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Environmental Technology

Samuel E Agarry, Kigho M Oghenejoboh, Ganiyu K Latinwo, Chiedu N Owabor
The objectives of this study were to evaluate the potential of vertical surface flow constructed wetland (VSF-CW) vegetated with Eichhornia crassipes to treat petroleum refinery secondary wastewater under tropical conditions. Also, to provide a comparative evaluation of biotreatment kinetic models (traditional first order and other alternative kinetic models) proposed to describe the removal kinetics of organics (biochemical oxygen demand (BOD) and chemical oxygen demand (COD)), nitrate-nitrogen and total petroleum hydrocarbons (TPH) in wetland systems...
November 16, 2018: Environmental Technology
Hongwei Wu, Qiyan Feng, Hong Yang, Ping Lu, Bo Gao, Amir Alansari
The present work investigated the removal behavior of phenanthrene (PHE) by nano zero-valent iron immobilized on alkali modified biochar (nZVI/MB). Batch studies showed that nZVI/MB enhanced PHE removal by 4.9 times that of the nZVI and 1.2 times that of modified biochar (MB) alone, due to greater surface area and the inhibited aggregation of nZVI on the surface of MB. Transmission electron microscopy images revealed that the spherical nZVI particulates with average diameter of 32 nm uniformly dispersed on the surface of MB...
November 15, 2018: Environmental Technology
Marcos Vinicius Pereira, Aline Figueredo Dassoler, Paulo Wagnner Antunes, Ricardo Franci Gonçalves, Servio Tulio Cassini
Effluents from municipal wastewater treatment have been long recognised as suitable media for the cultivation of microalgae biomass. However, few studies report data concerning biomass productivity in continuous reactors using unsterilised wastewater effluents. This study focuses on indigenous microalgae strains that grow with native bacteria and are applicable for biomass production and tertiary wastewater treatment in continuous growth mode. Initially, five Chlorophyta strains were isolated and grown in batch mode to single out a potential inoculum for the experiments in continuous growth mode...
November 14, 2018: Environmental Technology
Mohammed S Shihab, Kadir Alp, Mustafa Türker, Ilker Akmirza, Rasha K Mhemid
Many studies have discussed the biotreatment of ethanethiol (ET) under aerobic conditions. However, O2 free conditions offer bio-conversion of ET gas into elemental sulphur and/or sulphate using NO3 - as electron acceptor, and this has been not studied. In this study, an anoxic biotrickling filter was tested in lab-scale conditions with ET/NO3 - ratio 0.74 and 0.34 mole/mole to remove malodorous ET waste gas. The study examined the effect of three operational parameters: ET inlet concentrations (150, 300, 800, and 1500 mg/m3 ), trickling velocities (0...
November 11, 2018: Environmental Technology
Ze Liu, Li Li, Ningning Shao, Tao Hu, Le Han, Dongmin Wang
This work is focused on crystal phase transition of solid wastes and functional application of crystal analcime in waste water purification, which provide a new environment-friendly route. In this paper, analcime was synthesized from steel slag and Circulating fluidized bed combustion (CFBC) fly ash (CFA) by hydrothermal method enhanced via geopolymerization (non-crystallized process). Then the analcimes were used for the removal of heavy metal ions (Pb2+ , Cu2+ ) in aqueous solutions. Both the raw materials and products were characterized by XRF, XRD, FT-IR, SEM-EDS, and TEM...
November 7, 2018: Environmental Technology
Zhaoying Guo, Qi Wang, Tao Shen, Jianlei Kuang, Wenbin Cao
The novel urchin-like and yolk-shell titania microspheres (henceforth called UYTMs) with nanowires/microspheres hierarchical structures were successfully synthesized by a synthetic sol-gel and hydrothermal method without using any template. Uniform TiO2 microspheres were firstly prepared by the sol-gel method, and the great monodispersed properties was delicately regulated by using the surfactant of KCl, aniline and a proper amount of water. The urchin-like yolk-shell morphology was further achieved by a NaOH-assisted hydrothermal process, and the diameter and shell thickness of the UYTMs were highly controlled by the concentration of NaOH...
November 7, 2018: Environmental Technology
Mariem Jeddi, Fatma Karray, Slim Loukil, Najla Mhiri, Manel Ben Abdallah, Sami Sayadi
The purpose of the present work is to treat saline Tuna fish wastewater, with salt concentration of 43 g L-1 and total organic carbon (TOC) of 8.3 g L-1 , using an anaerobic fixed bed reactor involving salt-tolerant bacteria from natural hypersaline environment during 150 days. The highest volatile solids (VS) removal efficiency of 84.1% was recorded for the organic loading rate (OLR) of 1.04 g TOC L-1 .d-1 and the lowest salinity of 14.6 g NaCl L-1 . In addition, the maximum biogas production of 0...
