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Transport and fate of bacteria in SAT system recharged with recycling water
LIAN Jingjing 1,LUO Zejiao 2 *,JIN Menggui 2
1.Key Laboratory of Biogeology and Environment Geology, Ministry of Education (BGEG), School of Environmental Studies, China University of Geosciences
2.Key Laboratory of Biogeology and Environment Geology, Ministry of Education (BGEG), School of Environmental Studies, China University of Geosciences, Wuhan, Hubei, 430074, P.R.China
*Correspondence author
#Submitted by
Subject:
Funding: The National Major Basic Research Program of China（No.973:#G2010CB428802）, The Research Fund for the Doctoral Program of Higher Education of China （No.No. 20100145110010）, The National High Technology Research and Development Program of China（No.No.2007AA06Z337）
Opened online:21 April 2011
Accepted by: none
Citation: LIAN Jingjing,LUO Zejiao,JIN Menggui.Transport and fate of bacteria in SAT system recharged with recycling water[OL]. [21 April 2011] http://en.paper.edu.cn/en_releasepaper/content/4421889
 
 
Groundwater recharge with recycling water through soil aquifer treatment (SAT) system was applied in a lot of countries. In the process of recharging, the SAT system plays an important role in degrading organic pollutants, removing bacteria, N, P and so on. Even if the pathogen can be removed effectively, however, it doesn't mean that there is no possibility for the pathogen going through aerated zone and contaminating groundwater. This paper presents an experiment on the transport and fate of the bacteria (E.coli) in SAT system, a packed silt soil column, under saturated conditions. The simulated solution considered the basic control index and maximum limit value of groundwater recharge with urban recycling water. The concentration of bacteria was 105-CFU/L in the secondary discharge standard of wastewater treatment plant effluent. The experiment included two recharging stages (firstly for 12 days and secondly for 22 days) with 11 days drying between them The results showed that there was no detection of E.coli, and the electric conductivity, total nitrogen, IMn became the same finally between the influent and effluent. The concentration of E.coli in the solid phase decreased from up to down. Because of the growth and metabolism of bacteria, the soil column was blocked, which was resolved through drying. This simulation of recycling water recharge in lab could make people understand the transport and fate of contaminants better, and provided reference to practical projects.
Keywords:E.coli; recycling water; soil aquifer treatment (SAT) system
 
 
 

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