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<p>A modified multi-tank anaerobic-anoxic–oxic activated sludge process was designed and operated for nutrient removal from real domestic sewage. With suspended carriers fabricated and aerobic biofilm pre-hung, the effects of two distinct suspended carriers (Carrier A and Carrier B) on pollutant removal was investigated under the following conditions: carrier volume filling ratio, 30%; hydraulic retention time (HRT), 10 h; sludge return ratio, 75%; and solids retention time (SRT), 14 d. Experimental results showed that all groups achieved COD removal efficiencies exceeding 85% and ammonia nitrogen (NH<sub>3</sub>-N) removal efficiencies exceeding 95%, with effluent meeting the Grade A requirements of the “Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants” (GB 18918–2002). However, regarding total nitrogen (TN) and total phosphorus (TP) removal, Carrier B demonstrated superior performance to Carrier A, achieving significantly enhanced nitrogen and phosphorus removal—increasing removal rates by approximately 10–20 percentage points. In summary, Carrier B exhibited superior capability for deep nitrogen and phosphorus removal from low C/N-ratio wastewater, providing a technical reference for the optimized application of suspended carriers in multi-tank A/O systems.</p>

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Influence of Suspended Carriers on Pollutants Removal by Multi-tank A/O Process

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Kai Ma,
  • Rui Min,
  • Shuai Guo,
  • Yu Kang,
  • Tianhong Zhou

摘要

A modified multi-tank anaerobic-anoxic–oxic activated sludge process was designed and operated for nutrient removal from real domestic sewage. With suspended carriers fabricated and aerobic biofilm pre-hung, the effects of two distinct suspended carriers (Carrier A and Carrier B) on pollutant removal was investigated under the following conditions: carrier volume filling ratio, 30%; hydraulic retention time (HRT), 10 h; sludge return ratio, 75%; and solids retention time (SRT), 14 d. Experimental results showed that all groups achieved COD removal efficiencies exceeding 85% and ammonia nitrogen (NH3-N) removal efficiencies exceeding 95%, with effluent meeting the Grade A requirements of the “Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants” (GB 18918–2002). However, regarding total nitrogen (TN) and total phosphorus (TP) removal, Carrier B demonstrated superior performance to Carrier A, achieving significantly enhanced nitrogen and phosphorus removal—increasing removal rates by approximately 10–20 percentage points. In summary, Carrier B exhibited superior capability for deep nitrogen and phosphorus removal from low C/N-ratio wastewater, providing a technical reference for the optimized application of suspended carriers in multi-tank A/O systems.