Analysis of the impact of the industrial fat, oil and grease (FOG) on a municipal wastewater treatment plant by means Respirometry and microscopic Bioindication

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Courtesy of SURCIS, S.L.

The main impact that the industrial fat, oil and grease (FOG) could make in a municipal wastewater treatment plant is mainly coming from its slowly biodegradable COD (sbCOD) The wastewater entering in a municipal WWTP tends to include a percentage of slowly biodegradable COD in the range of 35 to 65% of the total COD; but when this percentage surpasses the habitual range, normally it is due to the presence of any industrial waste that can adversely affect the process and which is usually called recalcitrant COD. Just in the case of a high slowly biodegradable COD coming from FOG wastes, the process become into a specific bulking and foaming phenomena accompanied by specific filamentous bacteria, a deteriorated sludge under the state of dispersed flocculation and certain degree of bioactivity reduction. Often those effects are erroneously classified as toxicity, when in fact chances are it is not. BM Respirometry and microscopic Bioindication stand as an effective combination to analyze this situation accurately and figure out some conclusions that could afford to take the corrective actions that can reduce the harmful effects coming from this situation.

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