Journal of Environmental Engineering and Science

Journal Information
ISSN / EISSN: 14962551 / 1496256X
Published by: Thomas Telford Ltd.
Total articles ≅ 719

Latest articles in this journal

Mohamed Mohamed HadrixSearch for articles by this authorProcesses, Materials, Environment Laboratory (LPME), Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, Fez, MoroccoLaboratory MSI, Faculty of Sciences, Abdel Malek Essaadi University,, Khalid Draoui, et al.
Journal of Environmental Engineering and Science pp 1-11; https://doi.org/10.1680/jenes.22.00037

Abstract:
Pollution by dyes is one of the main pollutions of industrial effluents. This research examined Moroccan diatomite as a low-cost adsorbent to remove one of the dangerous dyes, malachite green (MG). Brunauer–Emmett–Teller analysis, scanning electron microscopy, pHpzc and X-ray diffraction were used to characterise diatomite. The studies were carried out at different levels of pH, diatomite masses and MG concentrations at a temperature of 25°C. Equilibrium, kinetics and thermodynamic characteristics were also studied. The results show that the diatomite consisted of an integrated and nearly circular sieve plate with many small ordered pores, giving it a high specific surface area of 17.36 m2/g. The ideal pH was found to be 7, with a saturation period of 90 min. The results indicate that MG removal increased accordingly as the pH increased and also as the adsorbent mass increased. The results of the isotherms showed that the Langmuir model is the most adequate, while the adsorption of MG is better characterised as monolayer adsorption. The maximum adsorption capacity obtained from the Langmuir model is about 22.17 mg/g at 25°C. Kinetic studies indicated the pseudo-second-order model as the most adequate model. It was also revealed that intraparticle diffusion is not the only rate-controlling step. From the thermodynamic data, it was concluded that the adsorption is endothermic – that is, the adsorption is more favourable at high temperatures. The research confirmed the applicability of diatomite as an effective and inexpensive adsorbent for removing hazardous materials.
Ahmed K Hassan, Zainab A Mahmoud
Journal of Environmental Engineering and Science pp 1-16; https://doi.org/10.1680/jenes.22.00025

Abstract:
This study relates to synthesis of bentonite-supported iron/copper nanoparticles through the biosynthesis method using eucalyptus plant leaf extract, which were then named E-Fe/[email protected] The synthesised E-Fe/[email protected] were examined by a set of experiments involving a heterogeneous Fenton-like process that removed direct blue 15 (DB15) dye from wastewater. The resultant E-Fe/[email protected] were characterised by scanning electron microscopy, Brunauer–Emmet–Teller analysis, zeta potential analysis, Fourier transform infrared spectroscopy and atomic force microscopy. The operating parameters in batch experiments were optimised using Box–Behnken design. These parameters were pH, hydrogen peroxide (H2O2) dosage, E-Fe/[email protected] dosage, initial DB15 concentration and temperature. The results showed that 94.32% of 57.5 mg/l DB15 was degraded within 60 min with an optimum hydrogen peroxide dosage of 7.5 mmol/l, an E-Fe/[email protected] dosage of 0.55 g/l, a pH of 3.5 and a temperature of 50°C. The kinetic study indicated that the DB15 degradation kinetics fit the second-order kinetic model, and the thermodynamic factors proved that the process is non-spontaneous, endothermic and endergonic with an activation energy E a of 62.961 kJ/mol.
Goverdhan Singh, Nisha, Anil Kumar, Parteek Prasher, Harish Mudila
Journal of Environmental Engineering and Science pp 1-14; https://doi.org/10.1680/jenes.22.00011

Abstract:
A variety of contaminants present in potable water, including heavy metals, cause numerous health hazards. Arsenic (As) is studied as one of the chief heavy elements hazardous to human beings and other categories of life. Arsenic as a natural constituent of the earth’s crust is present in mineral rocks, which are deposited through various natural processes. Moreover, arsenic is also added to groundwater anthropogenically through the burning of fossil fuels, arsenical agrochemicals, wood preservatives and so on. Arsenic (III) (AsIII) and arsenic (V) (AsV) are toxic inorganic forms in aqueous solution and are responsible for cancer, arsenicosis, vascular diseases and toxicity related to genes, cells, epidemiology and so on. In view of these problems, it is necessary to detect and decontaminate arsenic contamination in potable water. In this paper, brief descriptions are given of the most significant electrochemical methods, due to their advantages such as robustness, speed, accuracy and simplicity. Moreover, techniques such as differential pulse voltammetry, square-wave voltammetry (SWV), stripping chronopotentiometry, anodic stripping voltammetry and cyclic voltammetry (CV) have kept the electrochemical method as a diverse and advanced technique for the sensing process. Furthermore, details of the determination and decontamination of arsenic in potable water through an electrochemical process with a particular focus on SWV and CV are discussed.
Sanaz Lakestani, Ibrahim Cakir, Hasan Tahsin Gozdas, Isa Yildiz, Abdullah Demirhan
Journal of Environmental Engineering and Science pp 1-7; https://doi.org/10.1680/jenes.22.00002

