Read by QxMD icon Read

Environmental Technology

H M H Gad, M A Youssef
Nano-pore hydroxyapatite (HAP) was prepared using physical activation of raw and chemically modified [using Acid; HNO3 (HAPA) or Base; NaOH (HAPB)] bone char (BC) by heating at 900°C for 1 hr to obtain HAP9, HAPA9 and HAPB9, respectively. Investigation the effects of thermal and chemical treatment of prepared nano-hydroxyapatite on elemental analysis, FTIR, scanning electron microscopy, surface area and consequently, the sorption behavior of Eu (III) ions onto the prepared nano-pore hydroxyapatite. Batch adsorption technique was used and the obtained results revealed that the optimum pH = 5...
August 16, 2017: Environmental Technology
Hassen Khazri, Ibtissem Ghorbel-Abid, Rafik Kalfat, Malika Trabelsi-Ayadi
Pharmaceutical products including analgesics, antibiotics, and antiepileptics are often present in wastewater treatment effluents, lakes, and rivers and have been found in waterways of many countries. The adsorption of two common pharmaceuticals present in surface waters, clarithromycin (CLR) and atenolol (ATN), onto cuttlefish bone powder treated with HCl has been investigated. Adsorption experiments were carried out at different pH conditions and the experimental equilibrium data were fitted to the Langmuir and Freundlich...
August 16, 2017: Environmental Technology
E A Couto, M L Calijuri, P P Assemany, M H B Souza
This study evaluated the effect of high-rate ponds (HRPs) of different depths (20, 30 and 40 cm) on the carbon assimilation by microalgae cultivated in domestic sewage. The efficiency of the dissolution provided by the carbonation column and the carbon release to the atmosphere through the movement of the paddle wheels were also investigated. Dissolution efficiencies of 50%, 48% and 46% were obtained in the HRPs of 20, 30 and 40 cm depth, respectively. These differences can be attributed to the time necessary to recirculate the volume of each HRP in the carbonation column...
August 16, 2017: Environmental Technology
Deepak Sharma, Abhinesh Kumar Prajapati, Rumi Choudhary, Rajesh Kumar Kaushal, Dharm Pal, Ashish N Sawarkar
CuO catalyst was prepared from copper sulfate by alkali precipitation method followed by drying and calcination. Characterization of CuO catalyst using X-ray diffraction, Brunauer-Emmett-Teller, and Barrett-Joyner-Halenda surface area analysis envisaged the effectiveness of CuO as a catalyst for the treatment of biodigester effluent (BDE) emanated from distilleries. The catalytic thermolysis is an efficient advance treatment method for distillery biodigester effluent (BDE). CT treatment of BDE was carried out in a 0...
August 16, 2017: Environmental Technology
Mujahid Ali, Qunxing Huang, Bingcheng Lin, Binhang Hu, Wang Fei, Chi Yong
The aim of this paper is to present the effect of hydrolysis treatment on the thermal reaction characteristics of sludge and the leaching test of heavy metals contained in the sludge. Raw and hydrolysis treated sludge (at temperature of 200 °C and pressure 0.4MPa) samples were collected from local municipal sewage sludge treatment plant. Thermogravimetric analysis (TGA) was carried out between 25 to 900 °C at the heating rate of 10 and 20 °C/min under incineration and pyrolysis atmospheres. The leaching behavior of toxic heavy metals in the sludge was studied along with ash composition...
August 14, 2017: Environmental Technology
Nádia S V Capanema, Alexandra A P Mansur, Herman S Mansur, Anderson C de Jesus, Sandhra M Carvalho, Poliane Chagas, Luiz C de Oliveira
In this study new eco-friendly hydrogel adsorbents were synthesized based on carboxymethylcellulose (CMC, degree of substitution DS = 0.7) chemically crosslinked with citric acid (CA) using a green process in aqueous solution and applied for the adsorption of methylene blue (MB). Spectroscopic analyses demonstrated the mechanism of crosslinking through the reaction of hydroxyl functional groups from CMC with CA. These CMC hydrogels showed very distinct morphological features dependent on the extension of crosslinking and their nanomechanical properties were drastically increased by approximately 300% after crosslinking with 20% CA (e...
