Name two inorganic impurities present in sewage.

State whether the following statements are True or False. In case a statement is false, write the correct statement.

(a) Sewage is a solid waste which causes water pollution and soil pollution.

(b) Used water is wastewater.

(c) Wastewater could be reused.

(d) Where underground sewerage systems and refuse disposal systems are not available, the high-cost on-site sanitation system can be adopted.

How are open drains harmful for human health?

Animal waste, oil and urea are some of the organic impurities present in sewage. Name two more organic impurities present in sewage.

Name two alternative arrangements for sewage disposal where there is no sewerage system.