Thus, biological treatment methods are of utmost importance, as they work without adversely affecting the environment as in the case of physicochemical treatment processes (Bajpai et. al, 1994), which are also an economic burden on the industry because of the expensive infrastructure and maintenance required for their implementation.
Besides, the problem of accumulation of such components in some other form, at some other site is another crucial drawback which can be overcome by using biological treatment methods.
Supernatant wastewater after physio-chemical treatments flows continuously into a tank where acclimatized WWTDSCARE is added into the wastewater @ 1gm /m3 to mix it with the bio sludge.
Sludge is activated when WWTDSCARE is added to it, since the microbes present in the sludge can take the dissolved solids as their nutrition.
Constituents of WWTDSCARE will provide the oxygen needed for the microorganisms present in WWTDSCARE to break down the organic pollutants.
The mixed Waste Water flows to a settling compartment, where the bio sludge settles out and part of the settled sludge is returned to the first tank to maintain a high population of microbes to break down the organics.
The activated sludge process (ASP) is currently the most widely used biological treatment process.
ASP allows microorganisms to adapt to change in wastewater composition with relatively short acclimation time and also allows a greater degree of control over acclimated bacterial population.