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https://www.readbyqxmd.com/read/27909924/tailor-made-biocatalysts-based-on-scarcely-studied-acidic-horseradish-peroxidase-for-biodegradation-of-reactive-dyes
#1
Barbara S Janović, Milica Lj Mićić Vićovac, Zoran M Vujčić, Miroslava T Vujčić
Peroxidases (EC 1.11.1.7) have enormous biotechnological applications. Usage of more abundant, basic isoforms of peroxidases in diagnostic kits and/or in immunochemistry has led to under exploitation and disregard of horseradish peroxidase (HRP) acidic isoforms. Therefore, acidic horseradish peroxidase (HRP-A) isoenzyme was used for the preparation of a biocatalyst with improved ability in dye decolorization. Ten biocatalysts were prepared by covalent binding of enzyme to chitosan and alginate, adsorption followed by cross-linking on inorganic support (aluminum oxide), and encapsulation in spherical calcium alginate beads via polyethylene glycol...
December 1, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27909849/monitoring-contaminants-of-emerging-concern-from-tertiary-wastewater-treatment-plants-using-passive-sampling-modelled-with-performance-reference-compounds
#2
Tamanna Sultana, Craig Murray, M Ehsanul Hoque, Chris D Metcalfe
The Lake Simcoe watershed in Ontario, Canada is an important recreational area and a recharge zone for groundwater resources. Lake Simcoe is a relatively shallow lotic system that has been impacted by urban development, recreation, industry and agriculture. As part of a watershed management plan, six wastewater treatment plants (WWTPs) located in this catchment basin were selected to measure the inputs of contaminants of emerging concern (CECs) of wastewater origin. These WWTPs were recently upgraded to tertiary treatment for phosphorus removal...
December 2016: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27908456/wastewater-based-epidemiology-to-assess-human-exposure-to-pyrethroid-pesticides
#3
Nikolaos I Rousis, Ettore Zuccato, Sara Castiglioni
Pesticides are active substances with potentially adverse effects on human health, and therefore great effort is addressed to study the relation between their widespread use and the effects on humans. To track human exposure to pesticides, novel approaches are needed to give additional information on exposure at population level. In this study, a novel application of Wastewater-Based Epidemiology (WBE) was developed to measure the intake of pyrethroid pesticides in a population. Three human urinary metabolites of pyrethroids were selected and validated as biomarkers of exposure by evaluating their sources and stability in wastewater...
November 28, 2016: Environment International
https://www.readbyqxmd.com/read/27908452/kinetics-and-mechanisms-of-nitrate-and-ammonium-formation-during-ozonation-of-dissolved-organic-nitrogen
#4
Glen Andrew de Vera, Wolfgang Gernjak, Howard Weinberg, Maria José Farré, Jurg Keller, Urs von Gunten
Dissolved organic nitrogen (DON) is an emerging concern in oxidative water treatment because it exerts oxidant demand and may form nitrogenous oxidation/disinfection by-products. In this study, we investigated the reactions of ozone with DON with a special emphasis on the formation of nitrate (NO3(-)) and ammonium (NH4(+)). In batch ozonation experiments, the formation of NO3(-) and NH4(+) was investigated for natural organic matter standards, surface water, and wastewater effluent samples. A good correlation was found between NO3(-) formation and the O3 exposure (R(2) > 0...
October 8, 2016: Water Research
https://www.readbyqxmd.com/read/27907122/biodegradation-of-methyl-tertiary-butyl-ether-mtbe-by-a-microbial-consortium-in-a-continuous-up-flow-packed-bed-biofilm-reactor-kinetic-study-metabolite-identification-and-toxicity-bioassays
#5
Guadalupe Alfonso-Gordillo, César Mateo Flores-Ortiz, Liliana Morales-Barrera, Eliseo Cristiani-Urbina
This study investigated the aerobic biodegradation of methyl tertiary-butyl ether (MTBE) by a microbial consortium in a continuous up-flow packed-bed biofilm reactor using tezontle stone particles as a supporting material for the biofilm. Although MTBE is toxic for microbial communities, the microbial consortium used here was able to resist MTBE loading rates up to 128.3 mg L-1 h-1, with removal efficiencies of MTBE and chemical oxygen demand (COD) higher than 90%. A linear relationship was observed between the MTBE loading rate and the MTBE removal rate, as well as between the COD loading rate and the COD removal rate, within the interval of MTBE loading rates from 11...
