Recent activity in Water treatment methods

A sewage treatment plant employing activated sludge process is operated under the following conditions:Wastewater flow rate into the aeration $\operatorname{tank}=0.150 \...

Which of the following options is/are TRUE about coagulation-flocculation process?Collision of colloidal particles due to their Brownian motion results in orthokinetic fl...

Which of the following options is/are TRUE about reverse osmosis process?Reverse osmosis is used as a pretreatment for microfiltration process.Ultrafiltration is used as ...

Which ONE of the following options CORRECTLY matches the processes associated with the growth condition given in the table?$$\begin{array}{|ll|ll|}\hline & \textbf{Proces...

A common effluent treatment plant with a capacity of $2$ million litres per day (MLD) employs reverse osmosis (RO) for water reuse. The RO unit removes $95 \%$ of the tot...

​Choose the correct option(s) for removing solids from water.chlorinationcoagulation-flocculation-sedimentation followed by slow sand filtrationchlorination followed by a...

​​​​Multiple effect evaporator is commonly used, in the zero liquid discharge (ZLD) scheme, for $\_\_\_\_\_\_\_$oxidation of organic pollutantsprecipitation of heavy meta...

The processes of removal of particles in a rapid sand filter with their description is given in the table.ProcessDescription$\text{(i)}$ StrainingP:Removes only particles...

One million liters per day $\text{(MLD)}$ of wastewater with a soluble $\text{BOD}$ of $200 \mathrm{mg} / \mathrm{L}$ is treated in an activated sludge process. The $\tex...

For a biodegradable waste with a chemical formula $\mathrm{C}_{50} \mathrm{H}_{100} \mathrm{O}_{40} \mathrm{~N}$, the maximum theoretical methane production per ton of wa...

A flask (100 ml volume) has wastewater, which has $0.12 \mathrm{mg} / \mathrm{L}$ geosmin. Activated carbon is added in this flask for adsorbing geosmin as per the Freund...

You are doing an experiment to find out $\mathrm{BOD}_5$ of a wastewater. You have taken $25 \mathrm{~mL}$ wastewater having ultimate BOD of $75 \mathrm{mg} / \mathrm{L}$...

An aeration tank needs to be installed for the removal of VOC from water, where the required rate of flow of water through the aeration tank is $180,000 \mathrm{~m}^{3} /...

A river water sample has $\mathrm{pH}$ of $4$ and suspended solids concentration of $100 \; \mathrm{mg} / \mathrm{L}$. If, alum is chosen as a coagulant, what will be the...

Average values of the re-aeration rate constant for river $\mathrm{X}$ and river $\mathrm{Y}$ are $0.92$ per day and $1.12$ per day, respectively. Average de-oxygenation ...

A sewage treatment plant with a capacity of 10 million litres per day (MLD) is treating the sewage through an aerobic biological process. The inlet and outlet BOD are mea...

A centrifuge is processing 1000 litres per hour of water containing 2 g per litre of suspended solids. The thickened slurry coming out of the centrifuge has solids concen...

A flocculation tank used for water treatment has a velocity gradient $(G)$ of $800 \mathrm{~s}^{-1}$. The volume of the tank is $40 \mathrm{~m}^{3}$. The dynamic viscosit...

A sewage treatment plant $\text{(STP)}$ receives sewage at a flow rate of $20000 \mathrm{~m}^3$ per day. The sewage has $200 \mathrm{mg} / \mathrm{L}$ of suspended solids...

A facultative pond system for sewage treatment consists of two ponds in series. The hydraulic retention time $\text{(HRT)}$ of each pond is $6$ days. The total $\text{BOD...