SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
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IF 9.8
Min Sun,Xian-Zhang Wang,Ren-Ying Xiong,Xiangying Chen,Lin-Feng Zhai,Shaobin Wang
Utilization of sewage sludge for the fabrication of environmental functional materials is highly desirable to achieve pollution mitigation and resource recovery. In the present work, we introduced a novel MgAl-layered double oxide (LDO)@biochar composite adsorbent in-situ fabricated from Al-rich sewage sludge, and its excellent application in nanoplastics adsorption. Initially, fifteen model contaminants with varied conjugate structures, hydrogen bonding and ionic properties were selected for an investigation of adsorption behavior and adsorption selectivity on LDO@biochar. Structural variation of LDO@biochar suggested reconstruction of the layered double hydroxide (LDH) during the adsorption process due to the “memory effect”. Under the synergy of LDH and biochar, the contaminants were adsorbed via multiple adsorbent-adsorbate interactions, including anion exchange, electrostatic interaction, hydrogen bonding and π-π conjugation. Then, a quantitative structure-activity relationship (QSAR) model was constructed by integrating the number of hydrogen bond acceptors, polarity surface area, number of aromatic rings, and Fukui index f(−) x together to reflect the affinity of each contaminant to the adsorbent. Guided by the QSAR model, the negatively charged polystyrene nanoplastics with continuously conjugated aromatic rings were predicted to be effectively adsorbed on LDO@biochar. Experimental tests confirmed a great capacity of LDO@biochar towards the polystyrene nanoplastics, given the equilibrium adsorption capacity as high as 360 mg g −1 at 30–50 °C. This work not only opened up a new avenue for sustainable utilization of sewage sludge towards high-performance environmental functional materials, but also demonstrated the potential of the QSAR analysis as a rapid and accurate approach for guiding the application of an adsorbent to new emerging containments.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xuran Liu,Xianli Yang,Jingnan Yang,Yanxin Wu,Dongbo Wang
The quality and quantity of short chain fatty acids (SCFAs) production from anaerobic fermentation of sewage sludge is generally constrained by low organics solubilization and poor substrate-availability. This study provided an environmentally friendly strategy with zero valent iron (ZVI) activating sulfite pretreatment to overcome this limitation and advance the sludge anaerobic fermentation. Experimental results showed that the maximal SCFAs production and acetate proportion promoted by 5.7 and 2.75 times respectively at 500 mg S/L and the ZVI/sulfite ratio of 1.25. Mechanism analysis elucidated that the free radicals of S O 4 - · and ·OH produced from ZVI-sulfite pretreatment accelerated the disintegration of sludge-flocs and decreased the value of α-helix and ratio of α-helix/ (β-sheet + random coil) from 21.64 % and 44.23 % to 17.80 % and 38.67 %, respectively, which provided more easily- and bio- available substance for functional anaerobes. The ZVI-sulfite pretreatment enhanced the ability of functional anaerobes for SCFAs production processes as hydrolysis, acidogenesis and acetogenesis and reduced the SCFAs consumption as methanogenesis, which ultimately promoted SCFAs accumulation. Microbial community illustrated that ZVI-sulfite pretreatment enriched the relative abundance of functional anaerobes related to hydrolysis, acidogenesis and acetogenesis bioprocesses. PICRUSt analysis demonstrated that the pretreatment boosted the functional genes abundance involved in pathway of butyrate and acetate formation. Moreover, the enrichment genes of acetate formation were consistent with the increase of acetate proportion.
