ENERGY
·
2025
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IF 9.4
Xiaomin Wu,Zhiming Huang,Jingwei Chen
This work investigated the hydrothermal degradation of typical antibiotics present in swine manure (SW) under varying reaction parameters and evaluated the potential of hydrothermal carbonization (HTC) products as high-value carbon materials and liquid fertilizers. The results indicate that doxycycline, sulfadiazine and enrofloxacin were completely degraded under the HTC condition of 260 °C and 40 min, while the optimal HTC conditions for SW were identified as 300 °C, 40 min, and a solid-liquid ratio of 0.1 g/mL. Analysis of the HTC products revealed that hydro-char exhibited favorable surface morphology, a high degree of carbonization, the ability to stabilize heavy metals, a high higher heating value (HHV), and excellent thermal stability. Furthermore, the hydrothermal wastewater complies with discharge standards in terms of heavy metal content, antibiotic concentration, and drug-resistant bacteria content. It also contains significant amount of nitrogen and potassium, along with moderate phosphorus content, highlighting its potential as a liquid fertilizer. This study provides novel insights into the harmless and resourceful utilization of SW and can also serve as a valuable reference for the treatment of other organic waste.
研究领域:
环境科学
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废弃物资源化
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生物工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Jialin Xu,Kuo Zhou,Jinxia Fu,Zaiming Tan,Linlin Qin,Peigao Duan,Yongjun Xu,Shimin Kang
Green recycling of poly(lactic acid) (PLA) has become the future trend for its large-scale application to cope with the “white pollution” associated. In the present study, solvent-free catalytic hydrogenolysis of PLA powder was developed with a carbon utilization of 99 % and 100 % conversion. The primary products were oxygenated liquid fuels with HHV = 29.9 MJ/kg and CO gas (∼99 %, disregard of hydrogen reactant) without the formation of any solid residues. Such hydrogenolysis process was further verified by discarded PLA straws, which possessed 95 % carbon recovery, and the derived oil held an HHV = 30.3 MJ/kg. Benefiting from the solvent-free process and near-zero-waste products, this technique provides an extraordinarily sustainable pathway for recycling PLA and its spent plastics.
研究领域:
环境科学
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化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Sui-Qin Yang,Rui-Qiu Ye,Yu-Hong Cui,Zheng-Qian Liu,Kai Sun,Yu-Ze Yu
Advanced oxidation processes for the treatment of organic pollutants in wastewater suffer from difficulties in mineralization, potential risks of dissolved residues, and high oxidant consumption. In this study, radical-initiated polymerization is dominated in an UV/peroxydisulfate (PDS) process to eliminate organic pollutant of pharmaceutical metoprolol (MTP). Compared with an ideal degradation-based UV/PDS process, the present process can save four fifths of PDS consumption at the same dissolved organic carbon removal of 47.3%. Simultaneously, organic carbon can be recovered from aqueous solution by separating solid polymers at a ratio of 50% of the initial chemical oxygen demand. The chemical structure of products was analyzed to infer the transformation pathways of MTP. Unlike previous studies on simple organic pollutants that the polymerization can occur independently, the polymerization of MTP is dependent on the partial degradation of MTP, and the main monomer in polymerization is a dominant degradation product (4-(2-methoxyethyl)-phenol, denoted as DP151). The separated solid polymers are formed by repeated oxidation and coupling of DP151 or its derivatives through a series of intermediate oligomers . This proof-of-concept study demonstrates the advantage of polymerization-dominated mechanism on dealing with large organic molecules with complex structures, as well as the potential of UV/PDS process for simultaneous organic pollution reduction and organic carbon recovery from aqueous solution.
研究领域:
环境科学
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水处理工程
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Bo Lv,Xiaoman Chai,Xiaowei Deng,Feishuo Jiao,Chaojun Fang,Baolin Xing
Recovering inner residual carbon is important for fully utilizing coal gasification fine slag (CGFS) resources. In this study, we adopted a combined gravity-separation and flotation process to efficiently recover residual carbon by considering the characteristics of the CGFS and optimizing the operating factors of the process. CGFS is principally a mixture of residual carbon and ash, with low-density particles containing more of the former. Accordingly, residual carbon is preliminarily enriched by gravity separation, in which gas velocity ( v g ) and water velocity ( v w ) significantly impact separation efficiency, followed by feed volume ( m ). The residual carbon in the initial concentrate was preliminarily enriched (i.e., loss on ignition ( LOI ): 55.90%; combustible recovery ( R o ): 72.36%) under appropriate operating conditions (i.e., v w = 0.04 m/s, v g = 3 m/s, m = 150 g). Moreover, the quality of the flotation concentrate was most influenced by collector dosage ( m c ), followed by aeration rate ( η ), frother dosage ( m f ), stirring speed ( w ), and grinding time ( t ) during flotation of the primary concentrate. The flotation concentrate exhibited LOI and R o values of 90.95% and 50.34%, respectively, under the optimal flotation conditions (i.e., m c = 20 kg/t, m f = 15 kg/t, w = 2600 rad/min, η = 200 L/h, t = 360 s); it has a high residual carbon content and is an ideal raw material for preparing fuels or carbon materials.
