The cotreatment of old landfill leachate and domestic sewage in rural areas by deep subsurface wastewater infiltration system (SWIS): Performance and bacterial community

被引：36

作者：

Chen, Fengming ^{[1
,2
]}

Li, Guowen ^{[2
]}

Li, Xiaoguang ^{[2
]}

Wang, Hongqiang ^{[1
]}

Wu, Huabin ^{[3
]}

Li, Jiaxi ^{[2
]}

Li, Caole ^{[2
]}

Li, Wei ^{[2
]}

Zhang, Lieyu ^{[4
]}

Xi, Beidou ^{[2
]}

机构：

[1] Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Peoples R China

[2] Chinese Res Inst Environm Sci, State Environm Protect Key Lab Simulat & Control, Beijing 100012, Peoples R China

[3] Chengdu Environm Sci Soc, Chengdu 610000, Peoples R China

[4] Chinese Res Inst Environm Sci, Basin Res Ctr Water Pollut Control, Beijing 100012, Peoples R China

来源：

ENVIRONMENTAL POLLUTION | 2021年 / 274卷 / 274期

基金：

中国国家自然科学基金;

关键词：

Deep subsurface wastewater infiltration system; Nitrogen variation; Refractory organics transformation; Denitrification; Bacterial community;

D O I：

10.1016/j.envpol.2020.115800

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this work, two deep subsurface wastewater infiltration systems (SWISs) were constructed and fed with domestic sewage (control system, S1) and mixed wastewater consisting of old landfill leachate and domestic sewage (experimental system, S2). S1 and S2 exhibited favorable removal efficiencies, with TP (98.8%, 98.7%), COD (87.6%, 86.9%), NH4+-N (99.8%, 99.9%) and TN (99.2%, 98.9%). Even when increasing the pollutant load in S2 by adding old landfill leachate, the almost complete removal performance could be maintained in terms of low effluent concentrations and even increased in terms of load removal capabilities, which included COD (19.4, 25.9 g.m(-2).d(-1)), NH4+-N (8.2, 19.9 g.m(-2).d(-1)), TN (8.9, 20.6 g.m(-2).d(-1)). To investigate the transformation of dissolved organic matter along depth, Three-Dimensional Excitation Emission Matrix fluorescence spectroscopy combined with Fluorescence Regional Integration analysis was applied. The results showed that P-I,P- n and P-II,P- n (the proportions of biodegradable fractions) increased gradually from 6.59% to 21.8% at S2_20 to 10.8% and 27.7% at S2_110, but P-III,P- n and P-nu,P- n (the proportions of refractory organics) declined from 23.1% to 27.8% at S2_20 to 21.1% and 16.4% at S2_110, respectively. In addition, high-throughput sequencing technology was employed to observe the bacterial community at different depths, and the predicted functional potential of the bacterial community was analyzed by PICRUSt. The results showed that the genera Flavobacterium, Pseudomonas, Vogesella, Acinetobacter and Aquabacterium might be responsible for refractory organic degradation and that their products might serve as the carbon source for denitrifiers to achieve simultaneous nitrate and refractory organic removal. PICRUSt further demonstrated that there was a mutual response between refractory organic degradation and denitrification. Overall, the combined treatment of domestic sewage and old leachate in rural areas by SWIS is a promising approach to achieve comprehensive treatment. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：10

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