Anammox reactor exposure to thiocyanate: Long-term performance and microbial community dynamics
2020
Yu, Xiaolong | Nishimura, Fumitake | Hidaka, Taira
Anaerobic ammonium oxidation (anammox) is an autotrophic denitrification process that has broad application potential for treating coking wastewaters. The present study estimated the effects of thiocyanate (SCN⁻), a common pollutant in coking wastewaters, on anammox processes and microbial communities in anammox reactors for over two years of continuous exposure. The addition of SCN⁻ (from 50 to 200 mg L⁻¹) showed negative effects on the denitrification performance of the anammox reactors. In SCN⁻-dosed reactors, increased effluent ammonium concentrations indicated the occurrence of SCN⁻-based biodegradation processes. Microbial analysis revealed that the anammox species almost disappeared in the reactor dosed with SCN⁻ at over 100 mg L⁻¹. Instead, an abundance of chemolithoautotrophic bacteria belonging to the Thiobacillus genus demonstrated a linear increase with SCN⁻ addition. The competition between anammox species and SCN⁻-degrading microorganisms was expected to dominate the inhibition effects of SCN⁻ addition on the performance of anammox reactors.
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