CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Siqi Tong,Dan Chen,Xinbai Jiang,Zhixiang Xu,Xiaodong Liu,Jinyou Shen
A novel composite biochar synthesized from Fenton sludge (FS) and sewage sludge (SS) was employed to catalyze persulfate for the removal of 1-H-1,2,4-triazole (TZ). The optimized conditions for the synthesis and operating process were identified through response surface methodology as follow: SS/FS mass ratio = 5:1, catalyst dosage = 0.9 g L −1 and PDS concentration = 0.5 g L −1 . The removal efficiencies of TZ, TOC and organic nitrogen were found to be as high as 97.6%, 80.33% and 100%, respectively, with the addition of Fe 3 O 4 -doped biochar in persulfate catalytic system. Besides, Fe 3 O 4 -doped biochar exhibited superior stability and tolerance to wide range of pH (2–12), temperature (15–45 °C) and co-existing substrate. The reactive oxygen species, which resulted in the catalytic degradation of TZ followed the order of SO 4 ∙− > ∙OH > O 2 ∙− > 1 O 2 , were identified by electron spin resonance and quenching tests. It demonstrated that the radical pathway accomplished with non-radical pathway contributed to the enhanced degradation of TZ, which was further identified by electrochemical experiments. Moreover, the possible degradation pathway of TZ was ascertained and proposed through DFT calculation and LC-MS analysis. These findings illustrated that the novel magnetic biochar would be a promising persulfate catalyst for the treatment of refractory organic matters. In addition, it also provided a new alternative method for the resource utilization of FS and SS.
研究领域:
环境科学
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化学工程
·
废水处理
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DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Jishao Jiang,Rui Hou,Huilin Cui,Dong Liu,Guangxuan Yan,Yujuan Fan,Ke Cheng,Zhiguo Cao
New pollutants, pharmaceuticals and personal care products (PPCPs), accumulate in sewage sludge (SS) in wastewater treatment plants (WWTPs), posing risks to the environment and to human health. In the present study, the fates of typical PPCPs, carbamazepine (CBZ), triclosan (TCS), ibuprofen (IBU) and galaxolide (HHCB), were examined during WW treatment. Additionally, SS collected from a WWTP was used for aerobic composting to investigate the influences of micron-sized Fe 3 O 4 (M-Fe) and nano-sized Fe 3 O 4 (N–Fe) on the degradation of these PPCPs and the succession of microbial communities during the composting process. The results showed that the mean concentrations of CBZ, TCS, IBU and HHCB in the influent of the WWTP were 926.5, 174.4, 8869, and 967.3 ng/g, respectively, and in the effluent were 107.6, 47.0, 283.4, and 88.4 ng/g, respectively. The removal rate averaged ∼80%, while the enrichment rates of the PPCPs in SS ranged from 37.2% to 60.5%. M-Fe and N–Fe reduced NH 3 emissions by 32.9% and 54.1% and N 2 O emissions by 26.2% and 50.8%, respectively. Moreover, the addition of M-Fe and N–Fe effectively increased PPCP degradation rates 1.12–1.66-fold. During the whole process, the additions of M-Fe and N–Fe significantly shifted microbial community structure, and the abundances of Proteobacteria, Chloroflexi, and Actinobacteria were increased during the thermophilic stage, marking them as key PPCP-degrading phyla. Taken together, our results indicated that the addition of M-Fe and N–Fe is an effective method for improving the quality of end compost and accelerating the degradation of PPCPs.
研究领域:
环境科学
·
微生物学
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废物管理
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Xiang Shao,Jun Zhong,Dong Xu,Xiaoyuan Ren,Han Zhou,Chenyu Wang
The utilization of solid waste to prepare biochar for pollutant adsorption has emerged as a promising strategy. This study innovatively engineered magnetic biochar (S 1 I 3 -HC 240 and S 3 I 1 -PC 800 ) via hydrothermal carbonization (HTC) and pyrolysis approaches using sewage sludge and iron tailings (IT) as dual precursors, and investigated their adsorption behaviors and underlying mechanisms for methylene blue (MB) removal. The incorporation of IT enhanced MB adsorption, achieving maximum adsorption capacities of 91.17 mg/g (S 1 I 3 -HC 240 ) and 82.30 mg/g (S 3 I 1 -PC 800 ), respectively. The adsorption processes followed the Elovich kinetic model and the Freundlich isotherm, indicating spontaneous and endothermic reactions dominated by chemosorption. The primary mechanisms involved in MB removal included electrostatic attraction, π-π interactions, hydrogen bonding, and surface complexation. Notably, HTC processing with IT promoted formation of oxygenic group and Fe 3 O 4 , strengthening hydrogen bonding and surface complexation. Conversely, in pyrolysis, IT enhanced electrostatic attraction and oxidative degradation by increasing nitrogen functional groups and generating Fe 0 . From both an energy consumption and adsorption performance perspective, the energy-efficient HTC technique offers a significant advantage for the preparation of magnetic biochar from solid waste, making it a promising approach for sludge resource utilization.
