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Dileep Kumar Yeruva, J Shanthi Sravan, Sai Kishore Butti, J Annie Modestra, S Venkata Mohan
In the present study, three bio-electrochemical treatment systems (BET) were designed with variations in cathode electrode placement [air exposed (BET1), partially submerged (BET2) and fully submerged (BET3)] to evaluate azo-dye based wastewater treatment at three dye loading concentrations (50, 250 and 500 mg L-1 ). Highest dye decolorization (94.5 ± 0.4%) and COD removal (62.2 ± 0.8%) efficiencies were observed in BET3 (fully submerged electrodes) followed by BET1 and BET2, while bioelectrogenic activity was highest in BET1 followed by BET2 and BET3...
February 7, 2018: Bioresource Technology
Nuno F F Moreira, Carlos Narciso-da-Rocha, M Inmaculada Polo-López, Luisa M Pastrana-Martínez, Joaquim L Faria, Célia M Manaia, Pilar Fernández-Ibáñez, Olga C Nunes, Adrián M T Silva
Solar-driven advanced oxidation processes were studied in a pilot-scale photoreactor, as tertiary treatments of effluents from an urban wastewater treatment plant. Solar-H2 O2 , heterogeneous photocatalysis (with and/or without the addition of H2 O2 and employing three different photocatalysts) and the photo-Fenton process were investigated. Chemical (sulfamethoxazole, carbamazepine, and diclofenac) and biological contaminants (faecal contamination indicators, their antibiotic resistant counterparts, 16S rRNA and antibiotic resistance genes), as well as the whole bacterial community, were characterized...
February 3, 2018: Water Research
Alice Ferreira, Paula Marques, Belina Ribeiro, Paula Assemany, Henrique Vieira de Mendonça, Ana Barata, Ana Cristina Oliveira, Alberto Reis, Helena M Pinheiro, Luisa Gouveia
The ability of microalgae to grow in nutrient-rich environments and to accumulate nutrients from wastewaters (WW) makes them attractive for the sustainable and low-cost treatment of WW. The valuable biomass produced can be further used for the generation of bioenergy, animal feed, fertilizers, and biopolymers, among others. In this study, Scenedesmus obliquus was able to remove nutrients from different wastewaters (poultry, swine and cattle breeding, brewery and dairy industries, and urban) with removal ranges of 95-100% for nitrogen, 63-99% for phosphorus and 48-70% for chemical oxygen demand...
February 20, 2018: Environmental Research
Takahiro Fujioka, Haruka Takeuchi, Hiroaki Tanaka, Hitoshi Kodamatani
The security of recycled water quality in potable reuse can be enhanced by improving the credibility of reverse osmosis (RO) treatment for the removal of trace organic chemicals (TOrCs). This study evaluated the potential of online monitoring of N-nitrosodimethylamine (NDMA) before and after RO treatment as a surrogate indicator for TOrC removal by RO. This pilot-scale study monitored NDMA concentrations in RO feedwater (ultrafiltration-treated wastewater) and RO permeate every 22 min using novel online NDMA analyzers-high-performance liquid chromatography followed by photochemical reaction and chemiluminescence detection...
February 17, 2018: Chemosphere
A Castellano-Hinojosa, P Maza-Márquez, Y Melero-Rubio, J González-López, B Rodelas
Ammonia-oxidizing bacteria (AOB), ammonia oxidizing archaea (AOA) and N2 O-reducing denitrifiers were measured by quantitative real-time PCR (qPCR) in activated sludge samples from four full-scale wastewater treatment plants (WWTPs) in South Spain, and their abundances were linked to the generation of N2 O in the samples using multivariate analysis (Non-metric multidimensional scaling, MDS, and BIO-ENV). The average abundances of AOA remained in similar orders of magnitude in all WWTPs (106 copies amoA/L activated sludge mixed liquor), while significant differences were detected for AOB (105 -109 copies amoA/L) and N2 O-reducers (107 -1010 copies nosZ/L)...
February 19, 2018: Chemosphere
Domenica Mirauda, Marco Ostoich
The present study develops an integrated methodology combining the results of the water-quality classification, according to the Water Framework Directive 2000/60/EC-WFD, with those of a mathematical integrity model. It is able to analyse the potential anthropogenic impacts on the receiving water body and to help municipal decision-makers when selecting short/medium/long-term strategic mitigation actions to be performed in a territory. Among the most important causes of water-quality degradation in a river, the focus is placed on pollutants from urban wastewater...
February 23, 2018: International Journal of Environmental Research and Public Health
Justyna Rogowska, Ewa Olkowska, Wojciech Ratajczyk, Lidia Wolska
Since the 1980 s, gadolinium based contrast agents (GBCA) are routinely used in magnetic resonance imaging (MRI) as stable chelates of the Gd3+ ion, without toxic effects. Generally, GBCAs are considered as some of the safest contrast agents. However, it has been observed that they can accumulate in patients tissue, bone and probably in brain (causing nephrogenic systemic fibrosis in patients with kidney failure, insufficiency and disturbance of calcium homeostasis in the organism). The GBCAs are predominantly removed renally without metabolization...
