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Environmental Technology

Cécile Diliberto, Eric Meux, Sébastien Diliberto, Laetitia Garoux, Eric Marcadier, Laurent Rizet, André Lecomte
Municipal solid waste incineration (MSWI) fly ashes are hazardous waste since they contain organic pollutants, heavy metals and an important amount of various soluble salts. However their chemical composition is interesting for their valorisation in cement production. The objective of this paper is to assess the possibility of MSWI fly ashes reuse as cement raw meal, after pre-treatment, at a laboratory scale. The environmental impact has also been studied (analyses of the metals, of dioxins and furans and leaching tests on clinker produced)...
September 20, 2018: Environmental Technology
Md T Noori, G D Bhowmick, B R Tiwari, I Das, M M Ghangrekar, C K Mukherjee
Waste generation from healthcare facilities now has become a concerning issue as it contains plastic and metals. Medicine wrappers are one of the major portion of healthcare solid waste, which impel intensive solid waste management practice due to less possibilities of deriving by-products. However, it can be recycled and used as electrode material in microbial fuel cells (MFCs). An electrode material for application in MFCs is a crucial component, which governs total fabrication cost as well as power recovery, thus a cost-effective, stable and durable electrode is essential...
September 19, 2018: Environmental Technology
Mohammad Ali Rezvani, Maryam Shaterian, Masomeh Aghmasheh
To preparation of ultra-clean gasoline fuel, a new amphiphilic nanocomposite (TBA-SiWMn@PVA) has been successfully synthesized by supporting sandwich-type silicotungstate polyoxometalate ((n-C4 H9 )4 N)7 H5 Si2 W18 Mn4 O68 (TBA-SiWMn) on polyvinylalcohol (PVA) as an efficient catalyst for catalytic oxidative desulfurization (CODS) of gasoline. The synthesized materials were characterized by means of elemental analysis, 113 Mn NMR, 29 Si NMR, XRD, SEM, FT-IR and UV-vis techniques. The catalytic activity of TBA-SiWMn@PVA nanocomposite was tested on real gasoline in the presence of CH3 COOH/H2 O2 as an oxidant and the results were compared with model sulfur compounds at the same conditions...
September 18, 2018: Environmental Technology
E Coutinho de Paula, P V Martins, I C M Ferreira, M C S Amaral
Recycling of end-of-life polyamide-based thin film composite (TFC) membranes is gaining interest in academic and industrial contexts. The effects of chlorine exposure on the performance of polyamide membranes result in an increase in membrane permeability, whereas the solute rejection decreases. Therefore, the controlled chemical conversion of old reverse osmosis (RO) membranes have been reported by some previous papers. The objectives of this study were to assess recycling of old nanofiltration (NF) membrane, to assess the performance of the recycled membranes for a river water treatment application, and to conduct preliminary cost evaluations...
September 18, 2018: Environmental Technology
A Sakthi Thesai, S Rajakumar, P M Ayyasamy
The removal of fluoride is essential for water contaminated with fluoride before being utilized since the unsafe concentration of fluoride with respect to the permissible limits. In the present study, there are 61 bacterial strains belonging to fluoride tolerance were isolated from the contaminated soil of Dharmapuri District, Tamil Nadu, India and they were evaluated for different characterization. Among the strains isolated, the strain PN4 showed a high tolerance to fluoride ranging from 500 to 2500 ppm under different stress conditions...
September 14, 2018: Environmental Technology
Sameena Begum, Shruti Ahuja, Gangagni Rao Anupoju, Devender Kumar Ahuja, Vijayalakshmi Arelli, Sudharshan Juntupally
The present research work is aimed at providing an economically feasible solution for the farmers to exploit the mixed organic wastes (MOW) as resources for the generation of biogas based electrical power and utilize the same for irrigation purpose to reduce the dependence on electricity board. A full scale biomethanation plant has been installed based on anaerobic gas lift reactor (AGR) technology to analyze, understand the operational parameters of anaerobic digestion and assess the performance of a high rate biomethanation plant by co digesting the MOW such as such as poultry litter (PL), cattle manure (CM) and napier grass (NG) at ambient temperature...
September 13, 2018: Environmental Technology
Tatiane Cristina Dal Bosco, Roger Nabeyama Michels, Janksyn Bertozzi, Ivan Taiatele Junior, Elizabeth Mie Hashimoto
One of the main analytical variable to indicate the evolution and the phases of the composting process is temperature, whose constant monitoring is fundamental for decision making. However, studies usually perform collection of temperature data with a daily frequency due to the operational difficulty in obtaining this information from manually collected samples. Thus, the aim of this study was to determine the ideal frequency of temperature data collection in composting layers. Eight composting layers containing tree prunings + domestic organic residues were installed and four temperature sensors were installed in each layer...
