State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, PR China; Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
J Environ Manage. 2019 Mar 1;233:69-75. doi: 10.1016/j.jenvman.2018.12.027. Epub 2018 Dec 14.
To understand the ability of an upflow microaerobic biofilm reactor (UMBR) to remove nutrient from manure-free swine wastewater rich in NH with a COD/TN ratio less than 1.00, effect of hydraulic loading rate (HLR) on the microaerobic process was evaluated with a constant reflux ratio of 25 at 25 °C. The results showed that changes in HLR had a remarkable effect on the performance of the UMBR in nutrient removal from the wastewater. With the favorable HLR 3.0 m/(m·d) (Hydraulic Retention Time (HRT) 8 h), average removal of COD, NH and TN in the microaerobic process reached 59.3%, 87.7% and 84.7%, respectively, though the COD/TN ratio was as low as 0.84. With an over HLR of 4.0 m/(m·d) (HRT decreased to 6 h), bad performance of the UMBR was observed with an average removal of COD, NH and TN as low as 45.0%, 59.0% and 57.5%, respectively. Since the HLR was decreased to 2.4 m/(m·d) (HRT 10 h), the microaerobic process regained the efficiency in nutrient removal with a removal of COD, NH and TN averaged 59.0%, 95.3% and 87.8%, respectively. The microaerobic condition allowed anammox bacteria, ammonia-oxidizing bacteria and archaea, nitrite-oxidizing bacteria and denitrifiers to all thrive in the UMBR, resulting in the efficient synchronous removal of organic carbon and nitrogen. As the dominant approach to nitrogen removal, anaerobic ammonium oxidation (anammox) pathway contributing to the TN removal in the microaerobic process exceeded 59.5% at HLR 3.0 m/(m·d). The results demonstrated that the UMBR can remove nitrogen and carbon from swine wastewater, with a suitable HLR.
为了了解上流式微氧生物膜反应器（UMBR）在去除富含 NH 的猪粪废水（COD/TN 比小于 1.00）中的营养物质的能力，在 25°C 下，采用恒回流比 25，评估了水力停留时间（HLR）对微氧过程的影响。结果表明，HLR 的变化对 UMBR 从废水中去除营养物质的性能有显著影响。在有利的 HLR 3.0 m/(m·d)（水力停留时间（HRT）8 h）下，微氧过程中 COD、NH 和 TN 的平均去除率分别达到 59.3%、87.7%和 84.7%，尽管 COD/TN 比低至 0.84。当 HLR 超过 4.0 m/(m·d)（HRT 降低至 6 h）时，UMBR 的性能不佳，COD、NH 和 TN 的平均去除率分别低至 45.0%、59.0%和 57.5%。当 HLR 降低至 2.4 m/(m·d)（HRT 10 h）时，微氧过程恢复了对营养物质的去除效率，COD、NH 和 TN 的去除率分别平均为 59.0%、95.3%和 87.8%。微氧条件使厌氧氨氧化菌（anammox 菌）、氨氧化菌和古菌、亚硝酸盐氧化菌和反硝化菌都能在 UMBR 中生长，从而实现有机碳和氮的高效同步去除。作为氮去除的主要途径，厌氧氨氧化（anammox）途径在微氧过程中对 TN 的去除作用超过 59.5%，在 HLR 3.0 m/(m·d)时。结果表明，UMBR 可以在适当的 HLR 条件下从猪废水中去除氮和碳。
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