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Gui X, Wang Z, Li K, Li Z, Mao X, Geng J, Pan Y. Enhanced nitrogen removal in sewage treatment is achieved by using kitchen waste hydrolysate without a significant increase in nitrous oxide emissions. Sci Total Environ 2024; 906:167108. [PMID: 37777127 DOI: 10.1016/j.scitotenv.2023.167108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 08/25/2023] [Accepted: 09/13/2023] [Indexed: 10/02/2023]
Abstract
Kitchen waste hydrolysate (KWH) is an effective replacement for commonly used carbon sources such as sodium acetate (NaAc) and glucose (Glu), in wastewater treatment plants (WWTPs) to enhance the total nitrogen (TN) removal efficiency in sewage and reduce the operating cost of WWTPs. However, KWH utilization introduces complex organic matter that may lead to increased nitrous oxide (N2O) emissions, compared with that of NaAc and Glu, causing significant damage to the atmosphere. Therefore, this study aims to compare the effects of KWH, Glu, and NaAc on N2O emissions in sewage treatment. The results indicated that KWH introduction did not lead to a significant increase in N2O emissions, with a conversion rate of only 5.61 %. Compared with raw sludge, the addition of only Glu and NaAc significantly increased the abundance of the nar G gene, indicating that the readily degradable carbon sources initiated denitrification at a faster rate than KWH. When KWH was added, there was a notable increase in the abundance of genes associated with partial nitrification and denitrification (nir K, hzo, and nos Z). In contrast, Glu and NaAc did not have a significant effect on the nos Z gene. The results suggested that KWH supplementation was more effective to reduce N2O to N2. Moreover, the KWH addition significantly increased the microbial diversity in the sludge and promoted the presence of shortcut nitrification and denitrification bacteria (Comamonadaceae) and denitrification bacteria (Rhodobacteraceae), further indicating the potential of KWH for enhanced denitrification and reduced N2O emissions. Overall, to the best of our knowledge, this is the first study that demonstrated KWH, as a novel and complex organic carbon source, can be safely used in sewage treatment processes to improve the pollutant removal efficiency without causing a significant increase in N2O emissions.
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Affiliation(s)
- Xuwei Gui
- Chongqing Key Lab of Soil Multi-Scale Interfacial Process, College of Resources and Environment, Southwest University, Chongqing 400716, China
| | - Zhengjiang Wang
- Chongqing Key Lab of Soil Multi-Scale Interfacial Process, College of Resources and Environment, Southwest University, Chongqing 400716, China
| | - Kaili Li
- School of chemical engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Zhenlun Li
- Chongqing Key Lab of Soil Multi-Scale Interfacial Process, College of Resources and Environment, Southwest University, Chongqing 400716, China.
| | - Xinyu Mao
- Chongqing Key Lab of Soil Multi-Scale Interfacial Process, College of Resources and Environment, Southwest University, Chongqing 400716, China
| | - Jinzhao Geng
- Chongqing Key Lab of Soil Multi-Scale Interfacial Process, College of Resources and Environment, Southwest University, Chongqing 400716, China
| | - Yan Pan
- Chongqing Key Lab of Soil Multi-Scale Interfacial Process, College of Resources and Environment, Southwest University, Chongqing 400716, China
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Lan M, Yin Q, Wang J, Li M, Li Y, Li B. Heterotrophic nitrification-aerobic denitrification performance of a novel strain, Pseudomonas sp. B-1, isolated from membrane aerated biofilm reactor. Environ Res 2023; 214:113901. [PMID: 36592808 DOI: 10.1016/j.envres.2022.113901] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 06/28/2022] [Accepted: 07/10/2022] [Indexed: 05/12/2023]
Abstract
A heterotrophic nitrification-aerobic denitrification (HN-AD) strain isolated from membrane aerated biofilm reactor (MABR) was identified as Pseudomonas sp. B-1, which could effectively utilize multiple nitrogen sources and preferentially consume NH4-N. The maximum degradation efficiencies of NO3-N, NO2-N and NH4-N were 98.04%, 94.84% and 95.74%, respectively. The optimal incubation time, shaking speed, carbon source, pH, temperature and C/N ratio were 60 h, 180 rpm, sodium succinate, 8, 30 °C and 25, respectively. The strain preferred salinity of 1.5% and resisted heavy metals in the order of Mn2+ > Co2+ > Zn2+ > Cu2+. It can be preliminarily speculated from the results of enzyme assay that the strain removed nitrogen via full nitrification-denitrification pathway. The addition of strain into the conventional MABR significantly intensified the HN-AD performance of the reactor. The relative abundance of the functional bacteria including Flavobacterium, Pseudomonas, Paracoccus, Azoarcus and Thauera was obviously increased after the bioaugmentation. Besides, the expression of the HN-AD related genes in the biofilm was also strengthened. Thus, strain B-1 had great application potential in nitrogen removal process.
