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https://www.readbyqxmd.com/read/29223117/removal-of-veterinary-antibiotics-from-wastewater-by-electrocoagulation
#1
Wojciech Baran, Ewa Adamek, Marcin Jajko, Andrzej Sobczak
The aim of this study was to assess the effectiveness of veterinary antibiotic removal from wastewater using an electrocoagulation method. The removal efficiency of ampicillin, doxycycline, sulfathiazole and tylosin; the antibiotic degradation degree after electrolysis; and the toxicity and qualitative composition of antibiotic solutions after electrocoagulation were determined in the experiments. HPLC-QTOF was used for quantitative and qualitative determination. The eco-toxicity was assessed using the MARA® assay...
November 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/29223092/treatment-of-dye-wastewater-using-an-ultrasonic-aided-nanoparticle-stacked-activated-carbon-kinetic-and-isotherm-modelling
#2
Ponnusamy Senthil Kumar, Sunita J Varjani, Subburaj Suganya
The present work explains the biosorption of malachite green dye from aquatic systems by nano zero valent iron stacked activated carbon (NZVI-AC), which was prepared by dual surface modification strategy. NZVI-AC was characterized by using FTIR, SEM-EDX, XRD and TGA. NZVI-AC exhibited efficient performance in dye biosorption properties. Experimental variables such as time, pH, dye concentration, temperature and biosorbent dosage influenced Langmuir adsorption capacity of 187.3 mg/g. The present biosorption system was best described by pseudo-first order kinetics...
December 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29223088/probing-molecular-interaction-mechanisms-of-organic-fouling-on-polyamide-membrane-using-a-surface-forces-apparatus-implication-for-wastewater-treatment
#3
Qingye Lu, Jun Huang, Omar Maan, Yang Liu, Hongbo Zeng
Surface fouling is the dominant fouling mechanism of thin-film composite (TFC) membranes used in reverse osmosis (RO) technology. Understanding the complex interactions between foulant-membrane which drive the attachment and growth of foulants on membrane surface is of both fundamental and practical importance. This work aims to understand the molecular interaction mechanisms of organic fouling on RO-TFC membranes. A surface forces apparatus (SFA) was employed to directly measure the interaction forces and time-dependent adsorption behaviors between model organic foulants: humic acid (HA), bovine serum albumin (BSA), and lipopolysaccharides (LPS) and a polyamide (PA) thin film...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223079/kaolinite-adsorption-regeneration-system-for-dyestuff-treatment-by-fenton-based-processes
#4
Emilio Rosales, Delia Anasie, Marta Pazos, Iuliana Lazar, M Angeles Sanromán
The regeneration and reuse of adsorbents is a subject of interest nowadays in order to reduce the pollution and the wastes generated in the adsorption wastewater treatment. In this work, the regeneration of the spent kaolinite by different advanced oxidation processes (Fenton, electro-Fenton and electrokinetic-Fenton) was evaluated. Initially, it was confirmed the ability of a low cost clayey material, kaolinite, for the adsorption of model dye such as Rhodamine B showing Freundlich isotherm fitting. Then, the regeneration and consequent degradation of the pollutant in the adsorbent by Fenton based processes was carried out...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223054/optimizing-adsorption-of-blue-pigment-from-wastewater-by-nano-porous-modified-na-bentonite-using-spectrophotometry-based-on-response-surface-method
#5
Neshat Moradi, Shiva Salem, Amin Salem
This work highlighted the effective activation of bentonite paste to produce nano-porous powder for removal of cationic dye from wastewater. The effects of activation parameters such as soda and moisture contents, ageing time and temperature were analyzed using response surface methodology (RSM). The significance of independent variables and their interactions were tested by blending the obtained powders with wastewater and then the adsorption was evaluated, spectrophotometrically. The experiments were carried out by preparation of pastes according to response surface methodology and central composite design, which is the standard method, was used to evaluate the effects and interactions of four factors on the treatment efficiency...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29222663/magnetic-ethylene-diamine-functionalized-graphene-oxide-as-novel-sorbent-for-removal-of-lead-and-cadmium-ions-from-wastewater-samples
#6
Mahdi Ghorbani, Alireza Shams, Orkideh Seyedin, Nahid Afshar Lahoori
In this paper, magnetic ethylene diamine-functionalized graphene oxide (MDFGO) as a novel sorbent was synthesized and applied for removal of Pb(II) and Cd(II) from real wastewater samples. The morphology and molecular structure of MDFGO were studied by different analytical methods. The effective parameters in adsorption efficiency of Pb(II) and Cd(II) were studied and optimized using experimental design. Under the optimal condition, the effective parameters including pH, sorbent dosage, shaking rate, and adsorption time were 6...
