Which of the following processes is involved in the biochemical treatment of sewage effluents
Freshwater carrying pipelines in chemical industries are coloured with
Which of the following is the most lethal water pollutant
In water chemical treatment plant, use of chloramines ensures
Both liquid fire and gaseous fire can be extinguished by
Factor of safety or overdesign factor in heat transfer equipment is about ........... per cent more than the actual theoretical design factor.