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Wu G, Yang G, Sun X, Li B, Tian Z, Niu X, Cheng J, Feng L. Simultaneous denitrification and organics removal by denitrifying bacteria inoculum in a multistage biofilm process for treating desulfuration and denitration wastewater. BIORESOURCE TECHNOLOGY 2023; 388:129757. [PMID: 37714492 DOI: 10.1016/j.biortech.2023.129757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 09/04/2023] [Accepted: 09/07/2023] [Indexed: 09/17/2023]
Abstract
This study aimed to treat real wastewater from the desulfuration and denitration process in a petrochemical plant with high-strength nitrogen (TN≈200 mg/L, > 90% nitrate), sulfate (2.7%) and extremely low-strength organics (CODCr < 30 mg/L). Heterotrophic denitrification of multistage anoxic and oxic biofilm (MAOB) process in three tanks using facultative denitrifying bacteria inoculum was developed to simultaneously achieve desirable effluent nitrogen and organics at different hydraulic retention time (HRT) and carbon to nitrogen (C/N) mass ratios. The optimum condition was recommended as a C/N ratio of 1.5 and a HRT of A (24 h)/O (12-24 h) to achieve > 90% of nitrogen and organics removal as well as no significant variation of sulfate. The denitrifying biofilm in various tanks was dominant by Hyphomicrobium (8.9%-25.7%), Methylophaga (18.6%-25.8%) and Azoarcus (3.3%-19.6%), etc., containing > 20% aerobic denitrifiers. This explained that oxic zone in MAOB process also exhibited simultaneous nitrogen and organics removal.
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Affiliation(s)
- Guiyang Wu
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China
| | - Guangfeng Yang
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China; National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, Zhoushan 316022, China
| | - Xiaoran Sun
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China
| | - Bu Li
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Zhijuan Tian
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Xinzheng Niu
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Junmei Cheng
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Lijuan Feng
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China; National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, Zhoushan 316022, China.
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Feng L, Wu G, Zhang Z, Tian Z, Li B, Cheng J, Yang G. Improving denitrification performance of biofilm technology with salt-tolerant denitrifying bacteria agent for treating high-strength nitrate and sulfate wastewater from lab-scale to pilot-scale. BIORESOURCE TECHNOLOGY 2023; 387:129696. [PMID: 37598804 DOI: 10.1016/j.biortech.2023.129696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 08/12/2023] [Accepted: 08/17/2023] [Indexed: 08/22/2023]
Abstract
This study focused on the application of salt-tolerant denitrifying bacteria (DBA) in an optimized biofilm process to treat high sulfate-nitrate wastewater from lab-scale to pilot-scale. Lab-scale results demonstrated the salinity, DBA inoculum, supplementary carbon and phosphorus source significantly varied the startup periods at the range of 36-74 d, and the optimum initial start-up conditions were as follows: >0.6 g/L of DBA, 2-4 of C/N ratio, 0.3-0.6 mg/L of phosphorus and a salinity-gradient domestication method. A pilot scale of biofilm technology with DBA was further developed for treating real wastewater from the desulfuration and denitration with both high nitrate (≈200 mg/L) and sulfate (2.7%). The denitrification efficiency reached above 90% after one-month gradient-salinity of 0.5%-2.7%. Mature biofilm had dominant genera Hyphomicrobium (31.80%-61.35%), Methylotenera (0.85%-20.21%) and Thauera (1.42%-8.40%), etc. Notably, the largest genera Hyphomicrobium covered the complete denitrification genes.
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Affiliation(s)
- Lijuan Feng
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China.
| | - Guiyang Wu
- College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316022, China
| | - Zeliang Zhang
- College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316022, China
| | - Zhijuan Tian
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Bu Li
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Junmei Cheng
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Guangfeng Yang
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China.
