Is there independent evidence that lagoon bioaugmentation works at full scale?

A small number of peer-reviewed full-scale studies are available. These include an aerated-lagoon study reporting reduced sludge depth and a 2020 study reporting improved effluent organic load after augmentation. Many other field reports are vendor case studies. Check the measurement, method and source before comparing results.

Why do reported reduction figures vary so much?

Because field results genuinely scatter. In one lagoon the same treatment returned about 75 per cent reduction in one cell and about 37 per cent in the cell beside it, and across the published record the figures run from a few inches of depth to well beyond half the blanket. The variation reflects real differences in temperature, mixing, delivery and how much of each lagoon's sludge was treatable to begin with.

Are SediLogic's published field results independent?

No. They are observations from operating plants using these formulations, not independent controlled trials. Each record is labelled as a field result and notes missing information. The library includes results outside the usual published range.

Field evidence, weighed by provenance

What the field record for lagoon bioaugmentation actually shows once each result is sorted by who produced it — the handful of peer-reviewed full-scale studies, the vendor case studies, and the wide scatter that both reveal.

The short answer

Published lagoon results include a small number of peer-reviewed full-scale studies and a larger body of vendor case studies. An aerated-lagoon study reported sludge depth falling from seven or eight feet to two or three over eight months. A 2020 municipal-lagoon study measured improved effluent organic load. Different endpoints and methods should be compared separately. Results vary widely between sites and even between adjacent cells, so a reported percentage cannot predict your lagoon's outcome.

Sort by who produced the number

Check how a field result was produced before comparing the percentage. Useful details include who took the measurements, the method, the laboratory involved and whether there was an untreated comparison. Peer review and independence are separate questions; check both rather than assuming one establishes the other.

The peer-reviewed full-scale record

Independent, full-scale, peer-reviewed studies of lagoon bioaugmentation are surprisingly few, and the most striking is also the oldest. In an eight-month study at a single municipal aerated lagoon, a multi-strain bacterial product dosed to the influent was associated with an accumulated sludge blanket falling from around seven or eight feet to two or three, with several million pounds of accumulated solids bio-converted and no reported deterioration in final effluent quality. It is a genuine full-scale result in the peer-reviewed literature — with the caveat that some of its authors appear to have been affiliated with the product, so it is not wholly disinterested, and it is nearly forty years old.

The more recent peer-reviewed work tends to measure effluent quality rather than the sludge blanket directly. A 2020 study of full-scale biogranule-augmented municipal lagoons reported a large improvement in the organic strength of the treated effluent — a reduction in five-day biochemical oxygen demand of around 86 per cent after augmentation — which is evidence that augmentation changed how the lagoons processed load, even though blanket depth was not the endpoint. Taken together, the independent record supports the mechanism at full scale while leaving the central practical question — how reliably a surface-applied product reaches and reduces a specific benthic blanket — less settled than any vendor page suggests.

The vendor case studies

Vendor case studies provide field observations but need to be read with their methods and limitations. One manufacturer reported about seven inches less sludge depth after a year. Another reported roughly 25 per cent volatile solids reduction over 180 days in a fourteen-acre lagoon, with sampling by a laboratory hired by the city. Neither report was peer-reviewed. Depth and volatile solids are different measurements and should not be treated as interchangeable.

5.0Mlb

Accumulated sludge bio-converted over 8 months at one full-scale aerated lagoon, blanket depth 7–8 ft to 2–3 ft.

Peer-reviewed

25%

Volatile solids reduction over 180 days in a vendor conference case study, sampled by a third-party laboratory.

Vendor-published

28–99%

The spread across every field result we publish for our own products, over six duties. The width of that range, not its middle, is the finding.

Field result

Our own field record

The case-study library collects results from plants using these formulations. Each is labelled as a field result, with missing measurements and other limitations noted. Results outside the usual published range are included.

Duty	Records	What the figures measure	Median	Range	Sized today
Wastewater lagoons	18	Sludge depth and solids (8 of 18)	56%	28–89%	Yes
Aeration basins	6	BOD and COD (1 of 6)	60%	60–60%	No
Collection systems	2	Fats, oils and grease (1 of 2)	70%	70–70%	No
Grease traps	5	Fats, oils and grease (3 of 5)	71%	50–91%	No
Anaerobic digesters	2	No percentage published	—	—	No
Industrial pre-treatment	11	Hydrocarbons (2 of 11)	83.9%	68–99.7%	No

Median and range cover only the records reporting the quantity named in each row, shown in brackets. Records measuring something else, or reporting no percentage, are excluded rather than averaged in.

See every published field result

Controlled research supports the underlying mechanism. Independent field evidence is more limited, and vendor field results need to be read with their methods and limitations. Our comparative and sludge-type testing is conducted in house. Keep a consistent before-and-after record for your own lagoon.

References

Hung, Y.-T., Horsfall, F. L., Wong, J. M. & Coker, D. R. (1986). Bio-conversion of accumulated sludge with bacterial augmentation process in aerated lagoons for municipal wastewater treatment. International Journal of Environmental Studies 28(1): 41–56. DOI: 10.1080/00207238608710306Peer-reviewedFull-scale aerated lagoon, single site, 8 months; sludge blanket 7–8 ft to 2–3 ft, ~5 million lb bio-converted. Some authors appear industry-affiliated; treat as peer-reviewed but not disinterested.
Pishgar, R., Lee, J., Dominic, J. A., Hosseini, S., Tay, J. H. & Chu, A. (2020). Augmentation of Biogranules for Enhanced Performance of Full-Scale Lagoon-Based Municipal Wastewater Treatment Plants. Applied Biochemistry and Biotechnology 191(1): 426–443. DOI: 10.1007/s12010-020-03256-3Peer-reviewedFull-scale lagoon augmentation; reported roughly an 86% reduction in five-day biochemical oxygen demand of the effluent after biogranule addition.
BioLynceus LLC. Solids Reduction in a Municipal Lagoon System. biolynceus.net — manufacturer case study.Vendor-publishedSelf-reported case study of a single municipal lagoon; about a seven-inch reduction in sludge depth over a year. Not independently verified.
Ahmed, B., Schici, R. & Kusek, J. (In-Pipe Technology) (2013). Lagoon Wastewater Treatment Using Innovative Bioaugmentation Technology — WEFTEC 2013 case study. Water Environment Federation (WEFTEC) conference case study.Vendor-publishedVendor-authored; about a 25% volatile-solids reduction over 180 days, with sampling by a third-party laboratory the city hired. Not peer-reviewed.

Common questions

Is there independent evidence that lagoon bioaugmentation works at full scale?: A small number of peer-reviewed full-scale studies are available. These include an aerated-lagoon study reporting reduced sludge depth and a 2020 study reporting improved effluent organic load after augmentation. Many other field reports are vendor case studies. Check the measurement, method and source before comparing results.
Why do reported reduction figures vary so much?: Because field results genuinely scatter. In one lagoon the same treatment returned about 75 per cent reduction in one cell and about 37 per cent in the cell beside it, and across the published record the figures run from a few inches of depth to well beyond half the blanket. The variation reflects real differences in temperature, mixing, delivery and how much of each lagoon's sludge was treatable to begin with.
Are SediLogic's published field results independent?: No. They are observations from operating plants using these formulations, not independent controlled trials. Each record is labelled as a field result and notes missing information. The library includes results outside the usual published range.

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