List the events that reduce the biological oxygen demand (Bod) of a promary effluent during sewage treatment .

List the events that reduce the biological oxygen demand (Bod) of a pr

1.	List the events that reduce the biological oxygen demand (Bod) of a promary effluent during sewage treatment .
Answer» the events that reduce the BOD of a primary effuent are : 1. the primary effluent is passed into large aeration tanks where it is mechanically agitated and air is pumped into it . 2. Mechanical agitation of primary efuent leads to gowth of aerbic microbes which reduces the BOD.

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(i) Arrange the following compounds in an increasing order of basic strength : `C_(6)H_(5)NH_(2), C_(6)H_(5)N(CN_(3))_(2), (C_(2)H_(5))_(2)NH and CH_(3)NH_(2)` (ii) Arrange the following compounds in a decreasing order of `pK_(b)` values: `C_(2)H_(5)NH_(2), C_(6)H_(5)NHCH_(3), (C_(2)H_(5))_(2) NH and C_(6)H_(5)NH_(2)`
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List the events that reduce the biological oxygen demand (Bod) of a promary effluent during sewage treatment .

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