[amp_mcq option1=”Free board of 0.3 m may be provided” option2=”The baffles or tees are extended up to top level of scum” option3=”The clear space between the baffle top and covering slab is about 7.5 cm” option4=”All the above” correct=”option4″]
The correct answer is D. All the above.
A septic tank is a watertight container that receives wastewater from a home or business. The wastewater is treated in the tank by anaerobic bacteria, which break down the organic matter. The treated wastewater then flows out of the tank and into a drain field, where it is further treated by soil and plants.
The free board of a septic tank is the distance between the liquid level in the tank and the top of the tank. The free board should be at least 0.3 m (1 foot) to prevent the tank from overflowing.
The baffles or tees in a septic tank are designed to prevent scum and sludge from building up in the tank. The baffles or tees are extended up to the top level of scum to prevent scum from floating to the surface of the tank.
The clear space between the baffle top and covering slab is about 7.5 cm (3 inches) to allow for access to the tank for maintenance.
All of these features are important for the proper functioning of a septic tank. If any of these features are not present or are not working properly, the septic tank may not be able to treat the wastewater effectively. This can lead to problems such as sewage backups and contamination of groundwater.