Synergetic decolorization of reactive blue 13 by zero-valent iron and anaerobic sludge

- Zero-valent iron (ZVI) enhanced anaerobic bioreduction of reactive blue 13.
- Sludge morphology and microbial community were changed by ZVI addition.
- pH and salinity were two important influential factors of the process.
- The mechanism of synergy between ZVI and sludge was elucidated.