Water quality requirments
- Created by: Luke Mitchell
- Created on: 13-01-13 15:04
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- Water Quality Requirements. 1
- Turbidity
- suspended solids must be removed becuase they give water an unpleasant appearance and taste and settling of suspended solids would block pipes
- Concentration expressed as TSS (total suspended slids)
- pH
- If water is too acidic it can dissolve copper pipes.
- If pH too high/low can make water taste unpleasant
- Ideal range = pH 6.5-8.5)
- Calcium
- Dissolved calcium ions make water 'harder'.
- Hard water is good for health as it can reduce tooth decay/heart disease
- But can react with soap and produce solid limescale if water is heated
- Pesticide concentration
- All pesticides are toxic, but not to humans.
- water should be treated to remove all pesticides
- Heavy metal concentrations
- Heavy metals e.g. lead/mercury can damage nervous sytem, but low concentrations cause no damage
- Dissolved O2
- low dissolved O2 levels can make water smell musty or of hydrogen sulfide.
- Some toxic metals are more soluble in water with a low dissolved oxygen content.
- Turbidity
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