Georgia Septic Installer Practice Test

What percentage of the solids in a septic tank are typically removed through the processes of putrefaction and fermentation?

1. 35%

2. 50%

3. 75%

4. 90%

The correct answer is: 75%

In septic systems, the breakdown of solids takes place primarily through two processes: putrefaction and fermentation. These microbial processes work to decompose the organic materials found in wastewater. Typically, about 75% of the solids in a septic tank are effectively removed as a result of these biological processes. Putrefaction involves the decomposition of organic materials by anaerobic bacteria, which thrive in the low-oxygen environment of a septic tank. Fermentation helps in breaking down substances like carbohydrates and fats. Together, these processes significantly reduce the volume of solids, preventing them from overflowing into the drain field, where they could cause blockages or other issues. Understanding that 75% of solids can be removed highlights the efficiency of septic systems in managing waste, provided they are properly maintained. This knowledge is crucial for those in the septic installation trade, as it emphasizes the importance of design and routine maintenance to ensure the system functions correctly and adheres to environmental regulations.