Biodegradation of dyes in textile wastewater using local fungal isolates

Textile wastewater contains dyes and excessive amounts of nitrogen, phosphorus, and metal compounds, as well as organic pollutants that. Wastewater also contains chemical wastes that are not biodegradable that can cause infectious disease. The chemical and biological waste in sewage and water must be broken down before it is deposited to the soil and environment. The extensive use of dyes often causes pollution problems. The presence of very low concentrations of dyes in large water bodies is shown to be highly visible and indisputable and also reduced light penetration and photosynthesis. In addition some dyes either toxic or mutagenic and carcinogenic. In this study, waste water was treated by microbial isolates from Egyptian soil. The potent fungal isolate used for the degradation of the excess dye used in textile industry and waste water. The study investigated the biodegradation process under different growth conditions. Different parameters were involved , dyes concentration, inoculum size incubation time, temperature, and growth medium. The decolorization efficiency for these dyes were investigated. Reactive yellow 145 is used the maximum wave lengthof 475. These isolates were belong to species such as Aspergillus niger, A.ochraceous, Mucor recemosus , Penicilluim notatum and P. chrysogenium. After they screened for optimum efficiency and the condition for temperature and pH which optimized and the effectiveness of biodegradation process. The results showed that the maximum decolorization 65.77% was obtained at pH 6.5, fermentation time of 6 day, dye concentration of 90mg/h, and agitation rate 200 rpm.at 30C0.