Theses (Department of Environmental Engineering)
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Theses collection of the Faculty of Engineering.
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Megjelenítve 1 - 8 (Összesen 8)
Tétel Korlátozottan hozzáférhető Unlocking Chlorella Vulgaris Growth Potential: CO2 Dosing and Nutrient Solution InteractionsSpahiu, Rozafa; Nagy, Péter Tamás; Magyar, Tamás; DE--Műszaki KarMicroalgae, e.g. Chlorella vulgaris cultivation could contribute to achieve several sustainable development goals (SGDs), such as zero hunger, clean water, and sanitation as well as affordable and clean energy. Moreover, microalgae are known as the most efficient biological sequesters, since the photosynthetic process results in the conversion to carbohydrates and oxygen from the captured CO2, meanwhile a large amount of biomass is generated that can be used as animal feed, substrate for biofuel production and a protein supplement. The objective of the research was to investigate the biomass productivity of Chlorella vulgaris microalgae in a self-developed, optimized N:P ratio nutrient solution (T3) with variable CO2 injection (0 mL·min-1 (reference), 2 mL·min-1, 3.5 mL·min-1 and 5 mL·min-1). To characterize the biomass growth as well as the nutrient consumption over the 6-week-long experiment, several biological (chlorophyll concentration and microalgae activity rate) and physico-chemical (NH4+, NO3-, K+, PO43-, COD, pH, EC, and temperature) parameters were monitored weekly. These parameters across altered CO2 injection rates have shown distinct patterns of fitting. Notably, the type of fitting for these parameters varied depending on the CO2 injection rate, with logarithmic and linear trends observed. The decrease in these parameters suggests that the microalgae are effectively utilizing nutrients for growth, emphasizing the potential of optimized N:P ratio nutrient solutions coupled with variable CO2 injection to enhance microalgae biomass productivity. During the cultivation process, a pH drop was observed in all samples due to the CO2 injection, therefore a 0.1 mol dm-3 NaOH solution was used for the pH stabilization. Overall, it was found that 2 mL·min-1 of CO2 injection could significantly enhance the photosynthetic activity resulting in higher chlorophyll concentration with 60.65% compared to the control, while 5 ml·min-1 inhibited the microalgae cultivation.Tétel Korlátozottan hozzáférhető Study of treated wastewater reuse in industrial water supplyImamverdiyev, Anar; Bodnár, Ildikó; Truzsi, Alexandra; DE--Műszaki KarA comprehensive experimental approach was employed, utilizing a range of treatment techniques including ion exchange resin, activated carbon filtration, activated carbon and zeolite combined, and chemical precipitation with AgNO3 and FeCl3. Analysis of crucial parameters such as pH, turbidity, total organic carbon, zeta potential, and conductivity were conducted on both treated and control tap water samples. The research demonstrates that IER is highly effective in reducing turbidity, electrical conductivity, and removing ions, making it a superior contender for industrial water reuse. Activated carbon, though promising for reducing turbidity, offers less comprehensive water quality improvement. Combining activated carbon and zeolite shows potential but necessitates a tailored approach based on the primary water purification goal. Chemical precipitation with AgNO3 and FeCl3 exhibits significant promise for chloride ion removal and coagulation. However, optimizing dosage and potentially incorporating filtration techniques like activated carbon is crucial for maximizing treatment effectiveness while preventing over-precipitation. Careful management of anion levels is essential, requiring adjustment of treatment protocols to ensure suitability for specific industrial uses.Tétel Korlátozottan hozzáférhető A Comprehensive Study on the Investigation of Microplastic Removal in Greywater Treatment Using Adsorbent Materials and CoagulantsHassanzad, Mohammad; Bodnár, Ildikó; DE--Műszaki KarThe issue of water shortage has emerged as a significant worldwide threat, leading to research on viable strategies for sustainable water utilization, such as the recycling of rainwater and wastewater [47]. Domestic wastewater is classified into two distinct categories: greywater and blackwater, with greywater comprising the majority of the discharge. Greywater, which is free of toilet residues and comprises domestic wastewater from sources such as baths, laundry, and bathroom basins, is distinguished by its minimal presence