<br>评估厌氧/缺氧/好氧系统中主流磷恢复的机会,Science of the Total Environment

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评估厌氧/缺氧/好氧系统中主流磷恢复的机会
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-11-26 , DOI: 10.1016/j.scitotenv.2023.168898
Mengqi Cheng ₁ , Congcong Zhang ₁ , Albert Guisasola ₁ , Juan Antonio Baeza ₁

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主流磷回收可以帮助废水处理厂（WWTP）有效保持良好的强化生物除磷（EBPR），同时帮助回收磷。在本研究中，中试规模的厌氧-缺氧-好氧（A2O）工艺同时运行不同操作条件下的 COD/N/P 去除和 P 回收。将好氧反应器中传统的废弃活性污泥（WAS）提取操作与厌氧反应器中的WAS提取的主流磷回收策略进行了比较。两种情况均成功去除了营养物，但厌氧 WAS 提取结果通过将厌氧反应器中的磷浓度提高了近 27%，提高了聚磷酸盐积累生物 (PAO) 的活性。对WAS发酵进行了评估，结果表明，厌氧WAS仅需3天即可达到高磷浓度，而好氧WAS发酵则需要长达7天。在发酵厌氧 WAS 场景中，发酵过程将可用于沉淀的可溶性 P 量从 24.4% 增加到 51.6%。通过对这些河流的降水模拟获得的结果表明，由于 Ca2+ 干扰以及 Mg2+ 和 NH4+ 作为限制物质，鸟粪石降水存在局限性。最佳降水方案表明，磷回收率最高可达输入磷的 51%，即鸟粪石的 90%。

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Evaluating the opportunities for mainstream P-recovery in anaerobic/anoxic/aerobic systems

Mainstream P-recovery can help wastewater treatment plants (WWTPs) to effectively maintain good enhanced biological phosphorus removal (EBPR) while helping to recover P. In this study, a pilot-scale anaerobic-anoxic-aerobic (A2O) process was operated for simultaneous COD/N/P removal and P-recovery under different operational conditions. The operation with conventional extraction of waste activated sludge (WAS) from the aerobic reactor was compared to the mainstream P-recovery strategy of WAS extraction from the anaerobic reactor. Successful nutrient removal was obtained for both scenarios, but the anaerobic WAS extraction results improved polyphosphate accumulating organisms (PAOs) activity by increasing almost 27 % P concentration in the anaerobic reactor. WAS fermentation was also evaluated, showing that anaerobic WAS required only 3 days to reach a high P concentration, while the aerobic WAS fermentation required up to 7 days. The fermentation process increased the amount of soluble P available for precipitation from 24.4 % up to 51.6 % in the fermented anaerobic WAS scenario. Results obtained by precipitation modelling of these streams showed the limitations for struvite precipitation due to Ca2+ interference and Mg2+ and NH4+ as limiting species. The optimum precipitation scenario showed that P-recovery could reach up to 51 % of the input P, being 90 % struvite.

更新日期：2023-11-26

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