August 13, 2017: Environmental Technology
Natália S F Trotte, M Alzamora, D R Sánchez, Nakédia M F Carvalho
This study aims to prepare environmentally friendly iron catalysts supported on silica, using glycerol as green reducing and stabilizing agent, for application in heterogeneous Fenton degradation of the pollutant dye methyl orange. The catalysts were characterized by XRD, AAS, SEM, TEM, thermogravimetric analyses, Mössbauer and FTIR spectroscopies, which revealed the formation of iron(II)/(III) oxalates from the oxidation of glycerol by the iron(III) nitrate precursor. Besides, iron oxihydroxide nanoparticles with superparamagnetic behavior were also formed...
August 10, 2017: Environmental Technology
Vinod Kumar, Jogendra Singh, A K Chopra
Laboratory experiments were carried out to assess the phytoremediation potential of water hyacinth (Eichhornia crassipes [Mart.] Solms) for the removal of different parameters of the paper mill effluent. The maximum removal efficiency of E. crassipes and phyto-kinetic removal rate was recorded at 50% concentration of the paper mill effluent followed by 60 days of phytoremediation experiments. The most percent reduction was observed in the contents of EC (62.23%), TDS (72.54%), BOD (79.93%), COD (85.66%), TKN (89...
August 9, 2017: Environmental Technology
Meghdad Pirsaheb, Samira Mohamadi, Sama Rahmatabadi, Hooshyar Hossini, Fabrício Motteran
In this study simultaneous degradation of organic matter and color removal from food processing industries wastewater using an integrated anaerobic baffled reactor-granular activated carbon (IABRGAC) was investigated. To evaluate the efficiency of IABRGAC, the effective parameters were studied such as hydraulic retention time (HRT) and GAC filling ratio. The bioreactor was operated at 3, 4, 5 d of HRT and GAC filling ratio of 20%, 35% and 50%. The parameters were evaluated in steady state condition. To analyses and optimizing the independent operating variables, response surface methodology was applied...
August 9, 2017: Environmental Technology
E Blondeel, S De Wandel, R Florin, S Hugelier, M Chys, V Depuydt, K Folens, G Du Laing, A Verliefde, S W H Van Hulle
Scrap material recovery and recycling companies are producing wastewater in which common pollutants (such as COD, nutrients and suspended solids), toxic metals, polyaromatic hydrocarbons and poly chlorinated biphenyls frequently can exceed the discharge limits. Lab-scale optimisation of different possible physical-chemical treatment techniques was performed on the wastewater originating from three different companies in view of further testing at pilot-scale testing and implementation at full-scale. The lab-scale tests demonstrate that sedimentation or hydrocyclone treatment as stand-alone technique cannot be used for proper treatment of this type of wastewater...
August 9, 2017: Environmental Technology
Youli Zhu
Bio-carrier is one of the most important part in biofilm process for wastewater treatment. The paper employed a blending method to prepare a new hydrophilic and biocompatible magnetic polypropylene carrier (HBMPC) and pure polypropylene carrier (PPC) for comparative experiments. Mechanical strength, magnetic induction on surface and microstructure of HBMPC were measured and characterized respectively, and hydrophilicity and biocompatibility of HBMPC were also investigated. The results showed that mechanical strength of PPC and HBMPC was not much different, magnetic induction on the surface of HBMPC was 4-6mT, HBMPC had relatively large surface roughness and specific surface, average water content of PPC and HBMPC was 47...
August 9, 2017: Environmental Technology
Gongduan Fan, Zhaoyue Su, Rujing Lin, Zhuwu Jiang, Renxing Xu, Shumin Wang
In order to gain the run parameters of the combined process of coagulation/in situ chlorination/ultrafiltration (UF) so that the system can remove as much organic contaminants as possible without serious membrane fouling, the impacts of operation conditions in coagulation and pre-chlorination unit on organics removal and membrane fouling rate were investigated in a pilot-scale test. The characteristics of organics in UF influent were examined by using the method of excitation emission matrix spectroscopy (EEMs) to find out fouling behavior of different natural organic matter (NOM) compositions to UF membrane...
