UDOM IR :: Browsing by Author "Bakari, Ramadhani"

Browsing by Author "Bakari, Ramadhani"

Now showing 1 - 12 of 12

Biotransformation of 1,4-Dioxane by the Use of Bacteria in the Soil
(Springer Nature Singapore, 2023) Miraji, Hossein; Ripanda, Asha; Bakari, Ramadhani; Sarma, Hemen
Background: 1,4-Dioxane, also known as dioxane, is a water-miscible synthetic industrial chemical used as a stabilizer for chlorinated solvents and feedstock chemical for a wide range of industrial consumer products. It is a heterocyclic organic ether that, through consumer products and industrial, municipal, and domestic effluents, can get into the environment. Due to its volatility and miscibility, short-term exposure results in irritation of the nose, eyes, and throat, while excessive amounts damage the liver and kidney. Long-term exposure results in carcinogenicity to humans that may associate with death. Statement of problem: 1,4-Dioxane is nonbiodegradable in nature and hence persists in the environmental compartments; some methods such as UV peroxide oxidation, direct UV photolysis, and activated carbon adsorption were reported to be effective in the removal of dioxane in the environment. Yet, their adaptation challenges such as complex matrices, running costs, mass balance, and stoichiometry limitations hinder their efficiency. Finding: Mimicking natural or integrated techniques such as bacteriological transformation of dioxane via aerobic, anaerobic, microcosm, integrated microbial community, and co-metabolic techniques is among the robust eco-friendly technologies against these limitations. Soil matrix offers enormous microbial consortium for nature-based remediation of dioxane with high turnup than single microbial strains. Since bacteriological remediation offers adoptable, flexible, and quick implementation strategies that minimizes the use of synthetic chemicals, its fundamental understanding will be inevitable. Conclusion: Nature-based remediation of dioxane is an undoubtable future since apart from the natural occurrence of soil bacteria responsible for degradation, their natural adaptation flexibility, energy conservation, and release of harmless by-products without formation of secondary synergic harmful contaminants present a relatively affordable technique.
Catalytic supercritical water gasification of biomass waste using iron-doped alkaline earth catalysts
(Springer, 2022) Bakari, Ramadhani; Xiao Huang, Thomas Kivevele; Jande, Yusufu A. C.
The objective of this study is to optimise the process of supercritical water gasification of rice husk biomass utilising a low-cost catalyst made from alkaline-earth materials. The interactions between catalyst loading and Fe content on gasification yield were investigated using response surface methodology. The catalyst characterisation findings revealed that the catalysts’ predominant reactive site is on iron oxide, calcium ferrite, and calcium oxide. Under all the conditions tested, the manufactured catalyst was highly active in promoting char gasification, gas volume, and gasification efficiency whilst the tar yield was substantially elevated. The maximum gasification efficiency of 69.57%, gas yield of 402.8 mL/g biomass, char yield 24.68 wt%, and gravimetric tar yield of 57.5 mg/g were obtained under the catalytic conditions of 15% catalyst loading with 5%Fe/limestone, 492 °C, 120-min residence time, and 9.5 wt% feed concentrations. Thus, the manufactured catalyst showed a potential for optimising gasification outputs.
Data from the batch adsorption of ciprofloxacin and lamivudine from synthetic solution using jamun seed ( Syzygium cumini ) biochar: Response surface methodology (RSM) optimization
(Elsevier, 2023) Ripanda, Asha; Rwiza, Mwemezi J.; Nyanza, Elias Charles; Bakari, Ramadhani; Miraji, Hossein; Njau, Karoli N.; Vuai, Said Ali Hamad; Machunda, Revocatus L.
This dataset expresses the experimental data on the batch adsorption of ciprofloxacin and lamivudine from synthetic solution using jamun seed (JS) (Syzygium cumini) biochar. Independent variables including concentration of pollutants (10-500 ppm), contact time (30–300 min), adsorbent dosage (1-1000 mg), pH (1-14) and adsorbent calcination temperature (250,300, 600 and 750 °C) were studied and optimized using Response Surface Methodology (RSM). Empirical models were developed to predict the maximum removal efficiency of ciprofloxacin and lamivudine, and the results were compared with the experimental data. The removal of polutants was more influenced by concentration, followed by adsorbent dosagage, pH, and contact time and the maximum removal reached 90%.
