List of top Environmental Management Questions on Pollution control and treatment of effluents

A high Sludge Volume Index (SVI) in an Activated Sludge Process (ASP) indicates
Sludge bulking in an activated sludge process is mainly due to
Sloughing in trickling filters usually results in
Arrange the following devices in increasing order of particulate collection efficiency for fine particles: \[ \begin{aligned} A.&\ \text{Gravity settling chamber}\\ B.&\ \text{Cyclone separator}\\ C.&\ \text{Electrostatic precipitator} \end{aligned} \]
For the removal of sub-micron particulate matter (\(\lt 1~\mu\mathrm{m}\)) from flue gases, which of the following devices generally provides the highest collection efficiency?
A trickling filter receives an organic load of \(300~\mathrm{kg\ BOD/day}\) and has a filter volume of \(150~\mathrm{m^3}\). What is the organic loading rate of the filter?
According to drinking water standards, the desirable residual chlorine at the consumer end is about
The turbidity of raw water entering a sedimentation tank is \(120\) NTU. After sedimentation, the turbidity is reduced to \(30\) NTU. What is the turbidity removal efficiency of the sedimentation process?
A sedimentation tank has a volume of \(1500~\mathrm{m^3}\) and a flow of \(3000~\mathrm{m^3/day}\). Detention time is
If the per capita water supply is \(150~\mathrm{L/day}\) and \(80\%\) becomes sewage, the sewage generated for \(10{,}000\) people is
A sudden drop in methane content with increased \(H_2S\) in biogas suggests dominance of
Denitrification reduces nitrate to nitrogen gas under
Protozoa in activated sludge primarily contribute to
If pH drops below 6 in an anaerobic digester, then methane production decreases because
A water sample shows high COD but relatively low BOD. This indicates the presence of
Sloughing in trickling filters usually results in
Sludge bulking in an activated sludge process is mainly due to
In water and wastewater analysis, Kjeldahl nitrogen (TKN) represents the sum of
A high Sludge Volume Index (SVI) in an Activated Sludge Process (ASP) indicates
If the per capita water supply is \(150~\mathrm{L/day}\) and \(80\%\) becomes sewage, the sewage generated for \(10{,}000\) people is
A trickling filter receives an organic load of \(300~\mathrm{kg\ BOD/day}\) and has a filter volume of \(150~\mathrm{m^3}\). What is the organic loading rate of the filter?
The turbidity of raw water entering a sedimentation tank is \(120\) NTU. After sedimentation, the turbidity is reduced to \(30\) NTU. What is the turbidity removal efficiency of the sedimentation process?
According to drinking water standards, the desirable residual chlorine at the consumer end is about
The unit of coefficient of permeability is
A sedimentation tank has a volume of \(1500~\mathrm{m^3}\) and a flow of \(3000~\mathrm{m^3/day}\). Detention time is