Evaluating the Development of Biocatalytic Technology for the Targeted Removal of Perchlorate from Drinking Water

Environmental Science & Technology
Justin M HutchisonJulie L Zilles

Abstract

Removing micropollutants is challenging in part because of their toxicity at low concentrations. A biocatalytic approach could harness the high affinity of enzymes for their substrates to address this challenge. The potential of biocatalysis relative to mature (nonselective ion exchange, selective ion exchange, and whole-cell biological reduction) and emerging (catalysis) perchlorate-removal technologies was evaluated through a quantitative sustainable design framework, and research objectives were prioritized to advance economic and environmental sustainability. In its current undeveloped state, the biocatalytic technology was approximately 1 order of magnitude higher in cost and environmental impact than nonselective ion exchange. Biocatalyst production was highly correlated with cost and impact. Realistic improvement scenarios targeting biocatalyst yield, biocatalyst immobilization for reuse, and elimination of an electron shuttle could reduce total costs to $0.034 m(-3) and global warming potential (GWP) to 0.051 kg CO2 eq m(-3): roughly 6.5% of cost and 7.3% of GWP of the background from drinking water treatment and competitive with the best performing technology, selective ion exchange. With less stringent perchlorate reg...Continue Reading

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Citations

Jan 10, 2018·Frontiers in Microbiology·Kellen C MobiliaJulie L Zilles
Dec 7, 2018·Environmental Science & Technology·Baotong Zhu, Na Wei

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