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DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2020
·
IF 8.086
Wei Ma,Fanling Meng,Dong Qiu,Yuanyuan Tang
The release and migration of heavy metals from the industrial sludge has become one of the most serious environmental threats, which is urgently required to be relieved. Heavy metals can be stabilized by using ceramic precursors, via interactions with aluminum (Al), silicon (Si) and iron (Fe) as the major components. The sewage sludge incineration ash (SSA) can be recognized as a type of ceramic raw materials due to the abundant content of Al, Si and Fe, which make it possible to be beneficially used for heavy metal stabilization. This study investigated the stabilization of lead (Pb), zinc (Zn), and copper (Cu) after ceramic sintering with the SSA as ceramic precursors, and further explored the influences of heavy metal types and contents on phase transformation and immobilization effect. Results show that the heavy metals could achieve co-stabilization by the SSA in reaction series with different metal types and contents (Pb-Zn and Pb-Cu). Pb tends to combine with Al, Si and P to form PbAl 2 Si 2 O 8 and Pb 3 (PO 4 ) 3 , while Zn was finally incorporated into a spinel solid solution (ZnFe x Al 2-x O 4 ). Meanwhile, Cu is more likely to combine with Fe with the generation of CuFe 2 O 4 which will be transformed to CuFeO 2 with elevated temperatures. In both Pb-Zn and Pb-Cu series, the Zn and Cu were distributed in crystal grains while Pb was in regions around the grains. Moreover, the leachability of Pb, Zn and Cu can be substantially decreased with the eventual incorporation of the heavy metals into different product phases by the SSA. Therefore, through this study the coimmobilization of heavy metals in the simulated industrial waste can be realized by the utilization of sewage sludge incineration ash as ceramic precursors.
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
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Jishao Jiang,Rui Hou,Huilin Cui,Zhuyu Tang,Yousif Abdelrahman Yousif Abdellah,Caspar C.C. Chater,Ke Cheng,Fuqiang Yu,Dong Liu
This study surveyed the fates of artificial sweeteners in influent, effluent, and sewage sludge (SS) in wastewater treatment plant, and investigated the effects of Micro-Kaolin (Micro-KL) and Nano-Kaolin (Nano-KL) on nitrogen transformation and sucralose (SUC) and acesulfame (ACE) degradation during SS composting. Results showed the cumulative rate of ACE and SUC in SS was ∼76 %. During SS composting, kaolin reduced NH 3 emissions by 30.2–45.38 %, and N 2 O emissions by 38.4–38.9 %, while the Micro-KL and Nano-KL reduced nitrogen losses by 14.8 % and 12.5 %, respectively. Meanwhile, Micro-KL and Nano-KL increased ACE degradation by 76.8 % and 84.2 %, and SUC degradation by 75.3 % and 77.7 %, and significantly shifted microbial community structure. Furthermore, kaolin caused a positive association between Actinobacteria and sweetener degradation. Taken together, kaolin effectively inhibited nitrogen loss and promoted the degradation of ACE and SUC during the SS composting, which is of great significance for the removal of emerging organic pollutants in SS.
研究领域:
环境工程
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废物管理
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微生物学
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DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Weihao Zhu,Lian Zhang,Peicong Li,Wei Fang,Panyue Zhang
Sewage sludge treatment remains a critical environmental challenge due to its high moisture content and heavy metal contamination. The Fe 2+ /Ca(ClO) 2 /tannic acid (TA) combined conditioning has shown great performances on sludge dewatering, but its influence on heavy metal removal and risk assessment was unclear. In this study the speciation transformation of heavy metals and related mechanisms were comprehensively investigated. The results demonstrated that the sludge conditioning simultaneously enhanced sludge dewatering and promoted heavy metal removal under optimized conditions. Notably, Zn, Cd, and Ni were effectively removed from the sludge solid phase, with removal efficiencies of 39.12 %, 52.49 %, and 30.86 %, respectively. Moreover, the conditioning significantly reduced the ecological risk posed by heavy metals, as indicated by a marked decrease in comprehensive risk index from high to medium levels. The mechanisms involved in the combined effects of oxidation, acidification, and ion binding. Oxidation disrupted extracellular polymeric substance structure, while acidification increased surface positivity, enhancing heavy metal desorption. The Fe 2+ /Ca 2+ competed with heavy metals for binding sites. Additionally, pH reduction and TA chelation further facilitated the transfer of heavy metals into the liquid phase. As a result, the potential mobility index for heavy metals Zn, Cd, Ni, Hg, and As decreased by 33.93 %, 35.98 %, 21.40 %, 26.76 %, and 50.57 %, respectively. This study provides a promising strategy for the safe and resource-efficient utilization of sewage sludge.