研究领域:
环境工程
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微生物学
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生物技术
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污水处理
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
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IF 6.9
Aniqa Ashraf,Guijian Liu,Muhammad Arif,Balal Yousaf,Pervaiz Akhtar,Audil Rashid,Humaira Gulzaman,Rabia Safeer,Muhammad Saqib Rashid,Muhammad Irtaza Sajjad Haider
The growing global proliferation of plastic waste and sewage sludge (SS) has emerged as a prominent environmental dilemma. This study assessed the efficacy of highly efficient carbon-based adsorbent materials derived from co-pyrolysis of SS and plastic waste in mitigating the concentration of ciprofloxacin (CPX) in an aqueous solution. Each formulated material included varying proportions—20% and 50%—of either polyethylene (PE) or polyethylene terephthalate (PET). Notably, composite with PET—50% exhibited a significant increase in specific surface area to 194.7 m 2 /g. Efficient adsorption of CPX up to 113.97 mg/g (qms) was reported at pH 5. Pollutant removal was recorded in 12 hours of retention time due to induced π–π interactions, electrostatic and hydrophobic surface interactions highlighting chemosorption. The alkaline pH impacted the adsorption capacity, causing a prominent decline. The SS-PET formulation exhibited a substantial increase in the number of active sites, thereby showing a strong interaction with ionized CPX molecules and yielding superior sorption efficiency by utilizing the novel combination of the material. The regenerative investigations also confirmed the high adsorption for four consistent cycles. Overall, acquiring comprehensive knowledge and practical information from this study will contribute to the effective management of CPX-contaminated wastewater and the mitigation of plastic pollution.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2018
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IF 4.005
Hua Wei,Pan Hu,Aimin Li,Hu Yang
Conditioning is essential for achieving effective sludge dewatering and easier disposal. In this study, a combined pretreatment of acidification and oxidation using potassium permanganate (KMnO 4 ) as oxidant was conducted to improve the effect of a cationic starch-based flocculant (St-WH) on the dewaterability of sewage sludge . Synergetic dewatering mechanisms by acidification, oxidation, and flocculation are discussed in detail according to the analysis of the changes in bound water content, extracellular polymeric substances (EPS) fractions and components, zeta potentials , floc size, and surface microstructures of sludge cakes in the dewatering process. Acidification and oxidation could destroy the sludge flocs, thereby causing the degradation of EPS and formation of fine particles. Original loosely and tightly bound EPS partially converted to soluble EPS, resulting in release of trapped water, which can be reflected by the significant correlation between loosely bound EPS and filter cake moisture content (FCMC) ( R s = 0.83, P < 0.05). Those fine particles, simultaneously produced, were adverse to filtration efficiency . In addition to enhancing the oxidation effect of KMnO 4 , acidification treatment could still compress the protein-like materials in soluble EPS due to protonation effect, which was positively related to specific resistance to filtration (SRF) ( R s = 0.74, P < 0.05). The following flocculation using St-WH efficiently aggregated those fine particles and restrained the released EPS to bind with free water through charge neutralization and bridging effects, thereby resulting in improved filtration performance and enhanced removal of bound water ( R s = 0.88, P < 0.01). Response surface methodology was also applied to achieve an optimal condition and evaluate the effects of various environmental factors.
研究领域:
环境工程
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水处理
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废水管理
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENT INTERNATIONAL
·
2019
·
IF 7.943
Guodi Zheng,Bao Yu,Yuewei Wang,Chuang Ma,Tongbin Chen
Triclosan (TCS) is widely used as an antibacterial disinfectant in personal care products, especially in rapidly-urbanizing countries, such as China. Almost all TCS enters wastewater treatment plants (WWTPs), but the fate of the TCS in the WWTPs is unclear. TCS may be present in sewage sludge or in effluent, and the discharge of TCS into an ecosystem can pose environmental risks. In the present study, influent, effluent, and sewage sludge were collected from four typical urban WWTPs, and the fate of TCS in the plants was investigated. The study was conducted in Zhengzhou, a city in the middle reaches of the Yellow River in China. The sewage sludge was used for aerobic composting to study the influences of different ventilation treatments on the biodegradation effects of TCS and the changes in the microbial community during the composting process. The results showed that the mean concentration of TCS in the influent of the four typical WWTPs was 397.1 ng/L. The mean level of TCS in the effluent was 8.0 ng/L. The mean concentration of TCS in the sewage sludge was 814.4 ng/g. For the four WWTPs, the percentages of TCS removal were 97.6% (Nansanhuan), 97.6% (Xinzheng), 98.8% (Wulongkou), and 97.9% (Chenyu), respectively. The sewage sludge enrichment rates for TCS ranged between 36.4% and 49%. Therefore, there is a need to focus on the environmental risks from sewage sludge. During aerobic composting, the TCS was effectively degraded under three ventilation strategies. Thus, improved ventilation could enhance the degradation rate of TCS. Moreover, TCS degradation occurred in the mesophilic period and in the early stage of the thermophilic phase period. Finally, the degradation rates of TCS in sewage sludge samples composted with low-, medium-, and high-ventilation treatments were 48.1%, 59.0%, and 59.5%, respectively. Thus, high ventilation could provide enough oxygen for the pile and enhanced microorganism activity, benefiting the degradation of TCS. In addition, the microbial communities change during the composting process, and a diversity index of the changes can help explain the composting process.