2016: PloS One
https://www.readbyqxmd.com/read/27907117/the-composition-and-spatial-patterns-of-bacterial-virulence-factors-and-antibiotic-resistance-genes-in-19-wastewater-treatment-plants
#6
Bing Zhang, Yu Xia, Xianghua Wen, Xiaohui Wang, Yunfeng Yang, Jizhong Zhou, Yu Zhang
Bacterial pathogenicity and antibiotic resistance are of concern for environmental safety and public health. Accumulating evidence suggests that wastewater treatment plants (WWTPs) are as an important sink and source of pathogens and antibiotic resistance genes (ARGs). Virulence genes (encoding virulence factors) are good indicators for bacterial pathogenic potentials. To achieve a comprehensive understanding of bacterial pathogenic potentials and antibiotic resistance in WWTPs, bacterial virulence genes and ARGs in 19 WWTPs covering a majority of latitudinal zones of China were surveyed by using GeoChip 4...
2016: PloS One
https://www.readbyqxmd.com/read/27905538/potential-and-optimization-of-two-phase-anaerobic-digestion-of-oil-refinery-waste-activated-sludge-and-microbial-community-study
#7
Qinghong Wang, Ying Liang, Peng Zhao, Qing X Li, Shaohui Guo, Chunmao Chen
Oil refinery waste activated sludge produced from oil wastewater biological treatment is a major industrial sludge. Two-phase anaerobic digestion of oil refinery waste activated sludge was studied for the first time. Thermal pretreatment under 170 °C is effective on sludge solubilization. At the optimum hydrolytic-acidogenic condition which was pH of 6.5, temperature of 55 °C and HRT of 2 days, 2754 mg/L volatile fatty acids (VFAs) were produced and acetic acid and butyric acid were the key components...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27902305/flavobacterium-cloacae-sp-nov-isolated-from-waste-water
#8
Hongming Liu, Peng Lu, Guoping Zhu
A Gram-stain-negative, non-spore-forming, rod-shaped, non-motile bacterium, named wh15T, was isolated from the waste water of a municipal wastewater treatment plant in Wuhu, China. The taxonomic status of the strain was characterized using a polyphasic taxonomic approach. Growth occurred at 15-45 °C (optimum, 25-40 °C), at pH 5.0-8.0 (optimum, pH 7.0) and with 0-4% NaCl (optimum, 1-2%). Phylogenetic analyses based on 16S rRNA gene sequence revealed that strain wh15T was a member of genus Flavobacterium and shared the highest similarity with F...
November 21, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27902260/flavobacterium-luticocti-sp-nov-isolated-from-waste-water
#9
Hongming Liu, Peng Lu, Lei Jin, Guoping Zhu
A Gram-stain-negative, non-spore-forming, rod-shaped and non-motile bacterium, named xz20T, was isolated from the waste water of a municipal wastewater treatment plant in Xuzhou, China. The taxonomic status of strain xz20T was characterized using a polyphasic taxonomic approach. Growth occurred at 15-40°C (optimum, 25-37°C), at pH 6.0-8.5 (optimum, pH 7.0) and with 0-3% NaCl (optimum, 1-2%). 16S rRNA gene sequence analysis revealed that strain xz20T was a member of the genus Flavobacterium and shared the highest similarity with F...
November 3, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27901630/emerging-pollutant-treatments-in-wastewater-cases-of-antibiotics-and-hormones
#10
Erika Méndez, Miguel A González-Fuentes, Georgette Rebollar-Perez, Alia Méndez-Albores, Eduardo Torres
Because of the intensive use of pharmaceutical substances in human life, studies on the detection of these chemical compounds and their metabolites as pollutants in water bodies are continuously reported. Some pharmaceutical agents are associated with adverse effects to aquatic life, even at very low concentrations (ng L(-1) to μg L(-1)). For instance, the presence of antibiotics and hormones has been associated with increasing proliferation of antibiotic resistant pathogens and feminization and masculinization of some aquatic organisms...