of organic and harmful pollutants [68]. On a daily basis, various detergents, personal care products, and clothing laundering significantly contribute to the MP content of domestic greywater that reaches wastewater treatment plants [35]. MP is an emerging pollutant that prompts alarm because of its pervasive presence in the environment. Wastewater treatment plants are a significant contributor to the presence of microplastics in the environment and water bodies owing to their limited ability to fully eliminate these tiny particles [28]. Therefore, it is critical to develop an innovative and effective treatment method for eliminating MP particles and other organic and inorganic pollutants from GW. Initially, synthetic greywater (SGW) was prepared using combining equal amounts of GW from laundry and bathrooms, each accounting for 50% of the content. Then LDPE-MP with a constant concentration of 0.1 g/L and fraction sizes of 50 to 500 µm spiked to the SGW. Two types of coagulants were used in this study: iron(III) chloride (ferric chloride) and Cationic Polyelectrolyte (ACEFLOC 80902). In the CFS method as a pretreatment technique, the pH, turbidity, and Zeta Potential measurements were conducted for all samples to find the optimum dosage and also MP removal efficiency in this phase. The aim of using coagulants was to understand the effects of coagulants on water quality and the potential for reducing the MP load in the pretreated samples. The pH was determined using a SenTix combination pH-electrode and the WTW Multi 3320 apparatus. Turbidity was measured using a WTW Turb 555IR light scattering photometer. The BOD5 was determined at a consistent incubation temperature of 20 °C using an OxiTop IS12 measuring head. TOC was calculated using the Shimadzu TOC-Vcpn total organic carbon analyzer. COD was assessed using NANOCOLOR COD test kits. The Zeta potential was measured using the Zetasizer Nano Z Zen 2600 instrument (Malvern Instruments Ltd., UK). Moreover, the study analyzed elemental concentrations of Raw SGW and treated water samples using an ICP-OES 5110 Vertical Dual View instrument and a double pass spray chamber. The efficiency of microplastic removal and water quality parameters in treated samples was examined using two columns made of the same adsorbent material across all column types. The GAC and NZ materials were used to prepare the columns. The materials ratio in columns were 100% GAC, 100% NZ, and 50% GAC and 50% NZ namely MIX filter medium. In total, we had 6 columns. To determine the efficacy of microplastic removal and water quality parameters, one column was devoted to the water quality parameters and one column to examine the MP removal. The treatment process involved determining the optimal dosage of coagulant, a coagulation-flocculation-sedimentation method, and a column-based filtration system. To investigate the effectiveness of a pre-treatment method using CFS in removing microplastics from water, MP removal efficiency was determined using a weight-based approach to determine the effectiveness of the CFS method. The coagulation process neutralized charges on particles, while flocculation amalgamated them for removal. The optimum concentration of coagulant was determined by monitoring the zeta potential and comparing it with the concentration of iron(III) chloride and Cationic Polyelectrolyte. To evaluate the MP removal efficiency of the adsorbent-column-based filtration system as a main treatment system, different techniques were used. Indeed, MP was identified using an optical microscope by counting the residual on the 0.45 µm filter paper, Raman spectroscopy to identify the polymer type by a light scattering technique, Scanning Electron Microscope (SEM) to examine the MP shape and surface morphology of adsorbent materials and their elemental composition, and a light microscope to evaluate the floc appearance and also MP counting. Results showed that the addition of LDPE-MPs to SGW increased turbidity, zeta potential, COD, and BOD5 values. The optimal dosage of FeCl3 was determined to separate unstable colloids and absorb MP particles. The optimal dosage resulted in a significant reduction in turbidity levels and pH levels. The optimum coagulant dosage for FeCl3 was 275 mg/L and for the combination effect, the optimum dosage for CPE was 15 mg/L in a constant amount of 275 mg/L FeCl3. The highest MP removal with the CFS method by FeCl3 was 16.60% and by the combination coagulants was 97.47%. In the first approach (Raw SGW-MP) the analysis of water quality parameters utilizing different filter media indicates varied