● Human beings have been `color{violet}"abusing the water-bodies"` around the world by using them for `color{violet}"disposal of all"` `color{violet}"kinds of waste"`.
● We tend to believe that `color{violet}"water can wash away"` everything not taking cognizance of the fact that the `color{violet}"water bodies"``color{violet}" are our lifeline"` as well as that of all other living organisms.
● Due to such activities of human kind the`color{violet}" ponds, lakes, stream"`, `color{violet}"rivers, estuaries and oceans"` are becoming polluted in several parts of the world.
● Realising the importance of `color{violet}"maintaining the cleanliness"` of the water bodies, the Government of India has passed the `color{Brown}"Water (Prevention and"` `color{Brown}"Control of Pollution"``color{Brown}") Act, 1974"` to safeguard our water resources.
● As we work with water in our homes in the cities and towns, we `color{violet}"wash everything into drains"`.
● A mere `color{violet}"0.1 per cent impurities"` make domestic sewage `color{violet}"unfit for human use"`.
● `color{violet}"Solids"` are relatively `color{violet}"easy to remove"`, what is difficult to remove are dissolved salts such as `color{violet}"nitrates, phosphates"`, and other nutrients, and `color{violet}"toxic metal ions"` and `color{violet}"organic compounds"`.
● Domestic sewage primarily contains `color{violet}"biodegradable organic matter"`, which readily decomposes – thanks to `color{violet}"bacteria"` and other micro-organisms, which can multiply using these `color{violet}"organic substances as substrates"` and hence utilise some of the components of sewage.
● It is possible to estimate the `color{violet}"amount of organic matter"` in sewage water by measuring `color{Brown}"Biochemical Oxygen Demand (BOD)"`.
● Micro-organisms involved in `color{violet}"biodegradation of organic matter"` in the receiving water body consume a `color{violet}"lot of oxygen"`, and as a result there is a `color{violet}"sharp decline in"` `color{violet}"dissolved oxygen"` downstream from the point of sewage discharge.
● This causes `color{violet}"mortality of fish"` and other aquatic creatures.
● Human beings have been `color{violet}"abusing the water-bodies"` around the world by using them for `color{violet}"disposal of all"` `color{violet}"kinds of waste"`.
● We tend to believe that `color{violet}"water can wash away"` everything not taking cognizance of the fact that the `color{violet}"water bodies"``color{violet}" are our lifeline"` as well as that of all other living organisms.
● Due to such activities of human kind the`color{violet}" ponds, lakes, stream"`, `color{violet}"rivers, estuaries and oceans"` are becoming polluted in several parts of the world.
● Realising the importance of `color{violet}"maintaining the cleanliness"` of the water bodies, the Government of India has passed the `color{Brown}"Water (Prevention and"` `color{Brown}"Control of Pollution"``color{Brown}") Act, 1974"` to safeguard our water resources.
● As we work with water in our homes in the cities and towns, we `color{violet}"wash everything into drains"`.
● A mere `color{violet}"0.1 per cent impurities"` make domestic sewage `color{violet}"unfit for human use"`.
● `color{violet}"Solids"` are relatively `color{violet}"easy to remove"`, what is difficult to remove are dissolved salts such as `color{violet}"nitrates, phosphates"`, and other nutrients, and `color{violet}"toxic metal ions"` and `color{violet}"organic compounds"`.
● Domestic sewage primarily contains `color{violet}"biodegradable organic matter"`, which readily decomposes – thanks to `color{violet}"bacteria"` and other micro-organisms, which can multiply using these `color{violet}"organic substances as substrates"` and hence utilise some of the components of sewage.
● It is possible to estimate the `color{violet}"amount of organic matter"` in sewage water by measuring `color{Brown}"Biochemical Oxygen Demand (BOD)"`.
● Micro-organisms involved in `color{violet}"biodegradation of organic matter"` in the receiving water body consume a `color{violet}"lot of oxygen"`, and as a result there is a `color{violet}"sharp decline in"` `color{violet}"dissolved oxygen"` downstream from the point of sewage discharge.
● This causes `color{violet}"mortality of fish"` and other aquatic creatures.