ENERGY & FUELS
·
2024
·
IF 5.2
Yuxiang Chen,Chao Li,Lijun Zhang,Shu Zhang,Jun Xiang,Song Hu,Yi Wang,Mortaza Gholizadeh,Xun Hu
Pig manure is a typical solid waste, which features a high content of inorganics. These inorganics might be involved in thermochemical conversion of pig manure, and this was investigated herein by pyrolysis of pig manure leached with varied concentrations of H2SO4 (0.5–6 mol L–1) at 600 °C. The removal of acid-leachable inorganics [CaCO3, Ca3(PO4)2, alkaline oxides, etc.] exposed more acidic sites derived from the oxides, like SiO2. This enhanced production of the gases at the expense of bio-oil. Furthermore, aromatization and secondary condensation reactions were also promoted, increasing not only the yield of char (from 29.6 to 39.7%, on an organic basis) but also the carbon content in char from 16.1% (blank sample) to 26.2% (leached with 6 mol L–1 H2SO4). Leaching partial inorganics rendered more sufficient contact and interaction between the organics, facilitating charring of organic matter. This further retained more carbon skeleton for generation of more micropores, which further enhanced the capability of the resulting char for adsorption of phenol. In situ infrared analysis indicated the presence of more abundant oxygen-containing functionalities and carbonaceous species after the leaching treatment, favoring the occurrence of aromatization reactions.
研究领域:
环境科学
·
能源转化
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2025
·
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
·
废弃物资源化
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Leiyu Feng,Xuyao Li,Xutao Chen,Yujun Huang,Kangshou Peng,Yuxuan Huang,Yuanyuan Yan,Yinguang Chen
Ordered nitrogen-doped mesoporous carbon (NMC) was successfully synthesized with pig manure as the precursor. The resulting NMC materials exhibited excellent capacity of adsorption and potassium persulfate (PS) activation when used as catalysts for the oxidative degradation of tetracycline antibiotics (tetracycline hydrochloride (TH) as the target). For an initial TH concentration of 35 mg/L, the maximum adsorption capacity of NMC material prepared at 700 °C (NMC700) was 122.0 mg/g, and the degradation efficiency in the PS reaction system was 94.8% within 120 min. Investigation of the mechanism indicated that the NMC700 material with specific surface area (SSA) of 275.5 m 2 /g and 0.7% graphitic N content, provided a large amount of active sites for adsorption and catalytic oxidation of TH. Based on the results of selective degradation and electron paramagnetic resonance (EPR) experiments, a non-radical pathway for the degradation of pollutants was proposed. Chronoamperometry evaluation also supported the conclusion that the NMC material enhanced electron transfer to activate persulfate, accelerating the removal of TH.
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
Biochar
·
2021
·Vol. 3
·期 3
·391-405
·
IF 0
Li Chao,Sun Yifan,Zhang Lijun,Wang Changxu,Zhang Shu,Li Qiaoling,Xu Leilei,Hu Xun
Biomass and pig manure have distinct compositions and the co-pyrolysis of them has gained much attention. However, the influence of volatiles interaction on the properties of the char was still unclear. In this study, lignin was selected as the model component of biomass with pig manure for co-pyrolysis at 600 °C. The results indicate that volatiles from co-pyrolysis promoted re-condensation reaction, resulting in the higher char yield (48.0% in co-pyrolysis versus 31.0% in pyrolysis of single manure) and the formation of more aromatics in bio-oil. The co-pyrolysis also facilitated the dehydrogenation and dehydration reactions, which accounted for the elimination of oxygen and nitrogen contents and thus a higher carbon content (64.7% in the co-pyrolysis versus the averaged value of 46.4% from the pyrolysis of single feedstock), higher crystallinity and thermal stability of the char. The in-situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) characterization results demonstrated that the functionalities abundances of char with temperature was influenced by volatiles interaction via accelerating the carbonization reaction. In addition, the high heating value (HHV) of char was obviously improved by cross-interaction of volatiles during co-pyrolysis (24.4 MJ/Kg in co-pyrolysis versus averaged value of 15.1 MJ/Kg from single pyrolysis), implying that the co-pyrolysis enhanced the energy density of the resulting char. Graphic abstract
研究领域:
能源与环境科学
·
化学工程
✓ 已验证
DOI
