LIJia,SHISu-jie,ZHOUZhi-ming,et al.Performance and Microbial Action of Intermittent Aeration-Backwashing Constructed Wetland[J].China Water & Wastewater,2022,38(19):8-15.
间歇曝气-反冲洗人工湿地净化性能及微生物作用
- Title:
- Performance and Microbial Action of Intermittent Aeration-Backwashing Constructed Wetland
- 摘要:
-
构建了新型间歇曝气耦合气水联合反冲洗人工湿地系统（CW1），考察了该系统与传统人工湿地（CW0）的净化性能及微生物作用。结果表明，间歇曝气维持CW1床体内溶解氧浓度在0.5~3.5 mg/L，营造出厌氧/缺氧-好氧交替的微环境，在稳定运行期间CW1对COD、NH4+-N、TN和TP的平均去除率较CW0分别提高了7.2%、13.1%、8.4%和6.5%；采用水冲强度为8 L/（m2·s）、气冲强度为6 L/（m2·s）、频率为5 min/6 d的气水联合反冲洗，能够促进活性位点和基质孔隙结构的恢复，增强生物膜内外底物和代谢物的传输能力；间歇曝气-气水联合反冲洗提高了CW床体中微生物群落的丰富度和多样性，使norank_f__NS9_marine_group （3.9%）、norank_f__Saprospiraceae （3.4%）和norank_f__norank_o__Saccharimonadales （4.1%）等厌氧/缺氧和好氧功能菌同时富集，且发现参与糖类和氨基酸代谢过程的功能基因占比均超过5%，加速其介导的有机物降解及氮素去除代谢。
- Abstract:
- A novel intermittent aeration coupled air-water backwashing constructed wetland system (CW1) was constructed, and the performance and microbial action of CW1 and traditional constructed wetlands (CW0) were investigated. The results showed that intermittent aeration maintained the dissolved oxygen in CW1 bed between 0.5 mg/L and 3.5 mg/L, creating an anaerobic/anoxic-aerobic alternating microenvironment, and the average removal efficiencies of COD, NH4+-N, TN and TP by CW1 increased by 7.2%, 13.1%, 8.4% and 6.5% respectively, compared with CW0 during the stable operation period. The combined backwashing with water intensity of 8 L/(m2·s), gas intensity of 6 L/(m2·s) and frequency of 5 min/6 d promoted the recovery of active sites and substrate pore structure, and enhanced the transport capacity of nutrients/metabolites inside and outside the biofilm. Intermittent aeration coupled with water?air backwashing increased the richness and diversity of microbial communities in CW1, and simultaneously enriched anaerobic/anoxic and aerobic functional bacteria such as norank_ f__NS9_marine_group (3.9%), norank_f__Saprospiraceae (3.4%) and norank_f__norank_o__Saccharimonadales (4.1%) at genus level, and the functional genes involved in the processes of carbohydrate metabolism and amino acid metabolism accounted for more than 5% in CW1, accelerating organic matter degradation and nitrogen removal metabolism mediated by these genes.
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