February 23, 2018: Environmental Toxicology and Chemistry
Xing Wang, Subin Jiang, Xuejian Huo, Rui Xia, Elisée Muhire, Meizhen Gao
In this article, mechanical grinding - an effortless and super effective synthetic strategy is used to successfully synthesis TiO2QDs/g-C3N4 heterostructure. The XPS results together with TEM reveal the formation of TiO2QDs/g-C3N4 heterostructure with strong interfacial interaction. Because of the advantage of this characteristic, the prepared heterostructures exhibit excellent property for photocatalytic wastewater treatment. Noticeably, the optimum photocatalytic activity of TiO2QDs/g-C3N4 heterostructures is nearly 3...
February 23, 2018: Nanotechnology
Na Gao, Ming Xia, Jingcheng Dai, Dianzhen Yu, Weixin An, Shuyang Li, Shuangyuan Liu, Penghui He, Liping Zhang, Zhenbin Wu, Xuezhi Bi, Shouwen Chen, Daniel H Haft, Dongru Qiu
Bacterial floc formation plays a central role in the activated sludge (AS) process, which has been widely utilized for sewage and wastewater treatment. The formation of AS flocs has long been known to require exopolysaccharide biosynthesis. This study demonstrates an additional requirement for a PEP-CTERM protein in Zoogloea resiniphila, a dominant AS bacterium harboring a large exopolysaccharide biosynthesis gene cluster. Two members of a wide-spread family of high copy number-per-genome PEP-CTERM genes, transcriptionally regulated by the RpoN sigma factor and accessory PrsK-PrsR two-component system, and at least one of these, pepA, must be expressed for Zoogloea to build the floc structures that allow gravitational sludge settling and recycling...
February 23, 2018: Environmental Microbiology
Nan Zhang, Guang Xian, Xuemei Li, Panyue Zhang, Guangming Zhang, Jia Zhu
The characteristics and performances of catalyst are the key in catalytic ultrasonic treatment of wastewater, and iron based catalysts are known for low cost, high accessibility and safety. This paper reviewed the current research status of iron-based catalysts in water treatment assisted by ultrasound. Zero valent iron, Fe3 O4 and iron composited with other metals were analyzed, their behaviors in catalytic sonochemistry were summarized, and the potential catalytic mechanisms were discussed in details. Finally, the future development in this field was proposed...
2018: Frontiers in Chemistry
P Vo Hoang Nhat, H H Ngo, W S Guo, S W Chang, D D Nguyen, P D Nguyen, X T Bui, X B Zhang, J B Guo
Algae is a well-known organism that its characteristic is prominent for biofuel production and wastewater remediation. This critical review aims to present the applicability of algae with in-depth discussion regarding three key aspects: (i) characterization of algae for its applications; (ii) the technical approaches and their strengths and drawbacks; and (iii) future perspectives of algae-based technologies. The process optimization and combinations with other chemical and biological processes have generated efficiency, in which bio-oil yield is up to 41...
February 8, 2018: Bioresource Technology
Yang Xiao, Yunkai Li, Zigong Ning, Pengxiang Li, Peiling Yang, Chengcheng Liu, Zhongwei Liu, Feipeng Xu, Paul Dylan Hynds
Wastewater reclamation now represents an effective measure for sustainable water resource management in arid regions, however wastewater components (organic micropollutants) may potentially impact local ecological and/or human health. Previous studies have shown that sodium bentonite/natural clay (BC) mixes may be used to effectively reduce riverbed infiltration in regions characterized by excessively high hydraulic conductivity. Accordingly, the current study sought to investigate the contaminant removal efficiency (Re) of several BC mass ratios in simulated dry riverbeds...
January 31, 2018: Journal of Contaminant Hydrology
Suntae Lee, Shota Tasaki, Akihiko Hata, Naoyuki Yamashita, Hiroaki Tanaka
Evaluating the reduction of virus load in water reclamation plants is important to ensuring the hygienic safety of the reclaimed water. A virus-spiking test is usually used to estimate virus reduction but is not practicable at large-scale plants. Thus, we evaluated virus reduction by ultrafiltration (UF) plus ultraviolet (UV) irradiation at a large-scale reclamation plant (1000 m3 /d) by quantifying indigenous F-specific RNA bacteriophages (FRNAPHs). To detect the infectious FRNAPH, we used both plaque assay and integrated culture-reverse-transcription polymerase chain reaction combined with the most probable number assay, which can detect infectious FRNAPH genotypes...
