Successful operation of a pilot scale ZVI-UASB reactor for real dye wastewater treatment

摘要

The first pilot-scale ZVI-UASB reactor enlarged from laboratory-scale was used to enhance actual dye wastewater treatment in Haicheng, China. During 191 days' operation, the average COD removal maintained well at about 90% with the fluctuant influent in this reactor, while it was only 18.3% in the local anaerobic treatment equipment. Granularity analysis and SEM observation showed that the average particle size of the sludge increased to 486 μ m, and the surface of the granular sludge is dense. FISH analysis confirmed that the relative content of archaea was increased to 62.5%, which was significantly higher than that in the local anaerobic tank (32.3%). PCR-DGGE results indicated that the microbial communities shifted during their adaptation process for actual dye wastewater treatment. The first pilot-scale ZVI-UASB reactor was started-up successfully for actual dye wastewater treatment, the excellent treatment performance and stable operation were achieved not only high COD removal but also effective color removal.