Wastewater discharges from industrial sources contain a wide range in levels of COD, BOD, TSS and other emerging contaminants (i.e. pharmaceuticals, aldehydes, glycol, amines, alcohols, complex proteins, etc). This includes process water from industries such as textile plants, dairies, breweries, pharmaceutical industry, paper & pulp, cosmetic, chemical and other production facilities.
Ozonation process has a complex impact on water/wastewater parameters – it reduces color, improves taste, odor, kills bacteria, viruses, oxidize iron, manganese, cyanide, phenol, benzene, chlorophenol, atrazine, nitrobenzene and other pollutants. Ozonation process shall increase the biodegradability of wastewater and the COD:BOD ratio from an industry water.
MLR is an internal recirculation from aerobe to anox tanks and RAS is from secondary sedimentation to incoming flow from primary treatment. The high water content, compressible and colloidal nature of the sludge are common characteristics found in IWWTP. Filamentous bacteria are a normal part of the activated sludge microflora while excessive long filaments lead to sludge bulking and prevent flocculation. Using an ozonation process in the RAS flows promotes the growth of floc forming bacteria and inhibit the activity of filamentous bacteria which enhanced sludge bulking and sedimentation.
Anaerobic digestion is a sequence of biological processes in which microorganism breakdown biodegradable material in the absence of oxygen. During anaerobic treatment about 50 % of the organic matter in the sludge is susceptible to biodegradation into biogas, the other half of the organic material being more recalcitrant and degrading slowly. Sludge ozonation leads disintegration of complex organic substances into bio-degradable low-weight molecular compounds, which increases the biogas yield.