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Ben-Gurion University of the Negev (2019)

Formation of disinfection by-products during artificial aquifer recharge with chlorinated desalinated seawater

Studny, Raz

Titre : Formation of disinfection by-products during artificial aquifer recharge with chlorinated desalinated seawater

Auteur : Studny, Raz

Etablissement de soutenance : Ben-Gurion University of the Negev

Grade : Master of Science (MS) 2019

Résumé
In recent years, Israel’s dependence on natural water sources has decreased, along with the increased production capacity of desalinated seawater. Desalinated water contains residual concentrations of free chlorine and bromide which react with naturally occurring organic matter and may lead to formation of disinfection by-produces. Aquifer recharge with chlorinated desalinated seawater is temporarily practiced to a small extent as a storage solution during maintenance of the water carrier system. The objective of this research was to study the factors that control THMs formation and fate under the unique case in which chlorinated desalinated seawater is infiltrated into the sandy sediments of the Israeli coastal aquifer. Field results show little formation of THMs during infiltration into the unsaturated zone, with concentrations reaching a maximum of 9.3±0.9 μg/L, regardless of chlorine or bromide concentrations in the water that reached 0.4 and 2.0 mg/L, respectively. Recovered groundwater from wells located downstream of the recharge site exhibited extremely low concentrations of THMs (<2.7 µg/L). Concentrations are far below public health regulations of drinking water in Israel, which dictate a MCL of 100 µg/L. Laboratory work suggests that soil might be the factor controlling THMs formation. The presence of high amounts of soil particles (soil/water ratio >625 g/L) has resulted in inhibition of THMs formation, reaching concentrations of 5 - 63 µg/L in different experiments, yet the soil had little effect on pre-existing THMs

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Page publiée le 8 janvier 2022