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https://www.readbyqxmd.com/read/28822948/bacterial-and-archaeal-community-distribution-and-stabilization-of-anaerobic-sludge-in-a-strengthen-circulation-anaerobic-sca-reactor-for-municipal-wastewater-treatment
#1
Bo Yang, Hui Xu, Junfeng Wang, Xinshan Song, Yuhui Wang, Fang Li, Qing Tian, Chunyan Ma, Daoyuan Wang, Junhong Bai, Wolfgang Sand
In this study, a SCA reactor was employed for municipal wastewater treatment at a mesophilic temperature (30°C) under different hydraulic retention times (HRT) and upflow velocities (Vup) to investigate granule sludge stability and spatial microbial distribution. The stable COD removal efficiency readied at HRT of 15, 12, 9 and 6h, and Vup ranging from 0.6 to 5.9mh(-1). EPS fraction analysis of granule sludge shows that municipal wastewater was mainly attributed to the enrichment influence of polysaccharide and tightly bound-EPS...
August 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28822926/human-exposure-to-hydrogen-sulphide-concentrations-near-wastewater-treatment-plants
#2
Ana Flavia Locateli Godoi, Anderson Marlon Grasel, Gabriela Polezer, Andrew Brown, Sanja Potgieter-Vermaak, Débora Camargo Scremim, Carlos I Yamamoto, Ricardo Henrique Moreton Godoi
The hydrogen sulphide (H2S) levels from wastewater treatment plants (WWTPs) in Curitiba, Brazil have been quantified for the first time. H2S generated by anaerobic decomposition of organic matter in WWTPs is a cause for concern because it is an air pollutant, which can cause eye and respiratory irritation, headaches, and nausea. Considering the requirement for WWTPs in all communities, it is necessary to assess the concentrations and effects of gases such as H2S on populations living and/or working near WWTPs...
August 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822815/enrichment-of-highly-settleable-microalgal-consortia-in-mixed-cultures-for-effluent-polishing-and-low-cost-biomass-production
#3
Yuansheng Hu, Xiaodi Hao, Mark van Loosdrecht, Huiqin Chen
Microalgae cultivation is a promising technology for integrated effluent polishing and biofuel production, but poor separability of microalgal cells hinders its industrial application. This study intended to selectively enrich settleable microalgal consortia in mixed culture by applying "wash-out" pressure, which was realized by controlling settling time (ST) and volume exchange ratio (VER) in photo-SBRs. The results demonstrated that highly settleable microalgal consortia (settling efficiency>97%; SVI = 17-50 mL/g) could be enriched from indigenous algal cultures developed in WWTP's effluent...
August 15, 2017: Water Research
https://www.readbyqxmd.com/read/28822337/photocatalysis-of-estrone-in-water-and-wastewater-comparison-between-au-tio2-nanocomposite-and-tio2-and-degradation-by-products
#4
Kireesan Sornalingam, Andrew McDonagh, John L Zhou, Md Abu Hasan Johir, Mohammad Boshir Ahmed
Gold-modified TiO2 (Au-TiO2) photocatalysts were utilised for the degradation of estrone (E1), a major endocrine disrupting chemical in water and wastewater. Au-TiO2 catalysts were synthesised by a deposition-precipitation method with gold loadings of 0-8% (wt%). The Au-TiO2 nanocomposite exhibited superior activity compared to P25 TiO2 under UVA (λ=365nm), cool white (λ>420nm) and green (λ=523nm) light emitting diodes (LEDs), for treating 1mgl(-1) of E1. The 4wt% Au loading was found to produce the best photocatalytic activity with a rate constant of 2...
