Emergency biological intervention at a food-industry treatment plant
After chemical inhibition knocked out the biological treatment, sludge escaped into the clarification pond. With emergency biological reinforcement and a bioreactor, the ammonium level fell from 15–17 mg/L to 0.8 mg/L in three weeks — and further to 0.2 mg/L at follow-up.
The bioreactor in place in the clarification pond, about a week after intervention
The intervention ran over three weeks in May–June 2026. Here are the measurable changes in the clarification pond.
From 15–17 mg/L to 0.8 mg/L in three weeks, and then down to 0.2 mg/L at follow-up.
Reduction in ammonium from the starting point to the latest measurement.
Emergency boosting of the pond began the day after call-out.
The sludge in the clarification pond was stabilised after the intervention.
At a food-industry treatment plant, chemical inhibition occurred, a state in which a substance disrupts or kills the bacteria that drive the biological treatment. When the microbiology was knocked out, the plant lost its treatment capacity, and organic sludge escaped into the clarification pond, known as sludge escape.
The result was sharply elevated ammonium levels and a visibly loaded clarification pond with floating sludge. In the weeks before the intervention, the ammonium level was 15–17 mg/L. The situation called for an emergency intervention to restore the biological balance before the load spread further through the system.
The intervention began the day after call-out. The clarification pond was immediately boosted with specialised bacterial cultures (Bio-S1 and Bio-S2) to quickly restart the biological breakdown, while the treatment plan was prepared and the equipment was transported, assembled and installed on site.
Eight days after call-out, a bioreactor was put into operation. It was boosted and maintained continuously with Bio-S1, Bio-S2 and Bio-S3. The bioreactor provided a stable environment with high biological activity and strengthened the breakdown of organic material and the turnover of nitrogen in the water.
The effect of the intervention showed quickly in the measurements. By day 1, the ammonium level had fallen from 15–17 mg/L to 12 mg/L. As the biological processes were re-established, the level kept falling, to 2.4 mg/L after one week and 1.4 mg/L after two weeks.
After three weeks, ammonium was measured at 0.8 mg/L in the clarification pond. The result was achieved even though the inflow from the process tanks still added over 3 mg/L, showing that the system was actively breaking down nitrogen rather than merely diluting the level. At a later follow-up, the level had fallen further to 0.2 mg/L.
| Time | Ammonium mg/L | Process status | Trend |
|---|---|---|---|
| Weeks before | 15–17 mg/L | Chemical inhibition · sludge escape | Starting point |
| Day 1 | 12 mg/L | Emergency boost (Bio-S1 / Bio-S2) | Fast response |
| Day 7 | 2.4 mg/L | Bioreactor in operation | Marked decrease |
| Day 14 | 1.4 mg/L | Continued stabilisation | Continued decrease |
| Day 21 | 0.8 mg/L | Stable biological treatment | Stable level |
| Follow-up | 0.2 mg/L | Continued stable treatment | Lowest measured |
This case shows how acute chemical inhibition, one of the most critical operational disruptions for a biological treatment plant, can be reversed quickly with targeted biological reinforcement. By quickly restarting the microbiology and supporting the process with a bioreactor, treatment capacity was restored without taking the plant out of operation.
The same principle applies to municipal wastewater plants, where toxic shocks, overload and inhibition can knock out the biological treatment and lead to discharge above limit values. A prepared biological contingency, with the right microbial cultures and equipment, can substantially shorten the time from disruption to stable treatment.
The first three weeks gave 0.8 mg/L, and a later follow-up showed 0.2 mg/L. Measurements continue to confirm long-term stability.
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