Question 21
Three statements are provided here which define the terms, i.e. sludge, sewage and wastewater. Pick out the correct definition for each of these terms.
(a) The settled solids that are removed in wastewater treatment with a scraper.
(b) Water from kitchen used for washing dishes.
(c) Wastewater released from homes, industries, hospitals and other public buildings.
Question 21
Three statements are provided here which define the terms, i.e. sludge, sewage and wastewater. Pick out the correct definition for each of these terms.
(a) The settled solids that are removed in wastewater treatment with a scraper.
(b) Water from kitchen used for washing dishes.
(c) Wastewater released from homes, industries, hospitals and other public buildings.
(a) Sludge: Semi-solids such as faeces that settle down during wastewater treatment are called sludge. This sludge is removed using a skimmer and then is transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas.
(b) Wastewater: Wastewater is generated in homes, industries, agricultural fields and in other human activities. Wastewater is rich in lather, mixed with oil, black–brown water that goes down the drains from sinks, showers, toilets, laundries and is dirty. It contains a lot of impurities and is unfit for human consumption.
(c) Sewage: Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. Sewage is mainly liquid waste. It is the wastewater containing both liquid and solid wastes produced by human activities from homes, industries, hospitals, offices, etc.
(a) Sludge: Semi-solids such as faeces that settle down during wastewater treatment are called sludge. This sludge is removed using a skimmer and then is transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas.
(b) Wastewater: Wastewater is generated in homes, industries, agricultural fields and in other human activities. Wastewater is rich in lather, mixed with oil, black–brown water that goes down the drains from sinks, showers, toilets, laundries and is dirty. It contains a lot of impurities and is unfit for human consumption.
(c) Sewage: Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. Sewage is mainly liquid waste. It is the wastewater containing both liquid and solid wastes produced by human activities from homes, industries, hospitals, offices, etc.