November 7, 2018: Environmental Technology
Rasha Khalid Sabri Mhemid, Kadir Alp, Mustafa Turker, Ilker Akmirza, Mohammed Salim Shihab
The anoxic lab-scale bio-scrubber was studied to investigate the dimethyl sulfide (DMS) removal performance under different operation conditions for 315 days. DMS removal in bio-scrubber system was performed by controlling and changing the operation parameters, including inlet concentration, empty bed residence time (EBRT) and spraying density (SD) of irrigation. Best conditions in the system were achieved for SD of 0.18 m3 /m2 h within EBRT of 40 s at an inlet gas concentration of 150 mg/m3 which resulted a removal of 93% for the waste gas stream in the bio-scrubber column and bio-degradation in bio-reactor tank was led to 89% of DMS removal that transferred bio-reactor, while 91...
November 7, 2018: Environmental Technology
Daria Popugaeva, Konstantin Kreyman, Ajay K Ray
The field dataset including physico-chemical characteristics of Khibiny alkaline massif groundwater aquifer was analysed for the first time by applying chemometric methods to explore the relationships between investigated parameters in both time and frequency domains. Elevated Al concentration in water of this aquifer is described as a serious health concern when used for the household water supply. The time series of 12 physico-chemical parameters were examined by using Pearson correlation, multiple linear regression and spectral analysis based on fast Fourier transform (FFT) algorithm...
November 5, 2018: Environmental Technology
Xiaomei Zhang, Anwu Lu, Dapei Li, Liang Shi, Zaigang Luo, Chengsong Peng
In this paper, simultaneous removal of methylene blue (MB) and Pb2+ from the binary component system by an easily prepared cross-linked lignosulfonate bio-adsorbent (CLLS) was described. CLLS was characterized by FTIR, SEM/EDS and TGA. The influences of pH, temperature, contact time and initial MB and Pb2+ concentrations on the adsorption performance were investigated. The results demonstrated a good ability of CLLS to remove MB and Pb2+ simultaneously. Using of 1.0 g L-1 loading, removal efficiency of MB and Pb2+ reached 98...
November 3, 2018: Environmental Technology
B Shoba, J Jeyanthi, S Vairam
This study reports the synthesis of cellulose acetate (CA) membranes of different weight percentages of the polymer ranging from 5 to 17.5 wt% with 2.5% increment and their behaviour towards oil removal from water. The membrane showed decreased water content and porosity and also increased hydraulic resistance upto 3.38 kPa/(l m-2  h-1 ) as the concentration of polymer increases. The Atomic Force Microscopic studies reveal that the membrane shows decreased arithmetic mean roughness from 36.291 to 5...
November 2, 2018: Environmental Technology
Jonas Schneider, Jan Michael Burg, Ulf Theilen, Harald Weigand, Felix Brück
The rotating drum composter (RDC) is one of the most widespread reactor systems for biowaste treatment, worldwide. Nevertheless, knowledge on optimum operating conditions including, e.g. fill level, turning frequency, and mixing tool configuration is sparse. This study investigated the effect of static mixing tools (SMTs) on mixing in a rotating drum at high fill levels (60-80%). The methodological approach encompassed mixing experiments in a laboratory RDC using soaked wheat grains as a model material. The temporal course of material blending was quantified in terms of the entropy of mixing using digital image analysis...
November 1, 2018: Environmental Technology
Gustavo Affonso Pisano Mateus, Tássia Rhuna Tonial Dos Santos, Isabela Sperandino Sanches, Marcela Fernandes Silva, Murilo Barbosa de Andrade, Michele Putti Paludo, Raquel Guttierres Gomes, Rosângela Bergamasco
The lack of data regarding the mechanisms at work in the coagulation processes of different substances using magnetic coagulants makes it difficult to understand the phenomena involved and, consequently, makes it difficult to elucidate the mechanisms involved in the coagulation process. Thus, the present study aimed at evaluating the performance of a magnetic coagulant composed of iron oxide (Fe3 O4 ) functionalised with Moringa oleifera (MO) salt extract in the treatment of a synthetic food industry wastewater simulated by the addition of dye to distilled water...
November 1, 2018: Environmental Technology
Siping Niu, Xuan Wang, Jianghua Yu, Youngchul Kim
Constructed wetlands (CWs) are natural-friendly method to eliminate the pollutants stormwater pollutants. For this study, a pilot-scale treatment system consisting of a sedimentation tank (ST) and five recirculated fill-and-drain wetlands (namely CW-1, CW-2, CW-3, CW-4 and CW-5) were constructed to treat the first-flush from the impervious road. From bottom to top, the main substrates of CWs were selected as 0 cm woodchip + 60 cm pumice for CW-1, 15 cm woodchip + 45 cm pumice for CW-2, 30 cm woodchip + 30 cm pumice CW-3, 45 cm woodchip + 15 cm pumice CW-4 and 60 cm woodchip + 0 cm pumice for CW-5...
