Nutrient removal from human fecal sludge digestate in full-scale biological filters.

Chemosphere · 2020 · PMC7397500 · PMID 32512331

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a decreasing trendno p-value reported

In fact, the COD concentration had a decreasing trend from day 35 onward.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.