Question

Phosphate pollution is caused by

(a) sewage and phosphate rock

(b) sewage and agricultural fertilizers

(c) phosphate rock only

(d) agricultural fertilizers only.

Answer 1

• It's answer is option(b)
• ​Cause :-it's main cause are as following describe below.

1. Fertiliser - The phosphorus is present in the fertilisers in large quantity to increase the productivity of the soil present in the form of orthophosphate. Which is required by the plants for their growth as well enters in there food chain through plants where it is taken by the other animals for there growth and metabolism.
2. Sewage - The waste such as faecal matter, waste food, detergents and certain soap also contain phosphorus the untreated Sewage water entera in the water and cause water pollution.

• Effects :-

1. ​Eutrophication - The water from water treatment plants enters into the rivers, canals and into other water bodies also untreated waste water which contain phosphorus were taken by phytoplankton which grow in large quantity and also algal blooms are formed.which results in the death of many aquatic organism which depends on oxygen for the respiration.
2. Water which contain high quantity of phosphorus affect health of human beings also such as many problems of stomach, premature aging and cancer.

• Treatment:-

1. ​Some of the phosphorus entering the treatment plant is removed by primary (settling) and secondary treatment in this phosphorus remains in the solid form.
2. Additional phosphorus is removed by adding ferric chloride, ferrous sulphate and alum.