effectiveness in pollutant removal. While all samples maintain pH levels within acceptable ranges for irrigation, the GAC filter showed superior turbidity reduction, though not meeting agricultural standards. Additionally, GAC and MIX filters demonstrated substantial reductions in TOC, COD, and BOD5, with the latter showing promising potential, particularly in organic pollutant removal. Moreover, elemental analysis revealed varying concentrations of trace elements, with all samples that can meet irrigation standards. The second approach revealed notable trends and effectiveness in pollutant removal. While the NZ filter medium shows a decrease in pH, other media maintain pH levels suitable for irrigation. All filter media exhibit a positive trend in ZP values, with NZ and MIX showing comparable or better outcomes. Turbidity decreases significantly across all media, with GAC demonstrating the most substantial reduction, meeting agricultural standards. Regarding TOC, GAC and MIX show significant improvements. In terms of COD and BOD5, GAC performs well for COD, while MIX excels for BOD5 compliance with EU regulations. Elemental analysis showed varied effects on trace elements, with all media meeting irrigation standards. The last approach showed consistent trends and efficacy in pollutant removal. Despite a slight decrease in pH for the NZ filter medium, all pH values fell within the recommended range for agricultural use. While NZ exhibited the highest EC value, all media showed improvement. Turbidity reduction was notable across all filters, particularly with GAC and MIX, meeting agricultural standards. GAC and MIX showed significant reductions in TOC, with GAC proving the most effective. For COD and BOD5, GAC demonstrated superior performance, meeting both EPA and EU guidelines. Moreover, Elemental analysis revealed trace element concentrations within acceptable limits for irrigation across all filter media. Overall, this part of the study highlights the effectiveness of different filter media in improving water quality for agricultural purposes, aligning with regulatory standards, particularly GAC and MIX filter media. In the case of MP removal efficiency, an optical microscope quantified MP particles on filter paper surfaces. Initially, the GAC filter medium showed an average of 10.67 MP particles/L, while the NZ filter medium displayed 32.00 MP particles/L, and the MIX filter medium exhibited 10.67 MP particles/L. This indicates comparable efficacy between GAC and MIX, primarily attributed to GAC's superior adsorption capacity. In the second approach with pre-coagulation using FeCl3, GAC had an average of 2.67 MP particles/L, while NZ had 10.67 MP particles/L, and MIX had 8.00 MP particles/L, again emphasizing GAC's effectiveness. In the third approach with pre-coagulation using CPE and FeCl3, no MP was detected on GAC, while NZ had 5.33 MP particles/L, and MIX had 2.67 MP particles/L, further highlighting GAC's superior MP removal capability.Tétel Korlátozottan hozzáférhető Assessing the Effectiveness of Noise Mitigation Measures in Reducing Road Traffic NoiseDarnakhleh, Katia S. A.; Kocsis, Dénes László; DE--Műszaki KarThis thesis examines the impact of transportation noise on health and the effectiveness of noise barriers, specifically focusing on a new barrier near the BMW Group Plant Debrecen. Constructed from Durisol panels with a concrete core, the barrier spans 975 meters and stands 5 meters high. Using advanced sound level meters and the Svantek SV 307A Noise Monitoring Station, noise levels were measured in compliance with Hungarian standards, accounting for traffic volume and other variables. Results indicated that noise exposure was highest near the highway but significantly reduced behind the barrier. The IMMI 2024 software was crucial in predicting noise levels and assessing the barrier's effectiveness, confirming its capacity to lower noise in residential areas while reflecting it back towards the highway. The thesis underscores the importance of effective noise reduction measures in urban areas to enhance public health and quality of life, recommending ongoing monitoring and further research into noise mitigation strategies.Tétel Korlátozottan hozzáférhető Application of mixture of coagulants in greywater treatmentAkpomie, Frederick; Bodnár, Ildikó; DE--Műszaki KarGreywater treatment and reuse are vital for sustainable water management, reducing strain on fresh water sources and pollution in water bodies. Hybrid coagulants are promising for water treatment, but their efficiency in greywater treatment remains understudied. A