Acta Periodica Technologica最新文献_第2页

Evaluation of the efficiency of liquid degassing technology based on the principle of hydrodynamic cavitation 基于水动力空化原理的液体脱气技术效率评价

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.2298/apt2354237n

Anna Nedbailo, Georgy Ivanitsky, Bogdan Tselen, Oleksandr Obodovych, Natalia Radchenko

{"title":"Evaluation of the efficiency of liquid degassing technology based on the principle of hydrodynamic cavitation","authors":"Anna Nedbailo, Georgy Ivanitsky, Bogdan Tselen, Oleksandr Obodovych, Natalia Radchenko","doi":"10.2298/apt2354237n","DOIUrl":"https://doi.org/10.2298/apt2354237n","url":null,"abstract":"The article presents data on the evaluation of the effectiveness of liquid degassing in the conditions of hydrodynamic cavitation, which is implemented in a Venturi tube. Based on the conducted experimental studies and the obtained data on the change in pH of the liquid, a change in the carbonic acid-dissolved gas balance was observed. In the terms of the single bubble dynamics model, the potential different sizes growth of gas microbubbles of under pressure relief conditions for two treatment modes is determined. It was found that increasing the efficiency of degassing causes the pressure in the cavitator to decrease to the maximum possible negative pressure. This allows the growth of the smallest bubbles to be activated in the degasser equipment. It is shown that the theoretical assessment of the potential effectiveness of cavitation degassing is somewhat overestimated. This is explained by the difference in calculated pressure values and actually created pressures in the degassing equipment. Correlation of theoretical calculations of cavitation efficiency based on experimental data showed that in the proposed treatment modes it is possible to activate bubbles from 1.5 to 3.0 ?m, which also ensures a high degree of degassing.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136366668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetic study of adsorption of phenolic compounds from olive oil mill wastewater on activated carbon 活性炭吸附橄榄油厂废水中酚类化合物的动力学研究

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.2298/apt2354197d

Soumia Djeziri, Zoubida Taleb, Hadja Djellouli

{"title":"Kinetic study of adsorption of phenolic compounds from olive oil mill wastewater on activated carbon","authors":"Soumia Djeziri, Zoubida Taleb, Hadja Djellouli","doi":"10.2298/apt2354197d","DOIUrl":"https://doi.org/10.2298/apt2354197d","url":null,"abstract":"Olive oil Mill Wastewater (OMW) is not degradable due to the presence of substances (phenols, volatile fatty acids, etc.), which pose problems for the environment. In order to protect this environment, currently know various treatment methods of wastewater such as adsorption. We have studied in our work the adsorption capacity of phenolic compounds present in Olive Oil Mill Wastewater on activated carbon (AC). The phenolic compounds are known for their carcinogenicity and their high toxicity and the activated carbon is the most popular and widely used adsorbent material for OMW treatment. The AC was prepared by the valorization of agrifood waste that are olive leaves (calcination followed by chemical activation using phosphoric acid). A range of analyses was carried out for the characterization of the used adsorbent, among them: Infrared (IR) spectroscopy, which showed the main characteristic bands of activated carbons, X-ray diffractometry (XRD), iodine value, moisture content, ash content and pHzpc. The effect of several parameters such as contact time, amount of adsorbent and pH of the solution were studied. The best adsorption conditions are simple to achieve: Ambient temperature, direct use of the olive oil mill wastewater (V = 100 mL, pH = 1.95) with 4 g mass of AC adsorbent. The obtained adsorption kinetics showed that the adsorption of phenolic compounds from OMW on prepared activated carbon is well described by the Pseudo second order. The obtained results indicate the possibility of olive leaves valorization in the form of activated carbon with what all this implies as socio-economic impacts","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136366987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A last-mile logisztika fő kihívásai és lehetséges jövőbeli irányai 最后一英里物流的主要挑战和未来可能的方向

