2. Name any one organic impurity present in sewage. sewage treatment?
3Where is the solid waste disposed after screening is collected?
5. Give one harmful effect of sewage.
6. Which organism is used in vermi-composting toilets to treate human excreta?
Answers
Answer:
Q2)answer
(1) The organic impurities present in sewage are: Human faeces, Animal waste (like Animal dung), Urea (as Urine), Oil, Fruit and Vegetable wastes, Pesticides, and Herbicides, etc. (2) The inorganic impurities present in sewage are: Nitrates, Phosphatesand Metals
Q3)answer
Incineration or combustion is a type disposal method in which municipal solid wastes are burned at high temperatures so as as to convert them into residue and gaseous products. ... This process is also known as thermal treatment where solid waste materials are converted by Incinerators into heat, gas, steam and ash.
Q5)answer
Health Effects
Life-threatening human pathogens carried by sewage include cholera, typhoid and dysentery. Other diseases resulting from sewage contamination of water include schistosomiasis, hepatitis A, intestinal nematode infections, and numerous others.
Q6)answer
earthworms are the ones which are used to treat the human excreta.