Organophosphorus compounds biodegradation by novel bacterial isolates and their potential application in bioremediation of contaminated water

SANTILLÁN, J. Y.; ROJAS, N. L.; GHIRINGHELLI, P. D; NOBILE M.; LEWKOWICZ, E.; IRIBARREN, A.

BIORESOURCE TECHNOLOGY

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2020

0960-8524

Organophosphorus compounds (OPs), the major pesticides used worldwide,comprise an environmental hazard due to their harmful toxicity. Aimed todevelop a bioreactor to remediate OPs contaminated wastewater, bacteriaisolated from contaminated soils were identified and their ability to degrade OPsassessed, resulting in two main isolates, Sphingomonas sp. andBrevundimonas sp. Their OP degrading activities were characterized in terms oftemperature, pH and substrates acceptance, resulting in high degradation ratesat 60 °C, pH 10 and towards bulky OPs such as coroxon, coumaphos, andchlorpyrifos. Sphingomonas sp. cells were immobilized and 75.4 % degradationof 0.15 mM chlorpyrifos was achieved after 21 days by immobilized cells inbatch system, while this OP was completely degraded within 17 hours when thebiocatalyst is settled in a packed bed bioreactor, with a reusability of 8 cycles.These results suggest the potential application of this system in thebioremediation of contaminated wastewater.