bench-scale study evaluated hybrid coagulation-filtration in treating sythentic bathroom greywater. The hybrid approach, using ferric chloride and lime, proved most effective, optimizing colloids removal and achieving high turbidity removal with a neutral pH. The study also tested real bathroom greywater, finding similar results though variations existed due to different sources. The hybrid coagulation-filtration process consistently met water reuse standards, outperforming single coagulant methods, highlighting its efficacy for decentralized greywater treatment.Tétel Korlátozottan hozzáférhető Investigation of zeta potential measurement and the utilization of MPT-2 Titrator unit in greywater treatmentKakish, Essa; Bodnár, Ildikó; DE--Műszaki KarAmid escalating water scarcity, the exploration of innovative solutions becomes imperative. This research delves into the potential of domestic greywater, a substantial component of household wastewater, constituting a promising resource. Focused on repurposing bathroom greywater (BGW), the study aims to optimize treatment processes through coagulation-flocculation, utilizing the MPT-2 titrator unit. The unit's role is pivotal in determining precise coagulant doses necessary to achieve the isoelectric point, while continuously monitoring the effect of chemical dosing, a crucial aspect in effective treatment. Comparative analyses involve the examination of two coagulants, Iron(III) chloride and Aluminium Sulphate, on synthetic and real BGW samples. The study explores differences between synthetic and real BGW compositions, elucidating diverse characteristics such as pH, turbidity, biological oxygen demand (BOD5), and Total Organic Carbon (TOC) values. Additionally, variations in certain samples necessitate higher coagulant concentrations for achieving optimal treatment conditions. Conclusively, the research underscores the significance of the MPT-2 unit in streamlining the determination of precise coagulant doses. This automated tool facilitates rapid preliminary analyses based on raw BGW quality, vital for devising tailored treatment strategies catering to the complexities of varied greywater compositions.Tétel Korlátozottan hozzáférhető Environmental impact comparative comparison of FMD and VP processesGuliyev, Khansuvar; Budai , Istvan; Viktoria , Mannheim; DE--Műszaki KarUsing 3D printing technology eliminates the extra expenditures involved with product development. Due to the high cost of creating traditional things for customers, selection of product has been a concern for industrialists. My thesis focuses on additive manufacturing, specifically additive manufacturing of polymer composites. I will explore the materials used for additive manufacturing and delve into the technology behind 3D printing. Additionally, I will examine 3D printing-based environmental devices and discuss the current trends and challenges in additive manufacturing. Furthermore, I will explore the potential of additive manufacturing and its impact on life cycle assessment. Lastly, I will evaluate the capabilities of the life cycle assessment software, GaBi 9.2 Education. My comparative results highlight several conclusions: • Both examined 3D processes (FDM and VP) have a minimal impact on the abiotic depletion of elements (ADPe) and contribute significantly to the abiotic depletion of fossil (ADPf) resources, putting strain on non-renewable resources. • The VP process generally has higher contributions to environmental impact categories, such as acidification potential (AP), global warming (planetary warming) potential (GWP), and human toxicity potential (HTP). • Both processes have a negligible influence on the depletion potential of the ozone layer (ODP).Tétel Korlátozottan hozzáférhető A magyarországi papíralapú csomagolási hulladékok gyűjtésének és hasznosításának helyzeteUlbrik, Tamás; Truzsi, Alexandra; Makó, Balázs; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarA kutatás során kapott eredmények hasznosak, mert a papírpiac jobb megértése elősegíti a cég kereskedelmi stratégiáját. A háttérben való történések, összefüggések és ezek felfedezésük releváns és hasznos információ a cégnek. Ezáltal gyorsabban lehet reagálni a folyamatokra, vagyis rövidtávú előrejelzéseket lehet tenni a piac változásaira, és a papírhulladék árainak az esetleges emelkedésére, csökkenésére és trendváltozásaira. A piaci előrejelzések alapján meg lehet határozni, hogy a cég mikor jár jobban az eladással vagy vétellel, vagy raktáraiba való felhalmozással. Ezáltal elérhető a profit maximalizálása, amely stabil gazdasági hátteret ad a cégeknek.