Ecological consequences of microplastic pollution in sub-Saharan Africa aquatic ecosystems: An implication to environmental health
(Elsevier BV, 2024) Moto, Edward; Hossein, Miraji; Bakari, Ramadhani; Mateso, Alfred Said; Selemani, Juma Rajabu; Nkrumah, Salma; Ripanda, Asha; Rwiza, Mwemezi J.; Nyanza, Elias Charles; Machunda, Revocatus L.
Microplastic pollution (MPs) emerged as a significant environmental concern due to its persistent nature. These MPs particles endure in waters, soils, and even the atmosphere, posing potential threats to the entire ecosystem. Aquatic organisms are at risk of ingesting MPs, leading to accumulation in tissues, ultimately affecting entire food chain. This study aims to provide an overview of sources of MPs, distribution, and potential environmental impacts. MPs have been documented in various substances such as bottled water, salts, seafood, and even the air. However, the full extent of the health consequences on human exposure remains uncertain. Therefore, it is imperative that we draw public attention to the presence of these pollutants in the environment. To mitigate adverse effects of MPs, reducing plastic consumption, implementing improved waste management practices, and advocating sustainable behaviors are essential for well-being of natural ecosystems and the health human populations.
Ecological consequences of microplastic pollution in sub-Saharan Africa aquatic ecosystems: An implication to environmental health
(Elsevier BV, 2024) Moto, Edward; Hossein, Miraji; Bakari, Ramadhani; Mateso, Alfred Said; Selemani, Juma Rajabu; Nkrumah, Salma; Ripanda, Asha; Rwiza, Mwemezi J.; Nyanza, Elias Charles; Machunda, Revocatus L.
Microplastic pollution (MPs) emerged as a significant environmental concern due to its persistent nature. These MPs particles endure in waters, soils, and even the atmosphere, posing potential threats to the entire ecosystem. Aquatic organisms are at risk of ingesting MPs, leading to accumulation in tissues, ultimately affecting entire food chain. This study aims to provide an overview of sources of MPs, distribution, and potential environmental impacts. MPs have been documented in various substances such as bottled water, salts, seafood, and even the air. However, the full extent of the health consequences on human exposure remains uncertain. Therefore, it is imperative that we draw public attention to the presence of these pollutants in the environment. To mitigate adverse effects of MPs, reducing plastic consumption, implementing improved waste management practices, and advocating sustainable behaviors are essential for well-being of natural ecosystems and the health human populations.
Exploring eco-friendly approaches for mitigating pharmaceutical and personal care products in aquatic ecosystems: a sustainability assessment
(Elsevier, 2023) Hossein, Miraji; Asha, Ripanda; Bakari, Ramadhani; Islam, Nazim Forid; Jiang, Guangming; Sarma, Hemen
Global water scarcity is exacerbated by climate change, population growth, and water pollution. Over half of the world's population will be affected by water shortages for at least a month annually by 2050 due to a lack of clean water sources. Even though recycling wastewater helps meet the growing demand, new pollutants, including pharmaceuticals and personal care products (PPCPs), pose a health threat since conventional methods cannot remove them and their environmental monitoring regulations are yet in place. Therefore, the current review aims to investigate and propose eco-friendly technologies for removing PPCPs from wastewater and their implementation strategies for ecosystem safety. Findings indicated the absence of a single wastewater treatment technology that can remove all PPCPs in a single operation. Instead, biotechnological methods are one of the alternatives that can remove PPCPs from aquatic environments. In this context, community involvement and knowledge transfer are identified keys to clean water resources' long-term sustainability.
Optimization of solvothermal liquefaction of water hyacinth over PTFE-acid mediated kaolin catalyst for enhanced biocrude production
(Elsevier BV, 2024) Kariim, Ishaq; Bakari, Ramadhani; Waidi, Yusuf Olatunji; Kazmi, Wajahat Waheed; Malla, Sunita Kumari; Park, Ji-Yeon; Syed, Muhammad Wasi; Bhatti, Ali Hassan; Omer, Ahmed; Swai, Hulda; Lee, In-Gu; Kivevele, Thomas
The invasive nature of water hyacinth and the need for renewable energy sources have necessitated this research. Catalyst development through enhanced pore structure and process parameters optimization are requirements for effective mass transport during the biomass valorization and improved biocrude formation during solvothermal liquefaction process. In this present study, the effects of temperature (250–340 °C), residence time (10–20 min) and catalyst loading (10–13 wt%) on biocrude, biochar, gas yield, and biomass conversion were optimized using a Box-Behnken experimental design. The developed catalyst through the application of polytetrafluoroethylene (PTFE) for pore structure enhancement was characterized using SEM, BET and XRD techniques. The process optimization found maximum biocrude yield (32.0 wt%), minimum biochar yield (19.4 wt%) and maximum conversion efficiency (80.6%) at 340 °C, 20 min residence time, and 13 wt% catalyst loading. The GC-MS result of the biocrude produced at the optimum conditions (13 wt% catalyst loading) consists of ketones (32.2%), acids (22.3%) and had 65.2% carbon, 7.3% hydrogen, HHV of 29.4 MJ/kg and H/C ratio of 1.34 while an increment in catalyst loading of 20 wt% enhanced the overall biocrude properties with HHV of 35.50 MJ/kg. This result depicts the suitability of the PTFE modified acid treated kaolin for high quality biocrude production through valorization of water hyacinth into a candidate for renewable energy material.
