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Ze Liu, Seyedahmad Hosseinzadeh, Niels Wardenier, Yannick Verheust, Michael Chys, Stijn Van Hulle
The degradation of micropollutants (MPs), including pesticides, herbicides, pharmaceuticals and endocrine disrupting compounds, by ozone-based advanced oxidation techniques (AOP) was investigated in this study. The effect of different factors, such as ozone concentration, hydrogen peroxide concentration and initial pH, on the removal rate was studied in detail. The combination of UV with ozone/ H2 O2 increased the MPs degradation. For example, atrazine removal increased from 12.6% to 66.9%. Increasing the concentration of ozone and H2 O2 can enhance the degradation efficiency of MPs, while excess H2 O2 plays a role as scavenger for OH...
June 20, 2018: Environmental Technology
Maegala Nallapan Maniyam, Abdul Latif Ibrahim, Anthony E G Cass
In the present study, locally isolated Rhodococcus strains were attempted as biological tools for methyl red removal, a mutagenic azo dye posing threat to the environment if left untreated. Rhodococcus strain UCC 0016 demonstrated superior methyl red-decolourizing activity of 100% after 24 hours at static condition in comparison to Rhodococcus strain UCC 0008 which recorded 65% decolourization after 72 hours. Optimization of physicochemical parameters at 30 °C, pH 7 and supplementing glucose as the carbon source resulted in improved methyl red-decolourizing activity at static condition and reduced the time taken to achieve complete decolourization by 80%...
June 20, 2018: Environmental Technology
Chewapat Saejung, Pongsathorn Salasook
The bioconversion of sugar-industry wastewater to value-added products is a prominent topic in biotechnology. This work cultured a carotenoid-producing photosynthetic bacterium, Rhodopseudomonas faecalis, in a photo-bioreactor containing different wastewater from wastewater treatment ponds of a Thai sugar company. The cultivated R. faecalis produced single cell protein (SCP) with supplemental carotenoids. The cultivation boosted the growth and dehydrogenase activity of R. faecalis from all wastewater sources, while significantly reducing the total sugar concentration...
June 20, 2018: Environmental Technology
Yovana Todorova, Ivaylo Yotinov, Yana Topalova, Evgenia Benova, Plamena Marinova, Ivan Tsonev, Todor Bogdanov
Plasma-based technologies take an increasing place in the new conceptions of wastewater management as a promising tool for the treatment of persistent organic pollutants with low biodegradability. Plasma major advantage is the synergy of diverse active components with high oxidative action and additional benefits as disinfection of treated water. But the bactericidal effect of plasma can influence the treatment effectiveness when this technology is used in combination with biological methods for removal of pollutants...
June 20, 2018: Environmental Technology
Joanna Żur, Artur Piński, Ariel Marchlewicz, Katarzyna Hupert-Kocurek, Danuta Wojcieszyńska, Urszula Guzik
Currently, analgesics and nonsteroidal anti-inflammatory drugs (NSAIDs) are classified as one of the most emerging group of xenobiotics and have been detected in various natural matrices. Among them, monocyclic paracetamol and ibuprofen, widely used to treat mild and moderate pain are the most popular. Since long-term adverse effects of these xenobiotics and their biological and pharmacokinetic activity especially at environmentally relevant concentrations are better understood, degradation of such contaminants has become a major concern...
June 19, 2018: Environmental Science and Pollution Research International
Reza Ranjbar, Omid Farahani
Background: Due to the widespread different pathogenic strains, Escherichia coli lead many severe to normal diseases worldwide. Finding the relation of clones with genomic content and clinical features is a key point to recognize the high potential-invasive strains. Specific virulence factors include adhesions, invasions, toxins, and capsule are the main determinants of pathogenic factors of E. coli strains. Methods: From Jun 2014 to Jun 2016, E. coli isolates recovered using standard bacteriological methods from wastewater sources in different hospitals in Tehran, Iran, were monitored to recognize the virulence genes by polymerase chain reaction (PCR) assay...
May 2018: Iranian Journal of Public Health
Dongyang Liu, Chenyang Cui, Yanhong Wu, Huiying Chen, Junfeng Geng, Jianxin Xia
A new approach, based on dielectrophoresis (DEP), was developed in this work to enhance traditional adsorption for the removal of ammonia nitrogen (NH3 -N) from wastewater. The factors that affected the removal efficiency were systematically investigated, which allowed us to determine optimal operation parameters. With this new method we found that the removal efficiency was significantly improved from 66.7% by adsorption only to 95% by adsorption-DEP using titanium metal mesh as electrodes of the DEP and zeolite as the absorbent material...
