Optimizing the use of precipitation chemical in drinking water treatment

Abstract

The presence of iron and manganese in groundwater causes significant challenges to water treatment facilities worldwide, including those in Mikkeli City, Finland. This study optimized groundwater coagulation for Mikkeli’s waterwork. It was initially planned using poly aluminium chloride (PAC) but conducted using aluminium chloride hydrate (ACH) to optimize treatment processes. This study investigates the efficacy of aluminium chloride hydrate (ACH) chemicals in enhancing the removal of iron and manganese from groundwater sources. The research methodology involved conducting laboratory-scale experiments to assess the effectiveness of ACH chemicals in treating groundwater samples collected from various locations in Hanhikangas water intake. The coagulation process was carefully monitored and optimized to achieve maximum removal efficiency for both iron and manganese contaminants. The experimental results revealed that ACH chemicals enhanced iron removal by up to 73% but were ineffective for manganese. However, after Dyna-sand filtration, manganese removal reached 100%, demonstrating the importance of combining treatment methods for comprehensive contaminant removal. Insight into these mechanisms provides valuable knowledge for optimizing treatment protocols and designing efficient water treatment systems tailored to the specific needs of Mikkeli City and similar regions facing similar challenges. In conclusion, this thesis demonstrates the feasibility and effectiveness of utilizing ACH chemicals for enhancing the removal of iron and manganese from groundwater in Mikkeli City. The findings contribute to advancing the understanding of water treatment technologies and provide practical insights for addressing water quality issues associated with iron and manganese contamination. Implementing such treatment strategies holds promise for ensuring access to safe and clean drinking water for residents of Mikkeli City