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https://www.readbyqxmd.com/read/28719845/the-effects-of-ibuprofen-on-activated-sludge-shift-in-bacterial-community-structure-and-resistance-to-ciprofloxacin
#1
Madars Davids, Dita Gudra, Ilze Radovica-Spalvina, Davids Fridmanis, Vadims Bartkevics, Olga Muter
Ibuprofen (IBP) is ranked at the 4th place among 57 pharmaceutical compounds according to the number of citations in prioritization documents. The response of microbial community of activated sludge to IBP was studied at the concentrations of 50-5000mg/L. Batch incubation was performed in an OxiTop® device for 21days. The reduction of biological oxygen demand depended on the IBP concentration and varied in the range from 321 to 107mg O2/L. Massive DNA sequencing analysis of the activated sludge revealed that Proteobacteria became more dominant when grown in the presence of IBP...
June 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28719817/aged-refuse-enhances-anaerobic-digestion-of-waste-activated-sludge
#2
Jianwei Zhao, Lin Gui, Qilin Wang, Yiwen Liu, Dongbo Wang, Bing-Jie Ni, Xiaoming Li, Rui Xu, Guangming Zeng, Qi Yang
In this work, a low-cost alternative approach (i.e., adding aged refuse (AR) into waste activated sludge) to significantly enhance anaerobic digestion of sludge was reported. Experimental results showed that with the addition dosage of AR increasing from 0 to 400 mg/g dry sludge soluble chemical oxygen demand (COD) increased from 1150 to 5240 mg/L at the digestion time of 5 d, while the maximal production of volatile fatty acids (VFA) increased from 82.6 to 183.9 mg COD/g volatile suspended solids. Although further increase of AR addition decreased the concentrations of both soluble COD and VFA, their contents in these systems with AR addition at any concentration investigated were still higher than those in the blank, which resulted in higher methane yields in these systems...
July 14, 2017: Water Research
https://www.readbyqxmd.com/read/28719269/the-influence-of-household-and-community-level-sanitation-and-fecal-sludge-management-on-urban-fecal-contamination-in-households-and-drains-and-enteric-infection-in-children
#3
David Berendes, Amy Kirby, Julie A Clennon, Suraja Raj, Habib Yakubu, Juan Leon, Katharine Robb, Arun Kartikeyan, Priya Hemavathy, Annai Gunasekaran, Ben Ghale, J Senthil Kumar, Venkata Raghava Mohan, Gagandeep Kang, Christine Moe
AbstractUrban sanitation necessitates management of fecal sludge inside and outside the household. This study examined associations between household sanitation, fecal contamination, and enteric infection in two low-income neighborhoods in Vellore, India. Surveys and spatial analysis assessed the presence and clustering of toilets and fecal sludge management (FSM) practices in 200 households. Fecal contamination was measured in environmental samples from 50 households and household drains. Enteric infection was assessed from stool specimens from children under 5 years of age in these households...
June 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28718056/aeration-control-strategies-to-stimulate-simultaneous-nitrification-denitrification-via-nitrite-during-the-formation-of-aerobic-granular-sludge
#4
Thomas Dobbeleers, Jolien D'aes, Solange Miele, Michel Caluwé, Veerle Akkermans, Dominique Daens, Luc Geuens, Jan Dries
In this study, a sequencing batch reactor (SBR), treating synthetic wastewater (COD/N = 5), was operated in two stages. During stage I, an aeration control strategy based on oxygen uptake rate (OUR) was applied, to accomplish nitrogen removal via nitrite >80%. In stage II, the development of aerobic granular sludge (AGS) was examined while two aeration control strategies (OUR and pH slope) maintained the nitrite pathway and optimized the simultaneous nitrification-denitrification (SND) performance. Stimulation of slow-growing organisms, (denitrifying) polyphosphate-accumulating organisms (D)PAO and (denitrifying) glycogen-accumulating organisms (D)GAO leads to full granulation (at day 200, SVI10 = 47...