Optimizing ciprofloxacin removal from water using jamun seed (Syzygium cumini) biochar: A sustainable approach for ecological protection
(Elsevier BV, 2024) Ripanda, Asha; Rwiza, Mwemezi J.; Nyanza, Elias Charles; Bih, Linda Numph; Hossein, Miraji; Bakari, Ramadhani; Sigh, Somit Kumar; Reddy, Giridhar; Ravikumar, C.R.; Murthy, H.C. Ananda; Njau, Karoli N.; Vuai, Said Ali Hamad; Machunda, Revocatus L.
Scientific interest in antimicrobial pollutants, such as ciprofloxacin, has increased. Due to spread of antibiotic-resistant bacteria, resistance genes, and their dissemination to the environment. Therefore, their remediation is necessary to ensure ecological sustainability. The current study aimed to optimise the removal of ciprofloxacin from synthetic water using jamun seed (JS) (Syzygium cumini) biochar using a response surface methodology (RSM). Result indicates ciprofloxacin elimination efficiency ranged between 32.46 and 94.95%, indicating the material can be improved and used for remediation of organics. The residual standard error of 4.4% were found for the predicted model, implying that the model is credible and can be used to predict future experimental findings. The R-squarred value for the improved Langmuir model's R2 is 0.9681 which is inclose agreement with the Freundlich isotherm, R2 0.9757. Therefore, JS biochar could be utilized for the remediation of ciprofloxacin from contaminated water and wastewater for ecological safety and sustainability.
Optimizing ciprofloxacin removal from water using jamun seed (Syzygium cumini) biochar: A sustainable approach for ecological protection
(Elsevier BV, 2024) Ripanda, Asha; Rwiza, Mwemezi J.; Nyanza, Elias Charles; Bih, Linda Numph; Hossein, Miraji; Bakari, Ramadhani; Sigh, Somit Kumar; Reddy, Giridhar; Ravikumar, C.R.; Murthy, H.C. Ananda; Njau, Karoli N.; Vuai, Said Ali Hamad; Machunda, Revocatus L.
Scientific interest in antimicrobial pollutants, such as ciprofloxacin, has increased. Due to spread of antibiotic-resistant bacteria, resistance genes, and their dissemination to the environment. Therefore, their remediation is necessary to ensure ecological sustainability. The current study aimed to optimise the removal of ciprofloxacin from synthetic water using jamun seed (JS) (Syzygium cumini) biochar using a response surface methodology (RSM). Result indicates ciprofloxacin elimination efficiency ranged between 32.46 and 94.95%, indicating the material can be improved and used for remediation of organics. The residual standard error of 4.4% were found for the predicted model, implying that the model is credible and can be used to predict future experimental findings. The R-squarred value for the improved Langmuir model's R2 is 0.9681 which is inclose agreement with the Freundlich isotherm, R2 0.9757. Therefore, JS biochar could be utilized for the remediation of ciprofloxacin from contaminated water and wastewater for ecological safety and sustainability.
Removal of lamivudine from synthetic solution using jamun seed (Syzygium cumini) biochar adsorbent
(Elsevier, 2023) Ripanda, Asha; Rwiza, Mwemezi J.; Nyanza, Elias Charles; Bakari, Ramadhani; Miraji, Hossein; Njau, Karoli N.; Vuai, Said Ali Hamad; Machunda, Revocatus L.
