What are the different types of waste in water pollution?
Oxygen consuming wastes (such as biodegradable wastes), heavy metals (conservative wastes)
There are many classes in water pollution, such as thermal pollution, biodegradable (such as sewer) wastes, and biodegradable (such as total dissolved solids) wastes.
In terms of biodegradation, as long as we do not pass the assimilation capacity of a river or lake, biodegradable wastes decay in time. Domestic wastewater (not containing synthetic pills or plastics, etc.) is one example. It is biodegraded by the work of the nature when it is discharged into a river or a lake.
Another example is conservative substances that do not decay in water bodies. These wastes can be heavy metals that are not subject to natural decay. Copper or lead (such as in the dissolved form) in a river stay in the environment.