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Zhang Y, Zhang Y, Wei L, Li M, Zhu W, Zhu L. Spatiotemporal correlations between water quality and microbial community of typical inflow river into Taihu Lake, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:63722-63734. [PMID: 35460482 DOI: 10.1007/s11356-022-19023-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 01/29/2022] [Indexed: 06/14/2023]
Abstract
Changxing River, which is a typical inflow river into Taihu Lake and occurs severe algae invasion, is selected to study the effect of different pollution sources on the water quality and ecological system. Four types of pollution sources, including the estuary of Taihu Lake, discharge outlets of urban wastewater treatment plants, stormwater outlets, and nonpoint source agricultural drainage areas, were chosen, and next-generation sequencing and multivariate statistical analyses were used to characterize the microbial communities and reveal their relationship with water physicochemical properties. The results showed that ammonia nitrogen (NH4+-N), total nitrogen (TN), and total phosphorus (TP) were the main pollutants in Changxing River, especially at stormwater outlets. At the same time, the diversity of microbial communities was the highest in the summer, and dominant microbes included Proteobacteria (40.9%), Bacteroidetes (21.0%), and Euryarchaeota (6.1%). The results of BIOENV analysis showed that the major seasonal differences in the diversity of microbial community of Changxing river were explained by the combination of water temperature (T), air pressure (P), TP, and CODMn. From the perspective of different pollution types, relative abundances of Microcystis and Nostocaceae at the estuary of Taihu Lake were correlated positively with dissolved oxygen (DO) and pH, and relative abundances of Pseudomonas and Arcobacter were correlated positively with concentrations of TN and nitrate nitrogen (NO3--N) at stormwater outlets. This study provided a reference for the impact of pollution types on river microbial ecosystem under complex hydrological conditions and guidance for the selection of restoration techniques for polluted rivers entering the important lake.
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Affiliation(s)
- Yajie Zhang
- Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou, 310058, China
| | - Ye Zhang
- Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou, 310058, China
| | - Lecheng Wei
- Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou, 310058, China
| | - Mengyan Li
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, 07102, USA
| | - Weitang Zhu
- Environmental Protection Bureau of Changxing County, Huzhou, 313100, China
| | - Liang Zhu
- Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou, 310058, China.
- Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, 310058, China.
- Zhejiang Provincial Engineering Laboratory of Water Pollution Control, Hangzhou, 310058, China.
- Department of Environmental Engineering, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou, 310058, People's Republic of China.
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Lai C, Sun Y, Guo Y, Cai Q, Yang P. A novel integrated bio-reactor of moving bed and constructed wetland (MBCW) for domestic wastewater treatment and its microbial community diversity. ENVIRONMENTAL TECHNOLOGY 2021; 42:2653-2668. [PMID: 31902307 DOI: 10.1080/09593330.2019.1709904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 12/22/2019] [Indexed: 06/10/2023]
Abstract
An MBBR and CW combo bio-reactor (MBCW) was designed as a novel hybrid process for simultaneous organic, nitrogen and phosphate removal through the long-term operation. The effect of the internal recycling rate (IRR), hydraulic retention time (HRT) and chemical oxygen demand/total nitrogen (C/N) ratio were all discussed, and the recommended values were 5:1, 12 h and >6, respectively. A higher C/N ratio was a key factor for achieving a higher TN removal. The mixed biocarrier system was realized by inoculating porous polymer carriers (PPC) and cylindrical polyethylene carriers (CPC) and achieving a higher organic biodegradation and nitrification rate compared to a single carrier system. Microorganism activities and plants' uptake or utilization both contributed to the nutrient removal in a constructed wetland. High-throughput sequencing results revealed an abundant microbial diversity and a distinct microbial distribution in the whole system where Flavobacterium (14.2%), Acinetobacter (12.87%) and Rhodobacter (10.83%) dominated on PPC, Terrimonas (8.88%), Reyranella (6.61%) and Rubinisphaera (5.63%) dominated on CPC, Comamonas (4.18%), Gemmobacter (4.02%) and Hydrogenophaga (3.97%) dominated on CWs, as well as Citrobacter (53.13%) on suspended floc.
