List out the industrial waster the cause water pollution and what are the international standards fixed for drinking water ?

Explanation

Industrial wastes from food processing plants and paper and pulp mills are oxygen - demanding wastes. So they cause depletin of D.O from the water .
Salts , trace of elements like Copper, Zince Arsenic etc., metals coming out of chromiun plating Industry pollute water . They effect the human health and aquatic animals .
In Japans , at Minimata , water was polluted with mercury released from industry. The mercury enter the fish and the people who consumed the fish are adversely effected .
Mining and Nuclear power plant pollute the water with radioactive substances.
International standards for drinking water .
Fluoride concentration .
`to` The drinking water sample is tested for fluoride ion concentration . Its deficiency causes diseases like tooth decay etc.
`to` The permissible level of concentration fo fluroride in water is upto 1 ppm .
`to` Fluoride concentration above 2 ppm causes brown mottling to teeth.
`to` Fluoride concentration greater than 10 ppm cause harmful effects to bones and teeth.
Lead :
`to` The prescribed upper limit of concentration limit of lead in drinking water is about 50 ppm.
`to` Lead can damage kidney , liver , reproductive systm etc.
Sulphate :
`to ` Sulphate concentration greater than 500 ppm in drinking water causes laxative effect .
Nitrate :
Nitrate :
`to` Nitrate concentration maximum limit in drinking water is about 50 ppm.
`to` Excess of nitrate in drinking causes such as methemoglobinemia .
Metals :
Maximum prescribed concentration of some common metals recommended in drinking water causes laxative effect .
Nitrate :
`to` Nitrate concentration maximun limit in drinking water is about 50 ppm.
`to` Excess of nitrate in drinking causes disease such as methemoglobinemia.
Metals :
Maximum prescribed concentration of some common metals recommeded in drinking water given in the following table .