Enhancement of textile wastewater biodegradation by biofilm formed on carriers by two halo thermophilic photosynthetic purple bacteria

Textile wastewater is considered high in salinity, alkaline pH, temperature, BOD, COD, total suspended solids (TSS) and color. This study focused on using halo-mesothermophilic PPB which formed biofilm on the biocarrier to enhance biodegrading of textile wastewater. As a result, the DN62 and DN8 strains named Rhodopseudomonas palustris DN62 and Rhodobacter sphaeroides DN8 by 16S DNA analysis were isolated and used to treat textile wastewater. They could well grow and form biofilm at 35–60 °C, pH 4–9, and salinities with 0–4 %. Cinder beads were suitable carriers for biofilm formation. The carriers attached by DN1 were supplemented into textile wastewater and after 7 days, characters of textile wastewater such as BOD, COD, TSS, chlorine, Chromium (VI) were reduced notably. In details, these indicators were reduced 97.3; 95.7; 88.8;68.9 and 56.5 %, respectively. These results give hint to develop an in-expensive, effective, and friend-ecosystem method to apply in textile wastewater treatment with raised temperature and salinity.