In situ remediation of atrazine contaminated groundwater

Show simple item record

dc.contributor.advisor Cartmell, Elise
dc.contributor.advisor Godley, Andrew R.
dc.contributor.author Pearson, Robert
dc.date.accessioned 2007-02-16T11:30:19Z
dc.date.available 2007-02-16T11:30:19Z
dc.date.issued 2006-09
dc.identifier.uri http://hdl.handle.net/1826/1430
dc.description.abstract The natural attenuation of groundwater pesticides by biological degradation, is widely accepted to occur at concentrations > 1 mg 1-1. However from observations of groundwater monitoring data it can be indicated that the occurrence of pesticides in groundwater is primarily at trace μg 1-1 concentrations, with 45 % of UK groundwater samples that failed the EC Drinking Water Directives PV of 0.1 μg 1-1 between 1995 – 2000, accounting for an average concentration of 64 μg 1-1. However, there are limited directed studies of in situ biological degradation of pesticides at μg concentrations. Therefore, this work was designed provided an insight as to whether any prevalent microbial adaptation can occur to degrade atrazine at μg 1-1 concentrations in groundwater. Laboratory batch studies were performed using a groundwater exposed to 0.2 μg 1-1 of the herbicide atrazine, for an excess of 10 years. Bacterial enrichment using a glucose minimal salts medium resulted in no biological degradation of atrazine, when amended at concentrations between 10 μg to 50 mg 1-1. Batch studies using the atrazine degrader Pseudomonas sp. Strain ADP as a positive control, indicated a capability to degrade atrazine within sterilised groundwater, at 50 mg 1-1 (0.92 mg 1-1 day-1) and 1 mg 1-1 (0.14 mg 1-1 day-1), but no degradation of atrazine at 100 or 10 μg 1-1. Therefore, biological degradation of trace μg 1-1 concentrations of atrazine by groundwater in situ bacteria does not readily occur. It is expected that changes in atrazine groundwater concentrations, are resulting purely from dilution, sorption or chemical degradation. Consequently, it cannot be assumed that microbial adaptation can occur to degrade atrazine at μg 1-1 concentrations in groundwaters even if in situ bioaugmentation methods are applied. en
dc.format.extent 4458797 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Cranfield University en
dc.rights © Cranfield University, 2006. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder. en
dc.title In situ remediation of atrazine contaminated groundwater en
dc.type Thesis or dissertation en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD en


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search CERES


Browse

My Account

Statistics