September 12, 2018: Environmental Technology
Gökben Başaran Kankılıç, Ayşegül Ülkü Metin, Yaşar Aluç
Phenol removal from environmental solutions has attracted much attention due to phenol's high toxicity, even at low concentrations. This study aims to reveal the phenol biodegradation capacity of Scenedesmus regularis. Batch system parameters (pH, amount of algal cell, phenol concentration) on biodegradation were examined. After 24 h of treatment, 92.16, 94.50, 96.20, 80.53, 65.32, 52 and 40% of phenol were removed by Scenedesmus regularis in aqueous solutions containing 5, 10, 15, 20, 30, 40 and 50 mg/L of phenol, respectively...
September 12, 2018: Environmental Technology
Lisa Zaouk, Anthony Massé, Patrick Bourseau, Samir Taha, Murielle Rabiller-Baudry, Sébastien Jubeau, Benoit Teychené, Jérémy Pruvost, Pascal Jaouen
The red microalga Porphyridium cruentum is exploited industrially for its exopolysaccharides (EPS) and pigments production. EPS produced by P. cruentum are partially released and dissolved into the surrounding environment, they can be recovered from the culture medium after removing the cells. This paper presents a parametric study of the ultrafiltration of EPS solutions on organic membrane. The EPS solutions were produced in conditions representative of an industrial production. They were filtered at lab-scale on a flat, PES 50 kDa MWCO membrane in a complete recirculation mode of permeate and retentate...
September 12, 2018: Environmental Technology
Qian Xu, Sylvie Renault, Doug Goltz, Qiuyan Yuan
In this study, cattail (Typha latifolia) was used to remove Na+ and Cl- from polluted soil (PS) in a solid waste open dumping site. Hydroponic system was also evaluated to remove Na+ and Cl- from landfill leachate. The results indicated that the cattail grown in PS had higher biomass yield of 44.4 ± 3.29 g compared to that of control (35.3 ± 4.28 g). Nitrogen and phosphorous contents of cattails grown in PS were also higher than that of control plants, and the electrical conductivity of PS significantly decreased from 245 ± 1...
September 10, 2018: Environmental Technology
Tingyu Yang, Yu Wang, Yanan Wu, Jiexiu Zhai, Ling Cong, Guoxin Yan, Zhenming Zhang, Chunyi Li
In Beijing, particulate matter (PM) in the atmosphere, especially PM2.5 and PM10 , have attracted public attention because of its adverse effects. A series of studies have investigated the sources and spatial-temporal variation of PM. Wetland has been reported to own the capacity of resolving air problem. To examine the characteristics of the particulate matter in wetlands, the diurnal variation of PM2.5 and PM10 concentrations with respect to two heights (i.e., 1.5 m and 10 m, respectively) and three meteorological factors (i...
September 10, 2018: Environmental Technology
Vasiliki I Syngouna, Georgios I Giannadakis, Constantinos V Chrysikopoulos
Graphene oxide (GO) nanomaterials are used extensively in a wide range of commercial applications. With GO production growing rapidly, it is expected that GO eventually could reach sensitive environmental systems, including subsurface formations, where montmorillonite, one of the most common minerals, is in abundance. This study examines the interaction of GO with quartz sand and montmorillonite (MMT) colloids at pH = 7, ionic strength IS  = 2 mM, and 25°C, under dynamic conditions. Moreover, the effect of pH on MMT kinetic attachment onto quartz sand was investigated...
September 10, 2018: Environmental Technology
Larissa D Bortoli, Soraya M Palácio, Eliane Hermes, Dilcemara C Zenatti, Márcia T Veit, Élvio A Campos
This study evaluated the removal of silver nanoparticles (AgNPs), coated with different stabilizers, from aqueous media using the electrocoagulation technique. The AgNPs dispersions were synthesized by chemical reduction with silver nitrate as precursor, sodium borohydride as reducing agent and sodium carboxymethylcellulose (CMC), polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP) as stabilizers with initial concentrations of 1 and 3% (w/v). The dispersions were named AgNPs-CMC1, AgNPs-CMC3, AgNPs-PVA1, AgNPs-PVA3, AgNPs-PVP1, and AgNPs-PVP3...