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Affiliation(s)
- Meichao Lan
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300350, China.
| | - Qingdian Yin
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300350, China
| | - Jixiao Wang
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300350, China
| | - Ming Li
- College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Yi Li
- College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Baoan Li
- College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
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Lan M, Yin Q, Wang J, Li M, Li Y, Li B. Heterotrophic nitrification-aerobic denitrification performance of a novel strain, Pseudomonas sp. B-1, isolated from membrane aerated biofilm reactor. Environ Res 2023; 220:115199. [PMID: 36592808 DOI: 10.1016/j.envres.2022.115199] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/22/2022] [Accepted: 12/30/2022] [Indexed: 06/17/2023]
Abstract
A heterotrophic nitrification-aerobic denitrification (HN-AD) strain isolated from membrane aerated biofilm reactor (MABR) was identified as Pseudomonas sp. B-1, which could effectively utilize multiple nitrogen sources and preferentially consume NH4-N. The maximum degradation efficiencies of NO3-N, NO2-N and NH4-N were 98.04%, 94.84% and 95.74%, respectively. The optimal incubation time, shaking speed, carbon source, pH, temperature and C/N ratio were 60 h, 180 rpm, sodium succinate, 8, 30 °C and 25, respectively. The strain preferred salinity of 1.5% and resisted heavy metals in the order of Mn2+ > Co2+ > Zn2+ > Cu2+. It can be preliminarily speculated from the results of enzyme assay that the strain removed nitrogen via full nitrification-denitrification pathway. The addition of strain into the conventional MABR significantly intensified the HN-AD performance of the reactor. The relative abundance of the functional bacteria including Flavobacterium, Pseudomonas, Paracoccus, Azoarcus and Thauera was obviously increased after the bioaugmentation. Besides, the expression of the HN-AD related genes in the biofilm was also strengthened. Thus, strain B-1 had great application potential in nitrogen removal process.
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Affiliation(s)
- Meichao Lan
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300350, China.
| | - Qingdian Yin
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300350, China
| | - Jixiao Wang
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300350, China
| | - Ming Li
- College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Yi Li
- College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Baoan Li
- College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
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Tao M, Kong Y, Jing Z, Jia Q, Tao Z, Li YY. Denitrification performance, bioelectricity generation and microbial response in microbial fuel cell - constructed wetland treating carbon constraint wastewater. Bioresour Technol 2022; 363:127902. [PMID: 36075346 DOI: 10.1016/j.biortech.2022.127902] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/30/2022] [Accepted: 08/31/2022] [Indexed: 06/15/2023]
Abstract
For the deep reduction of nitrogen, the microbial fuel cell-constructed wetland (MFC-CW) was conducted for treating carbon constraint wastewater. Results indicated that nitrogen removal decreased from 94.96% to 24.96% with influent COD/TN (chemical oxygen demand/total nitrogen) from 4 to 0. MFC-CW was seriously affected by low organic wastewater. Wetland plants contributed to denitrification, with TN removal increasing from 46.13% to 64.87%. The bioenergy output showed a linear relationship with influent COD, and the maximum power density of 1.17 mW/m2 was obtained. Correlation analysis indicated that functional genera of Paenibacillus, Trichococcus, norank_KD4-96, norank_OLB14 played a crucial role in nitrogen removal. Influent COD and wetland plants affected carbon and nitrogen metabolisms, and key genes related to denitrification were more abundant in the cathode. Findings illustrated the nitrogen metabolism in MFC-CW with carbon constraint wastewater and will extend the application of MFC-CW in secondary effluent treatment from wastewater treatment plants.
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Affiliation(s)
- Mengni Tao
- College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Yu Kong
- Nanjing Municipal Design and Research Institute Co., Ltd, Nanjing 210008, China
| | - Zhaoqian Jing
- College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
| | - Qiusheng Jia
- College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Zhengkai Tao
- College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Yu-You Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan
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Lv Y, Li Z, Zhou X, Cheng S, Zheng L. Stabilization of source-separated urine by heat-activated peroxydisulfate. Sci Total Environ 2020; 749:142213. [PMID: 33370919 PMCID: PMC7607252 DOI: 10.1016/j.scitotenv.2020.142213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/29/2020] [Accepted: 09/03/2020] [Indexed: 06/12/2023]
Abstract
Source-separated urine is an attractive fertilizer due to its high nutrient content, but the rapidly hydrolysis of urea leads to ammonia volatilization and other environmental problems. Urine stabilization, which meanly means preventing enzymatic urea hydrolysis, receives increasing attention. Accordingly, this study developed a technique to stabilize fresh urine by heat-activated peroxydisulfate (PDS). The effect of three crucial parameters, including temperature (55, 62.5, and 70 °C), heat-activated time (1, 2, and 3 h), and PDS concentration (10, 30, and 50 mM) that affect the activation of PDS in urine stabilization were investigated. Nitrogen in fresh urine treated with 50 mM PDS at 62.5 °C for 3 h existed mainly in the form of urea for more than 22 days at 25 °C. Moreover, the stabilized urine could remain stable and resist second contamination by continuous and slow pH decrease due to PDS decomposition during storage. Less than 8% of nitrogen loss in stabilized urine was detected during the experiment. The investigation of nitrogen transformation pathway demonstrated that urea was decomposed into NH4+ by heat-activated PDS and further oxidized to NO2- and NO3-. The nitrogen loss during treatment occurred via heat-driven ammonia volatilization and N2 emission produced by synproportionation of NO2- and NH4+ under acid and thermal conditions. Overall, this study investigated an efficient approach of urine stabilization to improve urine utilization in terms of nutrient recovery.
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Affiliation(s)
- Yaping Lv
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Zifu Li
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China.
| | - Xiaoqin Zhou
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Shikun Cheng
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Lei Zheng
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
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