PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2014
·
IF 3.828
Huan Liu,Qiang Zhang,Hongyun Hu,Peng Liu,Xiaowei Hu,Aijun Li,Hong Yao
Thermal disposal of sewage sludge is likely to cause serious nitrogen related environmental pollution since it contains considerable amounts of nitrogen, the species of which are quite different from those in coal. Considering that lime (CaO) is a widely applied chemical conditioner for sewage sludge dewatering, this study investigated the catalytic role of conditioner CaO in nitrogen transformation during sewage sludge pyrolysis in a drop-tube/fixed-bed furnace at 873 K, 1073 K and 1273 K, respectively. Model compounds were also used to further clarify the mechanisms involved. According to the results, conditioner CaO increased the fraction of more stable protein-N as well as amine-N. The solid phase reactions produced CaC x N y , thus enhancing the nitrogen retention in char. Correspondingly, decreased relative ratio of nitrates-N/nitrites-N and oxygenated organics in sludge conditioning contributed to less NO emission. Meanwhile, conditioner CaO promoted the conversion of HCN to NH 3 , as well as the deamination of proteins, amine, and other N-containing compounds in tar and char, leading to increased NH 3 generation. Subsequently, CaC x , the decomposition product of CaC x N y , captured NH 3 , driving down the final production of NH 3 . In addition, Ca(OH) 2 hindered the transformation of nitrile-N in char to HCN, decreasing HCN generation. CaO reacted with HCN, further reducing its releasing amount. CaC x N y derived from different sources decomposed to produce a very large amount of N 2 . These indicate that reusing conditioner CaO is a promising strategy for reducing the productions of NO x precursors efficiently and increasing the formation of non-polluting N 2 dramatically.
研究领域:
环境科学
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能源与燃料
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2019
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IF 6.395
Dongdong Ge,Wenrui Zhang,Haiping Yuan,Nanwen Zhu
Extracellular polymeric substances (EPS), especially proteins, exert a vital role in sludge dewatering. Tannic acid (TA), a plant secondary metabolite , is capable of bonding with proteins, and herein we employed it as a novel conditioner for sludge dewatering . The results indicated that TA enhanced sludge dewaterability with high reductions of 81.3% capillary suction time, 87.5% specific resistance of filtration and 13.4% water content of dewatered sludge under the optimized process parameters: TA dosage of 0.15 mmol/gTS, stirring speed of 200 r/min for 1 min, and settling time of 15 min. TA altered sludge properties pronouncedly including viscosity, particle size, zeta potential , pH and EPS contents and correlation analysis revealed their associations with sludge dewaterability. Moreover, EPS fluorescent components, sludge functional groups and surface morphology were detected for a better understanding of TA conditioning mechanism. The findings provide not only the feasibility of TA but also the potential of TA-containing plant waste in sludge treatment .
研究领域:
环境科学
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污水处理
✓ 已验证
产品关联
DOI
高影响因子
Horticulturae
·
2024
·Vol. 10
·期 2
·172
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IF 3.1
Florence Alexandra Tóth,Tamás Magyar,János Tamás,Péter Tamás Nagy
Extreme weather and the declining organic matter content of soils cause serious sustainability problems in agriculture. Therefore, soil conditioner composites (chicken manure, bentonite and super absorbent polymer) were developed and tested in an integrated apple orchard characterized by poor nutrient and water management to study their effects on soil, leaf and fruit attributes. Composites with higher doses of additives increased soil organic carbon by 4–9 g/kg, and organic nitrogen by 1.8–2.8 g/kg compared to the control (p< 0.05). Similarly, soil nitrate content steadily increased from 8–10 mg/kg to 30–38 mg/kg by composites. Composites effectively elevated leaf N, K, Ca, and Mg while not affecting the leaf P (p< 0.05). Treatments significantly enhanced the yields by 14–63% on average compared to the control. Treatments with bentonite improved the fruit weight by 2% and 24% compared to the chicken manure. On average, composite treatments increased the titratable acidity of fruits by 26–43% compared to the control and 0.5–10% compared to the treatment containing solely chicken manure. Overall, the developed organic-based composites are able to cope with changing circumstances that could help mitigate the negative effects of climate change, especially in arid areas, thus contributing to sustainable nutrient management.