Abstract:
Maintaining high indoor air quality in hospitals is important for protecting the health of both personnel and patients. In this study, the results of air quality monitoring carried out in the intensive care unit of a hospital in Bolu, Turkey, are discussed. Air disinfection devices were used to reduce the concentrations of bacteria. A four-week sampling program was implemented. In the first and the last weeks of the sampling, the disinfection devices were turned off, while in the second and third weeks they were turned on. Bioaerosols were collected and their indoor levels were determined by counting all plate colonies and bacterial types were identified by MALDI-TOF-MS. The highest levels of bacteria were measured in the mornings and before the air disinfection devices were turned on. Doctors do their rounds at approximately 9-10 o’clock. The dominant bacteria in the air samples examined were Staphylococcus hominis, Micrococcus luteus, Staphylococcus capitis, Staphylococcus epidermidis, Corynebacterium afermentans, and Staphylococcus haemolyticus. The results showed that the air disinfection devices were effective in decreasing the concentration of microorganisms between 83.4%- 55% in the intensive care unit, which is very important for the healthcare staff and patients, especially during pandemics.
Samuel Wiafe, Sarah Fanny Hackman Duncan, Boakye Ebenezer, Samuel Yeboah Baako
Journal of Environmental Engineering and Science pp 1-7; https://doi.org/10.1680/jenes.22.00020

Abstract:
The remediation of heavy metals from contaminated sites by the application of phytoextraction is proving to be efficient and cost-effective. A pot experiment was conducted to ascertain the effect of soil types (sand, loam and clay) in the remediation of copper (Cu), chromium (Cr) and mercury (Hg) using Phragmites australis. The results obtained throughout 60 days of plant growth showed that the copper absorption in the roots of the plant in sandy, loamy and clayey soils was 47, 79.1 and 96 mg/kg, respectively. Chromium absorption in the roots of the plant in sandy, loamy and clayey soils was 136, 180 and 353 mg/kg, respectively, while mercury absorption in sand, loam and clay was 11.7, 14.8 and 19.3 mg/kg. The translocation factor for all metals in the three soil types was less than 1; however, the bioaccumulation factor in all cases was more than 1. The study concluded that the accumulation of chromium in the tissues of the plant was more pronounced than those of copper and mercury. Clayey soil proved to be the favourable soil required for the effective remediation of the metals into the tissues of a plant.
Ruqaya Al-Syabi, Azizallah Izady, Mahad Said Baawain, Abdullah Al-Mamun, Mingjie Chen
Journal of Environmental Engineering and Science pp 1-14; https://doi.org/10.1680/jenes.22.00016

Abstract:
Management of municipal solid waste leachate has become an urgent environmental problem in many countries due to the high growth of population and consumption trends. Advanced oxidation processes (AOPs) are efficient methods to treat leachate because of their high ability to reduce unpleasant parameters. Although the simultaneous application of different AOPs methods is more effective than a single process, the simultaneous application of AOPs for the treatment of municipal solid waste leachate has received little attention. To fill this knowledge gap, this study presents the simultaneous application of AOPs methods to treat municipal solid waste leachate. The efficiency of AOPs was studied in terms of organic compounds such as chemical oxygen demand (COD) and total organic carbon (TOC). Leachate samples were collected from the Barka landfill, which is located in the northeast of Oman. Four combinations of applied AOPs methods (e.g. ozone (O3), hydrogen peroxide (H2O2), and ultraviolet (UV)) in this study resulted in the order of H2O2/O3/UV > H2O2/O3 > O3/UV3 > H2O2/UV according to the COD removal efficiency. Combining these AOPs methods resulted in about 1.5 times increase in COD removal (56.62%) and 1.9 times increase in TOC removal (39.34%) compared to the individual applications.
John Philia, Widayat Widayat, Sulardjaka Sulardjaka
Journal of Environmental Engineering and Science pp 1-8; https://doi.org/10.1680/jenes.21.00082