September 10, 2018: Environmental Technology
Jacqueline Ferandin Honorio, Márcia Teresinha Veit, Pedro Yahico Ramos Suzaki, Priscila Ferri Coldebella, Eliane Sloboda Rigobello, Célia Regina Granhen Tavares
In the present study, the use of the rice husk biomass as an alternative biosorbent for treating the estrone, 17β-estradiol, and estriol hormones in monocomponent and multicomponent systems was investigated. The high-performance liquid chromatography technique (HPLC-UV) was applied in order to quantify the hormones, validating this method according to ANVISA and INMETRO. The biosorbent presented functional groups typical of cellulose, hemicellulose, lignin, and proteins, with an amorphous, fibrous, and porous surface...
September 10, 2018: Environmental Technology
Shivangi Upadhyay, Abhrajyoti Tarafdar, Alok Sinha
Serratia sp. strain SU.ISM.1 was isolated from Noamundi iron ore mines for the first time and was observed for hexavalent chromium reduction, and growth kinetics modelling was applied for bacterial chromium reduction. For 4-8 ppm of hexavalent chromium concentration, complete reduction was observed within 36 h when the selected isolate was applied, and for 12-20 ppm chromium concentration, complete reduction was achieved within 48 h. The viable biomass concentration increased up to 36 h of treatment time, after which the biomass concentration gradually declined...
September 8, 2018: Environmental Technology
Pablo Gonzalez-Montero, Nieves Iglesias-Gonzalez, Rafael Romero, Alfonso Mazuelos, Francisco Carranza
Copper smelter flue dust is a residue, rich in zinc, originating from the pyrometallurgical process of copper, and constitutes a potential raw material for zinc production. In order to valorise this waste by hydrometallurgical processes, its leaching with sulphuric acid at constant pH is studied. Experimental conditions (temperature, pH, and pulp density) are optimised by design of experiments in order to maximise Zn and Cu extractions while minimising the leaching of Fe. The experimental results are fitted to a full-quadratic second-order equation model by applying multiple regression analysis for extractions of Zn, Cu, and Fe...
September 7, 2018: Environmental Technology
Jordan Hollman, John Albino Dominic, Gopal Achari, Cooper H Langford, Joo-Hwa Tay
Many water and wastewater treatment plants (WWTPs) are fitted with a UV system that provides post treatment disinfection before the water is released to receiving water. This paper presents a study on expected removal for the pharmaceutical venlafaxine (VEN) in a typical UV unit at a municipal WWTP with analysis of removal rates of an advanced oxidation process using UV irradiation with injection of H2 O2 . The study is supported by bench scale degradation experiments on VEN. Results demonstrated that UV can completely degrade VEN, but the addition of H2 O2 increased pseudo first order rate constant by up to 2...
September 6, 2018: Environmental Technology
Ma Shuang-Chen, Chai Jin, Chen Jia-Ning, Wu Kai, Wan Zhong-Cheng, Zhang Jing-Rui
A novel zero-liquid discharge (ZLD) technology for desulfurization wastewater treatment is put forward in this paper. A ZLD reconstruction project performed on 2 × 320 MW desulfurization system was taken as the research object, to study the evaporator structure and the key factors affecting spray evaporation through CFD numerical simulation. The result shows that when the evaporator diameter is 2.4 m, the central density difference and the temperature difference of evaporator outlets are 0 kg/L and 0°C, under this condition, the wall sticking can be avoided effectively, and the uniformity of evaporator's outlet flow field is improved...
September 6, 2018: Environmental Technology
Lienda Handojo, Cherilisa, Antonius Indarto
Cocoa bean skin is a waste of chocolate industries that mostly contains hemicellulose, cellulose, and lignin. This material shows to be a promising feedstock for the production of liquid smoke and charcoal. The study was aimed to analyse the influence of temperature and heating rate of cocoa bean skin pyrolysis to the production of liquid smoke. Optimization of pyrolysis process variables, i.e. by adjusting the suitable temperature and heating rate, is the key to obtain a high-quality product. The pyrolysis process was carried out using heating rates between 5°C/min and 15°C/min at three pyrolysis temperatures of 450°C, 500°C, and 550°C...
September 5, 2018: Environmental Technology
Huang Cy, Fu Lh, Sung Mh, Huang Cf, Wu Jp, Kuo Hw
Ibuprofen (IBU) has been considered as one of emergent pharmaceutical contaminants in environments due to its occurrences in natural water bodies. Some reports suggested that the IBU was biodegradable but details about biodegradation pathways and functional microbial community were still not fully clear. This study was aimed to assess IBU biodegradation using three different activated sludges (i.e. H: hospital, M: municipal, and D: distillery) with foci on surmising degradation pathway based on UPLC/Q-ToF/MS (ultra-performance liquid chromatography quadrupole time of flight mass spectrometry) analyses and concluding microbial community according to high-throughput sequencing for partial 16S rRNA gene...
September 5, 2018: Environmental Technology
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