December 8, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29222104/effect-of-start-up-strategies-and-electrode-materials-on-carbon-dioxide-reduction-on-bio-cathodes
#7
Soroush Saheb-Alam, Abhijeet Singh, Malte Hermansson, Frank Persson, Anna Schnürer, Britt-Marie Wilén, Oskar Modin
The enrichment of CO2-reducing microbial bio-cathodes is challenging. Previous research has shown that a promising approach could be to first enrich bio-anodes and then lower the potential so the electrodes are converted into bio-cathodes. However, the effect of such a transition on the microbial community on the electrode has not been studied. The goal of this study was, thus, to compare the start-up of bio-cathodes from pre-enriched anodes with direct start-up from bare electrodes and to investigate changes in microbial community composition...
December 8, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29220785/metagenomic-exploration-reveals-a-marked-change-in-the-river-resistome-and-mobilome-after-treated-wastewater-discharges
#8
Itziar Lekunberri, José Luis Balcázar, Carles M Borrego
Mobile genetic elements (MGEs) are key agents in the spread of antibiotic resistance genes (ARGs) across environments. Here we used metagenomics to compare the river resistome (collection of all ARGs) and mobilome (e.g., integrases, transposases, integron integrases and insertion sequence common region "ISCR" elements) between samples collected upstream (n = 6) and downstream (n = 6) of an urban wastewater treatment plant (UWWTP). In comparison to upstream metagenomes, downstream metagenomes showed a drastic increase in the abundance of ARGs, as well as markers of MGEs, particularly integron integrases and ISCR elements...
December 5, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29220765/transient-disturbance-of-engineered-zno-nanoparticles-enhances-the-resistance-and-resilience-of-anammox-process-in-wastewater-treatment
#9
Zheng-Zhe Zhang, Ya-Fei Cheng, Lian-Zeng-Ji Xu, Yu-Hui Bai, Jia-Jia Xu, Zhi-Jian Shi, Qian-Qian Zhang, Ren-Cun Jin
The increasing use of engineered nanoparticles (NPs) in consumer and industrial products raises concerns about their environmental impacts, but their potential influence on anaerobic ammonium oxidation (anammox) process in wastewater treatment remains unknown. In this study, the response of granule-based anammox reactor to different loads of ZnONPs was investigated. The introduction of 1-5mgL-1 ZnONPs did not affect reactor performance, but 90% of the nitrogen removal capacity was deprived by a shock of 10mgL-1 ZnONPs within 3days...
December 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29220717/microbial-electricity-driven-anoxic-ammonium-removal
#10
Anna Vilajeliu-Pons, Christin Koch, Maria D Balaguer, Jesús Colprim, Falk Harnisch, Sebastià Puig
Removal of nitrogen, mainly in form of ammonium (NH4+), in wastewater treatment plants (WWTPs) is a highly energy demanding process, mainly due to aeration. It causes costs of about half a million Euros per year in an average European WWTP. Alternative, more economical technologies for the removal of nitrogen compounds from wastewater are required. This study proves the complete anoxic conversion of ammonium (NH4+) to dinitrogen gas (N2) in continuously operated bioelectrochemical systems at the litre-scale...
December 1, 2017: Water Research
https://www.readbyqxmd.com/read/29220716/self-accelerating-sulfur-reduction-via-polysulfide-to-realize-a-high-rate-sulfidogenic-reactor-for-wastewater-treatment
#11
Liang Zhang, Zefeng Zhang, Rongrong Sun, Shuang Liang, Guang-Hao Chen, Feng Jiang
Sulfur reduction is a promising alternative to sulfate reduction as it can generate sulfide at a low cost for the precipitation of heavy metals or autotrophic denitrification in wastewater treatment. However, the extremely low water solubility of elemental sulfur limits its bioavailability and results in a low sulfur-reduction rate. Polysulfide, which is naturally generated through reactions between sulfur and sulfide, can enhance the bioavailability of sulfur and thus contribute to high-rate sulfur reduction...
