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The long-term effects of Ni(II) on substrate removal and microorganism activities were investigated by operating sequencing batch reactors (SBRs). Compared to the control system lacking Ni(II), the removal efficiencies of total organic carbon (TOC) and ammonium nitrogen (NH 4+ -N) in SBR system loading with 10mgL −1 Ni(II) decreased drastically from 90.2±3.6 percent to 75.0±8...
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