2018: PeerJ
Yanjie Wang, Huachun Lan, Lin Li, Kaixiong Yang, Jiuhui Qu, Junxin Liu
Sampling was conducted from biochemical reaction tanks of six municipal wastewater treatment plants in the Yangtze River and Zhujiang deltas and the Jing-Jin-Ji region to assess their morphology, level, and composition. Morphological observations suggested that particles were scattered amorphously with C, O, and Si as the major elements. Bioaerosols are composed of spatially varying levels of microorganisms and chemicals. As the sampling height increased, the level of the components in the bioaerosols decreased...
June 19, 2018: Scientific Reports
Jing Li, Chao Qiu, Haoran Fan, Yuxiang Bai, Zhengyu Jin, Jinpeng Wang
A novel cyclodextrin-functionalized hybrid silicon nano-adsorbent material (6-EA-β-CD-Si) was synthesized via the nucleophilic substitution method. The structure was detected by Fourier transform infrared (FT-IR), X-ray, thermogravimetric analysis, and Brunauer-Emmett-Teller (BET) analysis. Results reveal that the BET surface area of 6-EA-β-CD-Si is 240 m²/g and the average pore size is 4.16 nm. The adsorption properties of 6-EA-β-CD-Si onto methylene blue (MB) were studied and fitted with adsorption kinetic models...
June 19, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Pavel Bulejko
Hollow-fiber membranes (HFMs) have been widely applied to many liquid treatment applications such as wastewater treatment, membrane contactors/bioreactors and membrane distillation. Despite the fact that HFMs are widely used for gas separation from gas mixtures, their use for mechanical filtration of aerosols is very scarce. In this work, we compared mathematical models developed for the prediction of air filtration efficiency by applying them on the structural parameters of polypropylene HFMs. These membranes are characteristic of pore diameters of about 90 nm and have high solidity, thus providing high potential for nanoparticle removal from air...
June 19, 2018: Nanomaterials
Ali Shahvar, Roozbeh Soltani, Mohammad Saraji, Mohammad Dinari, Shekoufe Alijani
Herein, nano-sized covalent triazine-based framework grafted magnetic particles were synthesized by a facile Friedel-Crafts reaction between cyanuric chloride as node and biphenyl as linker. The formation of the material has been confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, field emission-scanning electron microscopy, thermogravimetric analysis, and N2 adsorption-desorption measurement. With respect to the material structure, the large number of aromatic rings in the molecular framework provided a bed for extracting aromatic ring-containing compounds through π-π stacking interactions...
June 16, 2018: Journal of Chromatography. A
Nicole D Wagner, André J Simpson, Myrna J Simpson
Anthropogenic activity is increasing the presence of contaminants that enter waterways through wastewater effluent and urban and/or agricultural runoff, generally in complex mixtures. Depending on the mode of action of the individual contaminant within the mixture, toxicity can occur due to contaminants having similar or dissimilar modes of action. However, it is unknown how the metabolome responds to sub-lethal contaminant mixtures in the keystone genus, Daphnia. Here we examined D. magna metabolic responses to acute sub-lethal exposure of propranolol (PRO), carbamazepine (CBZ), and perfluorooctanesulfonic acid (PFOS) as well as in binary (PRO-CBZ, PRO-PFOS, CBZ-PFOS) and tertiary mixtures (CBZ-PRO-PFOS); all at 10% of the median lethal concentration of the population (LC50)...
June 19, 2018: Environmental Toxicology and Chemistry
Xiang Li, Yan Yuan, Fan Wang, Yong Huang, Qing-Tan Qiu, Yuan Yi, Zhen Bi
An efficient and stable combined denitrification-partial nitrification-Anammox process with a dual recycling system was used to remove nitrogen from mature landfill leachate. After 155 d of operation, the NO3 - as the PN-Anammox byproduct was almost treated with biodegradable organic carbon in raw wastewater in a pre-denitrification reactor by external recycling system. When raw landfill leachate with NH4 + -N concentration of 1900 mg/L was treated, an integrated reactor with airlift recycling was combined with the PN and Anammox reactions to efficiently remove NH4 + from the inflow...
June 9, 2018: Bioresource Technology
Shunwen Bai, Xinyue Zhao, Dawei Wang, Xuedong Zhang, Nanqi Ren
Environmental impacts of biological wastewater treatment technologies (BWTTs) can be evaluated by life cycle assessment (LCA). However, very few efforts have been made to expand the ranges of results acceptance and promote stakeholders to participate in the results analysis. To facilitate the evaluation reaching more wide and deep understanding, this study proposed to employ multiple weighting methods and the Conjoint Analysis. To investigate the feasibility, an illustrative case of a bioaugmented constructed wetland was carried out...
