Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
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The hourly variation factor is usually taken as
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Disinfection of water results in
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If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
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Laying of sewers is usually done with the help of
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The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
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As compared to shallow wells, deep wells have
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As compared to cast iron pipes, steel pipes are
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In water treatment, rapid gravity filters are adopted to remove
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In facultative stabilization pond, the sewage is treated by
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The gas from sludge digestion tank is mainly composed of
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The maximum efficiency of BOD removal is achieved in
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The minimum and maximum diameters of sewers shall preferably be
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The biochemical treatment of sewage effluents is essentially a process of
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Sewerage system is usually designed for
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Sewage treatment units are normally designed for
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Generally the detention period for grit chambers is kept as
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Activated carbon is used for
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The polluted water is one which
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In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be
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