What are the various constituents of domestic sewage? Discuss the
effects of sewage discharge on a river.
Answers
Answer:
Explanation:
Domestic sewage is the waste water(sewage) discharged from residential areas. It consists of various constituents such as
Dissolved materials in the form of both organic and inorganic compounds like toxic metal ions, nitrates, ammonia etc.
Colloidal particles also in both organic and inorganic forms like fecal matter, paper, cloth fibers, bacteria etc.
Suspended impurities mainly consist of sand and clay.
Being rich in biodegradable or organic matter, domestic sewage stimulates microbial growth for the decomposition process to occur. This increases Biochemical oxygen demand of water and stimulating mineral pollution or eutrophication. It imparts bad color and odor to the water body and also paves way for waterborne diseases.
Answer:
Domestic sewage is the waste originating from the kitchen, toilet, laundry, and other sources. It contains impurities such as suspended solid (sand, salt, clay), colloidal material (fecal matter, bacteria, plastic and cloth fiber), dissolved materials (nitrate, phosphate, calcium, sodium, ammonia), and disease-causing microbes. When organic wastes from the sewage enter the water bodies, it serves as a food source for micro-organisms such as algae and bacteria. As a result, the population of these micro-organisms in the water body increases. Here, they utilize most of the dissolved oxygen for their metabolism. This results in an increase in the levels of Biological oxygen demand (BOD) in river water and results in the death of aquatic organisms. Also, the nutrients in the water lead to the growth of planktonic algal, causing algal bloom. This causes deterioration of water quality and fish mortality.
Explanation:
note: Important point are marked as bold