Hardness And What Impact Does It Have On Water Quality

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1. What is hardness and what impact does it have on water quality?
Hardness is the amount of dissolved calcium and magnesium in the water. Hardness impacts on water quality throughout the aesthetic acceptability by consumers (meaning the concentration of the calcium and magnesium and other dissolved solids are measureable by the consumers). In addition to, economic and operational considerations (which is controllable throughout the treatment or blending in public drinking water), hard water tends to leave scale deposition in the water distribution system, as well as in heated water applications. (Hardness in Drinking-water, 2011).

2. What water quality standards are associated with water hardness?
There is no Primary or Secondary standard for water hardness by EPA. Also hardness has no health risk. As the hardness of water is classified: 0 to 60 mg/ as calcium carbonate is classified as soft; 61 to 120 mg/L as moderately hard; 121 to 180 mg/L as hard; and more than 180 mg/L as very hard. (Water-quality criteria. (n.d.).

3. Briefly describe your understanding about pH and why is pH important in water treatment. Give two examples. pH is a measure of the hydrogen ion activity in the water and is determined by the relative number of the hydrogen ions for acidity and hydroxide ion for alkalinity, thus mathematically expressed as pH=-log [H+] where [H+] is the hydrogen ion activity . pH values are calculated in powers of 10.Thus, the hydrogen ion concentration of a solution
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