研究领域:
矿物加工工程
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资源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2024
·
IF 4.5
Shiwei Wang,Mohana Rao Kadagala,Luis Vinnett,Naresh Kumar Sharma,Guomin Wei
The effectiveness of flotation for decarbonizing fine slag from coal gasification depends on the selection of appropriate collectors or surfactants. This study explored the synergistic effect of kerosene combined with cationic surfactants, including dodecyl trimethylammonium chloride, dodecylamine, and dodecylamine hydrochloride, on recovering residual carbonaceous material from coal gasification fine slag, using both MD and experimental simulations. The Scanning electron microscopy and X-ray spectroscopy revealed that the water molecules and oxygen-rich silicon glass beads dominated the slag surface, while the XPS analysis demonstrated that the functional groups containing oxygen on the residual carbon surface promote hydrogen bonding with water molecules in the flotation solution. The results suggested that the highest yield, along with optimal Loss on Ignition (LOI) and combustible recovery, was achieved at the 10 −5 mol/L surfactant concentration. The MD simulations demonstrated that dodecylamine had the highest diffusion coefficient and adsorption capacity, explaining its superior interaction with residual carbon surfaces and its effectiveness in the decarbonization process. This approach contributed to the valorization and reuse of carbon generated by the waste of coal gasification fine slag.
研究领域:
能源科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
·
IF 8.4
Yuhan Long,Haoying Zhang,Hanzhao Yang,Mengze Han,Changyan Wang,Xuesong Zhan,Dongfang Liu,Wenli Huang
Coal gasification slag (CGS) is a challenging solid waste due to the presence of highly toxic heavy metals, which pose significant risks to environmental and human health. CGS cannot be freely reused or disposed of, creating considerable obstacles to solid waste resource utilization. This study presents a novel method for heavy metal removal from CGS through a separation-oxidation-acid washing (SOA) process, which effectively recycles residual carbon (RC) while minimizing the risk of heavy metal leakage. The chemical morphology, leaching patterns, and environmental risks of heavy metals in CGS following the SOA process were investigated, demonstrating effective separation and removal. The ignition loss (LOI) in CGS exceeded 45% after treatment, significantly surpassing the original value. Removal rates for Sb, Pb, and As from coal gasification fine slag (CGFS) were 88.6%, 75.88%, and 79.35%, respectively, while rates for Sb, As, and Ni from coal gasification coarse slag (CGCS) were 56.65%, 63.24%, and 50.8%. The risk assessment codes (RAC) for Cu, Co, and Sb in CGFS were reduced to low-risk levels of 3.18%, 10.30%, and 25.21%, respectively, and the relative leaching ratios (RLR) for Co (0.162%), Cu (0.006%), and Ni (0.180%) in CGCS exhibited notable reductions, suggesting that the applied process significantly mitigates the environmental risk and leaching potential of these heavy metals. Overall, this study contributes to the clean production of coal gasification enterprises by offering an environmentally friendly strategy for heavy metal removal and enhancing resource utilization through RC recovery.
研究领域:
环境科学
·
资源与能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Xiang Zou,Junguo He,Xinlei Pan,Qiupeng Cai,Shengye Duan,Xinxin Cui,Yijie Zhong,Jie Zhang
The asynchronous dosed protease and lysozyme combination pretreatment was proved to be effective in enhancing the anaerobic fermentation of waste activated sludge (WAS). However, humic acid (HA) in the sludge could interact with hydrolase and restrain the hydrolysis efficiency, thus inhibiting short-chain fatty acids (SCFAs) production. This study investigated the effectiveness and mechanism of enzymatic pretreatment against HA. Results showed that the enzyme cocktail method increased the extracellular bioavailable contents by 34 %, which raised SCFAs production by 89.69 % (1269.65 mg COD /L). The balanced ratio of hydrolysis and fermentation communities suggested that the small molecular organics generated by the hydrolysis community could be sufficiently utilized by fermentation communities. The metabolism of amino acids and glucose was facilitated, and the activities of key enzymes were enhanced. These results clarified the effect of asynchronous enzyme cocktail pretreatment against HA inhibition and contributed to SCFAs production, which offered fresh perspectives on carbon recovery.