July 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28718023/two-year-survey-of-specific-hospital-wastewater-treatment-and-its-impact-on-pharmaceutical-discharges
#5
Laure Wiest, Teofana Chonova, Alexandre Bergé, Robert Baudot, Frédérique Bessueille-Barbier, Linda Ayouni-Derouiche, Emmanuelle Vulliet
It is well known that pharmaceuticals are not completely removed by conventional activated sludge wastewater treatment plants. Hospital effluents are of major concern, as they present high concentrations of pharmaceutically active compounds. Despite this, these specific effluents are usually co-treated with domestic wastewaters. Separate treatment has been recommended. However, there is a lack of information concerning the efficiency of separate hospital wastewater treatment by activated sludge, especially on the removal of pharmaceuticals...
July 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28716294/life-cycle-assessment-of-the-use-of-alternative-fuels-in-cement-kilns-a-case-study
#6
Martha Georgiopoulou, Gerasimos Lyberatos
The benefits of using alternative fuels (AFs) in the cement industry include reduction of the use of non-renewable fossil fuels and lower emissions of greenhouse gases, since fossil fuels are replaced with materials that would otherwise be degraded or incinerated with corresponding emissions and final residues. Furthermore, the use of alternative fuels maximizes the recovery of energy. Seven different scenaria were developed for the production of 1 ton of clinker in a rotary cement kiln. Each of these scenaria includes the use of alternative fuels such as RDF (Refuse derived fuel), TDF (Tire derived fuel) and BS (Biological sludge) or a mixture of them, in partial replacement of conventional fuels such as coal and pet coke...
July 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28716030/modeling-de-novo-granulation-of-anaerobic-sludge
#7
Anna Doloman, Honey Varghese, Charles D Miller, Nicholas S Flann
BACKGROUND: A unique combination of mechanical, physiochemical and biological forces influences granulation during processes of anaerobic digestion. Understanding this process requires a systems biology approach due to the need to consider not just single-cell metabolic processes, but also the multicellular organization and development of the granule. RESULTS: In this computational experiment, we address the role that physiochemical and biological processes play in granulation and provide a literature-validated working model of anaerobic granule de novo formation...
July 17, 2017: BMC Systems Biology
https://www.readbyqxmd.com/read/28715778/denitrifying-sulfur-conversion-associated-ebpr-the-effect-of-ph-on-anaerobic-metabolism-and-performance
#8
Gang Guo, Di Wu, Tianwei Hao, Hamish Robert Mackey, Li Wei, Guanghao Chen
The performance of the denitrifying sulfur conversion-associated enhanced biological phosphorus removal (DS-EBPR) process tends to be unstable and requires further study and development. This in turn requires extensive study of the anaerobic metabolism in terms of its stoichiometry and kinetics. This study evaluates the corresponding responses of DS-EBPR to pH, as it significantly influences both stoichiometry and biochemical kinetics. The impacts of five representative pH values ranging between 6.5 and 8.5 on the anaerobic metabolism were investigated, followed by identification of the optimal pH for performance optimization...
July 12, 2017: Water Research
https://www.readbyqxmd.com/read/28715742/development-of-high-performance-supercapacitor-electrode-derived-from-sugar-industry-spent-wash-waste
#9
Ashesh Mahto, Rajeev Gupta, Krishna Kanta Ghara, Divesh N Srivastava, Pratyush Maiti, Kalpana D, Paul Zavala-Revira, R Meena, S K Nataraj
This study aims at developing supercapacitor materials from sugar and distillery industry wastes, thereby mediating waste disposal problem through reuse. In a two-step process, biomethanated spent wash (BMSW) was acid treated to produce solid waste sludge and waste water with significantly reduced total organic carbon (TOC) and biological oxygen demand (BOD) content. Further, waste sludge was directly calcined in presence of activating agent ZnCl2 in inert atmosphere resulting in high surface area (730-900m(2)g(-1)) carbon of unique hexagonal morphology...
June 23, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28715738/inhibition-of-ammonia-on-anaerobic-digestion-of-synthetic-coal-gasification-wastewater-and-recovery-using-struvite-precipitation
#10
Wei Wang, Xuesong Ren, Kai Yang, Zhenhu Hu, Shoujun Yuan
Coal gasification wastewater (CGW) contains very high concentrations of phenols and ammonia. However, the potential impact of ammonia on the anaerobic digestion of phenols remained unclear. Firstly, the methanogens and phenols degraders had a good tolerance up to 1gL(-1) of total ammonia nitrogen (TAN), but the substrate utilization rate for phenol, and specific methanogenic activity of sludge were decreased by 89% and 67% at 5g TAN L(-1), and 94% and 100% at 10g TAN L(-1), respectively. Secondly, the optimum struvite crystallization conditions (pH=8...
