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Enhanced phosphorus storage in suspended biofilm by increasing dissolved oxygen.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-11 , DOI: 10.1016/j.scitotenv.2020.137876 Hao Zhang 1 , Zhen Bi 1 , Yang Pan 2 , Yong Huang 1 , Da-Peng Li 1 , Jie Shan 1
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-11 , DOI: 10.1016/j.scitotenv.2020.137876 Hao Zhang 1 , Zhen Bi 1 , Yang Pan 2 , Yong Huang 1 , Da-Peng Li 1 , Jie Shan 1
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The phosphorus recovery efficiency in PAOs-biofilm system is so far limited to stimulating phosphorus release by adding concentrated organic carbon solution during the anaerobic stage. In present study, a PAOs-biofilm sequence batch reactor (BSBR) were operated to investigate whether increase of the phosphorus storage content via DO control can stimulate the release in the biofilm. During the operation of BSBR for 160 days, the phosphorus content in biofilm (Pbiofilm) was doubled via increasing dissolved oxygen (DO) from 4 to 6 mg/L. With the COD of 200 mg/L in the anaerobic phase, the phosphorus release was enhaced, resulting in an significant increase of phosphorus concentration from 94.85 to 179.5 mg/L in recirculated solution. Batch tests further clarified explicitly the increase of Pbiofilm stimulated a phosphorus release rate but this must be balanced since high Pbiofilm reduced the phosphorus removal capacity of the biofilm. With analysis of P31-NMR, Ortho-P and Poly-P were the main phosphorus species stored in biofilm. The microbial cell played a more important role than EPS in phosphorus storage. The dominant phylum in the master reactor was Proteobacteria with an abundance of 64.4%, in which the Rhodocyclaceae was the dominant PAOs with an abundance of 10.1%. The outcome of this study elucidated that increase of phosphorus storage via DO control which facilitated more efficient phosphorus release with much lower organic carbon source consumption during the enrichment of phosphorus. Meanwhile, we provided a new perspective for the recovery of phosphorus in future wastewater treatment plants.
中文翻译：
通过增加溶解氧来增强悬浮生物膜中的磷存储。
迄今为止，PAOs-生物膜系统中的磷回收效率仅限于在厌氧阶段通过添加浓缩有机碳溶液来刺激磷的释放。在本研究中，操作了PAOs-生物膜序列分批反应器（BSBR），以研究通过DO控制增加磷存储量是否可以刺激生物膜中的释放。在BSBR运行160天的过程中，通过将溶解氧（DO）从4 mg / L增加到6 mg / L，生物膜（Pbiofilm）中的磷含量增加了一倍。厌氧阶段的COD为200 mg / L时，磷的释放得到增强，导致再循环溶液中磷的浓度从94.85毫克/升显着增加到179.5 mg / L。批处理测试进一步明确阐明了Pbiofilm的增加刺激了磷的释放速率，但由于高Pbiofilm降低了生物膜的除磷能力，因此必须加以平衡。通过对P31-NMR的分析，Ortho-P和Poly-P是生物膜中存储的主要磷物质。在磷的储存中，微生物细胞比EPS发挥了更重要的作用。主反应器中的优势门是Proteobacteria，丰度为64.4％，其中杜鹃花科是优势的PAO，丰度为10.1％。这项研究的结果表明，通过溶解氧控制增加了磷的储存量，从而在磷富集期间促进了更有效的磷释放，而有机碳源的消耗却低得多。与此同时，
更新日期：2020-03-12
中文翻译：
通过增加溶解氧来增强悬浮生物膜中的磷存储。
迄今为止，PAOs-生物膜系统中的磷回收效率仅限于在厌氧阶段通过添加浓缩有机碳溶液来刺激磷的释放。在本研究中，操作了PAOs-生物膜序列分批反应器（BSBR），以研究通过DO控制增加磷存储量是否可以刺激生物膜中的释放。在BSBR运行160天的过程中，通过将溶解氧（DO）从4 mg / L增加到6 mg / L，生物膜（Pbiofilm）中的磷含量增加了一倍。厌氧阶段的COD为200 mg / L时，磷的释放得到增强，导致再循环溶液中磷的浓度从94.85毫克/升显着增加到179.5 mg / L。批处理测试进一步明确阐明了Pbiofilm的增加刺激了磷的释放速率，但由于高Pbiofilm降低了生物膜的除磷能力，因此必须加以平衡。通过对P31-NMR的分析，Ortho-P和Poly-P是生物膜中存储的主要磷物质。在磷的储存中，微生物细胞比EPS发挥了更重要的作用。主反应器中的优势门是Proteobacteria，丰度为64.4％，其中杜鹃花科是优势的PAO，丰度为10.1％。这项研究的结果表明，通过溶解氧控制增加了磷的储存量，从而在磷富集期间促进了更有效的磷释放，而有机碳源的消耗却低得多。与此同时，
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