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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Effect of biologically mediated pH change on phosphorus removal in BNR system for piggery waste treatment
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Effect of biologically mediated pH change on phosphorus removal in BNR system for piggery waste treatment

机译：生物介导的pH变化对BNR系统在猪场废物处理中除磷的影响

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摘要

Since applicable amount of animal waste to farm land has been greatly reduced because of the nutrient overload, nitrogen and phosphorus removal from animal waste has received a great attention. This study was conducted to evaluate how phosphorus was removed during biological nutrient removal (BNR) from piggery waste using laboratory and full scale units operated at 25 to 40℃. The phosphorus removal was performed by chemical precipitation with struvite and hydroxyapatite (HAP), cellular formation, it is basically related with pH and organic and nitrogen loads resulting in influent COD/N ratios. The removal efficiencies increased from 50 to 90% as COD/N ratios increased to 6 to 7, but carbon was not limited beyond this ratio for denitrification resulting in a stable pH. Overall, about 70% of the phosphorus removal was due to the precipitates of struvite and/or HAP, and the remaining removal was due to the cellular P formation. Any significant temperature effect on phosphorus removal was not observed within the operating temperature. In order to maximize phosphorus removal in BNR system, additional anoxic stage must be furnished prior to discharge its final effluent after oxic stage.
机译：由于养分过量，可用于农田的动物粪便量大大减少，因此从动物粪便中去除氮和磷受到了广泛的关注。这项研究旨在评估在实验室温度和25至40℃下运行的全尺寸装置从猪场废物中去除生物营养素（BNR）时如何去除磷。磷的去除是通过鸟粪石和羟基磷灰石（HAP）的化学沉淀，细胞形成而完成的，这基本上与pH值以及有机和氮负荷有关，从而影响进水COD / N比率。随着COD / N比率增加到6到7，去除效率从50％上升到90％，但是对于反硝化作用，碳不受限制地超过该比率，从而获得了稳定的pH值。总体而言，约70％的磷去除是由于鸟粪石和/或HAP的沉淀，其余的去除是由于细胞中磷的形成。在工作温度范围内未观察到对除磷有任何明显的温度影响。为了最大程度地去除BNR系统中的磷，必须在氧化阶段后排放最终废水之前提供额外的缺氧阶段。

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