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Wei Sun,Xun Qian,Jie Gu,Xiao-Juan Wang,Li Zhang,Ai-Yun Guo
High concentrations of residual arsanilic acid occur in pig manure due to its use in feed to promote growth and control diseases. This study compared the effects of arsanilic acid at three concentrations (0, 325, and 650 mg/kg dry pig manure) on the abundance of antibiotic resistance genes (ARGs) and the microbial community during anaerobic digestion. Addition of 650 mg/kg arsanilic acid enhanced the absolute abundances of tetC , sul2 , ermB , and gyrA more than twofold in the digestion product. Redundancy analysis indicated that the change in the microbial community structure was the main driver of variation in the ARGs profile. The As resistance gene arsC co-occurred with four ARGs and intI1 , possibly causing the increase in ARGs under pressure by arsanilic acid. High arsanilic acid concentrations can increase the risk of ARGs occurring in anaerobic digestion products. The amount of arsanilic acid used as a feed additive should be controlled.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
Sustainability
·
2021
·Vol. 13
·期 7
·4014
·
IF 3.251
Zijing Fan,Mei Zhang,Xiaxia Chen,Zhongda Hu,Qihang Shu,Chaosen Jing,Xingzhang Luo
Oxytetracycline (OTC) is a commonly used antibiotic in livestock farming for controlling intestinal and respiratory infections in farm animals. However, the absorption of antibiotics by animals is limited, and most antibiotics are excreted in the original form with manure, which will have an impact on the environment. The removal of antibiotics from swine manure could generally be performed via anaerobic digestion (AD). In this study, the effect of oxytetracycline (OTC) at doses of 0.1, 0.5, and 1.0 mg/L on the thermophilic anaerobic digestion of swine manure (55 °C) in batch digesters was studied. The methane production, volatile fatty acid (VFA) levels, and dissolved organic matter (DOM) were determined and compared with the control (0 mg/L of OTC). The results indicate that (1) OTC at 0.1 mg/L had no inhibitory effect on methane production or on the accumulation of VFAs, while 0.5 mg/L and 1.0 mg/L inhibited methane production, with inhibition rates of 4.03% and 14.12% (p< 0.05), respectively; (2) the VFAs of each reactor peaked on the first day of the reaction, and as the OTC dose increased from 0 to 1.0 mg/L, the maximum VFA accumulation increased from 1346.94 mg/g to 2370 mg/g of volatile solids (VS); and (3) oxytetracycline (0.5 and 1.0 mg/L) could promote the temporary accumulation of propionic acid, which did, however, not result in significant VFA accumulation. Further, OTC at 1.0 mg/L can promote DOM production, and therefore, VFA accumulation.Keywords:thermophilic anaerobic digestion;oxytetracycline;volatile fatty acids;methane production;swine manure
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Qingyin Li,Haisheng Lin,Shu Zhang,Xiangzhou Yuan,Mortaza Gholizadeh,Yi Wang,Jun Xiang,Song Hu,Xun Hu
Co-hydrothermal carbonization (HTC) of livestock manure and biomass might improve the fuel properties of the hydrochar due to the high reactivity of the biomass-derived intermediates with the abundant oxygen-containing functionalities. However, the complicated compositions make it difficult to explicit the specific roles of the individual components of biomass played in the co-HTC process. In this study, cellulose was used for co-HTC with swine manure to investigate the influence on the properties of the hydrochar . The yield of hydrochar obtained from co-HTC reduced gradually with the cellulose proportion increased, and the solid yield was lower than the theoretical value. This was because the cellulose-derived intermediates favored the stability of the fragments from hydrolysis of swine manure. The increased temperature resulted in the reduction of the hydrochar yield whereas the prolonged time enhanced the formation of solid product. The interaction of the co-HTC intermediates facilitated the formation of O-containing species, thus making the solid more oxygen- and hydrogen-rich with a higher volatility. In addition, the co-HTC affected the evolution of functionalities like -OH and C O during the thermal treatment of the hydrochar and altered its morphology by stuffing the pores from swine manure-derived solid with the microspheres from HTC of cellulose. The interaction of the varied intermediates also impacted the formation of amines, ketones, carboxylic acids , esters, aromatics and the polymeric products in distinct ways.