November 28, 2017: Water Research
https://www.readbyqxmd.com/read/29217124/analysis-of-the-mixing-performance-of-a-full-scale-membrane-bioreactor-for-municipal-wastewater-treatment
#12
Qing Wu, Xiaoxu Yan, Xue Xia, Changyong Zhang, Tao Xue, Kaichang Yu, Peng Liang, Xia Huang
High energy consumption remains to be a key problem for application of membrane bioreactor (MBR). Optimization of MBR to save energy requires a compressive understanding of the performance of the reactor, among which the mixing performance is a significant parameter, however received little attention. In this study, a tracer experiment was carried out in a full-scale MBR for municipal wastewater treatment in China. The mixing performance of both the entire plant and the membrane tanks were evaluated. The entire plant was found to be a cascade of 2...
November 23, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29216955/combined-toxicity-of-an-environmental-remediation-residue-magnetite-fe3o4-nanoparticles-cr-vi-adduct
#13
Zhuan Li, Miao Liu, Li Ke Chen, Guang Zhu Li
OBJECTIVE: This paper aims to elucidate the combined toxicity of magnetite nanoparticles/Chromium [MNPs/Cr(VI)] adducts. METHODS: The HEK293 cell was exposed to either Cr(VI) or MNPs, or their adducts MNPs/Cr(VI). The cytotoxicity was evaluated by assessing the cell viability, apoptosis, oxidative stress induction, and cellular uptake. RESULTS: The toxicity of formed adducts is significantly reduced when compared to Cr(VI) anions. We found that the cellular uptake of MNPs/Cr(VI) adduct was rare, only few particles were endocytosed from the extracellular fluid and not accumulated in the cell nucleus...
November 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29216573/nitrogen-removal-performance-and-microbial-community-changes-in-subsurface-wastewater-infiltration-systems-swiss-at-low-temperature-with-different-bioaugmentation-strategies
#14
Chunjing Liu, Jianzhi Xie, Manli Song, Zhiling Gao, Dongxing Zheng, Xia Liu, Guohui Ning, Xu Cheng, Harry Bruning
Poor nitrogen removal efficiency (mainly nitrate, NO3--N) at low temperatures strongly limits application of subsurface wastewater infiltration systems (SWISs). Seven psychrophilic strains (heterotrophic nitrifying bacteria and aerobic denitrifying bacteria) were isolated and added to SWISs to investigate the effect of embedding and direct-dosing bioaugmentation strategies on sewage treatment performance at low temperature. Both bioaugmentation strategies improved ammonium (NH4+-N) removal efficiencies, and the embedding strategy also exhibited satisfactory NO3--N and total nitrogen (TN) removal efficiencies...
December 2, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29216487/microplastics-increase-impact-of-treated-wastewater-on-freshwater-microbial-community
#15
Ester M Eckert, Andrea Di Cesare, Marie Therese Kettner, Maria Arias-Andres, Diego Fontaneto, Hans-Peter Grossart, Gianluca Corno
Plastic pollution is a major global concern with several million microplastic particles entering every day freshwater ecosystems via wastewater discharge. Microplastic particles stimulate biofilm formation (plastisphere) throughout the water column and have the potential to affect microbial community structure if they accumulate in pelagic waters, especially enhancing the proliferation of biohazardous bacteria. To test this scenario, we simulated the inflow of treated wastewater into a temperate lake using a continuous culture system with a gradient of concentration of microplastic particles...