November 30, 2016: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/27898796/sorption-of-pharmaceuticals-heavy-metals-and-herbicides-to-biochar-in-the-presence-of-biosolids
#11
Daniel A Bair, Fungai N D Mukome, Inna E Popova, Temitope A Ogunyoku, Allie Jefferson, Daoyuan Wang, Sarah C Hafner, Thomas M Young, Sanjai J Parikh
Agricultural practices are increasingly incorporating recycled waste materials, such as biosolids, to provide plant nutrients and enhance soil functions. Although biosolids provide benefits to soil, municipal wastewater treatment plants receive pharmaceuticals and heavy metals that can accumulate in biosolids, and land application of biosolids can transfer these contaminants to the soil. Environmental exposure of these contaminants may adversely affect wildlife, disrupt microbial communities, detrimentally affect human health through long-term exposure, and cause the proliferation of antibiotic-resistant bacteria...
November 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27898334/relative-contribution-of-ammonia-oxidizing-bacteria-and-other-members-of-nitrifying-activated-sludge-communities-to-micropollutant-biotransformation
#12
Yujie Men, Stefan Achermann, Damian E Helbling, David R Johnson, Kathrin Fenner
Improved micropollutant (MP) biotransformation during biological wastewater treatment has been associated with high ammonia oxidation activities, suggesting co-metabolic biotransformation by ammonia oxidizing bacteria as an underlying mechanism. The goal of this study was to clarify the contribution of ammonia oxidizing bacteria to increased MP degradation in nitrifying activated sludge (NAS) communities using a series of inhibition experiments. To this end, we treated a NAS community with two different ammonia oxidation inhibitors, namely octyne (OCT), a mechanistic inhibitor that covalently binds to ammonia monooxygenases, and allylthiourea (ATU), a copper chelator that depletes copper ions from the active center of ammonia monooxygenases...
November 22, 2016: Water Research
https://www.readbyqxmd.com/read/27898329/simultaneous-removal-of-structurally-different-pesticides-in-a-biomixture-detoxification-and-effect-of-oxytetracycline
#13
Alejandra Huete-Soto, Mario Masís-Mora, Verónica Lizano-Fallas, Juan Salvador Chin-Pampillo, Elizabeth Carazo-Rojas, Carlos E Rodríguez-Rodríguez
The biopurification systems (BPS) used for the treatment of pesticide-containing wastewater must present a versatile degrading ability, in order to remove different active ingredients according to the crop protection programs. This work aimed to assay the simultaneous removal of several pesticides (combinations of herbicides/insecticides/fungicides, or insecticides/fungicides) in a biomixture used in a BPS over a period of 115 d, and in the presence of oxytetracycline (OTC), an antibiotic of agricultural use that could be present in wastewater from agricultural pesticide application practices...
November 26, 2016: Chemosphere
https://www.readbyqxmd.com/read/27898316/effects-of-iron-and-calcium-carbonate-on-the-variation-and-cycling-of-carbon-source-in-integrated-wastewater-treatments
#14
Zhao Zhimiao, Song Xinshan, Zhao Yufeng, Xiao Yanping, Wang Yuhui, Wang Junfeng, Yan Denghua
Iron and calcium carbonate were added in wastewater treatments as the adjusting agents to improve the contaminant removal performance and regulate the variation of carbon source in integrated treatments. At different temperatures, the addition of the adjusting agents obviously improved the nitrogen and phosphorous removals. TN and TP removals were respectively increased by 29.41% and 23.83% in AC-100 treatment under 1-day HRT. Carbon source from dead algae was supplied as green microbial carbon source and Fe(2+) was supplied as carbon source surrogate...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27892816/optimization-of-the-pretreatment-of-wastewater-from-a-slaughterhouse-and-packing-plant-through-electrocoagulation-in-a-batch-reactor
#15
Fábio Orssatto, Maria Hermínia Ferreira Tavares, Flávia Manente da Silva, Eduardo Eyng, Brendown Faria Biassi, Leandro Fleck
The purpose of this study is to evaluate the removal of COD (chemical oxygen demand), turbidity and color of wastewater from a pig slaughterhouse and packing plant through the electrochemical technique and to optimize the ΔV(electric potential difference) and HRT (hydraulic retention time) variables in an electrocoagulation batch reactor using aluminum electrodes. The experimental design used was RCCD (Rotatable Central Composite Design). The characteristics of the effluent were 4730 mg L(-1) to COD, 0.0 mg L(-1) to total aluminum, 6...