June 14, 2018: Bioresource Technology
Ming-Chi Hsieh, Sri Chandana Panchangam, Webber Wei-Po Lai, Angela Yu-Chen Lin
Free chlorine sunlight photolysis (sunlight/FC) markedly enhances the degradation rate of methadone, a synthetic opioid used medically, over that obtained using sunlight alone. The pseudo-first-order rate constants of methadone degradation under acidic conditions ([methadone] = 0.2 μM, [free chlorine] = 4 μM, and pH = 4) for sunlight/FC and sunlight photolysis are 7.0 ± 1.1 × 10-2  min-1 and 1.4 ± 0.2 × 10-2  min-1 , respectively. The improved methadone degradation can be attributed to the production of HO and reactive chlorine species (RCS) during sunlight/FC photolysis...
June 12, 2018: Chemosphere
Lara Barroso Brito, Luane Ferreira Garcia, Marcos Pereira Caetano, Germán Sanz Lobón, Mayk Teles de Oliveira, Rhaul de Oliveira, Ieda Maria Sapateiro Torres, Alfonso Yepez, Boniek Gontijo Vaz, Rafael Luque, Cesar Koppe Grisolia, Marize Campos Valadares, Eric de Souza Gil, Gisele Augusto Rodrigues de Oliveira
Amoxicillin (AMX) is one of the most commonly prescribed antibiotics around the world to treat and prevent several diseases in both human and veterinary medicine. Incomplete removal of AMX during wastewater treatment contributes to its presence in water bodies and drinking water. AMX is an emerging contaminant since its impact on the environment and human health remains uncertain. This contribution was aimed to evaluate the electrochemical oxidation (EO) of AMX using different anodes in tap water, NaCl or Na2 SO4 solutions and to evaluate the potential toxicity of remaining AMX and its by-products on zebrafish early-life stages...
June 16, 2018: Chemico-biological Interactions
Jung-Jeng Su, Jeng-Fang Huang, Yi-Lei Wang, Yu-Ya Hong
The objective of this study is trying to solve water pollution problems related to duck house wastewater by developing a novel duck house wastewater treatment technology. A pilot-scale sequencing batch reactor (SBR) system using different hydraulic retention times (HRTs) for treating duck house wastewater was developed and applied in this study. Experimental results showed that removal efficiency of chemical oxygen demand in untreated duck house wastewater was 98.4, 98.4, 87.8, and 72.5% for the different HRTs of 5, 3, 1, and 0...
June 15, 2018: Poultry Science
Sara Dawood, Tushar Kanti Sen, Chi Phan
A practical continuous adsorption study in a packed-bed column was conducted by using two separate layers of kaolin and pine cone based biochar packed bed adsorbents for the removal of methylene blue (MB) dye from its aqueous solution. A series of column experiments were performed to determine the breakthrough curves (BTCs) by varying bed height (3-7 cm), inlet flow rate (13- 17 ml/min) and initial dye concentration (50 -150 mg/L). The Thomas, Yoon-Nelson, Bed Depth Service Time (BDST) and Dose response (DR) dynamic models were applied to column experimental data under various operational conditions to predict the column breakthrough curves (BTC) using both nonlinear regression and linear regression and to determine various characteristic parameters such as percentage removal of dye, breakthrough time, used bed length, mass transfer zone (MTZ) and dye adsorption density q(total) that are useful for process design...
June 19, 2018: Environmental Technology
L Mozafari, R Amani, B Hamzeh, M H Haghighizadeh, M Bigvand
Introduction: Cardiovascular disease is the main cause of disability and morbidity in many countries. Considering the significance of education in correcting unhealthy eating habits and improving nutritional behaviors that prevents cardiovascular diseases, the current study has been carried out to investigate the impacts of Beliefs, Attitude, Subjective Norms, Enabling Factors (BASNEF)-based educational program on the employees' nutritional behaviors. Materials and Methods: This study was carried out on 120 randomly selected employees of Water and Wastewater Organization of Kermanshah...
January 2018: Journal of Family Medicine and Primary Care
Sreekar B Marpu, Erin N Benton
Chitosan (CS) is a natural polymer derived from chitin that has found its usage both in research and commercial applications due to its unique solubility and chemical and biological attributes. The biocompatibility and biodegradability of CS have helped researchers identify its utility in the delivery of therapeutic agents, tissue engineering, wound healing, and more. Industrial applications include cosmetic and personal care products, wastewater treatment, and corrosion protection, to name a few. Many researchers have published numerous reviews outlining the physical and chemical properties of CS, as well as its use for many of the above-mentioned applications...
June 17, 2018: International Journal of Molecular Sciences
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