BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Jiaxin Wang,Chiqian Zhang,Ping Li,Hui Xu,Weiwu Wang,Weizhao Yin,Jinhua Wu,Zhiqiang Hu
Tetrasphaera -enhanced biological phosphorus removal ( T -EBPR) was developed by augmenting conventional EBPR (C-EBPR) with Tetrasphaera to improve phosphorus removal from anaerobic digestate of swine wastewater. At influent total phosphorus (TP) concentrations of 45–55 mg/L, T -EBPR achieved effluent TP concentration of 4.17 ± 1.02 mg/L, 54 % lower than that in C-EBPR (8.98 ± 0.76 mg/L). The enhanced phosphorous removal was presumably due to the synergistic effect of Candidatus Accumulibacter and Tetrasphaera occupying different ecological niches. Bioaugmentation with Tetrasphaera promoted the polyphosphate accumulation metabolism depending more on the glycolysis pathway, as evidenced by an increase in intracellular storage compounds of glycogen and polyhydroxyalkanoates by 0.87 and 0.34 mmol C/L, respectively. The enhanced intracellular storage capacity was coincidentally linked to the increase in phosphorus release and uptake rates by 1.23 and 1.01 times, respectively. These results suggest bioaugmentation with Tetrasphaera could be an efficient way for improved phosphorus removal from high-strength wastewater.
研究领域:
环境工程
·
微生物学
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DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Qin-Hua Xu,Yaofeng Cai,Jiajie Li,Minglin Zhou,Yanbin Xu
Anaerobic digestion technology effectively recovers energy from livestock manure but discharges digestate with high ammonia nitrogen (NH 4 + -N). NH 4 + -N in digestate can be effectively recovered by electrodialysis (ED) technology. However, the implementation of ED technology is limited by membrane and energy costs. Here, we present a capacitor-circuit-switching electrodialysis (CCSE) strategy to enhance ED efficiency by integrating an electric double-layer capacitor (EDLC). We reveal that the energy storage mechanism of EDLC improves the power density while the intermittent operation mitigates the concentration polarization effect. In the practice of the real digestate, CCSE elevated the pH to 9.4, and 98.8 % of the NH 4 + ions migrated to the cathode compartment after 3.5 h. The specific energy consumption and the current efficiency are 15 kWh/kg NH 4 + -N (N) and 64.1 %, respectively. High pH contributes to carbon reduction in the stripping process, and subsequent alkaline contamination can be controlled by neutralization of the anode effluent. Moreover, the CCSE-stripping system achieved 95 % NH 4 + -N removal and 93 % stripping recovery efficiency. This work provides valuable insights and solutions for the design and optimization of ED systems.
研究领域:
环境科学
·
能源技术
·
废水处理
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DOI
高影响因子
Journal of Cleaner Production
·
2017
·
IF 5.715
Xiaochang Lin,Zhiying Han,Hongjun Yu,Zhangying Ye,Songming Zhu,Jun Zhu
A novel, two-chamber electrolysis cell equipped with an ion exchange membrane and a magnesium anode was proposed in this study to recover phosphate as struvite from both the simulated and real biogas digestion slurry of swine wastewater. In the electrolysis experiments with the simulated slurry, the optimal pH and current density were determined to be 8.5 and 22.2 A m −2 , respectively, achieving 95% phosphate removal efficiency and 100% current efficiency. The phosphate removal rate was mainly dependent on the magnesium dissolving rate. In the electrolysis experiments with the real digestion slurry, the pH of slurry increased from 7.4 to around 8.7 after the cathode-anode sub-section electrolysis without adding chemical reagents, achieving 93% phosphate removal efficiency at 22.2 A m −2 . The phosphate removal efficiency could be kept constant in three consecutive electrolysis cycles with both the anion exchange membrane and the cation exchange membrane . The cost of the magnesium anode treatment for the real biogas digestion slurry for struvite recovery was estimated to be $81.57 kg −1 P, mainly resulting from the consumption of electricity and magnesium anode. The precipitates collected from all experiments were identified as struvite by the X-ray diffraction analysis.