研究领域:
环境科学
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化学工程
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废弃物管理
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环境毒理学
·
水处理
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Zhen Li,Miao Gong,Mengqi Wang,Aixin Feng,Linlu Wang,Peiyong Ma,Shoujun Yuan
Hydrogen has attracted significant attention as a clean energy source. Supercritical water gasification (SCWG) technology can produce hydrogen-rich gas while also disposing of sludge. The hydrogen yield from the SCWG of sludge is greatly increased when catalyzed by AlCl 3 . In this paper, a combined catalyst based on AlCl 3 was proposed to further increase the hydrogen yield of SCWG of dewatered sewage sludge (DSS). Analysis of the products from catalytic gasified of DSS and its model compounds were used to propose a catalytic mechanism and reaction pathway of the catalytic SCWG of DSS. Among the combined catalysts used for the SCWG of DSS, 10 wt% AlCl 3 –H 2 O 2 (mass ratio 8:2) had the best hydrogen production effect, and the hydrogen yield reached 8.88 mol/kg organic matter. This was 14% higher than when catalyzed by 10 wt% AlCl 3 . During catalysis with AlCl 3 , Al 3+ reacted with OH − in water and precipitated as Al(OH) 3 , which produced an acidic environment in the liquid product. Al(OH) 3 dehydrated to form an AlO(OH) and deposited in the solid product. A small amount of H 2 O 2 promoted the steam reforming reaction of organic matter in DSS, which increased the hydrogen yield. H 2 O 2 further promoted the hydrogen yield in an acidic environment. The catalytic effect of AlCl 3 was unaffected by H 2 O 2 . The H + generated by AlCl 3 during catalysis promoted H 2 O 2 to further depolymerized organic matter (such as humic substances) in DSS, so that AlCl 3 –H 2 O 2 catalyzed the SCWG of DSS to further increase the hydrogen yield. The order of hydrogen yield catalyzed by AlCl 3 –H 2 O 2 was guaiacol > humic acid > glycerol > alanine > glucose. Compared with AlCl 3 , AlCl 3 –H 2 O 2 reduced the hydrogen yield of glucose by nearly 20% and increased the hydrogen yield of humic acid by about 17% (25.81 mol/kg feed).
研究领域:
环境科学
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能源工程
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Zhou Chen,Yanzeng Li,Yanyan Peng,Chengsong Ye,Shenghua Zhang
This study aimed to investigate the effects of antibiotics on environmental factors, hydrolase activity, and microbial community during aerobic co-composting of food waste and sewage sludge. The results showed that 5 mg/kg of antibiotics decreased cellulase activity and increased lipase and proteinase activity, while 20 mg/kg of antibiotics also decreased cellulase activity and increased the contents of Zn, Cu, and Hg. The dominant bacterial genera of the four treatment groups were Enterococcus, Pseudomonas, Idiomarina, Lactobacillus, and Bacillus. The addition of antibiotics affected the succession of microbial community structure. Microbial communities treated with 5 mg/kg antibiotics had the highest in diversity, while those treated with 20 mg/kg antibiotics had the lowest in richness. Redundancy analysis (RDA) revealed that the pH and temperature were the most important environmental factors that affected microbial community succession, followed by total nitrogen and moisture content during co-composting of food waste and sewage sludge.
研究领域:
环境科学
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微生物学
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废物管理
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产品关联
DOI
PubMed
高影响因子
Journal of Material Cycles and Waste Management
·
2013
·Vol. 15
·期 4
·461-468
·
IF 0.568
Su Lianghu,Shi Xinlong,Guo Guangzhai,Zhao Aihua,Zhao Youcai
The potential benefits of nanoscale zero-valent iron (nZVI) on sludge stabilization, either the abatement of odor or the improvement of biogas production, were investigated in this study. Two commercial-grade microscale iron powders were also utilized for comparison. Adding 0.10 wt% of nZVI in sludge during anaerobic incubation significantly reduced the concentration of H 2 S in biogas by 98.0 % (96.2–98.9 %), probably attributed by reactions between sulfides and the neo-formed hydrous Fe(II)/Fe(III) oxides layer at the surface of ZVI nanoparticles. Meanwhile, the percentage of P in bioavailable fractions decreased from 76.8 to 52.5 %, possibly due to the formation of vivianite [Fe 3 (PO 4 ) 2 ]. Furthermore, 0.10 wt% of nZVI in anaerobic digestion for 17 days enhanced the concentration of CH 4 in biogas by 5.1–13.2 % and improved the production of biogas and methane by 30.4 and 40.4 %, respectively. The amendment of iron nanoparticles during anaerobic digestion can not only effectively reduce H 2 S in biogas, but also potentially boost methane production significantly.
