Question

Chlorine usage in water treatment of 20,000 m3 of water is 8kg in a day . Residual chlorine after 10 minutes contact tune is 0.2mg/l.The chlorine demand is

Answer 1

Answer:

UV water treatment and disinfection

Environmentally-friendly and energy-saving water treatment and disinfection with UVincludes treatment of ballast water, industrial process water, drinking water, municipal sewage and water for aquaculture, agriculture and horticulture.

Water treatment and disinfection with high-energy UV radiation is an environmentally-friendly method established more than 100 years ago. It uses no chemicals, such as chlorine or ozone.

Special UV lamps destroy microorganisms including bacteria, viruses and parasites and help decompose chemicals harmful to health.

UV treatment does not affect the smell or taste of the water.

This UV solution is used for example for treating ship ballast water, industrial process and drinking water, municipal sewage, industrial waste, water treatment for aquaculture and agriculture, and in recycling processes.

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Answer 2

Answer:

Water treated per day = 20,000 m3 = 20×106 liters/day

Chlorine consumed per day = 8 kg = 8×106 mg/day

∴ Chlorine used per liter of water = 8×106/20×106 = 0.4 mg/l

Also, residual chlorine = 0.2 mg/l

Chlorine demand = 0.4 - 0.2 = 0.2 mg/l

Explanation: