Environmental Engineering
Disinfection efficiency is

Increased at higher pH value of water
Unaffected by pH value of water
Highest at pH value equal to 7
Reduced at higher pH value of water

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Environmental Engineering
Sludge volume index is defined as the ratio of

Percentage of sludge by volume to percentage of suspended solids by weight
Percentage of suspended solids by weight to percentage of sludge by volume
Percentage of total solids by weight to percentage of sludge by volume
Percentage of sludge by volume to percentage of total solids by weight

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Environmental Engineering
The polluted water is one which

Is contaminated
Is safe and suitable for drinking and domestic use
Contains pathogenic bacteria
Consists of undesirable substances rendering it unfit for drinking and domestic use

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