Improved Short-Term Microbial Degradation in Circulating Water Reducing High Stagnant Atrazine Concentrations in Subsurface Sediments

Show full item record



Permalink

http://hdl.handle.net/10138/321528

Citation

Liu , X , Hui , N & Kontro , M H 2020 , ' Improved Short-Term Microbial Degradation in Circulating Water Reducing High Stagnant Atrazine Concentrations in Subsurface Sediments ' , Water , vol. 12 , no. 9 , 2507 . https://doi.org/10.3390/w12092507

Title: Improved Short-Term Microbial Degradation in Circulating Water Reducing High Stagnant Atrazine Concentrations in Subsurface Sediments
Author: Liu, Xinxin; Hui, Nan; Kontro, Merja H.
Contributor: University of Helsinki, Ecosystems and Environment Research Programme
Date: 2020-09
Language: eng
Number of pages: 17
Belongs to series: Water
ISSN: 0310-0367
URI: http://hdl.handle.net/10138/321528
Abstract: The triazine herbicide atrazine easily leaches with water through soil layers into groundwater, where it is persistent. Its behavior during short-term transport is poorly understood, and there is no in situ remediation method for it. The aim of this study was to investigate whether water circulation, or circulation combined with bioaugmentation (Pseudomonassp. ADP, or four isolates from atrazine-contaminated sediments) alone or with biostimulation (Na-citrate), could enhance atrazine dissipation in subsurface sediment-water systems. Atrazine concentrations (100 mg L-1) in the liquid phase of sediment slurries and in the circulating water of sediment columns were followed for 10 days. Atrazine was rapidly degraded to 53-64 mg L(-1)in the slurries, and further to 10-18 mg L(-1)in the circulating water, by the inherent microbes of sediments collected from 13.6 m in an atrazine-contaminated aquifer. Bioaugmentation without or with biostimulation had minor effects on atrazine degradation. The microbial number simultaneously increased in the slurries from 1.0 x 10(3)to 0.8-1.0 x 10(8)cfu mL(-1), and in the circulating water from 0.1-1.0 x 10(2)to 0.24-8.8 x 10(4)cfu mL(-1). In sediments without added atrazine, the cultivable microbial numbers remained low at 0.82-8.0 x 10(4)cfu mL(-1)in the slurries, and at 0.1-2.8 x 10(3)cfu mL(-1)in the circulating water. The cultivated microorganisms belonged to the nine generaAcinetobacter,Burkholderia,Methylobacterium,Pseudomonas,Rhodococcus,Sphingomonas,Streptomyces,VariovoraxandWilliamsia; i.e., biodiversity was low. Water flow through the sediments released adsorbed and complex-bound atrazine for microbial degradation, though the residual concentration of 10-64 mg L(-1)was high and could contaminate large groundwater volumes from a point source, e.g., during heavy rain or flooding.
Subject: Triazine
herbicide
bioaugmentation
biostimulation
Pseudomonassp
ADP
Na-citrate
groundwater
cultivation
bacteria
fungi
COMMUNITY STRUCTURE
GROUNDWATER ENVIRONMENT
BACTERIAL COMMUNITY
ORGANIC-MATTER
PSEUDOMONAS SP
BOREAL REGION
SOIL
HERBICIDE
BIODEGRADATION
DICHLOBENIL
1172 Environmental sciences
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
water_12_02507_v2.pdf 604.1Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record