Advanced Biological processes have become an area of global focus as individuals, communities, industries and nations strive for ways to keep essential resources available and suitable for use. Industrial wastewater treatment effluents maybe used for industrial process or cooling water supplies. Some receiving waters are not capable of withstanding the pollution loads from the discharge of secondary effluents. Secondary treatment does not remove as much of the organic pollution in wastewater as may be assumed. The performance of secondary treatment plants is almost always measured in terms of BOD and SS removal. However, the BOD test does not measure all of the organic material present in the wastewater. when high-quality effluents are required, additional organic removal must be accomplished. In, addition to the organic materials remaining in most secondary effluents, there is an additional oxygen demand resulting from the nitrogen present in the wastewater.
Some of the advanced biological processes are: