Keystone Species and Niche Differentiation Promote Microbial N, P, and COD Removal in Pilot Scale Constructed Wetlands Treating Domestic Sewage,Environmental Science & Technology

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Keystone Species and Niche Differentiation Promote Microbial N, P, and COD Removal in Pilot Scale Constructed Wetlands Treating Domestic Sewage
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-09-03 , DOI: 10.1021/acs.est.1c03880
Luping Zeng _{1,

2} , Yunv Dai _{1,

2} , Xiaomeng Zhang _{1,

2} , Ying Man _{1,

2} , Yiping Tai _{1,

2} , Yang Yang _{1,

2} , Ran Tao _{1,

2}

Affiliation

The microbial characteristics related to nitrogen (N), phosphorus (P), and chemical oxygen demand (COD) removal were investigated in three pilot scale constructed wetlands (CWs). Compared to horizontal subsurface flow (HSSF) and surface flow (SF) CWs, the aerobic vertical flow (VF) CW enriched more functional bacteria carrying genes for nitrification (nxrA, amoA), denitrification (nosZ), dephosphorization (phoD), and methane oxidation (mmoX), while the removal of COD, total P, and total N increased by 33.28%, 255.28%, and 299.06%, respectively. The co-occurrence network of functional bacteria in the HSSF CW was complex, with equivalent bacterial cooperation and competition. Both the VF and SF CWs exhibited a simple functional topological structure. The VF CW reduced functional redundancy by forming niche differentiation, which filtered out keystone species that were closely related to each other, thus achieving effective sewage purification. Alternatively, bacterial niche overlap protected a single function in the SF CW. Compared with the construction type, temperature, and plants had less effect on nutrient removal in the CWs from this subtropical region. Partial least-squares path modeling (PLS–PM) suggests that high dissolved oxygen and oxidation–reduction potential promoted a diverse bacterial community and that the nonkeystone bacteria reduced external stress for functional bacteria, thereby indirectly promoting nutrient removal.

中文翻译：

基石种和生态位分化促进中试人工湿地处理生活污水中微生物N、P和COD的去除

在三个中试规模的人工湿地 (CW) 中研究了与氮 (N)、磷 (P) 和化学需氧量 (COD) 去除相关的微生物特征。与水平地下流 (HSSF) 和地表流 (SF) CW 相比，好氧垂直流 (VF) CW 富集了更多功能性细菌，它们带有硝化 ( nxrA、amoA )、反硝化 ( nosZ )、脱磷 ( phoD ) 和甲烷基因氧化 ( mmoX)，而COD、总P和总N的去除率分别增加了33.28%、255.28%和299.06%。HSSF CW 中功能细菌的共生网络是复杂的，具有等效的细菌合作和竞争。VF 和 SF CW 都表现出简单的功能拓扑结构。VF CW通过形成生态位分化来减少功能冗余，过滤掉彼此密切相关的关键物种，从而实现有效的污水净化。或者，细菌生态位重叠保护了 SF CW 中的单一功能。与建筑类型相比，温度和植物对该亚热带地区人工湿地养分去除的影响较小。

更新日期：2021-09-21

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