November 1, 2018: Environmental Technology
Danny R de Graaff, Edward J H van Dijk, Mark C M van Loosdrecht, Mario Pronk
For a stable operation, the aerobic granular sludge process requires mechanically strong granules in balance with the shear forces in the reactor. Despite a wide general interest in granular stability, the mechanical strength of both anaerobic and aerobic granular sludge received very little attention. In this study, a high-shear method for strength characterization has been evaluated for full-scale aerobic granular sludge (AGS). Abrasion times up to 90 min showed a stable abrasion rate coefficient (K), while prolonged periods of abrasion up to 24 h resulted in a decrease in abrasion rate...
October 31, 2018: Environmental Technology
Qiong Huang, Han Si, Shukun Yu, Jiaxiao Wang, Tao Tao, Bo Yang, Yunxia Zhao, Mindong Chen
A series of MnOx -CeO2 catalysts with MOx doping (M = Cu, Fe, Co and La) supported on cordierite were synthesized by the citric acid complex method, showing preferable catalytic oxidation of chlorobenzene. The distribution of active oxides, surface areas, as well as the structural morphology of M-MnOx -CeO2 catalysts varied with the different Mn/Ce and M/Mn molar ratios. Meanwhile, physicochemical properties of these catalysts were characterized by XRD, BET, SEM, TEM, H2 -TPR and IR. More importantly, the catalytic oxidation routes were also investigated where the process was from chlorobenzene to CO2 , H2 O, HCl and other by-products for the FeOx -MnOx -CeO2 and CuO-MnOx -CeO2 catalysts...
October 31, 2018: Environmental Technology
Ling Cong, Lichun Mo, Guoxin Yan, Wenmei Ma, Yanan Wu, Jiakai Liu, Jiexiu Zhai, Yu Wang, Zhenming Zhang
Forests and wetlands, as two important ecosystems, play a crucial role in reducing the concentration of particulate matters. The main purpose of this study is to reveal the contribution of forest and wetland ecosystems to the reduction of particulate matter. We collected the concentration and meteorological data during the daytime in a forest and a wetland in the Olympic Park in Beijing. The main results are as follows: daily variation in the PM10 and PM2.5 concentration had the similar trend with the lowest value at midday and relatively high values in the morning and at nightfall...
October 31, 2018: Environmental Technology
Bruno Matheus Favero, Ana Carolina Favero, Silvio Roberto Taffarel, Fernanda Siqueira Souza
The present study investigated the efficiency of physicochemical processes of coagulation and flocculation and Fenton advanced oxidative process in reducing the parameters of colour, turbidity and Chemical Oxygen Demand (COD) of a real effluent from a textile industry. During the physicochemical process, the efficiencies of different coagulants (aluminum polychloride (Polifloc 18), ferric chloride (Acquafloc FC40), aluminum sulphate combined with organic coagulant (AST) and aluminum sulphate) and nonionic (FX NS2), cationic (FX CS6 and FX CS7) and anionic (FX AS6 and AN905) flocculants were tested...
October 29, 2018: Environmental Technology
Alex Basso, Andrei Pavei Battisti, Regina de Fátima Peralta Muniz Moreira, Humberto Jorge José
Volatile organic compounds (VOCs) are known to be hazardous and associated with several human health problems. Thus, many technologies have been developed in recent years for their removal, such as thermal catalysis, photocatalysis and ozonization. In this study, the main objective was to evaluate the effects of incorporating titanium dioxide into an acrylic-based paint for gaseous toluene abatement. Paints with photocatalytic properties were prepared by adding TiO2 P25 powder to an acrylic-based paint, using the following proportions: 0, 10, 15, 20 and 50 wt% (dry basis)...
October 29, 2018: Environmental Technology
Javier A Arcibar-Orozco, Alfredo I Flores-Rojas, José R Rangel-Mendez, Paola E Díaz-Flores
Today, fluoride represents one of the most often found, and resilient, pollutants threatening the health of millions of people around the globe. The use of biosorbents is an interesting alternative technique for the removal of fluorine-ions. Chitosan is a natural biopolymer with surface groups capable of removing fluorine; however, their lack of mechanical stability restricts its application. In the present work, we proposed that such limitations can be overcame by forming a composite with zeolite (ZCC). A proper zeolite-to-chitosan ration must be keep to prevent a collapse of the materiaĺs capacity...
October 29, 2018: Environmental Technology
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