The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?

Related Mcqs:

Fresh sewage is ______________ in nature?

A. Acidic B. Neutral C. Alkaline D. Highly acidic...

Pick out the correct statement ?

A. Deforestation helps in controlling the green house effect B. Global warming is detrimental for increase in food productivity and may cause flood and cyclone C. Lightening discharges are natural source of production of SO2 & H2S pollutant D. Sulphur dioxide causes death by asphyxiation...

Which of the following pollutants, if present in atmosphere is detectable by its odour ?

A. CO B. SO2 C. NO2 D. CO2...

Siderosis is a disease caused by the inhalation of ______________ dust?

A. Coal B. Silica C. Iron D. None of these...

Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?

A. Acts as a green house gas thereby raising earth’s temperature B. Causes asphyxia C. Causes increase in sea level D. Enhances the green house effect...