Biological wastewater treatment processes are primarily designed for the removal of dissolved and suspended organic matter from wastewaters. The environmental conditions are optimized to encourage growth of the micro-organisms which use the organic compounds as substrate.
Biological wastewater treatment is also capable of removing other wastewater components, including suspended solids, nitrogen, phosphorus, heavy metals and xenobiotics.
In general biological wastewater treatment is the most efficient and economical way of removing organic pollution from a wastewater
