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2. Imhoff tank - Wikipedia

   en.wikipedia.org/wiki/Imhoff_tank

   The lower chamber requires separate biogas vents and pipes for the removal of digested sludge, typically after 6–9 months of digestion. [2] The Imhoff tank is in effect a two-story septic tank [3] and retains the septic tank's simplicity while eliminating many of its drawbacks, which largely result from the mixing of fresh sewage and septic ...

3. Aerobic treatment system - Wikipedia

   en.wikipedia.org/wiki/Aerobic_treatment_system

   The aeration stage and the disinfecting stage are the primary differences from a traditional septic system; in fact, an aerobic treatment system can be used as a secondary treatment for septic tank effluent. [1] These stages increase the initial cost of the aerobic system, and also the maintenance requirements over the passive septic system.

4. Septic tank - Wikipedia

   en.wikipedia.org/wiki/Septic_tank

   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 ]

5. Onsite sewage facility - Wikipedia

   en.wikipedia.org/wiki/Onsite_sewage_facility

   Most onsite wastewater treatment systems are of the conventional type, consisting of a septic tank and a subsurface wastewater infiltration system (SWIS). Site limitations and more stringent performance requirements have led to significant improvements in the design of wastewater treatment systems and how they are managed.

6. Mound system - Wikipedia

   en.wikipedia.org/wiki/Mound_system

   The mound system includes a septic tank, a dosing chamber, and a mound. Wastes from homes are sent to the septic tank where the solid portion sinks to the bottom of the tank. Effluents are sent to a second tank called a dosing chamber, from which they are distributed to the mound at a metered rate (in doses).

7. 13 Things You Should Never, Ever Carry in Your Wallet - AOL

   www.aol.com/finance/13-things-never-ever-carry...

   Spare keys in your wallet might seem like a good idea — until you lose them. Now, some random guy could be two steps away from showing himself in. Better call: leave a spare with a buddy or ...