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Combined Phototrophic Simultaneous Nitrification-Endogenous Denitrification with Phosphorus Removal (P-SNDPR) System Treating Low Carbon to Nitrogen Ratio Wastewater for Potential Carbon Neutrality
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-01-31 , DOI: 10.1021/acs.est.3c09351 Qingan Meng 1 , Wei Zeng 1 , Jiayu Zhang 1 , Hongjun Liu 1 , Shuangshuang Li 1 , Yongzhen Peng 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-01-31 , DOI: 10.1021/acs.est.3c09351 Qingan Meng 1 , Wei Zeng 1 , Jiayu Zhang 1 , Hongjun Liu 1 , Shuangshuang Li 1 , Yongzhen Peng 1
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Conventional biological nutrient removal processes rely on external aeration and produce significant carbon dioxide (CO2) emissions. This study constructed a phototrophic simultaneous nitrification-denitrification phosphorus removal (P-SNDPR) system to treat low carbon to nitrogen (C/N) ratios wastewater and investigated the impact of sludge retention time (SRT) on nutrient removal performance, nitrogen conversion pathway, and microbial structure. Results showed that the P-SNDPR system at SRT of 15 days had the highest nutrient removal capacity, achieving over 85% and 98% removal of nitrogen and phosphorus, respectively, meanwhile maintaining minimal CO2 emissions. Nitrogen removal was mainly through assimilation at SRTs of 5 and 10 days, and nitrification-denitrification at SRTs of 15 and 20 days. Stable partial nitrification was facilitated by photoinhibition and low DO levels. Flow cytometry sorting technique results revealed SRT drove community structural changes in translational activity (BONCAT+) microbes, where BONCAT+ microbes were mainly simultaneous nitrogen and phosphorus removal bacteria (Candidatus Accumulibacter), denitrifying bacteria (Candidatus Competibacter and Plasticicumulans), ammonia-oxidizing bacteria (Nitrosomonas), and microalgae (Chlorella and Dictyosphaerium). The P-SNDPR system represents a novel, carbon-neutral process for efficient nutrient removal from low C/N ratio wastewater without aeration and external carbon source additions.
中文翻译：
光养同步硝化-内源反硝化与除磷相结合（P-SNDPR）系统处理低碳氮比废水以实现潜在的碳中和
传统的生物营养去除过程依赖于外部曝气并产生大量的二氧化碳(CO 2 )排放。本研究构建了光养同步硝化反硝化除磷（P-SNDPR）系统来处理低碳氮（C/N）比废水，并研究了污泥停留时间（SRT）对营养物去除性能、氮转化途径、和微生物结构。结果表明，P-SNDPR系统在SRT 15天时具有最高的养分去除能力，氮和磷的去除率分别超过85%和98%，同时保持最低的CO 2排放。氮去除主要通过SRT 5和10天的同化作用，以及SRT 15和20天的硝化-反硝化作用。光抑制和低溶解氧水平促进了稳定的部分硝化作用。流式细胞术分选技术结果显示，SRT驱动了翻译活性（BONCAT+）微生物群落结构的变化，其中BONCAT+微生物主要为同时脱氮除磷菌（Candidatus Accumulibacter ）、反硝化菌（Candidatus Competibacter和Plasticicumulans ）、氨氧化菌（ Nitrosomonas） ）和微藻（小球藻和网藻）。 P-SNDPR 系统代表了一种新颖的碳中和工艺，可有效去除低 C/N 比废水中的营养物，无需曝气和添加外部碳源。
更新日期：2024-01-31
中文翻译：
光养同步硝化-内源反硝化与除磷相结合（P-SNDPR）系统处理低碳氮比废水以实现潜在的碳中和
传统的生物营养去除过程依赖于外部曝气并产生大量的二氧化碳(CO 2 )排放。本研究构建了光养同步硝化反硝化除磷（P-SNDPR）系统来处理低碳氮（C/N）比废水，并研究了污泥停留时间（SRT）对营养物去除性能、氮转化途径、和微生物结构。结果表明，P-SNDPR系统在SRT 15天时具有最高的养分去除能力，氮和磷的去除率分别超过85%和98%，同时保持最低的CO 2排放。氮去除主要通过SRT 5和10天的同化作用，以及SRT 15和20天的硝化-反硝化作用。光抑制和低溶解氧水平促进了稳定的部分硝化作用。流式细胞术分选技术结果显示，SRT驱动了翻译活性（BONCAT+）微生物群落结构的变化，其中BONCAT+微生物主要为同时脱氮除磷菌（Candidatus Accumulibacter ）、反硝化菌（Candidatus Competibacter和Plasticicumulans ）、氨氧化菌（ Nitrosomonas） ）和微藻（小球藻和网藻）。 P-SNDPR 系统代表了一种新颖的碳中和工艺，可有效去除低 C/N 比废水中的营养物，无需曝气和添加外部碳源。
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