2014 journal article

Perchlorate natural attenuation in a riparian zone

JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, 49(10), 1100ā€“1109.

By: R. Borden n, S. Knox, M. Lieberman & D. Ogles*

author keywords: Perchlorate; littoral zone; natural attenuation; qPCR
MeSH headings : Bacteria / metabolism; Biodegradation, Environmental; Environmental Monitoring; Groundwater / analysis; Groundwater / microbiology; Perchlorates / analysis; Perchlorates / metabolism; Water Movements; Water Pollutants, Chemical / analysis; Water Pollutants, Chemical / metabolism
TL;DR: Perchlorate concentrations in the source area are expected to meet cleanup criteria in 11 to 27 years without active remedial measures, and there was a rapid perchlorate attenuation in organic rich littoral zone, and qPCR results show large increases in per chlorate degraders in the littoran zone. (via Semantic Scholar)
UN Sustainable Development Goal Categories
14. Life Below Water (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

Multiple lines of evidence were used to document the natural attenuation of perchlorate in a shallow alluvial aquifer. In the upgradient, aerobic portion of the aquifer, perchlorate did not biodegrade. However, natural flushing by groundwater flow is reducing perchlorate concentrations in the aquifer over time. Perchlorate concentrations in the source area are expected to meet cleanup criteria in 11 to 27 years without active remedial measures. At the distal end of the plume, perchlorate is rapidly degraded as it migrates upward through organic rich littoral zone sediments. Apparent first-order degradation rates in groundwater were about 0.20 dāˆ’1 and are consistent with laboratory macrocosm rates (0.12 dāˆ’1). qPCR results show a distinct region of the littoral zone where perchlorate degraders are elevated. The Eh within this zone varies from +0.1 to +0.3 V indicating perchlorate degraders can thrive in moderately oxidizing conditions. The study has shown that (i) there was no apparent perchlorate biodegradation in aerobic aquifer; (ii) perchlorate declines over time in aerobic aquifer due to flushing; (iii) there was a rapid perchlorate attenuation in organic rich littoral zone; and, (iv) qPCR results show large increases in perchlorate degraders in the littoral zone.