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The overall performance, microbial community and enzymatic task of activated-sludge from four identical sequencing group reactors (SBRs) had been compared by dealing with synthetic wastewater beneath the single and combined divalent copper (Cu2+) at 20 mg/L and humic acid (HA) at 20 mg/L. Weighed against the lack of Cu2+ and HA, the solitary HA somewhat improved the oxygen uptake price (OUR), the nitrification and denitrification prices together with activities of dehydrogenase, nitrifying

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