Waste Water Story-I

Water containing pollutants is termed wastewater, which requires treatment before safe discharge or reuse. Pure water is free of contaminants, potable water is safe for drinking, and salty water refers to high mineral content - none of these describe pollutant-containing water.

Disease is not a cause of scarcity of fresh water, because it does not affect the water level.

The Indus Valley Civilization at Harappa and Mohenjodaro created the world's first known urban sanitation system around 2500 BCE, featuring covered drains and indoor plumbing in many houses. Later civilizations like the Vedic, Mauryan, and Gupta periods did not develop comparable urban sanitation infrastructure.

Sewage treatment is the correct term for the process of removing contaminants from wastewater. Water management is too broad, water harvesting is about collecting rainwater, and water cleaning is not the technical term used in environmental engineering.

The United Nations proclaimed 2005-2015 as the International Decade for Action 'Water for Life' to focus on water-related issues globally. This decade-long initiative aimed to promote sustainable water management and improve access to clean water and sanitation.

Microbes (bacteria and other microorganisms) are naturally present in water and soil, and are not causes of water pollution themselves - in fact, beneficial microbes help break down pollutants. Open defecation, chemical pesticides, and animal waste are all significant anthropogenic sources of water contamination.

Human faecal wastes mixed with waste water is sewage.

Contaminants is the correct term for dissolved and suspended impurities in water. Feces refers to solid waste (misspelled as 'Faces'), sludge is semi-solid byproduct of treatment, and biogas is a fuel gas produced from organic matter breakdown - none describe dissolved/suspended impurities.

Metals are the inorganic impurity in the waste water.

Water from dams is not a source of sewage.

Dysentery is caused by bacteria.

Sewers are the network of pipes that carry wastewater away from buildings. An aquifer is an underground water reservoir, tanks store water, and sanitation is the broader concept of maintaining hygienic conditions - none refer specifically to the pipe network.

Nitrogen and phosphorus are inorganic Impurities in the sewage water.

Treatment activities are where sewage goes for processing, not where it originates. Toilets, kitchens, and commercial organizations are all sources that generate sewage - these are points of origin. Treatment facilities are the destination where sewage is processed.

The sewerage system is the network of pipes that transports wastewater and sewage from homes, businesses, and industries to treatment plants or disposal points. This includes both sanitary sewage (from toilets, sinks) and stormwater runoff. The other options refer to components or sources, not the transport system itself.

Aeration, filtration, and chlorination are all treatment processes used to clean water - they are actions taken to improve water quality. Sludge is the semi-solid byproduct that remains after treatment, not a process itself. It's the odd one out because it's a substance rather than an action.

Aerator is used to add oxygen to polluted water.

Waste Water Treatment Plant

Chlorination is the process of adding chlorine or chlorine compounds to water for disinfection. Using chlorine tablets is a common method, especially for point-of-use treatment or in emergency situations. The chlorine kills harmful microorganisms, making water safe for drinking.

Oil and grease are removed from waste water by skimmers.

Bar screen removes rags, cans, plastics packets from the waste water

Grit remove solid waste like faeces from waste water

Malaria is not a waterborne disease.

Fruit and vegetable waste is an organic impurity present in waste water.

Sullage water is produced by kitchen activities.