Waterpollution 120723084227-phpapp02
The document discusses various sources and types of water pollution including rain water, ground water, surface water, domestic sewage, industrial effluents, agricultural discharge, pathogens, toxic elements, radioactive pollutants, and thermal pollutants. It notes that contaminated water can pose health hazards and be unsuitable for drinking or other purposes due to objectionable color, odor, turbidity, hardness, acidity or alkalinity. Waterborne infectious diseases are a major health risk from drinking contaminated water, while biodegradable and non-biodegradable wastes, pesticides, phosphates, nitrates and industrial chemicals can accumulate in human tissues through the food chain. Standards, monitoring, treatment and government laws are needed to
Waterpollution 120723084227-phpapp02
- 1. Any alteration in the physical or chemical or biological properties of water and the contamination with any unwanted foreign substances, which would contribute a health hazard or otherwise decrease the utility of water
- 2. Rain Water Ground Water Well, Springs, etc. Surface Water Sea, Ocean, River, Pond, Lake, etc.
- 3. Domestic Sewage Industrial Effluents Run off from land and fields Pathogens Agricultural Discharge Oil Toxic Elements Radioactive Pollutants Thermal Pollutants
- 4. Objectionable color and odour is unacceptable and unsuitable for drinking and other purposes. Highly turbid and very hard water is unpleasant to drink, food processing Acid and alkaline water cause serious health problem Water borne infectious enteric disease like typhoid, cholera, dysentery, are the predominant health hazard arising from drinking contaminated water Radioactive pollution enter human body through food and get accumulated in thyroid gland, liver, bones and muscles
- 5. Biodegradable waster deplete D O in the receiving stream, affect the flora cause creates anaerobic conditions Non biodegradable waste and pesticides travel the food chain and ultimately reach human where they accumulate in fatty tissues Thermal discharge in stream depletes D O Phosphate, nitrate, promote the growth of algae and encourage eutrophication Industrial effluents result in addition of poisonous chemicals such as arsenic, mercury, lead may reach human body through contaminated food.
- 6. Lay down standard for Drinking water Disposal of waste water into water course/sewer/land Monitoring Government laws Treatment Domestic treatment Screening Sedimentation Filtration, pH adjustment Disinfection
- 7. Waste water treatment Preliminary treatment Primary treatment Secondary treatment Advanced treatment