February 23, 2018: Environmental Technology
Xiaoying Liu, Ao Zeng, Yatao Wang, Peiju Liu, Yuan Chen, Yinghe Jiang
Low temperature is an important inhibitor for nitrogen removal in the wastewater treatment plants (WWTPs). To ensure low effluent total nitrogen (TN≤15 mg·L-1 ) and NH3 -N(≤5 mg·L-1 ) at low temperatures (8.8-14.7 °C), a pilot-scale A2 /O system with a low return activated sludge (RAS, 200%) was employed to seek the optimal operation strategy. In the 90 days' experiment, the tests were separated into 3 stages (14.2, 11.0, and 9.1 °C), and the nitrogen removal efficiencies of 49 samples were analysed...
February 23, 2018: Environmental Technology
Maxime Bisseux, Jonathan Colombet, Audrey Mirand, Anne-Marie Roque-Afonso, Florence Abravanel, Jacques Izopet, Christine Archimbaud, Hélène Peigue-Lafeuille, Didier Debroas, Jean-Luc Bailly, Cécile Henquell
BackgroundHuman enteric viruses are resistant in the environment and transmitted via the faecal-oral route. Viral shedding in wastewater gives the opportunity to track emerging pathogens and study the epidemiology of enteric infectious diseases in the community. Aim: The aim of this study was to monitor the circulation of enteric viruses in the population of the Clermont-Ferrand area (France) by analysis of urban wastewaters. Methods: Raw and treated wastewaters were collected between October 2014 and October 2015 and concentrated by a two-step protocol using tangential flow ultrafiltration and polyethylene glycol precipitation...
February 2018: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
James P Meador, Andrew Yeh, Evan P Gallagher
Several metabolic parameters were assessed in juvenile Chinook salmon (Oncorhynchus tshawytscha) and staghorn sculpin (Leptocottus armatus) residing in two estuaries receiving wastewater treatment effluent and one reference estuary. We also conducted a laboratory study with fish dosed for 32 days with 16 of the most common contaminants of emerging concern (CECs) detected in feral fish. Several blood chemistry parameters and other indicators of health were measured in fish from the field and laboratory study that were used to assess potential metabolic disruption...
February 19, 2018: Environmental Pollution
Yanjie Wang, Lin Li, Yunping Han, Junxin Liu, Kaixiong Yang
Samples from two oxidation ditch process municipal wastewater treatment plants (MWTPs) (HJK and GXQ) in two regions of China were analysed for bacteria, particles, total organic carbon, and water-soluble ions in bioaerosols. Diversity and potential pathogen populations were evaluated by high-throughput sequencing. Bioaerosol sources, factors affecting intestinal bacterial survival, and the relationship between bioaerosols and water were analysed by Source tracker and partial least squares-discriminant, principal component, and canonical correspondence analyses...
February 19, 2018: Ecotoxicology and Environmental Safety
Chong Cao, Juan Huang, Chunni Yan, Jialiang Liu, Qian Hu, Wenzhu Guan
The increasing utilization of silver nanoparticles (Ag NPs) in industry and commerce inevitably raises its release into wastewater. In this work, effects of Ag NPs on system performance and microbial community along the way of a vertical flow constructed wetland (VFCW) were investigated, along with the removal and fate of Ag NPs within the system. Results showed that the performance of control wetland kept stable during the experimental period, and the top substrate layer (soil layer) of wetland could remove most of pollutants in the influent...
February 7, 2018: Chemosphere
Yancheng Li, Yingmu Wang, Ziyuan Lin, Jiale Wang, Qiang He, Jian Zhou
Pulping wastewater still contains massive refractory organics after biotreatment, with high colority, low biodegradability, and lasting biotoxicity. To eliminate refractory organics in pulping wastewater, a methanotrophic co-metabolic system in a gas cycle Sequencing Batch Biofilm Reactor (gcSBBR) seeded by soil at a ventilation opening of coal mine was quickly built on the 92nd day. The removal rate of COD, colority and TOC was 53.28%, 50.59% and 51.60%, respectively. Analysis of 3D-EEM indicated that glycolated protein-like, melanoidin-like or lignocellulose-like, and humic acid-like decreased by 7...
February 13, 2018: Bioresource Technology
Wei Sun, Jie Gu, Xiaojuan Wang, Xun Qian, Xiaxia Tuo
Biochar has positive effects on nitrogen conservation during anaerobic digestion, but its impacts on antibiotic resistance genes (ARGs) are unclear. Therefore, the effect of biochar (0, 5, 20, and 50 g/L) on the environmental risk of ARGs during cattle manure wastewater anaerobic digestion were investigated. The results showed that 5 g/L biochar reduced the relative abundances (RAs) of 5/13 ARGs while 20 g/L biochar significantly reduced the total RAs of ARGs in the digestion products, where the RA of ISCR1 was 0...
February 13, 2018: Bioresource Technology
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