August 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28821098/physical-chemical-characteristics-and-potential-use-of-a-novel-alginate-zein-hydrogel-as-the-sorption-phase-for-polar-organic-compounds
#5
Natara D B Castilhos, Naiara M F M Sampaio, Bruno C da Silva, Izabel C Riegel-Vidotti, Marco T Grassi, Bruno J G Silva
A novel alginate based hydrogel was successfully prepared and tested for the solid phase microextraction of medium-to-high polarity compounds, when supported in a polypropylene (PP) fiber. Pure alginate when added onto the surface of the PP fiber, resulted in a significant improvement in the extraction efficiency of the analytes (except for β-estradiol). The alginate hydrogel was modified upon the incorporation of a small amount of zein, a corn protein. Interestingly, the alginate/zein-supported hydrogel was capable of successfully extracting compounds with low partition constant (Kow), such as 17-α-ethinyl estradiol, progesterone and estriol, since the initial water uptake decreased dramatically in this gel, therefore, leaving the alginate hydroxyl groups more available to interact with the polar compounds...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821044/removal-of-heavy-metal-ions-by-magnetic-chitosan-nanoparticles-prepared-continuously-via-high-gravity-reactive-precipitation-method
#6
Hong-Lei Fan, Shao-Feng Zhou, Wei-Zhou Jiao, Gui-Sheng Qi, You-Zhi Liu
This study aimed to provide a continuous method for the preparation of magnetic Fe3O4/Chitosan nanoparticles (Fe3O4/CS NPs) that can be applied to efficient removal of heavy metal ions from aqueous solution. Using a novel impinging stream-rotating packed bed, the continuous preparation of Fe3O4/CS NPs reached a theoretical production rate of 3.43kg/h. The as-prepared Fe3O4/CS NPs were quasi-spherical with average diameter of about 18nm and saturation magnetization of 33.5emu/g. Owing to the strong metal chelating ability of chitosan, the Fe3O4/CS NPs exhibited better adsorption capacity and faster adsorption rates for Pb(II) and Cd(II) than those of pure Fe3O4...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821002/modeling-the-fate-and-transport-of-17%C3%AE-estradiol-in-the-south-river-watershed-in-virginia
#7
Xiaomin Zhao, Wu-Seng Lung
Hormones excreted by livestock metabolisms often enter surface water through feces and urine and can potentially cause adverse impacts to aquatic biota. This study involved a modeling analysis of 17β-estradiol (E2), a prevalent estrogen, in the South River watershed located in Augusta County, Virginia from 2013 to 2015. Cattle manure, poultry litter, biosolids, septic systems, and wastewater treatment plants (WWTPs) were considered as sources of E2 in this study. The EPA's BASINS modeling framework was configured to track the fate and transport of E2...
August 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820993/changing-profiles-of-bound-water-content-and-distribution-in-the-activated-sludge-treatment-by-nacl-addition-and-ph-modification
#8
Dong-Qin He, Ying-Jie Zhang, Chuan-Shu He, Han-Qing Yu
Currently the dewatering of activated sludge from wastewater treatment plants is a problem not well solved. Extracellular polymeric substances (EPS), including loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS), are highly hydrated biopolymers and play important roles in sludge dewatering. In the present work, two types of treatments, i.e., salt addition and pH modification, were proposed to evaluate the effects of bound water content and its distribution on the dewatering performance of activated sludge...
August 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820992/bioavailability-of-dissolved-organic-nitrogen-don-in-wastewaters-from-animal-feedlots-and-storage-lagoons
#9
Jingyi Sun, Eakalak Khan, Senay Simsek, Jae-Bom Ohm, Halis Simsek
Dissolved organic nitrogen (DON) from animal wastes can contribute to pollution of surface waters. Bioavailable DON (ABDON) is a portion of DON utilized by algae with or without bacteria. This study determined DON and ABDON levels in animal wastewater collected from two different sources: an animal feedlot wastewater storage tank and a sheep wastewater storage lagoon. Inocula for the ABDON bioassays were comprised of individual species and several combinations involving two algae (Chlamydomonas reinhardtii and Chlorella vulgaris) and a mixed liquor suspended solids (MLSS) bacterial culture...
August 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820991/robust-evaluation-of-performance-monitoring-options-for-ozone-disinfection-in-water-recycling-using-bayesian-analysis
#10
Guido Carvajal, Amos Branch, Philipp Michel, Scott A Sisson, David J Roser, Jörg E Drewes, Stuart J Khan
Ozonation of wastewater has gained popularity because of its effectiveness in removing colour, UV absorbance, trace organic chemicals, and pathogens. Due to the rapid reaction of ozone with organic compounds, dissolved ozone is often not measurable and therefore, the common disinfection controlling parameter, concentration integrated over contact time (CT) cannot be obtained. In such cases, alternative parameters have been shown to be useful as surrogate measures for microbial removal including change in UV254 absorbance (ΔUVA), change in total fluorescence (ΔTF), or O3:TOC (or O3:DOC)...
