waste water story class7

Sludge in separate tanks is decomposed to get biogas by_____________________bacteria

Which one of the following is used in vermi-processing toilet?

• earthworm

• cockroach

• none of these

• both of these

Sewage is mainly a _________________-waste

Remove large objects from wastewater

Disinfect water

• ozone

• chlorine

• ultraviolet radiation

• all of these

Period 2005-2015 is being celebrated as the international decade for action on

• water for life

• education for all

• global war

Which one of the following is a step in wastewater treatment?

• Aeration

• Filtration

• Chlorination

• All of these

Which of the following is/are products of wastewater treatment?

• Biogas

• Sludge

• Both Biogas and sludge