Question

Chemical equation of bleaching powder kept open in air

Answer 1

Calcium oxychloride
CaOCl2 + CO2

Answer 2

Wastewater treatment is a process used to convert wastewater into an effluent(outflowing of water to a receiving body of water) that can be returned to the water cycle with minimal impact on the environment or directly reused. The latter is called water reclamationbecause treated wastewater can then be used for other purposes. The treatment process takes place in a wastewater treatment plant (WWTP), often referred to as a Water Resource Recovery Facility (WRRF) or a sewage treatment plant. Pollutants in municipal wastewater (households and small industries) are removed or broken down.

The treatment of wastewater is part of the overarching field of sanitation. Sanitation also includes the management of human waste and solid waste as well as stormwater (drainage) management.[1] By-products from wastewater treatment plants, such as screenings, grit and sewage sludge may also be treated in a wastewater treatment plant.[2]:Ch.14 In Kolkata, wastewater is treated naturally using tropical algae, making its wetlands the largest ecological sewage treatment facility in the world.[3]

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