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.47273/ap.2023.28.69-84

Viktor Póka

引用次数: 0

Bacillus spp. enzymatic activity to support circular economy 芽孢杆菌的酶活性支持循环经济

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.2298/apt2354325d

Tatjana Dujkovic, Ivana Pajcin, Vanja Vlajkov, Jovana Grahovac

{"title":"Bacillus spp. enzymatic activity to support circular economy","authors":"Tatjana Dujkovic, Ivana Pajcin, Vanja Vlajkov, Jovana Grahovac","doi":"10.2298/apt2354325d","DOIUrl":"https://doi.org/10.2298/apt2354325d","url":null,"abstract":"Agricultural and industrial waste represents the most abundant renewable resource in the biosphere and is readily available in substantial quantities. Recently, there has been a growing focus on harnessing the potential of these types of waste as raw materials for producing value-added products, such as microbial enzymes, using solid-state or submerged fermentation systems. Among all the bacterial genera utilized in the production of industrially important enzymes, the Bacillus genus stands out as the most extensively employed for this purpose. In this study, the production of various enzymes such as protease, pectinase, cellulase, xylanase, lipase, and gelatinase was evaluated using the different Bacillus strains isolated from vegetables? rhizosphere. The growth zones and halos were observed to determine production of the following enzymes: cellulases, proteases, pectinases, xylanases, gelatinases and lipases, confirming the breakdown of complex substrates in the medium. Bacillus Pap 3 exhibited the highest EAI (enzymatic activity index) value (4.00) for pectinase activity, indicating its remarkable extracellular level of pectinase performance. The highest enzymatic activity in terms of halo zone diameters was achieved in the case of cellulases and xylanases production by the isolates Mah 1a and Mah 1b. Further research would be directed towards the production of the tested enzymes by Bacillus spp. on the waste streams of food and agroindustry, but also towards the utilization of the proven enzymatic activity to obtain other microbial value-added products to develop viable bioprocess solutions usable in the circular economy context.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136367862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent findings on mechanical behaviour of stir cast aluminium alloy-matrix composites: An overview 搅拌铸造铝合金基复合材料力学性能研究进展综述

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.2298/apt2354223n

Agha Ndukwe

{"title":"Recent findings on mechanical behaviour of stir cast aluminium alloy-matrix composites: An overview","authors":"Agha Ndukwe","doi":"10.2298/apt2354223n","DOIUrl":"https://doi.org/10.2298/apt2354223n","url":null,"abstract":"This study examined the previous research on the mechanical properties of reinforced composites of aluminium-matrix, manufactured by stir casting. Stir casting has been reported as the most economical fabrication method currently in use for producing Aluminum Matrix Composites because of its accessibility, portability, adaptability to be utilized for large-scale manufacture, and easy operation of the application to conventional shape casting foundry procedures. Apart from the minority report that recorded a reduction in ductility, yield strength, ultimate tensile strength, and modulus of elasticity but with an increase in hardness of the SiC particulate reinforced aluminium matrix composites following the increase in reinforcing material, the majority of work has shown that the mechanical properties increase with the increase in the addition of the reinforcing material. Reinforcing materials like silicon carbide, tungsten carbide, alumina, boron carbide, and multi-walled carbon nanotubes have been used in various compositions to manufacture aluminium-matrix composites. The highest reported ultimate tensile strength of 489 MPa was obtained after stir casting 10 vol% of SiC - aluminium matrix composite. The maximum tensile strength of 401 MPa was attained with 20% B4C - Al-matrix composite. Various uses of metal-matrix composites have been identified in the making of hypersonic aircraft, sporting equipment, and automobile engine parts.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136368101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Membrane installation in storage tanks for seismic loads impact protection 储罐中膜装置用于地震荷载冲击防护

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.2298/apt2354209s

Olena Sierikova, Elena Strelnikova, Denys Kriutchenko

引用次数: 0

Walnut shells as a potential biosorbent for Cu(II), Pb(II) and As(III)/(V) ions removal from river waters 核桃壳作为去除河水中Cu(II)、Pb(II)和as (III)/(V)离子的潜在生物吸附剂

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.2298/apt2354187n

Maja Nujkic, Zaklina Tasic, Dragana Medic, Snezana Milic, Sonja Stankovic

引用次数: 0

Megváltozott munkaképességű emberek foglalkoztatása a vendéglátásban, társadalmi megítélés 社会对酒店业雇用残疾人的看法

