Q17. How can we contribute in maintaining sanitation at public places?
Q18. What is sewage treatment?
Q19. Explain the function of bar screens in a wastewater treatment plant.
Q20. Outline your role as an active citizen in relation to sanitation.
Q21. What is sludge? Explain how it is treated.
Q22. Untreated human excreta is a health hazard. Explain.
Q23. What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.
Q24. Suggest some alternative arrangement for sewage disposal.
Q25. Explain the relationship between sanitation and disease.
State the effects of poor sanitation.
Q26. List some ways to minimise or eliminate waste and pollutants at their source.
Q27. Describe the steps involved in getting clarified water from wastewater.