研究领域:
环境科学
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微生物学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2017
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IF 6.065
Siyang Li,Jinxi Feng,Shuanghong Tian,Shenyu Lan,Chao Fan,Xiaosheng Liu,Ya Xiong
For the first time, paint sludge waste (PS) was used as a pore forming agent in the preparation of sewage sludge derived carbon (SC). The tuning role and mechanism of PS for characteristics of SC were explored. It was found that a sludge carbon (SC PS-Zn ) with rich macro-, meso- and micro- porous could be produced by one-step pyrolytic process of sludge in the presence of PS and ZnCl 2. Its surface area could reach as high as 680.5 m 2 g −1 as 88.4 times and 4.8 times of sludge carbon without addition of PS and ZnCl 2 (SC) and only addition of ZnCl 2 (SC Zn ) , respectively. The macro- pores fabricated by PS provided much inner-space for ZnCl 2 to generate meso- and micro- porous, leading to a hierarchical porous structure. SC PS-Zn showed a high adsorption capacity of 685.4 mg g −1 for Chrysophenine, which is 1.3 and 1.7 times that of SC PS and SC Zn respectively. The adsorption difference could be simply attributed to the fact that the great molecules were difficult to enter micro- pores of SC Zn . It was also found that the difference was also dependent on orientation of Chrysophenine, which was related to pH value of solution.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Chenyu Wang,Xiaolong Ling,Weibo Sun,Xiaohui Sun,Chao He
Sewage sludge (SS)-derived hydrochar by hydrothermal carbonization (HTC) have demonstrated its potential as an adsorbent. This study investigated the effect of HTC parameters and feedstock components on the adsorption performance of hydrochar, with the aim of enhancing its adsorption performance without modification, thereby expanding applications of waste-derived adsorbent under cost constraints. Water, ash and five model compounds were used to adjust the typical components of SS, then hydrochar was prepared under various HTC parameters. The adsorption quantity of the model pollutants (tetracycline and methylene blue) on hydrochar decreased with an increase in HTC temperature, and there was a minor decrease with prolonged reaction times. Changes in the HTC parameters did not affect the adsorption mechanism of the hydrochar. Notably, humus and lignin emerged as key components affecting the adsorption performance of hydrochars. Compared with the blank control, the adsorption capacities of tetracycline and methylene blue by hydrochar after the addition of 30 wt% humic acid increased by 16.1% and 101.0%, respectively. Moreover, the adsorption capacity of methylene blue increased by 58.5% after adding 30 wt% alkali lignin. The underlying mechanism was elucidated based on hydrochar characterization. Changes in HTC parameters affected the properties of hydrochar and its adsorption performance. The effect of component adjustment on the adsorption performance of hydrochar was attributed to abundance of oxygen-containing functional groups formed by the model compounds during hydrolysis. Component adjustment facilitated the binding of groups to the hydrochar, thereby offering more adsorption sites. This study provides a valuable reference for utilizing SS in the preparation of efficient and low-cost adsorbents.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jishao Jiang,Zhuyu Tang,Kai Liu,Shipeng Wang,Yunbei Li,Jinghua Lv,Xu Yan,Dong Liu,Parag Bhople,Ke Cheng
Laccase plays a crucial role in eliminating pharmaceuticals and personal care products (PPCPs) in different ecological system, but it could be easily decomposed or inactivated under high temperature and pH conditions during the composting process. In this work, three treatments, including Control, LAC-0 and LAC-8 (the two-stage laccase application on day 0 and 8), were investigated the effects of two-stage laccase application on the typical PPCPs degradations, also the laccase activity and the successions of bacterial community. Results revealed that two-stage laccase application significantly increased the NO 3 -N contents by 12.6 % and the TN content by 28.0 %, respectively. Meanwhile, the two-stage laccase application significantly increased the TOC degradation, and the enzymatic activities of laccase, cellulase, and urease, especially during the cooling and mature stages. In addition, the degradation rate of carbamazepine for LAC-0 and LAC-8 treatments increased by 44.7 % and 54.5 %, and ibuprofen by 64.5 % and 71.1 % relative to control, respectively. Microbial correlation analysis showed that the two-stage laccase application (LAC-8) facilitated the mutualistic relationship among the bacteria communities, and increased the negative correlations between the bacterial communities and PPCPs degradations. Furthermore, the partial least squares path model indicated that bacterial community played a directly role in the PPCPs degradation, and environmental factors and enzyme activities had an indirectly roles.