研究领域:
环境科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jun Liao,Ling Ding,Yong Zhang,Wenkun Zhu
In this work, three kinds of biochars (PMBC-H 2 O, PMBC-PP and PMBC-HP) with excellent adsorption performance were obtained by carbonizing pig manure pre-treated with different agents. These biochars had the ordered mesoporous structures and possessed abundant active functional groups on their surface. The adsorption behaviors of the biochars towards U VI under various conditions were evaluated by batch experiment. The results showed that KMnO 4 and H 2 O 2 could enormously improve the adsorption performance of PMBC to U VI . After KMnO 4 and H 2 O 2 pretreatment , the maximum adsorption capacities of PMBC-PP (979.3 mg/g) and PMBC-HP (661.7 mg/g) were about 2.6 and 1.8 times higher than that of PMBC-H 2 O (369.9 mg/g), respectively, which was much higher than previously reported biochar-based materials. Obviously, KMnO 4 pretreatment leaded to a higher enhancement than that of H 2 O 2 . The removal mechanism of U VI on PMBC-PP was discussed in-depth. The interaction between U VI species and PMBC-PP was mainly ascribed to the abundant active sites on the surface of PMBC-PP. In a word, conversion of pig manure pre-treated with KMnO 4 into biochar not only demonstrates that PMBC-PP has great potential in the treatment of actual uranium-containing wastewater, but also provides a method for the rational utilization of pig manure to reduce the pollution.
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
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yousif Abdelrahman Yousif Abdellah,Hong-Yu Chen,Shan-Shan Sun,Xi Yang,Yu-Sen Luo,Ayodeji Bello,Taha Ahmed Mohamed,Rong-Jie Ren,Wan-Ting Li,Rashid Mohamed Ahmed,Rui-Long Wang
The overuse of antibiotics in livestock farms and their subsequent accumulation in manures lead to increase antibiotic resistance genes (ARGs) in the compost products. Yet, the function of humic acid (HA) in shaping antibiotics and ARGs abundances, microbial structure, and product quality during composting remains unclear. Here, the efficiency of added HA in reducing antibiotics and ARGs abundances during swine manure (SM) composting was studied using five rates of HA: 0%, 1%, 2%, 4%, and 6%. The findings indicated that the abundance of ARGs types such as LSM, bacitracin, macrolide, sulfonamide, tetracycline , and vancomycin and ARGs subtypes including MacB , MexD , OleB , SrmB , Sul 1, VanHB , VanSB , pbp2b , tetPB , and tetX decreased significantly under 6% HA amount compared with CK compost ( P < 0.05). Besides, the added 6% HA shaped the abundance of the bacterial community (notably Acinetobacter , Pseudoxanthomonas , and Luteimonas ), as well as the level of carbohydrate metabolism and amino acid metabolism (6.9% and 5.4%, respectively), which can be taken as an indicator for microbial activity , thereby accelerating antibiotics decrease. RDA analysis revealed that TOC , moisture content, and pH considerably influenced microbial activity and ARGs reduction ( P < 0.05). The estimation of compost quality indicated that 6% HA significantly improved the total content of humic substance and HA to 120.7 ± 1.02 g/kg and 62.3 ± 0.92 g/kg, and reduced the content of fulvic acid to 12.8 ± 1.22 g/kg, thus promoting antibiotics and ARGs reduction. Overall, this study offers a promising option for improving compost quality and safety and mitigating ARGs circulation in the natural environment.
