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https://www.readbyqxmd.com/read/28437843/a-bayesian-belief-network-model-assessing-the-risk-to-wastewater-workers-of-contracting-ebola-virus-disease-during-an-outbreak
#1
Joseph W Zabinski, Kelsey J Pieper, Jacqueline MacDonald Gibson
During an outbreak of Ebola virus disease (EVD), hospitals' connections to municipal wastewater systems may provide a path for patient waste bearing infectious viral particles to pass from the hospital into the wastewater treatment system, potentially posing risks to sewer and wastewater workers. To quantify these risks, we developed a Bayesian belief network model incorporating data on virus behavior and survival along with structural characteristics of hospitals and wastewater treatment systems. We applied the model to assess risks under several different scenarios of workers' exposure to wastewater for a wastewater system typical of a mid-sized U...
April 24, 2017: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/28437742/biological-treatment-of-model-dyes-and-textile-wastewaters
#2
Alicia Paz, Julia Carballo, María José Pérez, José Manuel Domínguez
Previous works conducted in our laboratory, reveled that Bacillus aryabhattai DC100 produce ligninolytic enzymes such as laccases and/or peroxidases, opening new applications in different bioprocesses, including the treatment of disposal residues such as dyestuffs from textile processing industries. This work described the degradation of three commercial model dyes Coomassie Brilliant Blue G-250 (CBB), Indigo Carmine (IC) and Remazol Brilliant Blue R (RBBR) under different culture media and operational conditions...
April 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28437728/is-a-a-o-process-effective-in-toxicity-removal-case-study-with-coking-wastewater
#3
Liu Shi, Dong Wang, Di Cao, Chunhong Na, Xie Quan, Ying Zhang
The anaerobic-anoxic-oxic (A/A/O) process is the commonly used biological wastewater treatment process, especially for the coking wastewater. However, limit is known about its ability in bio-toxicity removal from wastewater. In this study, we evaluated the performance of A/A/O process in bio-toxicity removal from the coking wastewater, using two test species (i.e. crustacean (Daphnia magna) and zebra fish (Danio rerio)) in respect of acute toxicity, oxidative damage and genotoxicity. Our results showed that the acute toxicity of raw influent was reduced gradually along with A/A/O process and the effluent presented no acute toxicity to Daphnia magna (D...
April 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28437724/synthesis-of-zno-nanorod-based-materials-for-antibacterial-antifungal-activities-dna-cleavage-and-efficient-ultrasound-assisted-dyes-adsorption
#4
Ali Akbar Bazrafshan, Mehrorang Ghaedi, Shaaker Hajati, Reza Naghiha, Arash Asfaram
Undoped and Au-doped ZnO-nanorods were synthesized in the presence of ultrasound and loaded on activated carbon following characterization by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), UV-vis spectrophotometry and Fourier transform infrared spectroscopy (FTIR). The Au-doped ZnO-nanorod-loaded activated carbon (Au-ZnO-NRs-AC) was used for the simultaneous removal of methylene blue (MB) and auramine O (AO) from aqueous solutions. Central composite design (CCD) under response surface methodology (RSM) was applied to model and optimize the dyes removal versus adsorbent mass, pH, and initial dyes concentration and sonication time as well as to investigate the possible interaction between these variables...
April 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28436824/efficient-treatment-of-aniline-containing-wastewater-in-bipolar-membrane-microbial-electrolysis-cell-fenton-system
#5
Xiaohu Li, Xiangdan Jin, Nannan Zhao, Irini Angelidaki, Yifeng Zhang
Aniline-containing wastewater can cause significant environmental problems and threaten the humans's life. However, rapid degradation of aniline with cost-efficient methods remains a challenge. In this work, a novel microbial electrolysis cell with bipolar membrane was integrated with Fenton reaction (MEC-Fenton) for efficient treatment of real wastewater containing a high concentration (4460 ± 52 mg L(-1)) of aniline. In this system, H2O2 was in situ electro-synthesized from O2 reduction on the graphite cathode and was simultaneously used as source of OH for the oxidation of aniline wastewater under an acidic condition maintained by the bipolar membrane...