研究领域:
环境科学
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微生物学
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产品关联
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
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2017
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IF 2.991
Chenyu Wang,Wei Zhu,Miao Gong,Ying Su,Yujie Fan
Dewatered sewage sludge was treated with H 2 O 2 and/or Ni in supercritical water in a high-pressure autoclave (400 °C, 23 MPa, 60 min). The combined application of H 2 O 2 and Ni was more effective than applying each separately for hydrogen production and for inhibiting the formation of polycyclic aromatic hydrocarbons (PAHs). The hydrogen yield (0.79–1.28 mol/kg organic matter) of combined additives with different Ni:H 2 O 2 ratios was 21% to 35% higher than the calculated value of the hydrogen yield from the mixture. The Ni:H 2 O 2 ratio affected the ring number composition of PAHs (proportion of 4–6 ring PAHs increased from 13% to 44% with increasing Ni:H 2 O 2 ratio) considerably, but had little effect on the concentration of PAHs. The mechanisms of the Ni/H 2 O 2 additive were also investigated from the viewpoint of combined action and intermediates. Overall, the method developed herein has the potential to promote hydrogen production in an environmentally compatible manner.
研究领域:
环境科学
·
能源工程
·
催化化学
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DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 11
·896-905
·
IF 2.172
Zhihui Pan,Yingru Huang,Xiongrui Yang,Yilun Liang,Junguo He,Huarong Yu
In this study, an advanced temperature-sensitive hydrogel with sewage sludge ash (SSA) was synthesized and employed as draw agent for forward osmosis (FO) desalination. The effects of the incineration temperature (700–1,000°C) of SSA obtention, particle size (20–300 meshes), and dosage (0–4.5 wt%) of SSA were investigated for optimally synthesizing the temperature-sensitive hydrogel to meet the requirement of FO. The resulting hydrogels were characterized in terms of crystal structure, surface morphology, surface functional groups, and lower critical solution temperature (LCST). It was shown that the dosage of SSA significantly influenced the swelling capacity (in different concentrations of NaCl solution) and deswelling property of hydrogels, whereas the other two factors only affected the swelling of hydrogel, but had no effect on the deswelling. In addition, as a result of higher reticulated pore structure, and the hydrogen-bonding interaction between the chemical surface of SSA and monomers of hydrogels, the best production D2.5H as a draw agent generated high average water flux of 2.22 LMH in FO desalination with 2,000 ppm NaCl as feed solution. Furthermore, despite a little higher LCST with the comparison of D0H (blank sample without SSA), the D2.5H as a draw agent can still maintain the prominent temperature-sensitive performance in that, most of the water can be recovered in 10 min of 60°C water bath, and the average water fluxes of FO with even three times regenerated hydrogels were similar to that with the initial.
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
·
2021
·
IF 6.789
Jing Nie,Qiming Wang,Shengya Gao,Chi Sun Poon,Yaoyu Zhou,Jiang-shan Li
With rapid economic growth and urbanisation, the reuse and recycling of solid wastes has become a high priority for the sustainable development of modern cities. In this study, two typical solid wastes, incinerated sewage sludge ash (ISSA) and waste bentonite , were co-valorised to produce granular adsorbents through a simple and energy-saving pelletisation/sintering process. A mixture of ISSA and bentonite at a weight ratio of 3:1 was pelletised and sintered at 700 °C. The resultant ceramsite, with good mechanical strength, could effectively remove Pb(Ⅱ) from aqueous solutions. The adsorption kinetics can be described by the pseudo-first-order (PFO) model. The results indicated that the Pb(Ⅱ) adsorption process was dominated by electrostatic attraction , precipitation, and complexation. The isothermal data exhibited a good correlation with the Freundlich model, indicating that the adsorption process was non-ideal and spontaneous. The maximum adsorption capacity was approximately 21.6 ± 0.35 mg/g at 318 K. After 5 cycles of regeneration, the adsorbent maintained good adsorption performance. Moreover, the removal rate was not greatly affected by ionic strength . These findings demonstrate that the granular adsorbent prepared with ISSA and waste bentonite can be recognised as a promising adsorbent for Pb-containing wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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