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Li Y, Chen Y, Kang L, Cao Z, Lv J, Wang S, Guo C, Wang J. Metagenomic analysis reveals enhanced sludge dewaterability through acidified sludge inoculation: Regulation of Fe (II) oxidation electron transport pathway. BIORESOURCE TECHNOLOGY 2024; 412:131367. [PMID: 39216705 DOI: 10.1016/j.biortech.2024.131367] [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: 07/26/2024] [Revised: 08/20/2024] [Accepted: 08/26/2024] [Indexed: 09/04/2024]
Abstract
The bioleaching utilizing indigenous microbial inoculation can continuously improve the dewaterability of sludge. In this study, metagenomic analysis was innovative employed to identify the key microorganisms and functional genes that affect the dewatering performance of sludge in the bioleaching conditioning process. The results demonstrated that long-term repeated inoculation of acidified sludge resulted in increased abundance of many functional genes associated with the transport of carbohydrate and amino acid. Additionally, genes encoding key iron transport proteins (such as afuA, fhuC, and fhuD) and genes related to electron transfer carriers in ferrous iron oxidation process (such as rus and cyc2) were significantly enriched, thereby promoting the improvement of sludge dewatering performance through enhanced iron oxidation. Notably, Acidithiobacillus, Betaproteobacteria, and Hyphomicrobium were the major sources of functional genes. This study reveals the microscopic mechanisms underlying the improvement of sludge dewaterability through bioleaching based on mixed culture from a novel perspective of gene metabolism.
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Affiliation(s)
- Yunbei Li
- School of Environment, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, China.
| | - Yiwen Chen
- School of Environment, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, China
| | - Lizan Kang
- School of Environment, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, China
| | - Zhong Cao
- School of Environment, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, China
| | - Jinghua Lv
- School of Environment, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, China
| | - Shipeng Wang
- School of Environment, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, China
| | - Chao Guo
- Zhengzhou Moda Environmental Protection Technology Co., Ltd., Zhengzhou, China
| | - Junqiang Wang
- Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China.
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Chang Z, Su B, Zhang C, Zhang C, Song X. Effects of complex sulphur substrates on sludge bioleaching to improve heavy metal removal and microbial community diversity. CHEMOSPHERE 2023; 339:139532. [PMID: 37467854 DOI: 10.1016/j.chemosphere.2023.139532] [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: 03/27/2023] [Revised: 07/08/2023] [Accepted: 07/15/2023] [Indexed: 07/21/2023]
Abstract
In this study, H2S was used as a partial replacement nutrient substrate for sludge bioleaching. The effects of different combinations of H2S/sludge load and monomeric sulphur on heavy metal removal and microbial communities were investigated. Changes in pH, oxidation-reduction potential (ORP), SO42- concentration, heavy metal removal, and the content of heavy metal states during bioleaching were investigated, and community diversity analysis was performed. Daily introduction of H2S three times (at an interval of 8 h) at a gas flow rate of 2 ml/min and an H2S/sludge load of 15 ml/L with 5 g/L FeSO4·7H2O and 2 g/L monomeric sulphur as a nutrient substrate significantly accelerated both the bioleaching process and the pH drop in the sludge system, promoted the production of SO42-, and maintained a higher redox potential. The combination of H2S and monomeric sulphur had a significant effect on the leaching of heavy metals. Compared with the experimental group containing only H2S or monomeric sulphur, the removal rates of Zn, Ni, Pb, and Cr increased by 4.63%/13.8%, 8.5%/20.07%, 3.84%/9.5%, and 4.24%/8.02% respectively, while promoting the transformation of various heavy metal states to labile states, improving heavy metal stability, and reducing sludge ecotoxicity. High-throughput sequencing analysis showed that introducing the H2S gaseous matrix accelerated the decreasing trend of species number, bacterial abundance, and community diversity in the sludge system, promoting Proteobacteria as the dominant phylum, Acidithiobacillus, Metallibacterium, and Thiomonas as the dominant genera, and improving the bioleaching treatment effect.