August 1, 2017: Water Research
https://www.readbyqxmd.com/read/28820045/effect-of-air-flow-rate-and-c-n-ratio-on-biological-nitrogen-removal-through-canon-process-treating-reject-water
#11
Seyyed Alireza Mousavi, Mohammad Mehralian, Maryam Khashij, Shaliza Ibrahim
CANON process is a promising way for nitrogen removal in wastewaters with low organic carbon content like reject water. This study investigated the effect of important factor for optimization of CANON process through inhibition of nitrite-oxidizing bacteria (NOB). In acclimation period, complete ammonium removal and 43.3% total N removal were obtained at HRT of 12 h, temperature of 30 ± 0.5 °C and DO equal to. The effect of air flow rate (representative of DO), SRT and C/N were evaluated. Air flow rate (AFR) was most important factor for controlling the process, but the effect of SRT was negligible...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28820042/biodegradation-of-remazol-brilliant-blue-r-using-isolated-bacterial-culture-staphylococcus-sp-k2204
#12
Velayutham Karthikeyan, Madhava Anil Kumar, Pushparaj Mohanapriya, Thanarasu Amudha, Devaraj Thiruselvi, Periyasamy Karthik, Subramanian Sivanesan
Staphylococcus sp. K2204, a bacterial isolate, was employed in this work to decolorize Remazol Brilliant Blue R (RBBR), which belongs to the anthraquinone class of textile dye. Staphylococcus sp. K2204 biodegraded 100 mg/L RBBR at 37°C, under static condition with the help of extracellular laccase and peroxidases. The products of RBBR degradation were characterized using analytical tools including mass spectral technique. The phytotoxicity tests evaluated the toxicity of RBBR and the products of biodegradation...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28820023/use-of-oxalic-acid-as-inducer-in-photocatalytic-oxidation-of-cresol-red-in-aqueous-solution-under-natural-and-artificial-light
#13
N Seraghni, I Ghoul, I Lemmize, A Reguig, N Debbache, T Sehili
This work was carried out in the field of water treatment using advanced oxidation processes (AOPs), especially photolysis of carboxylic acid leads to the formation in situ of hydroxyl radical ((.)OH). Cresol red (CR) degradation induced by organic acids/UV system was investigated in aqueous solution. The preliminary study of CR-organic acid mixture in the dark and at room temperature allowed confirming the absence of interaction under our experimental conditions. However, up on irradiation at 365 nm the percentage of elimination of CR was 89% after 5 hours of irradiation...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28819697/mechanistic-understanding-of-crystal-violet-dye-sorption-by-woody-biochar-implications-for-wastewater-treatment
#14
Awanthi Wathukarage, Indika Herath, M C M Iqbal, Meththika Vithanage
Dye-based industries, particularly small and medium scale, discharge their effluents into waterways without treatment due to cost considerations. We investigated the use of biochars produced from the woody tree Gliricidia sepium at 300 °C (GBC300) and 500 °C (GBC500) in the laboratory and at 700 °C from a dendro bioenergy industry (GBC700), to evaluate their potential for sorption of crystal violet (CV) dye. Experiments were conducted to assess the effect of pH reaction time and CV loading on the adsorption process...
