Influence characteristics and mechanism of organic carbon on denitrification, N 2 O emission and NO 2? accumulation in the iron [Fe(0)]- oxidizing supported autotrophic denitrification process

被引:83
作者
Deng, Shihai [1 ,2 ]
Peng, Shuai [1 ]
Xie, Binghan [3 ]
Yang, Xue [4 ]
Sun, Shaobin [1 ]
Yao, Hong [1 ]
Li, Desheng [1 ]
机构
[1] Beijing Jiaotong Univ, Sch Civil Engn, Dept Municipal & Environm Engn, Beijing 100044, Peoples R China
[2] Natl Univ Singapore, Dept Civil & Environm Engn, Ctr Water Res, 1 Engn Dr 2, Singapore 117576, Singapore
[3] Harbin Inst Technol Weihai, Sch Marine Sci & Technol, Weihai 264209, Peoples R China
[4] Natl Inst Clean & Low Carbon Energy, Proc & Engn Ctr, Beijing 102211, Peoples R China
基金
中国国家自然科学基金;
关键词
MICRO-ELECTROLYSIS; HYDROGENOTROPHIC DENITRIFICATION; SIMULTANEOUS NITRIFICATION; CONTAMINATED GROUNDWATER; NITRATE REMOVAL; PHOSPHORUS; COMMUNITY; WATER; PERFORMANCE; REDUCTASE;
D O I
10.1016/j.cej.2020.124736
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Iron [Fe(0)]-oxidizing supported autotrophic denitrification [Fe(0)-AD] is a promising process for low-carbon water treatment. Organic-carbon (OC) has been a common pollutant associated with nitrogen pollution. However, its interaction with Fe(0)-AD remains unclear. In this study, influence characteristics and mechanism of OC on Fe(0)-AD were investigated. Fe(0)-AD was established based on iron-scraps (ISs) and iron-carbon micro-electrolysis (ME) (ME-ISs-AD). The results showed that the OC-free ME-ISs-AD obtained denitrification load of 0.191 ± 0.028 kgN/(m3·d), which shifted to 0.445 ± 0.011 kgN/(m3·d) at OC-dosage of 1.0 mgCOD/mgTN. N2O (1.52 ± 0.16 mgN/L) and NO2− (6.86 ± 1.11 mgN/L) accumulated markedly in Fe(0)-AD and were reduced to 0.03 ± 0.01 mgN/L and 0.31 ± 0.20 mgN/L at OC-dosage of 1.0 mgCOD/mgTN, respectively. XRD analysis demonstrated that OC could reduce the Fe(0)-passivation, accelerating biological transformation and storage of iron-compounds, enhancing H2 (from 0.06 ± 0.01 to 0.22 ± 0.04 mg/L) and Fe2+ (from 7.4 ± 1.0 to 13.9 ± 1.5 mg/L) production. High-throughput sequencing revealed the enrichment of iron-oxidizing bacteria (e.g. Sphaerotilus and Ferriphaselus) and autotrophic denitrifiers (e.g. Hydrogenophaga and Hyphomicrobium). Real-time qPCR and enzyme activity analysis indicated that the nosZ-encoded NosZ and nirK-encoded NIR controlled N2O and NO2− accumulation in OC-dosed Fe(0)-AD, respectively. Overdose of OC (≥1.5 mgCOD/mgTN) accelerated the bio-organics-Fe complexes (BioFe) production and blocked the H2/Fe2+ transfer. NaAC was more efficient and cost-effective than Glucose and EtOH for Fe(0)-AD enhancement. The utilization of ISs under the enhancement of ME reduced the cost of Fe(0)-AD by 3.87-times comparing to the in-situ ZVI-AD process, and the dose of OC further improved the denitrification load by 1.33-times. This study provided an in-depth understanding of the influence of OC on Fe(0)-AD and could contribute to the application, optimization and secondary pollutants control of Fe(0)-AD process in low-carbon water treatment. © 2020 Elsevier B.V.
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页数:12
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