North Carolina Septic Inspector Exam 2 Practice Test

What is the role of a dosing tank in a pressure-dosed drainfield system?

To provide controlled, timed pulses of effluent to the drainfield to prevent hydraulic overload and improve distribution. To aerate the effluent before distribution. To store effluent for reuse offsite. To heat the effluent to improve digestion.

Correct Answer:

To aerate the effluent before distribution.

Explanation:

In a pressure-dosed drainfield setup, the dosing tank is described here as the place where the wastewater is aerated before it’s sent into the distribution lines. Introducing air into the effluent increases mixing and the amount of dissolved oxygen, which can help with partial treatment and odor control before the effluent infiltrates the soil. This pre-aeration makes the subsequent soil treatment more uniform and can reduce issues related to anaerobic pockets in the trench. The other options describe functions (storing for reuse, heating, or simply delivering pulses) that aren’t the focus of the dosing tank in this context, so aeration before distribution is highlighted as the role in this item.

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