Abstract:
Organic compounds like dyes and heavy metal ions are common pollutants in wastewater that have become a global problem. Adsorption has proven to be a successful technique in removing organic species such as methylene blue. Geothermal solid waste has the potential to be used as an adsorbent due to its silica content. Silica compound in the geothermal waste is the potential to be developed as porous material. Aluminum hydroxide and geothermal solid waste were added to the aqueous alkali (NaOH) in the continuous stirred tank reactor, then resulted an amorphous mesoporous material of the natrolite phase. The performance of the geoadsorbent was evaluated through the removal of various concentrations of methylene blue, and isotherm adsorption models evaluated the data. The adsorption mechanisms of the MB removal by geoadsorbent shown by FT-IR spectra are electrostatic attraction and hydrogen-bond formations. The geoadsorbent can remove methylene blue up to 84.449%, which the initial concentration of MB is highly dependent on adsorption. The Langmuir isotherm model provides the most accurate representation of methylene blue adsorption as a result of the physical process. with a correlation coefficient of 0.971.
M Bourouiss, M Djebbar, F Djafri
Journal of Environmental Engineering and Science pp 1-9; https://doi.org/10.1680/jenes.21.00051

Abstract:
Removal of the dye Methylene Blue from water at different concentrations, adsorbent pH and times was investigated. The natural clay was treated by cation exchange, which was confirmed by XRD and IR analyzes. Experimental results have shown that the high pH promotes adsorption. The adsorption isotherms are described by the equation of Langmuir and Freundlich isotherms. It is important to note that the quantity of CaO corresponding to calcite is higher in natural clay (9.7 % by weight) compared to Na-montmorillonite fraction (2.01% weight). It clearly shows that the clay dhkl spacing increased from d = 13.58 to d = 17 Å, which could be attributed to natural clay and Na-montmorillonite which confirms good clay purification. The maximum capacity of dyes adsorbed on Natural clay and Na-monmorillonite (Qmax) are (142.85 to 250 mg g−1) and (80 to 277.77 mg g−1) respectively. The correlation coefficients R2 = 0.99 of the Freundlich and Langmuir model for natural clays and Na-montmorillonte have the same values this indicates that the two models are best for the adsorption of dye Methylene Blue on natural clay and Na -montmorillonite.
Emmanuel O Mogusu, Cornelius Mushumbusi, Gileard Minja, Didas Kimaro
Journal of Environmental Engineering and Science pp 1-12; https://doi.org/10.1680/jenes.22.00003

Abstract:
The global demand for plastics has increased majorly because of their versatility, light weight, strength and cost–effectiveness. Africa is ranked top in mismanagement of plastic waste, resulting in the plastic problem in the environment. Nevertheless, plastics produce microplastics through degradation and fragmentation of plastic debris largely from anthropogenic sources. Microplastics have become ubiquitous in the natural environment, and the terrestrial environment is the major source. The propensity of microplastics to adsorb and concentrate persistent organic pollutants (POPs) provides potential health effects in the different trophic levels of organisms in both aquatic and territorial environments. Thus, the fate of microplastics is increasingly becoming a global concern. Despite the numerous global studies on the impact of microplastics in the environment, there are insufficient data available on the occurrence and distribution of microplastics and associated health effects in aquatic ecosystems in Africa. The reviewed research articles from 2000 to 2021 provide a summary of the current knowledge on the occurrence and distribution of microplastics, analytical approaches used to detect and quantify microplastics, associated health effects and mitigation measures through government policy to ban plastic use in Africa. The findings presented provide a platform for future research to focus on the associated effects of adsorbed and concentrated POPs on microplastics in aquatic environments in Africa. With the evidence presented, policymakers will make more informed decisions on the future of plastics in Africa. The authors recommend improving information and expanding knowledge through research on the fate and potential ecological impact of microplastics in aquatic environments in Africa.
Gaber S AbdelGhany, Ebrahiem Esmail Ebrahiem, Hamdy F M Mohamed, , Nabila Shehata
Journal of Environmental Engineering and Science, Volume 17, pp 53-66; https://doi.org/10.1680/jenes.21.00002

Abstract:
Rice hulls, a harmful biowaste, were used to produce nanosized activated carbon (RHAC) by combustion and phosphoric acid treatment. The developed RHAC was characterised using various structural and morphological techniques (scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy and nitrogen (N2) adsorption). The prepared RHAC was used to remove heavy metal ions (iron (III) (Fe3+) and chromium (VI) (Cr6+)) by using the adsorption mechanism. Adsorption parameters, such as contact time, dose and initial concentration of the heavy metal ions, were investigated. Five adsorption models (two and three parameters) were studied. Also, the adsorption kinetics through the intraparticle diffusion model was applied. RHAC showed adsorption capacities of 47.00 and 45.00 mg/g for iron (III) and chromium (VI), respectively. The findings recommend using RHAC as a low-cost and eco-friendly adsorbent for metal ion removal and water-treatment applications.
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