November 28, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27889658/chlorella-vulgaris-cultivation-in-sludge-extracts-from-2-4-6-tcp-wastewater-treatment-for-toxicity-removal-and-utilization
#16
Lu Wang, Xiurong Chen, Hualin Wang, Yuying Zhang, Qingjie Tang, Jiahui Li
Chlorella vulgaris was cultivated in different proportions of activated sludge extracts, which was from the treatment of the synthetic wastewater containing 2,4,6-trichlorophenol (2,4,6-TCP). The nutrients, total nitrogen (TN) and total phosphorus (TP), were removed over 45% and 90%, respectively. The maximum reduction amount of ecotoxicity and total organic carbon (TOC) occurred in the 100% sludge group on the 8th day (68%; 86.2 mg L(-1)). The variations of Excitation-emission matrix spectra (EEMs) and TOC indicated that extracellular organic matters (EOM) produced by algae led to TOC increase in the medium...
November 24, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27889657/evaluation-of-fertilizer-drawn-forward-osmosis-for-sustainable-agriculture-and-water-reuse-in-arid-regions
#17
Laura Chekli, Youngjin Kim, Sherub Phuntsho, Sheng Li, Noreddine Ghaffour, TorOve Leiknes, Ho Kyong Shon
The present study focused on the performance of the FDFO process to achieve simultaneous water reuse from wastewater and production of nutrient solution for hydroponic application. Bio-methane potential (BMP) measurements were firstly carried out to determine the effect of osmotic concentration of wastewater achieved in the FDFO process on the anaerobic activity. Results showed that 95% water recovery from the FDFO process is the optimum value for further AnMBR treatment. Nine different fertilizers were then tested based on their FO performance (i...
November 24, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27889353/review-on-fate-and-mechanism-of-removal-of-pharmaceutical-pollutants-from-wastewater-using-biological-approach
#18
REVIEW
Bhagyashree Tiwari, Balasubramanian Sellamuthu, Yassine Ouarda, Patrick Drogui, Rajeshwar D Tyagi, Gerardo Buelna
Due to research advancement and discoveries in the field of medical science, maintains and provides better human health and safer life, which lead to high demand for production of pharmaceutical compounds with a concomitant increase in population. These pharmaceutical (biologically active) compounds were not fully metabolized by the body and excreted out in wastewater. This micro-pollutant remains unchanged during wastewater treatment plant operation and enters into the receiving environment via the discharge of treated water...
November 15, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27889212/study-of-the-effect-of-the-bacterial-and-fungal-communities-present-in-real-wastewater-effluents-on-the-performance-of-fungal-treatments
#19
Marina Badia-Fabregat, Daniel Lucas, Tero Tuomivirta, Hannu Fritze, Taina Pennanen, Sara Rodríguez-Mozaz, Damià Barceló, Glòria Caminal, Teresa Vicent
The use of the ligninolytic fungi Trametes versicolor for the degradation of micropollutants has been widely studied. However, few studies have addressed the treatment of real wastewater containing pharmaceutically active compounds (PhAC) under non-sterile conditions. The main drawback of performing such treatments is the difficulty for the inoculated fungus to successfully compete with the other microorganisms growing in the bioreactor. In the present study, several fungal treatments were performed under non-sterile conditions in continuous operational mode with two types of real wastewater effluent, namely, a reverse osmosis concentrate (ROC) from a wastewater treatment plant and a veterinary hospital wastewater (VHW)...
November 23, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27889087/characterisation-of-the-phenanthrene-degradation-related-genes-and-degrading-ability-of-a-newly-isolated-copper-tolerant-bacterium
#20
Mengke Song, Ying Yang, Longfei Jiang, Qing Hong, Dayi Zhang, Zhenguo Shen, Hua Yin, Chunling Luo
A copper-tolerant phenanthrene (PHE)-degrading bacterium, strain Sphingobium sp. PHE-1, was newly isolated from the activated sludge in a wastewater treatment plant. Two key genes, ahdA1b-1 encoding polycyclic aromatic hydrocarbon ring-hydroxylating dioxygenase (PAH-RHDɑ) and xyLE encoding catechol-2,3-dioxygenase (C23O), involved in the PHE metabolism by strain PHE-1 were identified. The PAH-RHD gene cluster showed 96% identity with the same cluster of Sphingomonas sp. P2. Our results indicated the induced transcription of xylE and ahdA1b-1 genes by PHE, simultaneously promoted by Cu(II)...
November 23, 2016: Environmental Pollution
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