April 19, 2017: Water Research
https://www.readbyqxmd.com/read/28436692/rhizospheric-soil-enzyme-activities-and-phytominimg-potential-of-aeluropus-lagopoides-and-cyperus-conglomeratus-growing-in-contaminated-soils-at-the-banks-of-artificial-lake-of-reclaimed-wastewater
#6
Zahid Khorshid Abbas
This work investigates the phytoremediation potential of Aeluropus lagopoides and Cyperus conglomeratus, growing indigenously in the vicinity of artificial lake of reclaimed water in Tabuk, Saudi Arabia. The sampling sites were located at different distance from the waste water treatment plants. Trace metal contents were higher in roots than shoots in both these plants. Soil urease activity in rhizophere increased linearly along the sampling sites, however, soil alkaline phosphatase and β-glucosidase activities was greater at site 2 but were declined at site 3...
April 24, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28436685/factors-affecting-the-performance-of-horizontal-flow-constructed-treatment-wetland-vegetated-with-cyperus-papyrus-for-municipal-wastewater-treatment
#7
Sohair I Abou-Elela, Mohamed A Elekhnawy, Magdy T Khalil, Mohamed S Hellal
The effect of hydraulic loading rate (HLR) and hydraulic retention time (HRT) on the bioremediation of municipal wastewater using a pilot scale subsurface horizontal flow constructed treatment wetland (HFCTW) vegetated with Cyprus papyrus was investigated. Three different HLRs were applied to the treatment system namely; 0.18, 0.10 and 0.07 m(3)/m(2). d with corresponding HRTs of 1.8, 3.2 and 4.7 days, respectively. The flow rate was 8 m(3)/ d and the average organic loading rate (OLR) was 0.037 kg BOD/m(3)/d...
April 24, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28436645/rethinking-wastewater-treatment-plant-effluent-standards-nutrient-reduction-or-nutrient-control
#8
Alexander T W M Hendriks, Jeroen G Langeveld
No abstract text is available yet for this article.
April 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28436522/integrated-hydrogen-evolution-and-water-cleaning-via-a-robust-graphene-supported-noble-metal-free-fe1-xcoxs2-system
#9
Yingying Fan, Dandan Wang, Dongxue Han, Yingming Ma, Shuang Ni, Zhonghui Sun, Xiandui Dong, Li Niu
In an electrocatalytic hydrogen evolution reaction (HER) system, a cathodic H(+) resource, an anodic sacrificial agent and a robust catalyst are three essential factors. Industry wastewater emissions, containing high levels of acidity and organic dyes, actually can satisfy the material requirements for the HER. Herein, a new HER method is proposed, taking acidic ions from wastewater as a cathodic resource to produce H2, while organic dye waste acts as an anodic sacrifice to balance the reaction. In such a way, a sustainable H2 energy source can be generated and clean water is obtained as well...
April 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28436521/well-incorporation-of-carbon-nanodots-with-silicon-nanowire-arrays-featuring-excellent-photocatalytic-performances
#10
Chia-Yun Chen, Po-Hsuan Hsiao, Ta-Cheng Wei, Ting-Chen Chen, Chien-Hsin Tang
Recently, silicon (Si) nanowires have been intensively applied for a wide range of optoelectronic applications. Nevertheless, rare explorations considering the photodegradation of organic pollutants based on Si nanowires were performed, and they still require vast improvement, in particular for their degradation efficiency. In this study, broad-band and high efficiency photocatalytic systems were demonstrated through the good incorporation of Si nanowires with highly fluorescent carbon nanodots. The photodegradation rate of these intriguing heterostructure arrays under a 580 nm light illumination is approximately 6 times higher than that of sole Si nanowires, and more than 3...