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Affiliation(s)
- Zhankun Chang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China; Shanxi Municipal Engineering Postgraduate Education Innovation Centre, Taiyuan, 030024, Shanxi, China
| | - Bingqin Su
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China; Shanxi Municipal Engineering Postgraduate Education Innovation Centre, Taiyuan, 030024, Shanxi, China.
| | - Chi Zhang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
| | - Congzheng Zhang
- Shanxi Installation Group Co., Ltd, Taiyuan, 030024, Shanxi, China
| | - Xintong Song
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China; Shanxi Municipal Engineering Postgraduate Education Innovation Centre, Taiyuan, 030024, Shanxi, China
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do Nascimento LP, Gonçalves J, Duarte IC. Acidithiobacillus sp. applied to sewage sludge bioleaching: perspectives for process optimization through the establishment of optimal operational parameters. 3 Biotech 2022; 12:288. [PMID: 36276475 PMCID: PMC9492827 DOI: 10.1007/s13205-022-03354-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 09/08/2022] [Indexed: 11/01/2022] Open
Abstract
Using Acidithiobacillus sp. during bioleaching assays is a well-known biological approach to solubilizing metals within sewage sludge. However, sludge dewatering has also been reported as a secondary treatment benefit. Based on a literature review, the present work provides perspectives regarding the enhancement of bioleaching outcomes on a laboratory scale by establishing optimal operational parameters. Data from different studies suggest that greater bioleaching efficiency may be achieved using a 10% (v/v) mixed inoculum of Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans in a ratio of 4:1, supplemented with ferrous sulfate (FeSO4) and elemental sulfur (S0), and an initial system pH near 6.0. However, operational parameters must be established according to the type of sludge being treated due to differences in their compositions. Bioleaching duration is also an aspect that must be considered since treatments conducted for longer than 48 h increased the concentration of Extracellular Polymeric Substances (EPS), a characteristic associated with reducing dewaterability performance.
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Affiliation(s)
- Letícia P. do Nascimento
- Department of Biology, Laboratory of Applied Microbiology, Federal University of São Carlos (UFSCar), Rodovia João Leme dos Santos km 110, Sorocaba, 18052780 Brazil
| | - Jamile Gonçalves
- Department of Biology, Laboratory of Applied Microbiology, Federal University of São Carlos (UFSCar), Rodovia João Leme dos Santos km 110, Sorocaba, 18052780 Brazil
| | - Iolanda C. Duarte
- Department of Biology, Laboratory of Applied Microbiology, Federal University of São Carlos (UFSCar), Rodovia João Leme dos Santos km 110, Sorocaba, 18052780 Brazil
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Lu Y, Wu R, Zhang J, Liu H, Dai Y. Effects of phase separation on dewaterability promotion and heavy metal removal of sewage sludge during bioleaching. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:13971-13982. [PMID: 34599453 DOI: 10.1007/s11356-021-16630-3] [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: 05/18/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
Bioleaching is of increasing interest because of its high efficiency in improving sludge dewaterability and removing heavy metals from sewage sludge. However, in traditional single-phase bioleaching, a high-efficiency level cannot be maintained continuously, wherein the microbial synergistic effect is disrupted at a low pH environment. Therefore, in this study, a series of multi-compartment-baffled flow trials were performed to assess the effects of phase separation on sludge bioleaching by comparing a two-phase trial with two single-phase trials. Energy substrate and part of the bioleached sludge were introduced separately into two compartments to form two phases, namely selection phase and bioleaching phase. The results show that phase separation apparently shortened the start-up duration of sludge bioleaching from 7 days in a single-phase bioleaching to 4 days in two-phase bioleaching. The dewaterability of bioleached sludge was also enhanced by phase separation with relative decreases of 25.0-33.3% for specific resistance to filtration and 14.2% for capillary suction time, which was attributed to lower pH values, zeta potential closer to zero, and less dissolved organic matter in bioleached sludge after two-phase bioleaching. Phase separation generally increased the removal ratios of heavy metals during sludge bioleaching by -0.79 to 2.60%, 11.06 to 15.04%, 4.45 to 11.03%, 17.98 to 23.46%, 7.20 to 9.28%, -9.22 to -2.46%, and -6.72 to -10.68% for As, Cd, Cr, Cu, Ni, Pb, and Zn, respectively. Phase separation also enriched the Acidithiobacillus spp. and reduced the inactivation of acid-tolerant fungi, which can be conducive to better synergistic effect, and therefore maintain long-term stable state in the bioleaching phase of the two-phase bioleaching process.
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Affiliation(s)
- Yulan Lu
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, 12 Jiangan Road, Guilin, 541004, China
| | - Rongjun Wu
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, 12 Jiangan Road, Guilin, 541004, China
| | - Jun Zhang
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, 12 Jiangan Road, Guilin, 541004, China.
| | - Hongtao Liu
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Beijing, 100101, China
| | - Yu Dai
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, 12 Jiangan Road, Guilin, 541004, China
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Cai G, Ebrahimi M, Zheng G, Kaksonen AH, Morris C, O'Hara IM, Zhang Z. Effect of ferrous iron loading on dewaterability, heavy metal removal and bacterial community of digested sludge by Acidithiobacillus ferrooxidans. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 295:113114. [PMID: 34171779 DOI: 10.1016/j.jenvman.2021.113114] [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: 03/25/2021] [Revised: 05/13/2021] [Accepted: 06/16/2021] [Indexed: 06/13/2023]
Abstract
Acidithiobacillus ferrooxidans ILS-2 was adapted in digested sludge and used to treat sludge for dewaterability improvement. Results showed that increasing ferrous iron loading increased sludge dewaterability, but the inoculation of the bioleaching strain had little effect on sludge dewaterability compared to controls without the strain. The total extracellular polymeric substances (EPS) contents of sludges with and without bioleaching treatment were similar except for bioleaching treatment at 10% ferrous iron loading (on sludge total solids) where total EPS was higher with bioleaching treatment. However, bioleaching treatment for 48 h had a notable effect on removal of heavy metals, such as Mn, Ni and Zn, especially at the high loadings of ferrous iron. In the presence of A. ferrooxidans, the removal of Ni, Mn and Zn reached 93%, 88% and 80%, respectively, at a ferrous iron loading of 21%. The sequencing of 16S rRNA genes indicated that increasing ferrous iron loadings to 15% and 21% increased the relative abundance of Acidithiobacillus, Acidocella (with A. ferrooxidans) and Carboxylicivirga (without A. ferrooxidans) but decreased the abundance of Pseudomonas and Acinetobacter after 48 h treatment. This study enhanced the understanding of the correlations between bioleaching treatment of digested sludge, sludge dewaterability, heavy metal removal and bacterial communities.
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Affiliation(s)
- Guiqin Cai
- Centre for Agriculture and the Bioeconomy, Faculty of Science, Queensland University of Technology, Brisbane, QLD 4000, Australia; School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Majid Ebrahimi
- Centre for Agriculture and the Bioeconomy, Faculty of Science, Queensland University of Technology, Brisbane, QLD 4000, Australia; School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Guanyu Zheng
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China
| | - Anna H Kaksonen
- Commonwealth Scientific and Industrial Research Organisation, Land and Water, Wembley, WA 6913, Australia
| | - Christina Morris
- Commonwealth Scientific and Industrial Research Organisation, Land and Water, Wembley, WA 6913, Australia
| | - Ian M O'Hara
- Centre for Agriculture and the Bioeconomy, Faculty of Science, Queensland University of Technology, Brisbane, QLD 4000, Australia; School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia; ARC Centre of Excellence in Synthetic Biology, Queensland University of Technology, QLD 4000, Australia
| | - Zhanying Zhang
- Centre for Agriculture and the Bioeconomy, Faculty of Science, Queensland University of Technology, Brisbane, QLD 4000, Australia; School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia; ARC Centre of Excellence in Synthetic Biology, Queensland University of Technology, QLD 4000, Australia.
