In this study, the formation process of granules and treatment characteristics were discussed for an Upflow Anaerobic Hybrid Blanket (UAHB) reactor, adding water absorbing polymer particles (WAP) for treating a fermentation process wastewater consisting of high sulfate and ammonia. Sulfide toxicity to methanogenic bacteria and the TOC/SO42− ratio that was usually used as an index of inhibition to methanogenesis were also examined. The results indicated that the granules could be developed in an UAHB process, in which a filter was installed in the upper part of reactor and WAP were also added into inoculum, for treating sulfide- and ammonia-rich wastewater, and inhibition caused by sulfide did not occurred when free hydrogen sulfide concentration was less than 200 mgl−1. Therefore, the UAHB process in the presence of adding WAP was shown to have a better stability for treating the refractory wastewater. The results also showed that total dissolved sulfide concentration had to be considered for inhibition assessment as well as the TOC/SO42− ratio.

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