August 17, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28819273/enhanced-anaerobically-digested-swine-wastewater-treatment-by-the-composite-of-polyaluminum-chloride-pac-and-bacillus-megatherium-g106-derived-eps
#15
Junyuan Guo, Yang Huang, Cheng Chen, Yu Xiao, Jing Chen, Biyu Jian
A strain was isolated from biological sludge to produce EPS by using anaerobically digested swine wastewater (ADSW). Potential of the EPS in ADSW treatment were discussed. Results showed that the optimal fermentation medium for EPS production was determined as 4 g K2HPO4, 2 g KH2PO4, and 2 g sucrose dissolved in 1 L ADSW. After fermentation for 60 h, 2.98 g EPS with main backbone of polysaccharides can be extracted from 1 L of fermentation broth. The EPS showed good performances in ADSW treatment, after conditioned by this EPS, removal efficiencies of COD, ammonia, and TP reached 70...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818914/complete-genome-sequence-of-citrobacter-freundii-705sk3-an-oxa-48-encoding-wastewater-isolate
#16
Katrin Zurfluh, Roger Stephan, Jochen Klumpp, Magdalena Nüesch-Inderbinen, Jörg Hummerjohann, Claudia Bagutti, Roger Marti
We present the genome sequence of Citrobacter freundii 705SK3, a wastewater isolate harboring an IncL OXA-48-encoding plasmid. Assembly of the genome resulted in a 5,242,839-bp circular chromosome (GC content, 52%) and two closed plasmids of 296,175 bp and 63, 458 bp in size.
August 17, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28818913/draft-genome-sequence-of-klebsiella-pneumoniae-704sk6-an-oxa-48-and-ctx-m-15-encoding-wastewater-isolate
#17
Roger Marti, Roger Stephan, Jochen Klumpp, Magdalena Nüesch-Inderbinen, Jörg Hummerjohann, Claudia Bagutti, Katrin Zurfluh
The Swiss wastewater isolate Klebsiella pneumoniae 704SK6, encoding OXA-48 and CTX-M-15 β-lactamases, was fully sequenced. The assembly resulted in an open chromosome of 5,208,104 bp in size (G+C content, 57.6%) and four closed plasmid sequences of 209,651, 197,670, 65,998, and 63,605 bp in size.
August 17, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28818912/complete-genome-sequence-of-enterobacter-cloacae-704sk10-an-oxa-48-encoding-wastewater-isolate
#18
Roger Marti, Roger Stephan, Jochen Klumpp, Magdalena Nüesch-Inderbinen, Jörg Hummerjohann, Claudia Bagutti, Katrin Zurfluh
Here we present the complete genome sequence of Enterobacter cloacae 704SK10, a Swiss wastewater isolate encoding an OXA-48 carbapenemase. Assembly resulted in closed sequences of the 4,876,946-bp chromosome, a 111,184-bp IncF plasmid, and an OXA-48-encoding IncL plasmid (63,458 bp) nearly identical to the previously described plasmid pOXA-48.
August 17, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28818655/high-efficiency-removal-of-methylene-blue-using-sds-surface-modified-znfe2o4-nanoparticles
#19
Ping Zhang, Irene Lo, David O'Connor, Simo Pehkonen, Hefa Cheng, Deyi Hou
Recent studies have shown that hazardous organic dye substances can be removed from aqueous solutions by spinel ferrite nanomaterials. We found that Sodium Dodecyl Sulfonate (SDS) surface-modified mesoporous ZnFe2O4 nanoparticles (10-50nm) have a remarkably high maximum adsorptive capacity (∼699.30mg/g) for aqueous Methylene Blue (MB) removal at T of 288K and pH of 12. Unmodified ZnFe2O4 nanoparticles suffer from particle agglomeration, which reduces surface area, thus reducing their adsorptive capacity. Here it is shown that when modified with SDS, the specific surface area increased by ∼34%...
August 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28818594/ultraviolet-and-solar-photocatalytic-ozonation-of-municipal-wastewater-catalyst-reuse-energy-requirements-and-toxicity-assessment
#20
Achisa C Mecha, Maurice S Onyango, Aoyi Ochieng, Maggy N B Momba
The present study evaluated the treatment of municipal wastewater containing phenol using solar and ultraviolet (UV) light photocatalytic ozonation processes to explore comparative performance. Important aspects such as catalyst reuse, mineralization of pollutants, energy requirements, and toxicity of treated wastewater which are crucial for practical implementation of the processes were explored. The activity of the photocatalysts did not change significantly even after three consecutive uses despite approximately 2% of the initial quantity of catalyst being lost in each run...
August 13, 2017: Chemosphere
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