研究领域:
环境科学
·
微生物学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Liao Jun,He Xiaoshan,Zhang Yong,Zhang Lin,He Zhibing
The purpose of this study was to develop a carbon material with excellent adsorption performance of uranium, which could effectively reduce the risk of damage to the water environment caused by pig manure (PM) and uranium-containing wastewater. Three kinds of biochars (PMBC-300, PMBC-500, and PMBC-700) were successfully constructed with pig manure as the precursor at different carbonization temperature (300, 500, and 700 °C) for removing uranium from the solution. Meanwhile, various adsorption isotherm and kinetics models were applied to deeply discuss the adsorption performances and mechanism of pig manure-derived biochar for uranium. The results showed that the surface charge and active sites of PMBC were the important parameters to affect the removal of uranium. The adsorption capacity of PMBC-500 reached 376.5 mg/g (m/V = 0.1 g/L, pH = 4, and T = 298 K) due to the abundant active sites (phosphate, carbonate, and oxygen-containing groups), which was much higher than that of other reported carbon materials. Therefore, it could be considered that the conversion of PM into PMBC was a feasible method, which would effectively remove uranium from the solution and reduce the pollution of PM to the environment. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ping Zhang,Qi Liu,Hedong Yao,Tianqi Wang,Bo Zeng,Youqin Zou,Shiyi Fu,Kai Hu,Hongjun Guo
Emerging antibiotic pollutants pose a growing environmental challenge due to their complexity and widespread use. Swine manure (SM)-derived hydrothermal carbon adsorbents offer the potential for waste mitigation in livestock farming but are limited by low efficiency and poor pollutant recognition. Herein, a copper-decorated hydrochar with high selective adsorption capacity for antibiotics was engineered by incorporating Cu(II) into SM via a low-temperature hydrothermal carbonization. Characterizations revealed that copper, mainly in the form of CuO at lower hydrothermal temperatures, significantly enhanced tetracycline (TC) adsorption, achieving an uptake capacity of 291.2 mg·g −1 at 298 K, which surpassed that of most reported adsorbents on carbon materials. The adsorption performance was largely unaffected by various coexisting substances (anions and cations), except for H 2 PO 4 − and CO 3 2− . It remained effective across a wide pH range (4–10), exhibited exceptional selectivity for tetracycline-family antibiotics (TCs) in single and mixed systems, and was significantly superior to the pure CuO system. This selectivity was attributed to the formation of surface complexation between Cu(II) and the enol-carboxyl groups in TCs, as confirmed by XPS analysis and theoretical calculations. Fixed-bed column tests validated its efficiency in TC removal from real effluent, with a breakthrough point of 253 min for 10 % of the initial adsorbate concentration. This study not only supports the high-value utilization of SM resources but also provides valuable insights into the efficient and selective adsorption of antibiotics from wastewater.
研究领域:
环境科学
·
材料科学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2019
·Vol. 11
·期 22
·6396
·
IF 2.592
Chaozhi Hao,Yuepeng Pan,Zhongyi Zhang,Yang Zeng
Ammonia (NH3) emissions have become a serious environmental pollution problem, and livestock production is an important source of NH3emissions, especially pig farming. The origin of NH3release is the hydrolysis of urea in urine that is catalyzed by urease present in feces. This research determined the urease activity in fresh feces by Michaelis–Menten kinetics and then compared the process of urea hydrolysis and ammonia production in fresh slurry. For feces, the kinetic parametersVmaxandK’mwere calculated by determining the concentration of ammonium in initial 5 minutes in closed vessels, and the resultingVmaxandK’mwere 26.9 ± 1.2 mmol·[urea]·kg−1·min−1and 99.7 ± 3.5 mmol·[urea]·l−1, respectively. In fresh slurry, the rate of urea hydrolysis determined directly was higher than the ammonium formation rate in the early stage (0–8 h) and was accompanied by a rapid rise in pH. In addition, we further explored the effects of temperature, pH, and mixing rate on urease activity within different periods (0–5 min, 5 min–2 h and 2 h–8 h). Our observations show that the optimal urease activity occurred at 35 °C, pH 6.71, and 821.83 rpm of stirring, indicating that microbial species and communities associated with urease production are affected by environmental conditions.
研究领域:
环境科学
·
微生物学
·
动物科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）