研究领域:
农业科学
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环境科学
✓ 已验证
DOI
高影响因子
Biotechnology for Biofuels
·
2020
·Vol. 13
·期 1
·1-9
·
IF 4.815
Wu Xinxing,Tang Wei,Huang Chen,Huang Caoxing,Lai Chenhuan,Yong Qiang
Background Soil-derived exogenous ash (EA) poses a challenge toward lignocellulosic autohydrolysis due to its buffering capacity. Previous works focusing on this phenomenon have failed to also investigate the role that soluble salts, and organic matter plays in this system. Herein, sodium phosphate and sodium humate were employed as model buffering compounds representing soluble salts and organic matter and dosed into a de-ashed wheat straw (DWS) autohydrolysis process to show the potential impacts of WS attached soil conditioners on the WS autohydrolysis efficiency which would further affect the enzymatic digestibility of autohydrolyzed WS.Results Results showed that with the increasing loadings of sodium phosphate and sodium humate resulted in elevated pH values (from 4.0 to 5.1 and from 4.1 to 4.7, respectively). Meanwhile, the reductions of xylan removal yields from ~ 84.3–61.4% to 72.3–53.0% by loading (1–30 g/L) sodium phosphate and sodium humate during WS autohydrolysis lead to a significant decrease of cellulose accessibilities which finally lead to a reduction of the enzymatic digestibility of autohydrolyzed WS from ~ 75.4–77.2% to 47.3–57.7%.Conclusion The existence of different types soil conditioner model compounds results in various component fractions from autohydrolyzed WS in the process of autohydrolysis. A lack of sufficient xylan removal was found to drive the significant decrease in enzymatic accessibility. The results demonstrated the various effects of two typical tested soil conditioners on WS autohydrolysis and enzymatic hydrolysis.
研究领域:
生物化学
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农业科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 10
·1397
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IF 4.034
Zuo Wang,Yaoke Ding,Jincheng Wang
In this work, cellulose nanocrystal (CNC) was modified by an ureido-pyrimidinone (UPy) system based on quadruple hydrogen bondings, and CNC-UPy was obtained. Then, this powder was added into polyvinyl alcohol (PVA), and PVA/CNC-UPy composite membranes and hydrogels were prepared. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), polarizing optical microscopy (POM) and particle size distribution (PSD) were used to characterize CNC-UPy. From the FTIR results, the characteristic peaks of NCO group sat 2270 cm−1disappeared, indicating the successful synthesis of CNC-UPy. XRD results showed that the modification by UPy may change the structure of CNC and its degree of crystallinity was increased. PSD analysis showed that the particle size of CNC was increased and its size distribution became narrower after modification by UPy groups. The structure and properties of the composite membranes and hydrogels were studied by differential scanning calorimeter (DSC), thermogravimetric analysis (TGA) together with investigation of swelling, sustained release and self-healing performances. DSC curves depicted that the glass transition temperature, Tg, of different PVA membranes was increased with addition of different proportions of CNC-UPy. TGA data showed that the temperature of maximum weight loss rate was increased, which illustrated the enhanced thermal stability of PVA/CNC-UPy composites. Meanwhile, it was also revealed that the PVA/CNC-UPy composite hydrogels possess good self-healing and better sustained release behavior for the soil conditioner, fulvic acid (FA).Keywords:cellulose nanocrystal;polyvinyl alcohol;supramolecular interactions;soil conditioner;properties
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Hongyan Tang,Xuebin Wang,Caiyan Wang,Tiantian He,Jincheng Wang
A composite soil conditioner based on Fe-doped hydroxyapatite/polydopamine/amino carbon nanotubes (Fe-HAP@PDA@CNT-NH 2 ) was prepared for controlling release of flavic acid (FA) fertilizers and for the treatment of soil contaminants methylene blue (MB). Firstly, Fe-doped hydroxyapatite (Fe-HAP) was prepared by hydrothermal method. Then, Fe-doped hydroxyapatite/polydopamine/aminocarbon nanotube (Fe-HAP@PDA@CNT-NH 2 ) composite was prepared by in situ polymerization of dopamine (DA) with amino carbon nanotubes (CNT-NH 2 ) on the Fe-HAP surface. Finally, Fe-HAP@PDA@CNT-NH 2 @FA composite soil conditioner was obtained by loading with FA. Scanning electron microscopy (SEM), X-Ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were applied to analyze the composition and morphology of the composites. The loading and slow release experiments showed that Fe-HAP@PDA@CNT-NH 2 owned good loading efficiency on FA and had a wide applicability with different fertilizer slow release effects in different pH environments. Adsorption experiment revealed that Fe-HAP@PDA@CNT-NH 2 possessed high adsorption capacity for MB under different pH conditions. The pseudo-second order and Langmuir models discussed above can be utilized to describe the adsorption mechanism utilizing kinetic and isothermal adsorption models. In addition, the plant experiment also proved the effect of the composite soil conditioner on soil and plants. Hence, the new composite soil conditioner has a great promoting effect on soil improvement and crop growth.