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Affiliation(s)
- Changmiao Lai
- College of Architecture and Environment, Sichuan University, Chengdu, People's Republic of China
| | - Yu Sun
- College of Architecture and Environment, Sichuan University, Chengdu, People's Republic of China
| | - Yong Guo
- School of Chemical Engineering, Sichuan University, Chengdu, People's Republic of China
| | - Qin Cai
- College of Architecture and Environment, Sichuan University, Chengdu, People's Republic of China
| | - Ping Yang
- College of Architecture and Environment, Sichuan University, Chengdu, People's Republic of China
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Yu H, Ye X, Feng L, Yang J, Lan Z, Ren C, Zhu W, Yang G, Zhou J. Dynamics of denitrification performance and denitrifying community under high-dose acute oxytetracycline exposure and various biorecovery strategies in polycaprolactone-supported solid-phase denitrification. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 279:111763. [PMID: 33310237 DOI: 10.1016/j.jenvman.2020.111763] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 11/08/2020] [Accepted: 11/26/2020] [Indexed: 06/12/2023]
Abstract
Solid-phase denitrification (SPD) is a promising technology for nitrate-rich water purification. This study aimed to examine the variation in denitrification performance and denitrifying community under high-dose acute oxytetracycline (OTC) exposure and various biorecovery strategies. The denitrification performance was impaired significantly after one-day OTC shock at 50 mg L-1 in a continuous-flow SPD system supported by a polycaprolactone (PCL) carrier but could rapidly recover without the addition of OTC. When 50 mg L-1 OTC stress was applied for a longer time in the batch tests, a natural recovery period of more than 20 days was required to reach more than 95% nitrate reduction. Under the same conditions, the addition of both mature biofilm-attached PCL carrier and fresh biofilm-free PCL carrier significantly shortened the recovery time for efficient nitrate reduction, mainly due to the increase in organic availability from the PCL carriers. However, the composition of the microbial community notably changed due to the effects of OTC according to high-throughput sequencing and metagenomic analysis. Genes encoding NAR and NIR were much more sensitive than those encoding NOR and NOS to OTC shock. Tetracycline resistance gene (TRG) enrichment was 15.86% higher in the biofilm that experienced short-term OTC shock than in the control biofilm in the continuous-flow SPD system.
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Affiliation(s)
- Hui Yu
- Department of Environmental Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Xin Ye
- Department of Environmental Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Lijuan Feng
- Department of Environmental Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China.
| | - Jingyi Yang
- Department of Environmental Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Zeyu Lan
- Department of Environmental Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Chengzhe Ren
- Department of Environmental Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Wenzhuo Zhu
- Department of Environmental Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Guangfeng Yang
- Department of Environmental Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Jiaheng Zhou
- College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, 310014, PR China
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Luo Y, Feng L, Jia R, Yang G, Yang Q, Mu J. Variation in microbial populations and antibiotic resistance genes in mariculture sediments in the present of the seaweed Ulva fasciata and under selective pressure of oxytetracycline. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 204:111114. [PMID: 32798752 DOI: 10.1016/j.ecoenv.2020.111114] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 07/29/2020] [Accepted: 07/31/2020] [Indexed: 06/11/2023]
Abstract
The widely distributed seaweed Ulva fasciata has nutrient absorption abilities and can be used in the bioremediation of polluted maricultural environments. This study explored microbial community and antibiotic resistance gene (ARG) variation in mariculture sediments in response to different trace levels (10, 100, and 500 μg L-1) of oxytetracycline (OTC) and the presence of Ulva fasciata. The increase in OTC level promoted nutrient (NO3_-N and PO43--P) removal mainly due to Ulva fasciata adsorption. The abundances of the Euryarchaeota and Planctomycetes phyla in sediments were positively related to the increase in OTC stress, while a negative correlation occurred for the Proteobacteria phylum via metagenomic analysis. Compared with the control system, the increase rates of total ARGs were 3.90%, 7.36% and 13.42% at the OTC levels of 10, 100 and 500 μg L-1, respectively. OTC stress mainly favoured the collateral enrichment of non-corresponding polypeptide and MLS ARGs, mainly due to the enrichment of the phyla Planctomycetes and Euryarchaeota by the synergistic effect of OTC and nutrients. The results of quantitative PCR with tetracycline resistance genes (TRGs) (tetO, tetT, tetPB, tetW and otrA) and a horizontal transfer gene (intl1) demonstrated that all of genes had much higher gene numbers in sediments after 3 months of OTC stress than in those without OTC stress, which was strongly related to the variation in the phyla Bacteroidetes, Gemmatimonadetes and Acidobacteria. The significant correlation between intl1 and the target TRGs is indicative of the important role of the horizontal transfer of integron-resistant genes in the spread of TRGs.
