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LOCAL WATER QUALITY ISSUES THAT IMPACT CHLORINE TREATMENT --- Groundwater Contamination Water contaminated with organic matter, such as pesticides, heavy metals, or volatile organic compounds (VOCs), can interfere with chlorine treatment. Chlorine reacts with organic compounds to form byproducts, such as trihalomethanes (THMs), which are known carcinogens. For example, 0.1 milligrams per liter (mg/L) of bromide can lead to the formation of up to 0.1 mg/L of bromate, a known byproduct of chlorine disinfection.
Hardness and pH Levels
Chlorine treatment can be affected by water hardness and pH levels. High levels of alkalinity, such as those found in groundwater with a pH above 8.0, can neutralize chlorine. Conversely, low pH levels, such as those found in acidic groundwater, can accelerate chlorine decomposition. To address this issue, water treatment plants may need to add acidic or alkaline chemicals to adjust the pH levels before chlorine disinfection.
Presence of Iron and Manganese
Iron and manganese can interfere with chlorine treatment by forming insoluble compounds. When these metals react with chlorine, they can form iron and manganese oxides that can coat the surface of treatment equipment, reducing their effectiveness. To mitigate this issue, water treatment plants may use pre-treatment processes, such as aeration or filtration, to remove iron and manganese before chlorine disinfection.
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