研究领域:
环境科学
·
废水处理
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DOI
高影响因子
Environmental Science-Water Research & Technology
·
2025
·
IF 3.1
Kunlun Yang,Yimei Wang,Dengyang Wang,Zengshuai Zhang,Peng Gu,Xueli Ren,Hengfeng Miao
Combined with the separation and dehydration treatment of digestate from anaerobic digestion and acidification of food waste, sulfur-modified digestate biochar was facilely prepared for efficient Cr(VI) removal to realize anaerobic digestate recycling and waste control by waste. Characterization indicated the increased surface area and mesopores and the decreased aggregation degree for biochar under optimized S doping and pyrolysis temperature (900-2S@DBC), resulting in more functional groups with high reducibility (e.g., phenolic -OH, C-S-C, S species with low valency) and improved electron transfer ability. The forms transformation analysis confirmed the reduction of sulfate source via carbon under high pyrolysis temperature. Under the conditions of an initial Cr(VI) concentration of 10 mg/L, a pH of 3, and a dosage of 0.5 g/L, the removal efficiency of Cr(VI) by 900-2S@DBC approaches 100%. 900-2S@DBC showed apparent higher Cr(VI) removal performance than other biochar. Its quasi-second-order kinetic constant was tens of times than pristine biochar. Quenching and control experiments confirmed the S species with low valency played a more important role in Cr(VI) reduction than traditional carbon and oxygen based reductive groups on carbon structure. Direct surface electron reduction made more contribution than indirect solution •O2- reduction pathway, further confirming the synergistic effect between Cr(VI) sorption and reduction. Complexation, precipitation, and ion exchange processes participated in the final immobilization of Cr by 900-2S@DBC. Additionally, 900-2S@DBC exhibited excellent Cr(VI) removal capacity in real electroplating wastewater. This study offered a feasible approach for resource utilization of anaerobic digestate and deep insights for Cr(VI) removal mechanism via sulfur-modified biochar.
研究领域:
环境科学
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废弃物资源化
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污染控制
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Linjun Wu,Huan Li,Yuexi Zhou,Zhiqiang Shen,Jiane Zuo
This research evaluated the efficacy of self-sustaining alkalinity driven gas permeable membrane (SSAD-GPM) in ammonia recovery under low-rate aeration. This research initially confirmed the role of HCO 3 − and CO 3 2− in enhancing alkalinity release and ammonia conversion. It was determined that providing alkalinity through HCO 3 − necessitates the consumption of inorganic carbon (IC), and highlighting the criticality of maintaining a HCO 3 − /NH 4 + ratio exceeding 1.0 to optimize ammonia removal efficiency (>90.5 %). Alkalinity via CO 3 2− involves a two-stage hydrolysis process, consuming IC only in the second phase. Then, comparing SSAD-GPM with alkalinity addition driven GPM (AAD-GPM) for real anaerobic digestate treatment, SSAD-GPM demonstrated an initial ammonia removal efficiency of 99.1 %, which reduced to 82.8 % after 40 days of operation. In contrast, the efficiency of AAD-GPM decreased to 62.6 %. Superior anti-fouling performance of SSAD-GPM, due to aeration-induced turbulence, mitigated concentration polarization and fouling. Efficiency was restored to 98.1 % post-cleaning with tap water. Lastly, this research assessed the alkalinity consumption and cost of various ammonia removal/recovery strategies, demonstrating that SSAD-GPM can substantially lower operating costs, yielding a net profit of $0.081/kg N. These findings underscore the potential of SSAD-GPM as a cost-effective approach for treating high ammonia‑nitrogen wastewater with sufficient self-sustaining alkalinity (HCO 3 − /NH 4 + > 1.0).
研究领域:
环境科学
·
污水处理
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yanshan Wang,Yingjin Song,Ning Li,Wen Liu,Beibei Yan,Yang Yu,Lan Liang,Guanyi Chen,Li’an Hou,Shaobin Wang
Conversion of digestate into biochar-based catalysts is an effective strategy for disposal and resource utilization. The active sites on biochar correlated with reactive species formation in peroxymonosulfate (PMS) system directly. Clarifying the structure-performance relationship of digestate derived biochar in PMS system was essential for decomposition of contaminants. Herein, dairy manure digestate derived biochar (DMDB) was prepared for PMS activation and sulfamethoxazole (SMX) degradation. The higher pyrolysis temperature could promote effective sites generation. Especially, the DMDB-800 catalyst exhibited excellent performance for PMS activation, achieving 90.2% degradation of SMX within 60 min. Based on the correlation analysis between log ( k ) values and active sites, defects, graphite N and C O were identified as dominant sites for PMS activation. The 1 O 2 oxidation and surface electron transfer were critical routes for SMX degradation. Besides, the degradation pathways of SMX were proposed according to DFT calculations and intermediates determination. The cleavage of the sulfonamide bond, hydroxylation of the benzene ring and oxidation of the amino group mainly occurred during SMX degradation. Overall, this study provides deep insights into the enhanced mechanism of tunable active sites on DMDBs for PMS activation, boosting the application of digestate biochar for water treatment in advanced oxidation systems.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Mingyi Lu,Xiaoshuang Shi,Quan Feng,Xu Li,Shujuan Lian,Mengdan Zhang,Rongbo Guo
The aim of this work was to investigate the performance of a novel humic acid modified oyster shell (MOS) bulking agent on the digestate composting. MOS was prepared by immobilizing humic acid onto oyster shell using solid phase grafting method, and then applied to the composting process. Results showed more obvious degradation of lignocellulose was observed in the MOS treatment, which was probably due to the high relative abundance of Actinobacteria . Moreover, the addition of MOS could significantly preserve NH 4 + and reduce the NO 3 − generation with the decreasing abundance of ammonia-oxidizing bacteria and archaea. Besides, adding MOS reduced the N 2 O emission by 59.63% compared with the control. After composting, excitation-emission matrix fluorescence spectra demonstrated that the humification degree as well as compost maturity was enhanced with MOS added.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 60
·91155-91164
·
IF 5.19
Xiang Xiangmei,Dong Kangyu,Li Zhanjun
Microplastics (MPs) have aroused tremendous attentions because of their ability in accumulating contaminants from adjacent environment. However, their capability of concentrating hydrophobic organic contaminants might be influenced by huge amounts of coexisting natural particles (NaPs). Yet, our knowledge about the relative concentrating capability of MPs versus NaPs is still rare. Herein, the distribution behavior of several hydrophobic pollutants was studied in simplified MPs/NaPs/pollutant/water quaternary systems. We found that 1-(4-(phenylzao)phenyl)azo-2-naphthol (Sudan III) had similar distribution behavior with many hydrophobic pollutants and thus was used as a model pollutant. Polyethylene (PE) film debris derived from disposable plastic wrap was the most efficient microplastic which concentrated tens of times Sudan III than coexisting NaPs including bentonite, kaolin, sawdust, and diatomite. An enrichment coefficient of over 1000 times was observed in the case of PE film debris versus quartz sand. The concentrating capability of PE film MPs was found approximately equal to biochar particles. MPs seem to have limited contribution on the long distance transportation of hydrophobic organic pollutants. However, notably, over 70% of the adsorbed Sudan III could be released back into water within 0.5 h in the presence of 0.5% sodium oleate, which is a common amphipathic matter forming micelles in digestive fluid. Microplastics might play an important vector-like role in increasing the biological accumulation of hydrophobic pollutants via intestine digestive absorption. Due to much bigger quantity of NaPs, the relative concentrating effect of MPs to hydrophobic organic pollutants over NaPs is possibly a more reasonable reference when considering their potential ecological risk.
研究领域:
环境科学
·
毒理学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Ruihan Huang,Hongdong Song,Sen Li,Song Miao,Xiao Guan
Despite the growing identification of food-derived bioactive peptides, their health-promoting effects are often hindered by low oral bioavailability. To address this challenge, we hypothesized that structural modification of liposomes with palmitic acid (PA) could enhance gastrointestinal stability and intestinal permeation to improve peptide bioavailability. Here, we successfully prepared the PA modified liposomes through thin-film hydration technique. The results demonstrated that PA was successfully inserted into the liposome membranes, meanwhile increased liposome size (from 139 nm to 146 nm) and enhanced surface charge (from −15 mV to −18 mV). Fourier transform infrared spectroscopy and fluorescence analysis revealed that PA improved the integrity of the phospholipid bilayer through hydrogen bond and electrostatic repulsion, thereby enhancing controlled release profile of liposomes in simulated digestive fluids. Storage stability tests demonstrated that while the liposomes effectively prevented peptide degradation, PA decreased liposome stability at lower temperatures. Importantly, PA-modified liposomes significantly enhanced intestinal permeation efficiency and promoted Caco-2 cellular uptake without inducing cytotoxicity (>90 % cell viability). Overall, the liposomes with PA modification provide an effective nano platform for improving the bioavailability of bioactive peptides
研究领域:
食品科学
·
纳米医学
·
药剂学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Pu Wang,Xiaofeng Liu,Fang Liu,Wei Zhan,Yongdong Chen,Weichen Zhu,Yongqiang Wang,Qiyou Liu,Chunshuang Liu,Jun Lu,Yu Tian
Phosphorus (P) recovery is critical for sustainable resource management, given its non-renewable nature and geopolitical supply risks. This study addresses the limitations of conventional approaches for inducing vivianite crystallization in wastewater, including low yield per unit volume, limited phosphorus recovery efficiency, and low vivianite purity. To overcome these challenges, we propose a two-stage hybrid strategy that combines chemical precipitation with microbially induced recrystallization under semi-solid conditions. In the first stage, iron-based coagulation captures the majority of phosphate as amorphous Fe–P complexes. In the subsequent stage, dissimilatory iron-reducing bacteria (DIRB) facilitate the reduction of Fe(Ⅲ) and drive its recrystallization into vivianite. Compared with liquid-phase crystallization, this approach supports higher P loading, thereby improving spatial efficiency and enhancing vivianite purity. Batch experiments demonstrated that increasing the solid content consistently enhanced the vivianite fraction in the product, achieving a maximum P recovery efficiency of 97.7 % and a vivianite purity of 92.6 %, which is markedly superior to other reported crystallization methods. Microbial community analysis revealed Trichlorobacter and Geobacter are key dissimilatory Fe-reducing genera driving the recrystallization of precipitates to vivianite. Successful application to real sludge digestion liquor confirmed the method's robustness.
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产品关联
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Bo Qiu,Huijuan Jing,Shengyi Han,Shuobo Zhang,Furong Ba,Lvwan Xu,Siyuan Xie,Wang Gao,Yilun Huang,Hang Xiao,David Julian McClements,Björn Berglund,Lanjuan Li,Mingfei Yao
Faecalibacterium prausnitzii ( F. prausnitzii ) exhibits a variety of biological functions that make it suitable for use as a next-generation probiotic . However, its high sensitivity to oxygen and digestive fluids currently limits its application. Riboflavin is known to support the growth of F. prausnitzii in oxygen environments, but it is important that it is in close proximity to the probiotics. Layer-by-layer assembly can be used to form protective coatings around probiotics, which can protect them from adverse environmental conditions. Moreover, riboflavin can be conjugated to these coatings, thereby increasing its efficacy by bringing it close to probiotic surfaces. In this study, we therefore evaluated the potential of electrostatic layer-by-layer assembly to protect F. prausnitzii by coating them with riboflavin-alginate and glycol-chitosan layers. Initially, we showed that riboflavin could be successfully conjugated to alginate, with a grafting ratio of around 4.35%. Then, the layer-by-layer method was used to coat F. prausnitzii using cationic glycol chitosan and anionic riboflavin-alginate. The coating formed was found to have a thickness of approximately 18.5 nm. Encapsulation did not adversely affect the growth of F. prausnitzii , but it significantly enhanced its resistance to oxygen and digestive fluids. The encapsulated probiotic was shown to have enhanced mucoadhesive properties using an in vitro intestinal monolayer model. Furthermore, the encapsulated probiotics colonized the colons of rats for longer than nonencapsulated ones. These results show that coating F. prausnitzii with riboflavin-rich biopolymer layers improves its resistance to oxygen and digestive fluids, and enhances its mucoadhesion and colonization properties, which should enhance its potential as an orally administered probiotic.
研究领域:
微生物学
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药物递送
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功能性食品
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产品关联
DOI
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2025
·Vol. 47
·期 10
·1-13
·
IF 3.8
Fan Xiulei,Wang Shenpeng,Liu Yuhan,Zhang Shu,Wang Wenjie,Ji Wei,Yu Jiazheng,Wang Qian,Lv Bowen
The behavior of polycyclic aromatic hydrocarbons (PAHs) released from tire road wear particles (TRWPs) in human digestive fluids may pose a significant risk to human health. However, the current understanding of the release pattern and influencing factors of PAHs from TRWPs is still insufficient. In this study, the release characteristics of PAHs from UV-aging TRWPs (ATRWPs) were systematically investigated by in vitro digestive simulation experiments, release kinetic model fitting and control variable experiments. The results showed that the total amount of PAHs released from ATRWPs in simulated intestinal and gastrointestinal fluids reached 32.7 and 60.5 mg/kg, respectively, with the highest amount of Phenanthrene (22.4 mg/kg), and the Elovich and double-constant release models demonstrated that PAHs release behaviors involved non-homogeneous diffusion by multiple mechanisms. In addition, UV aging significantly contributed to the release of PAHs from TRWPs, and digestive enzymes further exacerbated this process to some extent. In addition, the release behavior of PAHs from TRWPs was similar to that of PAHs from their main constituents (Road wear particles, Tire wear particles). These results suggest that aging effects, digestive enzymes, and composition of tire road wear micro are the main factors influencing the release behavior of PAHs from TRWPs.
研究领域:
环境科学
·
毒理学
·
材料科学
·
公共卫生
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）