The effect of water pre-treatment with poly-aluminium chloride on the decomposition of dissolved organic matter in managed aquifer recharge

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Niinikoski-Fusswinkel , P , Purkamo , L & Karhu , J 2020 , ' The effect of water pre-treatment with poly-aluminium chloride on the decomposition of dissolved organic matter in managed aquifer recharge ' , Bulletin of the Geological Society of Finland , vol. 92 , pp. 99-110 . https://doi.org/10.17741/bgsf/92.2.002

Title: The effect of water pre-treatment with poly-aluminium chloride on the decomposition of dissolved organic matter in managed aquifer recharge
Author: Niinikoski-Fusswinkel, Paula; Purkamo, Lotta; Karhu, Juha
Other contributor: University of Helsinki, Department of Food and Nutrition
University of Helsinki, Department of Geosciences and Geography

Date: 2020
Language: eng
Number of pages: 12
Belongs to series: Bulletin of the Geological Society of Finland
ISSN: 0367-5211
DOI: https://doi.org/10.17741/bgsf/92.2.002
URI: http://hdl.handle.net/10138/326790
Abstract: This study examines the effect of poly-aluminium chloride (PACl) pre-treatment on the biological purification process taking place during managed aquifer recharge (MAR). PACl treatment is used in waste and surface water treatment to remove organic material. PACl can decrease the organic carbon contents of water significantly. However, aluminium is toxic to microbes, which may be detrimental when the PACl treatment is followed by infiltration into an aquifer (MAR). In this study the effect of pre-treatment with PACl on the water purification process in MAR was examined, by using sediment from a MAR site in four test columns. Two columns were filled with PACl-treated water, and the remaining ones with river water without PACl. The residence time of water in the columns was raised from direct sampling gradually to 64 days. Among the parameters monitored were the pH of the water, microbial activity and the decomposition of dissolved organic carbon (DOC). The results showed active decomposition in all columns. Decomposition of organic matter, and the amount of living/active microbial cells, was marginally higher in the untreated water, which could imply a better functioning MAR system. However, this may also be due to higher DOC starting concentration.
Subject: PACl
DOC
carbon isotopes
water purification
managed aquifer recharge
isotope hydrology
REMOVAL
GROUNDWATER
CARBON
COAGULATION
RHIZOBIA
FLUORIDE
ACIDITY
SIZE
PH
1171 Geosciences
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