WasteWater Operator Certification - Grade 2 Practice Test

Low gas pressure in a digester can often be attributed to a leak in the gas line or hose. When there is a leak, the gas that is supposed to be contained and pressurized within the system escapes, resulting in a decrease in overall pressure. This impacts the efficiency of the digestion process as well as the ability to collect and utilize the biogas produced. In contrast, the presence of too much air in the system can disrupt anaerobic digestion, but it generally wouldn't be a direct cause of low gas pressure; instead, it could lead to other issues such as inhibited gas production. Styrofoam buildup could impede gas flow or affect operation, but is unlikely to be a reason for low pressure as it wouldn't typically create a loss of gas to the atmosphere. High sludge temperature could actually enhance gas production under optimal conditions, so it does not correlate with low gas pressure. Thus, the most plausible cause for low gas pressure is indeed a leak in the gas line or hose.