December 4, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29216482/enantiomeric-profiling-of-chiral-illicit-drugs-in-a-pan-european-study
#16
Erika Castrignanò, Zhugen Yang, Richard Bade, Jose A Baz-Lomba, Sara Castiglioni, Ana Causanilles, Adrian Covaci, Emma Gracia-Lor, Felix Hernandez, Juliet Kinyua, Ann-Kathrin McCall, Alexander L N van Nuijs, Christoph Ort, Benedek G Plósz, Pedram Ramin, Nikolaos I Rousis, Yeonsuk Ryu, Kevin V Thomas, Pim de Voogt, Ettore Zuccato, Barbara Kasprzyk-Hordern
The aim of this paper is to present the first study on spatial and temporal variation in the enantiomeric profile of chiral drugs in eight European cities. Wastewater-based epidemiology (WBE) and enantioselective analysis were combined to evaluate trends in illicit drug use in the context of their consumption vs direct disposal as well as their synthetic production routes. Spatial variations in amphetamine loads were observed with higher use in Northern European cities. Enantioselective analysis showed a general enrichment of amphetamine with the R-(-)-enantiomer in wastewater indicating its abuse...
December 1, 2017: Water Research
https://www.readbyqxmd.com/read/29216481/robust-performance-of-a-membrane-bioreactor-for-removing-antibiotic-resistance-genes-exposed-to-antibiotics-role-of-membrane-foulants
#17
Yijing Zhu, Yayi Wang, Shuai Zhou, Xuxin Jiang, Xiao Ma, Chao Liu
Antibiotic resistance genes (ARGs) are an emerging concern in wastewater treatment plants (WWTPs), as dissemination of ARGs can pose a serious risk to human health. Few studies, however, have quantified ARGs in membrane bioreactors (MBRs), although MBRs have been widely used for both municipal and industrial wastewater treatment. To reveal the capacity of MBRs for removal of ARGs and the response of membrane fouling after antibiotic exposure, five typical ARG subtypes (sulI, sulII, tetC, tetX and ereA) and int1 were quantified affiliated by systematic membrane foulants analysis in a laboratory-scale anoxic/aerobic membrane bioreactor (A/O-MBR)...
November 30, 2017: Water Research
https://www.readbyqxmd.com/read/29216470/occurrence-and-risk-assessment-of-antibiotics-in-water-and-lettuce-in-ghana
#18
David Azanu, Bjarne Styrishave, Godfred Darko, Johan Juhl Weisser, Robert Clement Abaidoo
Hospital wastewater and effluents from waste stabilization ponds in Kumasi, Ghana, are directly discharged as low quality water into nearby streams which are eventually used to irrigate vegetables. The presence of 12 commonly used antibiotics in Ghana (metronidazole, ciprofloxacin, erythromycin, trimethoprim, ampicillin, cefuroxime, sulfamethoxazole, amoxicillin, tetracycline, oxytetracycline, chlortetracycline and doxycycline) were investigated in water and lettuce samples collected in three different areas in Kumasi, Ghana...
December 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29215767/exposure-to-levonorgestrel-increases-nest-acquisition-success-and-decreases-sperm-motility-in-the-male-fathead-minnow-pimephales-promelas
#19
Tyler Frankel, Lance Yonkos, Franklin Ampy, Jack Frankel
Progestins are utilized as a component of human contraceptives, and enter the environment via wastewater treatment plant effluent. Certain progestins activate fish androgen receptors and cause decreases in fecundity and masculinization of females. In this study, a nest acquisition assay and computer assisted sperm analysis (CASA) was used to examine the effects of levonorgestrel (LNG) on male fathead minnow (Pimephales promelas) reproductive fitness. Males were exposed to 0, 10, or 100ng/L LNG for 14d. Combinations of a control male and a male from one of the treatments were placed into a competitive nesting assay, and time each male spent holding the nest and time spent exhibiting aggressive behaviors were analyzed at 48hrs post-exposure...
December 7, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29215363/nano-tio2-ultrasound-and-sequential-nano-tio2-ultrasonic-degradation-of-n-acetyl-para-aminophenol-from-aqueous-solution
#20
Olushola S Ayanda, Simphiwe M Nelana, Leslie F Petrik, Eliazer B Naidoo
The application of nano-TiO2 as adsorbent combined with ultrasound for the degradation of N-acetyl-para-aminophenol (AAP) from aqueous solution was investigated. The nano-TiO2 was characterized by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR). Experimental results revealed that the adsorption of AAP by nano-TiO2 fitted the pseudo-second-order kinetic model, the equilibrium could be explained by the Freundlich isotherm and the treatment process is exothermic...
October 2017: Journal of Water and Health
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