July 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28712779/fabrication-of-engineered-biochar-from-paper-mill-sludge-and-its-application-into-removal-of-arsenic-and-cadmium-in-acidic-water
#11
Kwangsuk Yoon, Dong-Wan Cho, Daniel C W Tsang, Nanthi Bolan, Jörg Rinklebe, Hocheol Song
An engineered biochar was fabricated via paper mill sludge pyrolysis under CO2 atmosphere, and its adsorption capability for As(V) and Cd(II) in aqueous solution was evaluated in a batch mode. The characterization results revealed that the biochar had the structure of complex aggregates containing solid minerals (FeO, Fe3O4 and CaCO3) and graphitic carbon. Adsorption studies were carried out covering various parameters including pH effect, contact time, initial concentrations, competitive ions, and desorption...
July 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28712337/overall-effect-of-carbon-production-and-nutrient-release-in-sludge-holding-tank-on-mainstream-biological-nutrient-removal-efficiency
#12
Pouria Jabari, Qiuyan Yuan, Jan A Oleszkiewicz
The objective of this study was to assess the potential of hydrolysis/fermentation of activated sludge in sludge holding tank (SHT) to produce additional carbon for biological nutrient removal (BNR) process. The study was conducted in anaerobic batch tests using the BNR sludge (from a full-scale Westside process) and the mixture of BNR sludge with conventional non-BNR activated sludge (to have higher biodegradable particulate COD (bpCOD) in sludge). At different times during the batch tests the nutrient release, filtered COD (FCOD) production and polyphosphate (poly-P) and aerobic phosphorous uptake of sludge were measured...
July 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28712332/comparison-of-commercial-baker-s-yeast-versus-bacteria-based-membrane-bioreactors-for-landfill-leachate-treatment
#13
M C S Amaral, G C B Brito, B G Reis, L C Lange, W G Moravia
This paper compares the performance of the membrane bioreactor (MBR) inoculated with commercial baker's yeast (Saccharomyces cerevisiae) (MBRy) versus one inoculated with bacterial sludge (MBRb) for treatment of landfill leachate (LFL). The MBRb and MBRy were operated with a hydraulic retention time (HRT) of 48 h, solids retention time (SRT) of 60 d, and specific air demand based on membrane area (SADm) of 0.6 m(3) h(-1) m(-2). The MBRy was more efficient in removing COD (68 ± 12%), color (79 ± 8%), ammoniacal nitrogen (58 ± 18%), and phosphorus (62 ± 19%) compared to MBRb, which showed removal efficiencies of 44 ± 18%, 46 ± 20%, 45 ± 17%, and 29 ± 15% for COD, color, ammoniacal nitrogen, and phosphorus...
July 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28711801/effect-of-different-nitrogen-fertilizer-treatments-on-the-conversion-of-miscanthus%C3%A3-giganteus-to-ethanol
#14
Bogdan Dubis, Katarzyna Bułkowska, Małgorzata Lewandowska, Władysław Szempliński, Krzysztof Józef Jankowski, Jakub Idźkowski, Natalia Kordala, Karolina Szymańska
Miscanthus×giganteus is a perennial rhizomatous grass which is used as a biofuel crop. Due to its high yields, low production costs, resistance to low temperatures, low soil requirements and, above all, high cellulose content, miscanthus can be a useful resource for ethanol production. The aim of this study was to determine the effect of two fertilization regimes (sewage sludge/mineral NPK) during miscanthus cultivation on the chemical composition of biomass, the content of major lignocellulosic factions and the effectiveness of miscanthus conversion to bioethanol...
July 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28711775/natural-and-artificial-radionuclides-in-sludge-sand-granular-activated-carbon-and-reverse-osmosis-brine-from-a-metropolitan-drinking-water-treatment-plant
#15
Dani Mulas, Antonia Camacho, Isabel Serrano, Sergio Montes, Ricard Devesa, Maria Amor Duch
No abstract text is available yet for this article.
