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The process can either be thermophilic digestion, in which sludge is fermented in tanks at a temperature of 55 °C, or mesophilic, at a temperature of around 36 °C. Though allowing shorter retention time (and thus smaller tanks), thermophilic digestion is more expensive in terms of energy consumption for heating the sludge.
A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater flows for basic sewage treatment. [2] Settling and anaerobic digestion processes reduce solids and organics, but the treatment efficiency is only moderate (referred to as "primary treatment"). [2]
These basins are called primary sedimentation tanks or primary clarifiers and typically have a hydraulic retention time (HRT) of 1.5 to 2.5 hours. [5]: 398 The settled and floating materials are removed and the remaining liquid may be discharged or subjected to secondary treatment. Primary settling tanks are usually equipped with mechanically ...
These typically run in the $100-$200 range plus the cost of installing a holding tank and an extra few bucks to chemically treat the waste for odor and bacteria.
Tanks put in the intermediate category fell somewhere in between. Only well-maintained septic tanks showed some reduction in sludge build-up. To determine if the reduction could be attributed to pit additives, a follow-up study investigated the impact of three additives on just the well-maintained septic tanks. Overall, the research concluded ...
A septic drain field, a septic tank, and associated piping compose a septic system. The drain field typically consists of an arrangement of trenches containing perforated pipes and porous material (often gravel ) covered by a layer of soil to prevent animals (and surface runoff ) from reaching the wastewater distributed within those trenches. [ 1 ]
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