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Affiliation(s)
- Yuqin Luo
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, PR China
| | - Lijuan Feng
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, PR China.
| | - Rong Jia
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, PR China
| | - Guangfeng Yang
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, PR China
| | - Qiao Yang
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, PR China
| | - Jun Mu
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, PR China; School of Ecology and Environment, Hainan Tropical Ocean University, Sanya City, 572022, PR China
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Lan Z, Yang J, Feng L, Yu H, Ye X, Yang G, Gao H, Zhou J. Comparative analysis of denitrification performance, denitrifying community and functional genes to oxytetracycline exposure between single and hybrid biodegradable polymers supported solid-phase denitrification systems. Biodegradation 2020; 31:289-301. [PMID: 32920674 DOI: 10.1007/s10532-020-09910-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Accepted: 09/05/2020] [Indexed: 02/07/2023]
Abstract
Biodegradable carrier are vital for the solid-phase denitrification (SPD) systems for treating nitrate-rich water. Two solid-phase denitrification reactors were developed with both 200 g L-1 of single (polycaprolactone, PCL) (R1) and hybrid solid carbon sources (PCL/polylactic acid (PLA) /polyhydroxyalkanoates (PHA)) (R2) to examine the denitrification performance, denitrifying community and functional genes to various oxytetracycline (OTC) exposure in this study, respectively. Complete denitrification performance was achieved in the both SPD systems at low stress of OTC (1 mg L-1), but then dramatically reduced to less than 20% of nitrate reduction efficiency after one-month high OTC stress (10 mg L-1), and rapidly recovered to stable nitrate removal rates of 76.77 ± 5.48% (R1) and 40.68 ± 4.40% (R2) after the next day of no OTC stress. However, the reactor R1 with single PCL carriers acquired more efficient nitrate removal rate than that of reactor R2 at the high OTC stress and recovery phase with OTC stress, mainly due to the more organics availability from the single PCL carriers. The richness and diversity of nirK and nirS deintrifiers significantly declined at high OTC stress, and much more of those occurred in biofilm R1 with more organics availability. Besides, biofilm R1 achieved much more abundant periplasmic nitrate reductase, nitrite reductase genes and tetracycline resistance genes after high OTC stress, which explained the potential resistance to OTC and rapid recovery efficiency after no stress of OTC. Thus, the organics availability played an important role in assuring SPD system to be efficient under high OTC stress.
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Affiliation(s)
- Zeyu Lan
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Jingyi Yang
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Lijuan Feng
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China.
| | - Hui Yu
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Xin Ye
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Guangfeng Yang
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Huiming Gao
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Jiaheng Zhou
- College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China
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Performance and microbial diversity of denitrifying biofilms on polyurethane foam coupled with various solid carbon sources for nitrate-rich water purification. Int Microbiol 2020; 23:405-413. [PMID: 31898031 DOI: 10.1007/s10123-019-00114-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 09/30/2019] [Accepted: 12/10/2019] [Indexed: 10/25/2022]
Abstract
This study investigated the performance and microbial communities of denitrifying biofilms on polyurethane foam coupled with various solid carbon sources of acid- and alkali-pretreated rice straw and rice husk. Results showed that acid and alkali-pretreated rice straw both had higher TOC release rates (0.041-0.685 mg g-1 day-1) than those of rice husk (0.019-0.160 mg g-1 day-1) over a month, while acid pretreatment of rice husk and rice straw had a much higher organics release rate than that of alkali pretreatment and non-pretreatment, respectively. Acid-pretreated rice straw achieved the most efficient TN removal performance (82.06 ± 3.65%) with the lower occurrences of NH4+-N during denitrification than that of alkali-pretreated rice straw (80.05 ± 4.12%) over more than a month operation. However, alkali pretreatment of rice husk demonstrated much more significantly efficient TN removal efficiency (80.39 ± 2.1%) than did acid pretreatment (69.59 ± 13.43%). MiSeq sequencing analysis showed that the four biofilm samples attached on polyurethane foam with the addition of pretreated rice straw or rice husk had a range of 13-15 differentially abundant phylum and 81-123 differentially abundant genera in comparison with biofilm without extra solid carbon sources, and a higher TN removal efficiency demonstrated more types of differentially abundant genera.