研究领域:
环境工程
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生物化学工程
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废物管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
·
IF 5.279
Chen Yang,Jiajia You,Mengkai Hu,Ganfeng Yi,Rongzhen Zhang,Meijuan Xu,Minglong Shao,Taowei Yang,Xian Zhang,ZhiMing Rao
2,5-Dimethylpyrazine (2,5-DMP) is an important pharmaceutical intermediate and an important essence. Conventional chemical synthesis methods are often accompanied by toxic substances as by-products, and the biosynthesis efficiency of 2,5-DMP is insufficient for industrial applications. In this study, the tdh and soaao genes were overexpressed to enhance enzymatic and nonenzymatic reactions in metabolic pathways, and kbl was knocked out to block competitive branching carbon flow metabolic pathways. Finally, a genetically engineered Escherichia coli strain with the highest carbon recovery rate (30.18%) and the highest yield reported to date was successfully constructed, and 9.21 g·L–1 threonine was able to produce 1682 mg·L–1 2,5-DMP after 24 h. At the same time, an expression regulation strategy and whole-cell biocatalysis helped to eliminate the damage to cells caused by 2,5-DMP, aminoacetone, and reactive oxygen species generated by aminoacetone oxidase from S. oligofermentans, and the negative effect of 2-amino-3-ketobutyrate CoA ligase on the yield of 2,5-DMP in E. coli was also demonstrated.
研究领域:
代谢工程
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生物技术
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Chang-An Huan,Qiandi Wang,Xiqi Li,Cong Du,Qingjie Meng,Xu Kang,Wenzong Liu
A huge production of waste activated sludge (WAS) has been a burden for wastewater treatment plants (WWTPs) with high disposal cost and little benefit back to wastewater purification. The short-chain fatty acids (SCFAs) produced by a short-term acidogenic fermentation of WAS before methane production have been proven to be a high-quality carbon source available for microbial denitrification process. The dual purpose of full recovery of fermentation liquid products and facilitating disposal of residual solid waste necessitate an efficient solid-liquid separation process of short-term fermentation liquid. The transformation and loss of various soluble carbon sources between solid and liquid are very important issues for carbon recovery efficiency when combining short-term fermentation and sludge dewatering in WWTPs. Here we testified the three conventional preconditioning coagulants, Polyferric Sulfate (PFS), Poly Aluminum Chloride (PAC) and Polyacrylamide (PAM), to improve the efficiency of subsequent solid-liquid separation. The results show that conversion yield of SCFAs in the liquid phase of sludge after short-term fermentation was 195 mg COD/g VSS, when using the coagulants PFS, PAC, and PAM for recovery, the recovery ratio was 79.5%, 82.0%, and 85.9%, respectively, while the dewaterability could be improved after preconditioning short-term fermentation sludge. The complexation of Al 3+ /Fe 3+ in metal coagulants with carboxyl groups of SCFA demonstrated by Density Functional Theory calculation led to small part of soluble carbons co-migration to the solid phase, mainly a loss of high molecular weight organic compounds (carbohydrate, proteins, humic acids), while the application of PAM had little impact on carbon recovery. Economic calculations further showed PAM preconditioning short-term fermentation liquid of WAS could achieve higher recovery benefits.
研究领域:
环境工程
·
污水处理
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生物技术
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Xiang Zou,Junguo He,Pengfei Zhang,Xinlei Pan,Yijie Zhong,Jie Zhang,Xuewei Wu,Biqing Li,Xia Tang,Xiannian Xiao,Heliang Pang
This study introduced the excellent improvement of enzyme cocktail (lysozyme and protease) on hydrolysis efficiency and the role of reducing carbon emission as an alternative carbon source. The best dosing method after optimization was to add four parts of lysozyme at 0 h and one part of protease at 1 h. The extracellular proteins and polysaccharides increased by 118% and 64% respectively under the optimal dosing mode. Enzyme cocktails reduced more organic matters and extended the distribution of sludge particles in the small particle size part. The enzymatic-treated sludge could reduce 21.09 kg CO 2 /t VSS if utilized to replace methanol for denitrification carbon source. Enzyme cocktails did better in enhancing both solubilization and hydrolysis than single enzymes under the optimal method. This study will provide a more integrated and comprehensive system for enzymatic pretreatment and new insight into the enzymatic pretreatment enhancing hydrolysis and reducing carbon emission.
研究领域:
环境科学
·
废水处理
·
生物技术
·
碳管理
·
可持续工程
✓ 已验证
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）