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2. Manual scavenging - Wikipedia

   en.wikipedia.org/wiki/Manual_scavenging

   The cleaning of dry toilets and carrying of waste to points of disposal is generally done by women, while men are involved in the cleaning of septic tanks and sewers. There is an economic reason for this distribution - the municipality employs workers to clean sewers and septic tanks and hence the salary is better.

3. 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]

4. Maceration (sewage) - Wikipedia

   en.wikipedia.org/wiki/Maceration_(sewage)

   [2] [3] When this process is complete, the wastewater is pumped to a soil stack or septic tank through a single small diameter pipe (¾ inch or 1 inch) that is much easier to install on site. [4] [5] Macerator maintenance includes regular cleaning and inspection to prevent plaque and clogging. [6]

5. Sewerage - Wikipedia

   en.wikipedia.org/wiki/Sewerage

   This has resulted in large percentages of the population being connected. For example, the Netherlands have 99% of the population connected to the system, and 1% has an individual sewage disposal system or treatment system, e.g., septic tank. Others have slightly lower (although still substantial) percentages; e.g., 96% for Germany.

6. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

7. Self-cleaning surfaces - Wikipedia

   en.wikipedia.org/wiki/Self-cleaning_surfaces

   Self-cleaning surfaces are a class of materials with the inherent ability to remove any debris or bacteria from their surfaces in a variety of ways. The self-cleaning functionality of these surfaces are commonly inspired by natural phenomena observed in lotus leaves, gecko feet, and water striders to name a few.