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.47273/ap.2023.28.4-17

József Poór, Szilvia Módosné Szalai, Szonja Jenei, Róbert Nagy, Róbert László Keszthelyi

引用次数: 0

Blend microspheres of poly (glycolide-co-ε-caprolactone) and ethyl cellulose for the controlled release of 5-fluorouracil 将聚乙二醇-co-ε-己内酯微球与乙基纤维素混合控释5-氟尿嘧啶

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.2298/apt2354001z

Asma Ziane, Hichem Bakouri, Oum Khoukhi, Kaddour Guemra

{"title":"Blend microspheres of poly (glycolide-co-ε-caprolactone) and ethyl cellulose for the controlled release of 5-fluorouracil","authors":"Asma Ziane, Hichem Bakouri, Oum Khoukhi, Kaddour Guemra","doi":"10.2298/apt2354001z","DOIUrl":"https://doi.org/10.2298/apt2354001z","url":null,"abstract":"In this present study, a series of copolymers with diverse compositions were produced using bulk ring-opening polymerization of glycolide and ?-caprolactone, using stannous(II) octoate as initiator. 1H, 13C NMR, and FTIR spectroscopy were used to characterize the resultant copolymers. After-wards, the oil/water emulsion evaporation technique was used to create blend microspheres of poly (glycolide-co-?-caprolactone) and ethylcellulose in order to investigate the controlled release of 5-fluorouracil, an anticancer drug. The size distribution of the microspheres was studied by optical microscope, which confirmed their spherical nature with sizes ranging from 112 to 186?m, FTIR and X-ray diffraction were used to confirm the polymer blend compatibility and to confirm the absence of drug-polymer interactions. Moreover, in vitro release experiments were performed at 37?C in simulated buffer medium of the stomach (pH=1.2) for 2h, and simulated intestinal medium (pH=7.4). It was found that the release of 5-fluorouracil from blend microspheres followed pH-independent release as compared to that of plain poly(?-caprolactone) and ethylcellulose microspheres for more than 10h. Furthermore, to better understand the nature of the drug release profiles, release data was fitted to empirical models.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136366368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Membranes modified with rigid polymer for processing solutions of vegetable proteins 用刚性聚合物修饰的膜处理植物蛋白溶液

Acta Periodica Technologica Pub Date : 2023-01-01 DOI: 10.2298/apt2354313m

L.C.A. Molina, G.A.V. Magalhães-Ghiotto, L. Nichi, Yuliya Dzyazko, R. Bergamasco

{"title":"Membranes modified with rigid polymer for processing solutions of vegetable proteins","authors":"L.C.A. Molina, G.A.V. Magalhães-Ghiotto, L. Nichi, Yuliya Dzyazko, R. Bergamasco","doi":"10.2298/apt2354313m","DOIUrl":"https://doi.org/10.2298/apt2354313m","url":null,"abstract":"Baromembrane separation is attractive for food industry since it provides no destruction of organic substances. The aim of this study is purposeful formation of the rejection ability of macroporous polymer membranes simultaneously with their resistance against compression for juice clarification and protein fractionalization. This problem is solved by modifying of asymmetric polymer microfiltration membrane with polymethyl methacrilate (PMMA), the content of this rigid modifier was varied from 15 to 80 mass %. Morphology of composite membranes was investigated with SEM method, water test was performed. Based on obtained results, the modifying mechanism was proposed: (I) blockage membrane pores with PMMA particles, (II) stretching pore walls caused by mechanical action of embedded particles, (III) screening pores of both active layer and support with modifier particle located on the outer surface, The optimal PMMA amount in the membranes was found to be up to 20 %. Depending on the modifier content, selectivity of the membranes towards vegetable albumin, which was extracted from Moringa oleifera seeds, reaches 30-91 %. Thus, the membranes can be used for the purposeful separation of the large protein particles from smaller fractions, which can be used as nutritional supplements due to their better digestibility.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136366373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0