Study On The Enhancement Of Biodegradability Of Dyeing And Printing Wastewater By Anaerobic Baffled Reactor

Textile printing and dyeing is always as one of the advantage traditional industries of China. Since the 90s of 20th century, it gained a rather rapid development. Following this, the consumption and discharging of water is also substantial increased. This mixed wastewater with dramatic impact load consists of complicated compositions, and is hard to be biodegraded. The biological technologies are usually used to treat this kind of water, and the key part of this technology is Hydrolysis. It is used to increase the biodegradability of wastewater to meet the requirement of the following biological treatment.This study researched that pretreated the dye-based industrial waste water using an ABR on the Luzhi town of Suzhou to improve its biodegradability, and create favorable conditions for the biological treatment. The results show that the treated wastewater with ABR, some macromolecular refractory organic matter is decomposed into small molecular organic compounds, Chroma from 160 down to 90, B/C value increased to 0.31 from 0.22.Large numbers of investigations were operated to the factors of HRT and pH of wastewater, which affected the treatment effect. Studying the different conditions including different HRT—6h,10h,12h,18h, and different pH—6,7,8, and whether there is granular sludge in the reactor. The results show that the treatment effect is the best when HRT ranged from 6h to 12h, ph=7.The study researched the effects of ABR combined with Fenton reagent. The result shows that Fenton reagent is helpful to improve the effect. Considering the economy, the dosage of Fenton reagent should be controlled. Small pilot tests also show that, adding too much Fenton reagent will course a shortage of the carbon resources. The concentration of Fenton reagent should be about 150ppm, and this can meet the requirement of following biological treatment well.