Antiviral drugs such as lamivudine have been globally identified in the environment and marked as emerging pollutants of concern due to their bioactive extremity. Following therapeutic uses, approximately 70% of the oral dose of lamivudine is eliminated renally as the parent drug. Concerns has been raised for neighbouring aquatic bodies due to effluent produced from production plants containing high concentrations of antiviral drugs. Antiviral drugs, such as lamivudine, are extremely bioactive, prompting interest in their urgent removal from the environment. The purpose of the present study was to optimize the removal of lamivudine from the synthetic solution using jamun seed (JS) (Syzygium cumini) biochar. The influence of sorption parameters such as pH, lamivudine concentration, adsorbent dosage, contact time, and calcination temperatures on the removal of lamivudine was investigated and optimized using a response surface methodology (SRM) based on optimal design. The results indicated that, a quadratic model best fits data with a model regression coefficient R2, adjusted R2, and predicted R2 of 0.9934, 0.9761 and 0.8340, respectively. The JS biochar calcined at 750°C, at pH 8, initial lamivudine concentration of 10 ppm and contact time of 30 min indicated a maximum experimental removal efficiency of 84.9%. The residual standard error (RSE) value was 3.5% implying that the model was reliable. Isotherm data for the adsorption of lamivudine on JS biochar followed the Freundlich isotherm, with an R2 value of 0.9977 while R2 for the modified Langmuir model was 0.9852. These findings indicated that JS biochar is potentially useful for removal of lamivudine, and other organics from contaminated water and wastewater effluents. Therefore, this study presents an environmentally friendly remedy against lamivudine for a healthier ecology
Removal of lamivudine from synthetic solution using jamun seed (Syzygium cumini) biochar adsorbent
(Elsevier BV, 2023) Ripanda, Asha; Rwiza, Mwemezi J.; Nyanza, Elias Charles; Bakari, Ramadhani; Miraji, Hossein; Njau, Karoli N.; Vuai, Said Ali Hamad; Machunda, Revocatus L.
Antiviral drugs such as lamivudine have been globally identified in the environment and marked as emerging pollutants of concern due to their bioactive extremity. Following therapeutic uses, approximately 70% of the oral dose of lamivudine is eliminated renally as the parent drug. Concerns has been raised for neighbouring aquatic bodies due to effluent produced from production plants containing high concentrations of antiviral drugs. Antiviral drugs, such as lamivudine, are extremely bioactive, prompting interest in their urgent removal from the environment. The purpose of the present study was to optimize the removal of lamivudine from the synthetic solution using jamun seed (JS) (Syzygium cumini) biochar. The influence of sorption parameters such as pH, lamivudine concentration, adsorbent dosage, contact time, and calcination temperatures on the removal of lamivudine was investigated and optimized using a response surface methodology (SRM) based on optimal design. The results indicated that, a quadratic model best fits data with a model regression coefficient R2, adjusted R2, and predicted R2 of 0.9934, 0.9761 and 0.8340, respectively. The JS biochar calcined at 750 °C, at pH 8, initial lamivudine concentration of 10 ppm and contact time of 30 min indicated a maximum experimental removal efficiency of 84.9%. The residual standard error (RSE) value was 3.5% implying that the model was reliable. Isotherm data for the adsorption of lamivudine on JS biochar followed the Freundlich isotherm, with an R2 value of 0.9977 while R2 for the modified Langmuir model was 0.9852. These findings indicated that JS biochar is potentially useful for removal of lamivudine, and other organics from contaminated water and wastewater effluents. Therefore, this study presents an environmentally friendly remedy against lamivudine for a healthier ecology.
Sub- and supercritical water gasification of rice husk: parametric optimization using the I-optimality criterion
(American Chemical Society, 2021) Bakari, Ramadhani; Kivevele, Thomas; Huang, Xiao; Jande, Yusufu A. C.
In this study, rice husk biomass was gasified under sub- and supercritical water conditions in an autoclave reactor. The effect of temperature (350–500 °C), residence time (30–120 min), and feed concentration (3–10 wt %) was experimentally studied using the response surface methodology in relation to the yield of gasification products. The quadratic models have been suggested for both responses. Based on the models, the quantitative relationship between various operational conditions and the responses will reliably forecast the experimental outcomes. The findings revealed that higher temperatures, longer residence times, and lower feed concentrations favored high gas yields. The lowest tar yield obtained was 2.98 wt %, while the highest gasification efficiency and gas volume attained were 64.27% and 423 mL/g, respectively. The ANOVA test showed that the order of the effects of the factors on all responses except gravimetric tar yield follows temperature > feed concentration > residence time. The gravimetric tar yield followed a different trend: temperature > residence time > feed concentration. The results revealed that SCW gasification could provide an effective mechanism for transforming the energy content of RH into a substantial fuel product.

Browsing by Author "Bakari, Ramadhani"

Results Per Page

Sort Options