April 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28435877/design-and-function-of-biomimetic-multilayer-water-purification-membranes
#11
Shengjie Ling, Zhao Qin, Wenwen Huang, Sufeng Cao, David L Kaplan, Markus J Buehler
Multilayer architectures in water purification membranes enable increased water throughput, high filter efficiency, and high molecular loading capacity. However, the preparation of membranes with well-organized multilayer structures, starting from the nanoscale to maximize filtration efficiency, remains a challenge. We report a complete strategy to fully realize a novel biomaterial-based multilayer nanoporous membrane via the integration of computational simulation and experimental fabrication. Our comparative computational simulations, based on coarse-grained models of protein nanofibrils and mineral plates, reveal that the multilayer structure can only form with weak interactions between nanofibrils and mineral plates...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28434820/interrelationships-of-metal-transfer-factor-under-wastewater-reuse-and-soil-pollution
#12
D Papaioannou, I K Kalavrouziotis, P H Koukoulakis, F Papadopoulos, P Psoma
The transfer of heavy metals under soil pollution wastewater reuse was studied in a Greenhouse experiment using a randomized block design, including 6 treatments of heavy metals mixtures composed of Zn, Mn, Cd, Co, Cu, Cr, Ni, and Pb, where each metal was taking part in the mixture with 0, 10, 20, 30, 40, 50 mg/kg respectively, in four replications. The Beta vulgaris L (beet) was used as a test plant. It was found that the metal transfer factors were statistically significantly related to the: (i) DTPA extractable soil metals, (ii) the soil pollution level as assessed by the pollution indices, (iii) the soil pH, (iv) the beet dry matter yield and (v) the interactions between the heavy metals in the soil...
April 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28434787/integrated-ecotechnology-approach-towards-treatment-of-complex-wastewater-with-simultaneous-bioenergy-production
#13
Manupati Hemalatha, J Shanthi Sravan, Dileep Kumar Yeruva, S Venkata Mohan
Sequential integration of three stage diverse biological processes was studied by exploiting the individual process advantage towards enhanced treatment of complex chemical based wastewater. A successful attempt to integrate sequence batch reactor (SBR) with bioelectrochemical treatment (BET) and finally with microalgae treatment was studied. The sequential integration has showed individual substrate degradation (COD) of 55% in SBR, 49% in BET and 56% in microalgae, accounting for a consolidated treatment efficiency of 90%...
March 22, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28434758/mallards-anas-platyrhynchos-and-wastewater-ponds-part-ii-developmental-physiological-morphological-and-behavioural-effects-of-ingestion-of-secondary-clarified-effluent-water
#14
K B Tierney, P O Welsh, M Mills, S Nason, D R Barreda, C A Paszkowski
Rather than migrating, mallard ducks may choose to overwinter in northern cities on open-water thermal refuges, such as municipal wastewater treatment ponds, which in Edmonton, Canada, stay ≥10°C during frigid winter months. Refuging mallards spend appreciable time daily on these ponds and hydrate using secondary clarified municipal wastewater (SCEW). We aimed to determine if SCEW ingestion affected mallard health. To this end, we gavaged newly hatched mallards (domesticated Pekin strain) over their first month with SCEW, as well as water representing negative and positive controls (municipal tap water, and the primary active ingredient from birth control pills, 17α-ethinyl estradiol (EE2), respectively)...
April 20, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28434711/validation-of-an-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry-method-to-quantify-illicit-drug-and-pharmaceutical-residues-in-wastewater-using-accuracy-profile-approach
#15
Cécile Hubert, Martin Roosen, Yves Levi, Sara Karolak
The analysis of biomarkers in wastewater has become a common approach to assess community behavior. This method is an interesting way to estimate illicit drug consumption in a given population: by using a back calculation method, it is therefore possible to quantify the amount of a specific drug used in a community and to assess the consumption variation at different times and locations. Such a method needs reliable analytical data since the determination of a concentration in the ngL(-1) range in a complex matrix is difficult and not easily reproducible...