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Xu H, Lin C, Chen W, Shen Z, Liu Z, Chen T, Wang Y, Li Y, Lu C, Luo J. Effects of pipe material on nitrogen transformation, microbial communities and functional genes in raw water transportation. WATER RESEARCH 2018; 143:188-197. [PMID: 29957407 DOI: 10.1016/j.watres.2018.06.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 06/15/2018] [Accepted: 06/17/2018] [Indexed: 06/08/2023]
Abstract
Raw water transportation pipelines are vital in an urban water supply system for transporting raw water to drinking water treatment plants. This study investigated the effects of pipe material on nitrogen transformation, microbial communities and characteristics of related function genes in paint-lined steel pipe (PLSP) and cement-lined steel pipe (CLSP) raw water model systems. We established quantitative relationships between specific functional genes and change rates of nitrogen pollutants, which were verified by field investigation on nitrogen pollutant transformations in real raw water transportation systems. The results showed that the CLSP produced higher ammonia nitrogen (NH4+-N) transformation rates and higher effluent concentrations of nitrate nitrogen (NO3--N) and dissolved organic nitrogen (DON) than the PLSP. Both pipes achieved high and stable nitrite nitrogen (NO2--N) and low total nitrogen (TN) removal efficiency. Nitrification was found to be the dominant process in both model systems, especially in the CLSP. Characteristics of microbial communities and nitrogen functional genes, which were analysed by high-throughput pyrosequencing and quantitative polymerase chain reaction (qPCR), respectively, varied between the two pipe systems. Nitrogen transformation pathways, identified by path analysis, were also different between the PLSP and CLSP due to different microbial community characteristics and synergistic effects of nitrogen functional genes. In the CLSP, (NH4+-N→NO2--N) with part denitrification, was the primary transformation pathway of ammonia nitrogen (NH4+-N), while only ammonia oxidization contributed to NH4+-N transformation in the PLSP. (NO2--N→NO3--N) was the main pathway involved in NO2--N transformation and NO3--N accumulation. The TN removal showed complex relationships with nitrification, denitrification and nitrogen fixation processes. These findings provided molecular-level insights into nitrogen pollutant transformations during the transportation of raw water through different types of pipes and technical support for the selection of raw water pipe materials. In our study area, the Taihu basin, China, PLSP was better than CLSP for distributing raw water in a short transportation distance, due to the lower effluent concentrations of DON and NO3--N and less abundance of microorganisms.
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Affiliation(s)
- Hang Xu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China.
| | - Chenshuo Lin
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China
| | - Wei Chen
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China
| | - Zhen Shen
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China
| | - Zhigang Liu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China; Ningbo Water Supply Co., Ltd, No.348 Xinhe Road, Ningbo, 315041, China
| | - Taoyuan Chen
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China
| | - Yueting Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China
| | - Yang Li
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China
| | - Chunhui Lu
- State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, China
| | - Jian Luo
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0355, USA
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Lv ZH, Wang J, Yang GF, Feng LJ, Mu J, Zhu L, Xu XY. Underestimated effects of sediments on enhanced startup performance of biofilm systems for polluted source water pretreatment. Biodegradation 2017; 29:89-103. [DOI: 10.1007/s10532-017-9815-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 12/07/2017] [Indexed: 10/18/2022]
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Feng LJ, Jia R, Sun JY, Wang J, Lv ZH, Mu J, Yang GF. Response of performance and bacterial community to oligotrophic stress in biofilm systems for raw water pretreatment. Biodegradation 2017; 28:231-244. [DOI: 10.1007/s10532-017-9792-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 04/25/2017] [Indexed: 10/19/2022]
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12
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Performance improvement of raw water pretreatment process with pre-inoculation biofilm: feasibility and limiting factors. Biodegradation 2016; 28:111-123. [DOI: 10.1007/s10532-016-9781-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 11/28/2016] [Indexed: 10/20/2022]
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13
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Yang GF, Feng LJ, Wang SF, Zhou JH, Guo CR, Xia T, Sun WX, Jiang YJ, Sun XY, Cao L, Xu XY, Zhu L. Potential risk and control strategy of biofilm pretreatment process treating raw water. BIORESOURCE TECHNOLOGY 2015; 198:456-463. [PMID: 26413896 DOI: 10.1016/j.biortech.2015.09.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Revised: 09/10/2015] [Accepted: 09/11/2015] [Indexed: 06/05/2023]
Abstract
An enhanced lab-scale biofilm pretreatment process treating raw water obtained from eutrophicated water bodies was established and started up with a novel strategy of low-level nutrients addition and effluent recirculation. Results showed that the startup strategy was useful for biofilm formation and pollutants removal, but it had the risks of increasing substrate affinity constant (Ks) and biofilm decay in treating raw water. Fortunately, the increased Ks value did not affected the NH4(+)-N removal performance via keeping the NH4(+)-N loading rate larger than 6.29 mg L(-1)d(-1). In addition, lower hydraulic retention time (HRT) favored the removal of organic matters, and the maximum TOC removal rate of 76.5 mg L(-1)d(-1) were achieved at HRT of 2h. After long-term acclimatization at oligotrophic niche, the decrease of Ks value and increase of biomass, extracellular polymeric substances, bioactivity were achieved. Finally, the stable operation of biofilm pretreatment process was realized in treating polluted raw water.
