Explain the information about sewage and waste generated by houses.

(N/A) Water bodies are the lifeline of human beings as well as other animals.
Due to the disposal of all kinds of waste and other anthropogenic actions,ponds,lakes,streams,rivers,estuaries,and oceans are becoming polluted in several parts of the world.
The Government of India has passed the Water (Prevention and Control of Pollution) Act,$1974$ to protect water resources.
The sewage that comes out from houses and offices constitutes domestic sewage.
$A$ mere $0.1 \%$ of impurities make domestic sewage unfit for human use.
Solid wastes are relatively easy to remove,but dissolved salts like nitrates,phosphates,and other nutrients,as well as toxic metal ions and organic compounds present in domestic wastes,are comparatively difficult to remove.
Domestic sewage mainly contains biodegradable organic matter,which can be easily decomposed by microbes like bacteria and fungi.
These microbes use organic wastes as nutrients.
The composition of wastewater consists of $99.9 \%$ water and $0.1 \%$ impurities. These impurities include:
$1$. Suspended solids,e.g.,sand,silt,and clay.
$2$. Colloidal material,e.g.,fecal matter,bacteria,cloth,and paper fibers.
$3$. Dissolved materials,e.g.,nutrients (nitrate,ammonia,phosphate,sodium,calcium).