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Ying S, Kong X, Cai Z, Man Z, Xin Y, Liu D. Interactions and microbial variations in a biotrickling filter treating low concentrations of hydrogen sulfide and ammonia. CHEMOSPHERE 2020; 255:126931. [PMID: 32402879 DOI: 10.1016/j.chemosphere.2020.126931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 03/18/2020] [Accepted: 04/27/2020] [Indexed: 06/11/2023]
Abstract
A lab-scale biotrickling filter (BTF) packed with porcelain Rasching ring and ceramsite was applied for co-treating of low concentrations of hydrogen sulfide (H2S) and ammonia (NH3), as major pollutants typically found in e.g., intensive livestock production facilities. In this study, the outlet gas concentrations of H2S and NH3 were used for indicators if the treated gas reached odor-free condition. Overall, excellent removal efficiencies were obtained for both H2S and NH3 in the BTF during Stage I (H2S alone) and Stage II (H2S and NH3). Specifically, the H2S outlet concentration was below the detection limit (∼3.6 ppbv) and the NH3 outlet concentration was less than 0.4 ppmv when the inlet concentrations of H2S and NH3 were around 1.8 ppmv and 35.3 ppmv, respectively. In this case, the running empty bed residence time was 10.2 s. During Stage II, the outlet H2S concentration was decreased significantly when the inlet NH3 concentration was increased, likely due to the influence by pH. Meanwhile, the outlet nitrous oxide (N2O) concentration was kept low (<2% NH3) during the experiment, suggesting a proper operation of the BTF. After the inlet gas shifted from H2S alone at Stage I to H2S and NH3 at Stage II, the main sulfur-oxidizing bacteria (SOB) species in the BTF switched from Acidithiobacillus to Thiobacillus.
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Affiliation(s)
- Shihao Ying
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, China
| | - Xianwang Kong
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, China
| | - Zhen Cai
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, China
| | - Zun Man
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, China
| | - Yicong Xin
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, China
| | - Dezhao Liu
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, China.
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Huang J, Liang J, Yang X, Zhou J, Liao X, Li S, Zheng L, Sun S. Ultrasonic coupled bioleaching pretreatment for enhancing sewage sludge dewatering: Simultaneously mitigating antibiotic resistant genes and changing microbial communities. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 193:110349. [PMID: 32114241 DOI: 10.1016/j.ecoenv.2020.110349] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 02/14/2020] [Accepted: 02/15/2020] [Indexed: 06/10/2023]
Abstract
In this study, ultrasonic as a pretreatment coupled with bioleaching was used to enhance sludge dewaterability. Changes in microbial diversity and antibiotic resistant genes (ARGs) were studied during the combined treatment process. The results show that under optimal conditions, combined ultrasonic and bioleaching treatment led to decreases in the specific resistance of filtration and bioleaching time by 7.59% and 12.5%, respectively, compared with single bioleaching process. Using high pressure filtration system, the water content of sludge cake treated by the combined treatment was decreased to 58.04%, which was 10.04% lower than bioleaching sludge. After combined treatment, the microbial diversity and the total number of bacteria in the sludge decreased significantly, which caused the decreases in the absolute abundance of sulfonamide and tetracycline ARGs by 1.56-1.58 and 0.34-1.23 log units, respectively. However, the decrease in the total bacterial biomass was greater than the decrease in the number of potential hosts carrying the tetracycline ARG, resulting in an increase in the relative abundance of tetracycline gene. Furthermore, this study proposed a mechanism of the dewatering and ARGs, involving the combined ultrasonic and bioleaching treatment: Firstly, ultrasonic cavitation causes extracellular polymeric substances (EPS) to fall off the surface of sludge; Secondly, this faster and directly makes bacteria cells affected by bio-acidification and bio-oxidation. In this case, the cells could be more easily destroyed by the combined ultrasonic and bioleaching treatment, compared with individual bioleaching treatment; As a result, stronger dewaterability and more removal rates of ARGs were achieved under the combined treatment. The economic analyses showed that the combined ultrasonic and bioleaching treatment is a more practical and economical technique for achieving deep dewatering of sludge.
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Affiliation(s)
- Jinjia Huang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Jialin Liang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Xian Yang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Jiali Zhou
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Xiaojian Liao
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Shoupeng Li
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Li Zheng
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China; Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China.
| | - Shuiyu Sun
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China; Guangdong Polytechnic of Environmental Protection Engineering, Foshan, 528216, China.
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