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Affiliation(s)
- Guang-Feng Yang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Li-Juan Feng
- Department of Environmental Engineering, Zhejiang Ocean University, No. 1 Haida South Road, Zhoushan 316022, China
| | - Sha-Fei Wang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Jia-Heng Zhou
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Cai-Rong Guo
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Tian Xia
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Wen-Xiong Sun
- Haining Second Waterworks Co. Ltd., Haining 314408, China
| | - Yue-Jie Jiang
- Haining Second Waterworks Co. Ltd., Haining 314408, China
| | - Xiao-Yan Sun
- Haining Second Waterworks Co. Ltd., Haining 314408, China
| | - Lian Cao
- Haining Second Waterworks Co. Ltd., Haining 314408, China
| | - Xiang-Yang Xu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China
| | - Liang Zhu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China.
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Yang GF, Feng LJ, Wang SF, Yang Q, Xu XY, Zhu L. Performance and enhanced mechanism of a novel bio-diatomite biofilm pretreatment process treating polluted raw water. BIORESOURCE TECHNOLOGY 2015; 191:271-280. [PMID: 26000837 DOI: 10.1016/j.biortech.2015.05.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 05/08/2015] [Accepted: 05/11/2015] [Indexed: 06/04/2023]
Abstract
A lab-scale novel bio-diatomite biofilm process (BDBP) was established for the polluted raw water pretreatment in this study. Results showed that a shorter startup period of BDBP system was achieved under the completely circulated operation mode, and the removal efficiencies of nitrogen and disinfection by-product precursor were effective at low hydraulic retention time of 2-4 h due to high biomass attached to the carrier and diatomite. A maximum NH4(+)-N oxidation potential predicted by modified Stover-Kincannon model was 333.3 mg L(-1) d(-1) in the BDBP system, which was 4.7 times of that in the control reactor. Results demonstrated that the present of bio-diatomite favors the accumulation of functional microbes in the oligotrophic niche, and the pollutants removal performance of this novel process was enhanced for polluted raw water pretreatment.
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Affiliation(s)
- Guang-feng Yang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Li-juan Feng
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Department of Environmental Engineering, Zhejiang Ocean University, No. 1 Haida South Road, Zhoushan 316022, China
| | - Sha-fei Wang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Qi Yang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Xiang-yang Xu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China
| | - Liang Zhu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China.
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15
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Yang GF, Feng LJ, Yang Q, Zhu L, Xu J, Xu XY. Startup pattern and performance enhancement of pilot-scale biofilm process for raw water pretreatment. BIORESOURCE TECHNOLOGY 2014; 172:22-31. [PMID: 25233473 DOI: 10.1016/j.biortech.2014.08.116] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 08/24/2014] [Accepted: 08/26/2014] [Indexed: 06/03/2023]
Abstract
The quality of raw water is getting worse in developing countries because of the inadequate treatment of municipal sewage, industrial wastewater and agricultural runoff. Aiming at the biofilm enrichment and pollutant removal, two pilot-scale biofilm reactors were built with different biological carriers. Results showed that compared with the blank carrier, the biofilm was easily enriched on the biofilm precoated carrier and less nitrite accumulation occurred. The removal efficiencies of NH4(+)-N, DOC and UV254 increased under the aeration condition, and a optimum DO level for the adequate nitrification was 1.0-2.6mgL(-1) with the suitable temperature range of 21-22°C. Study on the trihalomethane prediction model indicated that the presentence of algae increased the risk of disinfection by-products production, which could be effectively controlled via manual algae removing and light shading. In this study, the performance of biofilm pretreatment process could be enhanced under the optimized condition of DO level and biofilm carrier.
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Affiliation(s)
- Guang-Feng Yang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Li-Juan Feng
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Department of Environmental Engineering, Zhejiang Ocean University, No. 1 Haida South Road, Zhoushan 316022, China
| | - Qi Yang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Liang Zhu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China.
| | - Jian Xu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Xiang-Yang Xu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China
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