July 13, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28710982/occurrence-fate-and-mass-balance-of-different-classes-of-pharmaceuticals-and-personal-care-products-in-an-anaerobic-anoxic-oxic-wastewater-treatment-plant-in-xiamen-china
#16
Muhammad Ashfaq, Yan Li, Yuwen Wang, Wenjie Chen, Han Wang, Xiangqiang Chen, Wei Wu, Zhenyi Huang, Chang-Ping Yu, Qian Sun
In this study, the occurrence and fate of 49 pharmaceuticals and personal care products (PPCPs) were investigated in an anaerobic-anoxic-oxic (A2/O) wastewater treatment plant (WWTP) for seven consecutive days using 24-h composite sampling technique. Special emphasis was placed to understand the distribution of PPCPs in dissolved and adsorbed phase, and to evaluate PPCP fate in different treatment units. Among the 49 PPCPs, 40 PPCPs in influent, 36 in effluent, 29 in sludge and 23 in suspended solids were detected at least once during sampling...
July 7, 2017: Water Research
https://www.readbyqxmd.com/read/28710731/effects-of-salinity-c-s-ratio-s-n-ratio-on-the-besi-process-and-treatment-of-nanofiltration-concentrate
#17
Chao Wei, Li Wei, Chunying Li, Dong Wei, Yunfa Zhao
A laboratory-scale biodegradation and electron transfer based on the sulfur metabolism in the integrated (BESI(®)) process was used to treat a saline petrochemical nanofiltration concentrate (NFC). The integrated process consisted of activated sludge sulfate reduction (SR), and sulfide oxidation (SO) reactors, and a biofilm nitrification reactor. During the process, the total removal efficiencies of chemical oxygen demand (COD), ammonia nitrogen, and total nitrogen (TN) were 76.2, 83.8, and 73.1%, respectively...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28710626/stigmasterol-removal-by-an-aerobic-treatment-system
#18
Soledad Chamorro, Claudia Xavier, Víctor Hernández, José Becerra, Gladys Vidal
Stigmasterol is a phytosterol contained in Kraft mill effluent that is able to increase over 100% after aerobic biological treatment. This compound can act as an endocrine disrupter as its structure is similar to that of cholesterol. Furthermore, stigmasterol contained in Kraft mill effluent shows high toxicity (25-fold that of β-sitosterol) to aquatic organisms such as Daphnia magna (24-48 h). However, the operation of the aerobic treatment and biomass adaptation could be affecting their removal. The performances of activated sludge (AS), aerated lagoon (AL), and moving bed biofilm reactors (MBBR) are compared for removing stigmasterol contained in Kraft mill effluent...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28709105/fundamental-mechanisms-and-reactions-in-non-catalytic-subcritical-hydrothermal-processes-a-review
#19
REVIEW
Azadeh Yousefifar, Saeid Baroutian, Mohammed M Farid, Daniel J Gapes, Brent R Young
The management and disposal of solid waste is of increasing concern across the globe. Hydrothermal processing of sludge has been suggested as a promising solution to deal with the considerable amounts of sludge produced worldwide. Such a process not only degrades organic compounds and reduces waste volume, but also provides an opportunity to recover valuable substances. Hydrothermal processing comprises two main sub-processes: wet oxidation (WO) and thermal hydrolysis (TH), in which the formation of various free radicals results in the production of different intermediates...
June 30, 2017: Water Research
https://www.readbyqxmd.com/read/28709102/adsorption-and-degradation-of-14-c-bisphenol-a-in-a-soil-trench
#20
Jian Shen, Xin-Ze Wang, Zhen Zhang, Yan-Ming Sui, Hai-Lu Wu, Ji-Meng Feng, Xin-Nan Tong, Zhen-Yu Zhang
Bisphenol A (BPA) has caused widespread concern among scholars as a result of its estrogenic toxicity. It exists mainly in natural waters, sediments, and soil, as well as sewage and wastewater sludge. Considering that BPA is a common environmental pollutant that is removed along with chemical oxygen demand (COD), nitrogen, and phosphorus in drainage treatment systems, it is important to research the fate of BPA in sewage treatment systems. In this research, laboratory batch experiments on soil degradation and adsorption were conducted with (14)C-BPA, aiming to discuss the transport and degradation characteristics of BPA in both simulated facilities and a soil trench...
July 11, 2017: Science of the Total Environment
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