Sewage in localities is typically treated in sewage treatment plants where it undergoes various processes like sedimentation, aeration, and filtration to remove contaminants before being released into water bodies or used for irrigation.

The percentage of biodegradable waste in households or classrooms can vary, but it often includes kitchen waste, paper, and organic materials, which usually constitute a significant portion of the total waste.

To calculate the amount of waste generated, collect and weigh the waste from home or classroom for a day. Separate it into biodegradable and non-biodegradable categories to understand the composition.

Many local bodies have mechanisms to treat biodegradable and non-biodegradable wastes separately. Biodegradable waste is often composted or converted into biogas, while non-biodegradable waste is recycled, incinerated, or sent to landfills.

In most towns and cities, local bodies like the municipal corporation or resident welfare associations have systems in place for the collection of household waste. This often involves regular waste pickup services and sometimes segregation of waste at the source.