Typical BOD of domestic sewage in India is around:

The main purpose of screening in wastewater treatment is to:

In a grit chamber, the flow velocity is generally maintained at:

Which of the following is not a component of a conventional sewage treatment plant?

The detention period in a primary sedimentation tank is about:

The process of biological oxidation of organic matter under aerobic conditions is called:

Activated sludge process is:

The efficiency of a trickling filter mainly depends on:

The by-product of anaerobic sludge digestion is mainly:

The retention time in a septic tank is generally:

Imhoff tanks are used for:

The sewage having BOD more than 300 mg/L is termed as:

The permissible limit of BOD in treated wastewater for discharge into surface water is:

The biological treatment that uses microorganisms attached to media is known as:

Activated sludge process is an attached growth process.

Sludge digestion in septic tanks occurs under anaerobic conditions.

The self-purification process of a river is mainly due to re-aeration and sedimentation.

Grit chambers are used for removing floating materials from sewage.

Treated effluent from wastewater plants can be safely used for irrigation.