Question

Identify the low-cost onsite sewage disposal system.
A. Septic tank
B. Composting pits
C. Chemical toilets
D. All of the above

Answer 1

Hint: Sewage system is very important for disposal of wastes. Various methods are used to improve sanitation. Low cost onsite sewage disposal systems are being encouraged to improve waste disposal. Septic tanks, chemical toilets and composting pits are examples of low cost onsite sewage disposal.

Complete step by step answer: Septic tanks are made in the areas where there is no sewage system. For example: hospitals, isolated buildings, or a cluster of 4 to 5 houses. Septic tanks separate wastes into three layers: solids, effluent and scum. It is used to break down sewage by the action of bacteria on wastes.
Composting pits include excreta released from toilets. Some organizations use on site human waste disposal technology to offer hygiene. They do not require scavenging, excreta from the toilet seats flow through covered drains into the biogas plant. Biogas plants use animal dung or human excreta to produce biogas which is used as a source of energy.
Chemical tanks have special chemicals in holding tanks so that they can reduce the odors of excreta. Human excreta collect into the holding tank. These toilets are usually self contained and movable. Size of chemical tanks is usually small so that it can be emptied frequently.
From the above information we can say that all of the above mentioned methods are low-cost sewage disposal systems.
Therefore, the correct answer is option D.

Note: Domestic wastes produced by urban residences, institutions etc. is usually collected into pipes called sanitary sewers. In rural residences, it is collected in septic tanks. The septic tank is the oldest waste disposal process. Vermi-composting can be done through machinery recycling processes and it can reproduce some natural elements for an effective waste disposal process.