研究领域:
环境科学
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材料科学
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农业科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MICROENCAPSULATION
·
2021
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IF 3.142
Wang Zuo,Wang Jincheng,Song Shiqiang,Rao Pinhua,Wang Runkai,Liu Shihui
Traditional level of fertilisers was used by most farmers in China with the risks about resources wasting, environmental pollution together with soil structure deterioration. It is practicable to tackle the challenges about over-fertilisation and low efficiency with microencapsulated soil conditioner (MSC), which clads the water soluble core with natural polymer. Fulvic acid (FA) can be used as core material, because it possesses the characteristics of water-soluble, fertiliser maintenance and expedient monitoring. The morphology, structure, and properties of MSC were studied and compared. The particle size of MSC was ranged from 1.58 to 2.14 mm with a similar shape which was obtained by conventional measuring method due to their soft features. This was mainly attributed to the concentration of liquid paraffin and the interaction between shell materials and calcium chloride. FTIR spectra showed that a peak appeared at 1372 cm−1, and this was ascribed to the microcapsules crosslinked and solidified by calcium ions. Sustained release experiment revealed that the microcapsules owned better fertiliser-retaining and water-retaining performances, and FA may be released as long as 750 h. Biodegradation experiments revealed that an obvious pore structure was found on the surface of microspheres after 30 d of degradation, and this was consistent with the sustained release experiment. Pot experiment illustrated that the plants cured with the microcapsules showed significant growth trend and grew up to 9.2 cm with a maximum rate, and this revealed that MSC owned better performance of promoting the growth of crop root.
研究领域:
农业科学
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土壤学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BRAGANTIA
·
2024
·
IF 1.2
Lu Wentong,Wang Caiyan,He Tiantian,Wang Jincheng,Wang Zuo,Sun Jibo
The utilization of microencapsulated soil conditioner (MSC) with a water-soluble core and natural polymer shell offers a potential solution to address the issues of over-fertilization and low efficiency in soil. Fulvic acid (FA), a refined form of humic acid, possesses desirable characteristics such as water solubility, fertilizer retention, and convenient monitoring. Urea, a neutral fertilizer, is beneficial for plant growth, easy to store and apply, and causes minimal harm to the soil. Sodium alginate, as a type of natural polymer, has great potential for use in the agricultural sector due to its biocompatibility, environmental safety, and water-holding abilities. The preparation of MSC incorporating FA and urea involved the employment of double emulsion and ion crosslinking mechanism utilizing the sharp-hole coagulation bath method. Structural analysis confirmed the presence of core materials within the MSC. The analysis of the structure indicated that the MSC possessed a particle size about 200 µm, displaying a uniform spherical shape. Subsequent sustained release and biodegradation tests demonstrated the MSC’s ability to significantly enhance both fertilizer retention and water retention capacities. In addition, a planting experiment involving cabbages was conducted employing these microcapsules. The growth status of the cabbages, their physiological activities, nitrogen balance index value, and photosynthesis rate were thoroughly examined. The statistical analysis findings indicated that the MSC possessed the capability to enhance cabbage yield, rendering it a highly promising sustained-release fertilizer.
研究领域:
农业科学
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土壤学
·
植物生理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Fan Yang,Jincheng Wang,Shiqiang Song,Pinhua Rao,Runkai Wang,Shihui Liu,Liqi Xu,Feng Zhang
A novel type of temperature and pH dual-stimuli-responsive microspheric soil conditioner was prepared for the controlled release of urea. First, poly(N-isopropylacrylamide-co-methacrylic acid) [P(NIPAM-co-MAA)] was synthesized, and the microspheric soil conditioner was prepared on the basis of chitosan-coated P(NIPAM-co-MAA) via the emulsion cross-linking method. The structure and morphology of the microsphere were characterized by Fourier transform infrared spectroscopy, hydrogen nuclear magnetic resonance, polarization optical microscopy, and scanning electron microscopy. The microsphere showed controlled release behavior in different temperature and pH conditions, indicating good stimuli responsiveness. The plant experiment revealed that the microsphere can effectively promote plant growth in acidified soil and high-temperature conditions, and the pH value of acidified soil could be improved. In addition, the microsphere possessed good biodegradation property in the soil. Therefore, the multi-responsive microspheric soil conditioner owns a great potential value to amend soil conditions and promote plant growth in agriculture applications.
研究领域:
农业科学
·
土壤学
·
材料科学
·
环境科学
✓ 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）