August 9, 2017: Environmental Technology
Tamer M Alslaibi, Ziyad Abunada, Salem S Abu Amr, Ismail Abustan
Landfills are one of the main point sources of groundwater pollution. This research mainly aims to assess the risk of nitrate (NO3(-)) transport from the unlined landfill to subsurface layers and groundwater using experimental results and the SESOIL model. Samples from 12 groundwater wells downstream of the landfill were collected and analyzed in 2008, 21 years after the landfill construction. The average NO3(-) concentration in the wells was 54 mg/L, slightly higher than the World Health Organization (NO3(-) 50 mg/L) standards...
August 9, 2017: Environmental Technology
Helen Paola Toledo-Jaldin, Alien Blanco-Flores, Víctor Sánchez-Mendieta, Osnieski Martín-Hernández
Removal potentials of a surfactant modified zeolite (SMZ) and clay (SMC) for atrazine adsorption were evaluated. Materials were modified with hexadecyl trimethyl ammonium bromide (HDTMA) and benzyl octadecyl dimethyl ammonium chloride (BODA) considering the critical miscelar concentration (CMC) of each one (0.94 and 0.041 meq/L, respectively). The influence of the surfactant was analyzed in detail, particularly the formation of surfactant layers (complete or partial) connected with the length of the surfactant tail (16 and 18 methyl groups or number of carbons in the chain)...
August 7, 2017: Environmental Technology
Selene García-Reyes, Gustavo Yáñez-Ocampo, Arnoldo Wong-Villarreal, Rajesh Kannan Rajaretinam, Citarasu Thavasimuthu, Rodrigo Patiño, Ma Laura Ortiz-Hernández
Biodegradation of some organochlorine and organophosphate pesticides is difficult because of their low solubility in water and, therefore, their low bioavailability. To overcome the hydrophobicity problem and the limited pesticide availability, biosurfactants play a major role. In this study we evaluated the effect of an extract from Pseudomonas sp. B0406 strain with surfactant properties, on the solubility of two pesticides: Endosulfan and methyl parathion. Such process was performed in order to increase the aqueous solubility of both pesticides, to increase its availability to microorganisms and, to promote their biodegradation...
August 7, 2017: Environmental Technology
Peng Fan, Xiao Jiang, Junlian Qiao, Lina Li
A magnetic propeller agitator and a magnetic reactor were designed to enhance the removal of heavy metals by zerovalent iron (ZVI) in comparison with the non-magnetic reactor. The weak magnetic field (WMF) applied in the magnetic propeller agitator or the magnetic reactor significantly improved the Cu(II)-EDTA removal by ZVI from 10% without WMF to 98% with WMF within 2.5 h at pHini 6.0. Simultaneous removal of Cu(II) and As(V) by ZVI was performed in the magnetic reactor. The results show that the pseudo-first-order rate constants of Cu(II) and As(V) removal by ZVI in the magnetic reactor were increased by 1...
August 7, 2017: Environmental Technology
Rodrigo F Bueno, Roque P Piveli, Fábio Campos, Pedro A Sobrinho
This study has investigated the biological nitrogen removal by simultaneous nitrification and denitrification processes (SND) in a system of continuous flow activated sludge process. The investigation had four stages and evaluated the system behavior under different solid retention times (SRT), food-to-mass ratios (F/M) and dissolved oxygen (DO) concentrations. The data showed that the concentration of DO 0.5±0.2 mgO2/L did not affect the growth of heterotrophic bacteria (2.2-3.1 d-1 at 20°C) and autotrophic nitrifying bacteria (0...
August 3, 2017: Environmental Technology
Ariel A Szogi, John H Loughrin, Matias B Vanotti
Large volumes of wastewater from confined pig production are stored in anaerobic lagoons. Control methods are needed to reduce contributions to air pollution by foul odors from these lagoons. In a replicated pilot-scale lagoon column experiment, we evaluated the effect of pig wastewater pre-treatment on water quality improvements and reduction in concentration of selected malodor compounds in lagoons receiving liquid from: 1) flocculant enhanced solid-liquid separation (SS), and 2) solid-liquid separation plus biological N treatment using nitrification-denitrification (SS+NDN)...
August 2, 2017: Environmental Technology
Sidra Rana, Umair Nazar, Jafar Ali, Qurat Ul Ain Ali, Nasir M Ahmad, Fiza Sarwar, Hassan Waseem, Syed Umair Ullah Jamil
No abstract text is available yet for this article.
August 2, 2017: Environmental Technology
(no author information available yet)
No abstract text is available yet for this article.
August 1, 2017: Environmental Technology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"