1. Microfibres and coliforms determination and removal from wastewater treatment effluentJolanda Rihter Pikl, Aleksandra Lobnik, Milenko Roš, Hakim El Khiar, Nataša Uranjek, 2024, izvirni znanstveni članek Opis: The research aim was to remove as many microfibres, microplastics and harmful bacteria as possible from the
polluted water to produce suitable water for reuse. The test water was the effluent from the municipal wastewater treatment plant in Shalek Valley. A pilot plant with a ceramic SiC filter for membrane filtration and
ozonation of filtered water was set up to remove suspended solids, micro-fibres, microplastics, and harmful
microorganisms. The Microfibers Detection System was developed to identify microfibers on-site. The results
showed that the microfiltration system combined with ozone treatment effectively removed total suspended
solids, microfibres, microplastics and microorganisms. A detection system method for identifying microfibres and
microplastic particles was used to determine how many microfibres and microorganisms were identified by
membrane filtration and ozonation. The study showed that membrane filtration successfully removed all
microfibres, 88% of total coliforms and 93% of E. coli. After additional ozonation, we achieved a 100% removal
rate of total coliforms and a 100% removal rate of E. coli. The treated water (effluent from the municipal
wastewater treatment plant) can be used for specific purposes, such as agricultural irrigation or enhancing
bathing waters near the plant’s water effluent. Ključne besede: microfibres removal, microplastics, microfiltration, ozonation, water reuse Objavljeno v DKUM: 26.09.2024; Ogledov: 0; Prenosov: 11
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3. No significant radiological signs of adult spinal deformity progression after a mean of 11 years of follow-up following Harrington rod instrumentation removal and watchful waitingPeter Brumat, Janez Mohar, Dejan Čeleš, Danijel Erdani, Nikša Hero, Matevž Topolovec, 2023, izvirni znanstveni članek Opis: The study aimed to assess long-term radiological outcomes in patients from our institution who were primarily treated for adolescent idiopathic scoliosis with surgical correction using Harrington rod (HR) instrumentation, and afterward with watchful waiting of residual spinal deformity after HR removal, whereby no patient consented to spinal deformity correction. A single-institution case series of 12 patients was retrospectively evaluated. Preoperative and most recent post-instrumentation removal radiographic measurements were compared, along with baseline characteristics. The average age of patients (all females) at the time of HR instrumentation removal was 38 ± 10 years (median 40, range 19–54). The mean follow-up from the HR instrumentation implantation to the HR instrumentation removal was 21 ± 10 years (median 25, range 2–37), with a further mean of 11 ± 10 years (median 7, range 2–36) of follow-up following HR instrumentation removal and watchful waiting. No significant change in radiological parameters was observed: LL (p = 0.504), TK (p = 0.164), PT (p = 0.165), SS (p = 0.129), PI (p = 0.174), PI–LL (p = 0.291), SVA (p = 0.233), C7-CSVL (p = 0.387), SSA (p = 0.894), TPA (p = 0.121), and coronal Cobb angle (proximal (p = 0.538), main thoracic (p = 0.136), and lumbar (p = 0.413)). No significant change in coronal or sagittal parameters was observed in this single-institution long-term radiological outcome study of adults following HR instrumentation removal and watchful waiting of residual spinal deformity. Ključne besede: adult spinal deformity, Harrington rod instrumentation, spinal instrumentation removal, watchful waiting, long-term outcome, radiographic outcome Objavljeno v DKUM: 16.04.2024; Ogledov: 208; Prenosov: 10
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4. Cellulose nanofibrils-reinforced pectin membranes for the adsorption of cationic dyes from a model solutionAlenka Ojstršek, Selestina Gorgieva, 2024, izvirni znanstveni članek Opis: In the presented research, a facile, one-step method for the fabrication of cellulose nanofibrils/pectin (CNFs/PC) membranes is described, which were tested further for their ability to remove cationic dyes from the prepared model solutions. For this purpose, ten membranes were prepared with different quantities of CNFs and PC with/without citric acid (CA) or CaCl2 as mediated crosslinking agents, and they were characterised comprehensively in terms of their physical, chemical, and hydrophilic properties. All the prepared CNFs/PC membranes were hydrophilic with a Water Contact Angle (WCA) from 51.23◦ (without crosslinker) up to 78.30◦ (CaCl2 ) and swelling of up to 485% (without crosslinker), up to 437% (CaCl2 ) and up to 270% (CA). The stability of membranes was decreased with the increase in PC; thus, only four membranes (M1, M2, M3 and M5) were stable enough in water after 24 h, and these were additionally applied in the adsorption trials, using two structurally different cationic dyes, i.e., C.I. Basic Yellow 28 (BY28) and C.I. Basic Blue 22 (BB22), in four concentrations. The highest total surface charge of M3 (2.83 mmol/g) as compared to the other membranes influenced the maximal removal efficiency of both dyes, up to 37% (BY28) and up to 71% (BB22), depending on the initial dye concentration. The final characteristics of the membranes and, consequently, the dye’s absorption ability could be tuned easily by changing the ratio between the CNFs and PC, as well as the type and amount of crosslinker. Ključne besede: cellulose nanofibrils, pectin, cationic dyes, adsorption, dye removal Objavljeno v DKUM: 12.03.2024; Ogledov: 320; Prenosov: 18
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5. New technique to evaluate the overall heat loss coefficient for a flat plate solar collectorAmor Bouhdjar, Hakim Semai, Aissa Amari, 2021, izvirni znanstveni članek Opis: Low-temperature solar systems mostly use flat plate solar collectors. Good design and correct dimensioning of a solar heat generator are based on precise knowledge of the characteristics of the flat plate solar collector on site. The present work considers a flat plate solar air collector, a flat plate solar water collector, and a flat plate solar water collector with air absorber cooling. The investigation intends to shed light on a procedure to determine the overall heat loss coefficient and the heat removal factor using recorded system temperatures, operating parameters, and environmental data. The Hottel-Whillier-Bliss equation gives the collector useful energy. This expression is used to generate a correlation for the collector efficiency through a linear fitting. We calculate the overall heat loss coefficient of the collector from the slope of the collector efficiency curve. However, we need to know the heat removal factor of the collector. In this study, we present a new technique to calculate the heat removal factor. Then we deduce the collector overall heat loss coefficient. Results show that, very often, the overall heat loss coefficient for the flat plate solar air collector and the flat plate solar water collector determined with this new method is higher than the one calculated with the empirical formula proposed by Klein. However, the experimental overall heat loss coefficient for the flat plate solar water collector with air absorber cooling is smaller than the one calculated with the empirical formula proposed by Klein. The analysis shows that the overall heat loss coefficient determined with the new technique seems more realistic since all phenomena occurring during the heat transfer from solar irradiance incident on the absorber plate and transmitted to the transport fluid are considered. Ključne besede: flat plate solar collector, overall heat loss coefficient, heat removal factor Objavljeno v DKUM: 10.11.2023; Ogledov: 283; Prenosov: 9
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