April 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28434286/degradation-of-triclosan-and-its-main-intermediates-during-the-combined-irradiation-and-biological-treatment
#16
Shizong Wang, Jianlong Wang
Triclosan is an extensively applied antimicrobial agent which has been frequently detected in the environment. In this paper, the degradation of triclosan and its main intermediates was investigated during the combined irradiation and biological treatment. The results showed that triclosan degradation increased with increase of absorbed dose, the removal efficiency of triclosan was 62%, 77%, 87%, 91% and 94%, respectively at 1, 2, 3, 4 and 5 kGy. The final removal efficiency of triclosan after the combined irradiation and biological process were 81%, 86%, 90%, 92% and 95%, respectively...
April 24, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28433880/predicting-trace-organic-compound-attenuation-by-ozone-oxidation-development-of-indicator-and-surrogate-models
#17
Minkyu Park, Tarun Anumol, Kevin D Daniels, Shimin Wu, Austin D Ziska, Shane A Snyder
Ozone oxidation has been demonstrated to be an effective treatment process for the attenuation of trace organic compounds (TOrCs); however, predicting TOrC attenuation by ozone processes is challenging in wastewaters. Since ozone is rapidly consumed, determining the exposure times of ozone and hydroxyl radical proves to be difficult. As direct potable reuse schemes continue to gain traction, there is an increasing need for the development of real-time monitoring strategies for TOrC abatement in ozone oxidation processes...
April 10, 2017: Water Research
https://www.readbyqxmd.com/read/28433767/temporal-dynamics-of-human-excreted-pollutants-in-wastewater-treatment-plant-influents-toward-a-better-knowledge-of-mass-load-fluctuations
#18
Thomas Thiebault, Laëtitia Fougère, Emilie Destandau, Maxime Réty, Jérémy Jacob
The occurrence of 25 drug target residues (illicit drugs or pharmaceutically active compounds) was investigated during 85 consecutive days in the influents of a wastewater treatment plant in the Region Centre-Val de Loire, France. This long tracking period allowed a better understanding of the patterns affecting the occurrence of this type of contaminants. Among them, 2 were never detected (i.e. heroin and amphetamine). Concerning illicit drugs two patterns were found. Cocaine and ecstasy median loads varied considerably between weekdays and weekend days (i...
April 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28433692/enhanced-biological-phosphorus-removal-at-low-sludge-retention-time-in-view-of-its-integration-in-a-stage-systems
#19
Carlos Chan, Albert Guisasola, Juan Antonio Baeza
The two-stage A/B WWTP configuration is being studied as a possible wastewater treatment with low energy consumption or even with a net energy generation. The first phase, A-stage, is designed to remove organic matter at very short Sludge Retention Time (SRT), while the B-stage is based on autotrophic nitrogen removal. However, P-removal in the A/B process usually only relies on precipitation. This work studies the potential inclusion of Enhanced Biological Phosphorus Removal (EBPR) in the A-stage phase. For this aim, the long-term operation of three different Sequencing Batch Reactors (SBR) enriched in Accumulibacter at low SRT was thoroughly monitored for more than three months each one...
April 9, 2017: Water Research
https://www.readbyqxmd.com/read/28433683/municipal-wastewater-sludge-as-a-sustainable-bioresource-in-the-united-states
#20
Timothy E Seiple, André M Coleman, Richard L Skaggs
Within the United States and Puerto Rico, publicly owned treatment works (POTWs) process 130.5 Gl/d (34.5 Bgal/d) of wastewater, producing sludge as a waste product. Emerging technologies offer novel waste-to-energy pathways through whole sludge conversion into biofuels. Assessing the feasibility, scalability and tradeoffs of various energy conversion pathways is difficult in the absence of highly spatially resolved estimates of sludge production. In this study, average wastewater solids concentrations and removal rates, and site specific daily average influent flow are used to estimate site specific annual sludge production on a dry weight basis for >15,000 POTWs...
April 20, 2017: Journal of Environmental Management
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