研究领域:
环境科学
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生物技术
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微生物学
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生态毒理学
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废弃物管理
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Junmiao Yu,Xiaoxia Yang,Changkai Wang,Mingxia Huang,Butera Hassan,Zhihong Yang,Xizhu Yang,Bin Huang,Xuejun Pan
This paper integrated alkai-dried sewage sludge (SS) using calcium oxide (CaO) and bagasse (BA) with a two-stage sorption-enhanced steam gasification (SESG) process to separately generate high-purity H 2 and CO at different temperature regions, while exploring optimal conditions and coupling mechanism. Response surface experiment revealed that SS and BA exerted opposing effects on H 2 and CO production, highlighting the importance of balancing their mass ratio. Increasing CaO dosage and H 2 and CO-generation stages temperatures enhanced H 2 and CO production. The optimal conditions were identified as a CaO dosage of 1.2, with temperatures of 600 °C and 750 °C for H 2 and CO-generation stages, considering cost and energy efficiency. With the optimal CaO and BA dosage, the moisture of SS reduced from 80 % to below 40 % within 3h, enabling low-energy dewatering. During H 2 -generation stage (600 °C), residual moisture and Ca(OH) 2 in the dried SS generated in-situ steam promoting steam reforming reactions, and Ca(OH) 2 has more CO 2 sorption capacity than CaO and catalytic effect of cyclization and dehydrogenation of generated tar, to boost H 2 production. During CO-generation stage (750 °C), CaCO 3 released CO 2 to gasify char, improving CO production. The process produced 113.5 mL/g dry biomass of H 2 with 74.1 vol% purity during H 2 -generation stage and 113.3 mL/g dry biomass of CO with 59.8 vol% purity during CO-generation stage. This paper proposed a new approach for drying and resource utilization of SS for inherently separated generation of high-purity H 2 and CO, providing a more sustainable and resource-efficient process.
