced |
Day 0: effluent from 29 auto repair garages overwhelmed the 200-gallon oil water separator, with TPH at 22,940 mg/L, more than 200 times the 100 mg/L city discharge limit.
Day 120: after continuous Petroleum Treat dosing, effluent TPH reached 79 mg/L, a 99.7% drop that cleared the discharge limit, while annual pumping cost fell from $16,000 to $1,200.
Continuous-feed petroleum degrading bacteria digest total petroleum hydrocarbons directly inside the separator. In this municipal case, dosing Petroleum Treat through a metering pump cut effluent TPH from 22,940 mg/L to 79 mg/L, a 99.7% reduction, and held it below the 100 mg/L city discharge limit.
When the incoming hydrocarbon load is heavier than the unit can settle out, oil and grease carry through into the effluent and TPH climbs past permit limits. Here, waste from 29 automotive repair garages overwhelmed a 200-gallon separator, pushing TPH to more than 200 times the 100 mg/L city limit and forcing constant pump-outs.
Yes. A high-CFU blend of petroleum degrading bacteria, fed continuously, built an active population inside the separator that broke down aliphatics, aromatics, and petroleum distillates in place. Effluent TPH dropped 99.7% over 120 days while the separator stayed in normal service.
Digesting hydrocarbons in place means far fewer pump-outs. In this project, annual pumping and disposal cost fell from about $16,000 to $1,200, a savings of roughly $14,800 a year, with no new tanks or added separator capacity.
Results build as the bacterial population stabilizes. Effluent TPH here reached 614 mg/L within 45 days and 79 mg/L by day 120, moving the separator from more than 200 times its limit to fully compliant.
Petroleum Treat (PT) Liquid is metered into the separator continuously with a dosing pump, keeping a steady supply of bacteria in contact with the incoming hydrocarbon load. It also comes in powder, block, and tablet formats for different systems and dosing setups.
Municipal stormwater operations, automotive service centers, fleet and truck yards, car washes, and industrial sites running API or CPI separators use petroleum degrading bacteria to keep effluent within discharge limits and reduce how often the separator has to be pumped.
It works when the biology is dosed to match the load. In this municipal case, effluent TPH went from 22,940 mg/L to 79 mg/L and stayed under the 100 mg/L city discharge limit, resolving a compliance problem that physical separation alone could not fix.
This is the product behind these results. Open its page for full specifications, packaging, and dosing rates.
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