研究领域:
能源工程
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环境工程
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化学工程
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Chaoyue Wu,Zehua Zhao,Jun Zhong,Yang Lv,Xiaofei Yan,Yingying Wu,Houhu Zhang
In this study, the adsorption performance and behavior for dyes by hydrochar derived from sewage sludge (SS) and lignin-containing waste (garden waste, GW) were investigated. The results indicated that the adsorption capacity for methylene blue (MB) increased as the proportion of GW increased, reaching up to 52.39 mg/g under the mixing ratio of GW and SS 5:5 (5GW:5SS-HC), which represented an enhancement of 22.64 % compared with no addition of GW. The adsorption of 5GW:5SS-HC for MB was significantly influenced by the environmental pH, with enhanced adsorption observed in alkaline conditions due to strengthened electrostatic interactions. Adsorption kinetics and thermodynamics indicated that the adsorption for MB occurred on a heterogeneous surface and was primarily a chemical adsorption process. While the addition of GW did not significantly alter the specific surface area or pore structure of the hydrochar, it increased the presence of hydroxyl and other oxygen-containing functional groups, as well as aromatic ring structures. It strengthened the hydrogen bonding and π-π interactions thereby facilitating the adsorption of MB on the surface of hydrochar. Therefore, co-hydrothermal carbonization of GW and SS can produce hydrochar with excellent adsorption performance for MB, providing a novel technological approach for the resource utilization of SS and new insights into the role of lignin component in promoting the adsorption of hydrochars.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123788
·
IF 7.5
Mingtao Hu,Huiwen Wu,Wenyi Deng,Lingyu Tai,Xuerong Zheng,Weihao Li,Yaxin Su,Run Xu
Catalytic tar reforming is a pivotal technology for upgrading syngas quality during sewage sludge gasification. In this study, a series of Ni-modified carbon-based catalysts (x%NiFe/C) were synthesized using MIL-100(Fe) as a precursor to investigate the impact of Ni-loading on the catalytic performance for tar reforming. Detailed characterizations, including XRD, XPS, Raman, and NH 3 -TPD, revealed that the introduction of Ni species significantly tailored the physicochemical properties of the catalysts. Specifically, the 3.3%NiFe/C catalyst exhibited the optimal specific surface area and pore structure, facilitating efficient mass transfer. Characterization results confirmed the formation of Ni-Fe alloy, which not only modulated the surface electronic density to optimize acidity but also enhanced the dispersion of active sites. The interaction between Ni and Fe species effectively promoted the cleavage of C-C and C-H bonds in tar molecules while suppressing carbon deposition. Consequently, the 3.3%NiFe/C catalyst demonstrated superior catalytic activity and stability in the two-stage microwave-assisted gasification reforming process, achieving a syngas yield of 555 mg/g·SS, a tar conversion rate of 82.9%, and an H 2 concentration of 73.8 vol%. After ten cycles, the H 2 yield and concentration remained as high as 28.0 mmol/g·SS and 68.2 vol%, respectively. This work provides mechanistic insights into the design of MOF-derived carbon-supported catalysts for efficient SS gasification.
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 57
·86651-86664
·
IF 5.19
Li Caidan,Wang Jing,Jiang Yue,Bai Yilin,Cheng Liu
Pollution of municipal sewage sludge with heavy metals (HMs) inevitably causes secondary contamination, threatening ecosystems and human health. Dissolved organic matters (DOM) would serve as HMs carriers or ligands, directly influencing the transport and distribution. So it is of essential importance to simultaneously evaluate the release characteristics of HMs and DOM from MSS. In this paper, we investigated leaching characteristics of HMs (Cd, Cr, Cu, Zn, Ni, and Mn) and DOM from raw sewage sludge (RSS) and lime-conditioned sewage sludge (LCSS) under simulated rain with different acidities (pH 6.5 and 2.9) via column leaching experiments. The results showed the release of HMs could be divided into two distinct stages, a rapid decreasing changes in the early stage and a slow and steady change in the later stages with a slight increase in the middle of time. At the early stage, DOM was dominated by protein-like components (tryptophan-like, tyrosine-like). As time passed, protein-like components decreased while humic-like components (fulvic acid and humic acid) increased gradually. Protein-like components showed significant positive correlations with HMs, while humic acid-like components showed strong negative correlations with them. Moreover, the leaching efficiencies of Cd, Zn and Mn at pH 2.9 was about 1.5 times higher than that at 6.5, and the fluorescence intensity of humic-like components at pH 2.9 was higher than that at pH 6.5, suggesting that acid rain accelerated the release of HMs and the humification of DOM. Compared with the RSS, the DOM of LCSS showed noticeable differences, especially an obvious increase of the fulvic acid component. And the leaching efficiencies of Cd, Cr, Cu, Ni, and Mn in LCSS were much lower than that in RSS, indicating lime treatment retarded the release of HMs. Thus, our findings will be a guide to the treatment of HMs contaminants in MSS.
研究领域:
环境科学
·
环境工程
·
土壤污染
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水体生态毒理学
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固废处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）