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Hamse Kjerstadius, Jo de Vrieze, Jes la Cour Jansen, Åsa Davidsson
High-volume, low-strength industrial wastewaters constitute a large potential for biogas production, which could be realized by membrane bioreactors operating at the ambient temperature of the wastewater. However, the start-up of low-temperature anaerobic processes using unadapted inoculum can be sensitive to overloading, which results in acidification. This study assessed if a novel acidification limit test can be used to identify stable organic loading rates as well as process over-loading. The test is based on easy-to-apply batch experiments for determination of the hydrolysis rate constant and the specific methanogenic activity of the acetotrophic and hydrogenotrophic pathways...
October 14, 2016: Water Research
Else Marie Fykse, Tone Aarskaug, Elisabeth H Madslien, Marius Dybwad
High-throughput amplicon sequencing of six biomass samples from a full-scale anaerobic reactor at a Norwegian wood and pulp factory using Biothane Biobed Expanded Granular Sludge Bed (EGSB) technology during start-up and first year of operation was performed. A total of 106,166 16S rRNA gene sequences (V3-V5 region) were obtained. The number of operational taxonomic units (OTUs) ranged from 595 to 2472, and a total of 38 different phyla and 143 families were observed. The predominant phyla were Bacteroidetes, Chloroflexi, Firmicutes, Proteobacteria, and Spirochaetes...
September 30, 2016: Bioresource Technology
Martha M Yeshanew, Luigi Frunzo, Vincenzo Luongo, Francesco Pirozzi, Piet N L Lens, Giovanni Esposito
The present work studied the start-up process of a mesophilic (37 ± 2 °C) anaerobic fluidized bed reactor (AFBR) operated at a hydraulic retention time (HRT) of 20 days using synthetic carbohydrate rich wastewater. Anox Kaldness-K1 carriers were used as biofilm carrier material. The reactor performance and biofilm formation were evaluated during the process. The start-up process at lower liquid recirculation flow rate enhanced the biofilm formation and reactor performance. The organic substrate composition had a major impact on early colonization of methanogenic archaea onto the surface of the Kaldness carriers during the start-up process...
October 13, 2016: Journal of Environmental Management
A A L Traversari, C Bottenheft, S P M van Heumen, C A Goedhart, M C Vos
BACKGROUND: Switching off air handling systems in operating theaters during periods of prolonged inactivity (eg, nights, weekends) can produce a substantial reduction of energy expenditure. However, little evidence is available regarding the effect of switching off the air handling system during periods of prolonged inactivity on the air quality in operating theaters during operational periods. The aim of this study is to determine the amount of time needed after restarting the ventilation system to return to a stable situation, with air quality at least equal to the situation before switching off the system...
October 11, 2016: American Journal of Infection Control
R Pabst, P B Linke, N B A Neudeck, M Schmiel, S B Ernst
BACKGROUND: German medical faculties currently have severe financial problems. There is the conflict between financing teaching medical students, inpatient and outpatient costs and supporting basic and applied research. METHODS: Young postdocs can apply for a grant to start research projects to establish techniques on publishing data as a basis for applying for grants from the German Research Foundation or foundations with a critical review system. Successful applicants from the years 1998-2011 were asked to answer a questionnaire...
October 12, 2016: Der Chirurg; Zeitschrift Für Alle Gebiete der Operativen Medizen
Xin Wen, Jian Zhou, Yancheng Li, Xiaoxia Qing, Qiang He
In this study, a novel process combined simultaneous partial nitrification, anammox and denitrification (SNAD) with denitrifying phosphorus removal (DPR) was proposed for advanced nitrogen removal. Firstly simulating sewage was introduced to a sequencing batch reactor (SBR) for organic matter removal and anaerobic phosphorus release (stage 1). Then effluent of stage 1 with low COD was discharged to a sequencing biofilm batch reactor (SBBR) for partial nitrification, anammox and partial denitrification (stage 2)...
October 5, 2016: Bioresource Technology
Mohd Hakim Ab Halim, Aznah Nor Anuar, Nur Syahida Abdul Jamal, Siti Izaidah Azmi, Zaini Ujang, Mustafa M Bob
The effect of temperature on the efficiency of organics and nutrients removal during the cultivation of aerobic granular sludge (AGS) in biological treatment of synthetic wastewater was studied. With this aim, three 3 L sequencing batch reactors (SBRs) with influent loading rate of 1.6 COD g (L d)(-1) were operated at different high temperatures (30, 40 and 50 °C) for simultaneous COD, phosphate and ammonia removal at a complete cycle time of 3 h. The systems were successfully started up and progressed to steady state at different cultivation periods...
October 6, 2016: Journal of Environmental Management
Yonglan Tian, Huayong Zhang, Yang Chai, Lijun Wang, Xueyue Mi, Luyi Zhang, Maxwell Adam Ware
The importance of nickel (added as NiCl2) on mesophilic anaerobic fermentation of Phragmites australis straw and cow dung was demonstrated by investigating the biogas properties, pH values, organic matter degradation [chemical oxygen demand (COD)] and enzyme activities (cellulase, protease and dehydrogenase) during the fermentation process. The results showed that Ni(2+) addition increased the cumulative biogas yields by >18 % by improving the efficiency of first peak stage and bringing forward the second peak stage...
October 7, 2016: Biodegradation
Antonella Bena, Manuela Orengia, Ennio Cadum, Elena Farina, Alessandro Alimonti, Beatrice Bocca, Monica Chiusolo, Elena De Felip, Martina Gandini, Anna Laura Iamiceli, Anna Pino, Enrico Procopio, Giuseppe Salamina
Only few studies on the health effect of waste incinerators were focused on human biomonitoring (HBM). Our aim is to describe a protocol for assessing early variation of selected items in a population group living close to a waste incinerator in Turin, Italy. A cohort of 394 subjects was randomly selected, among residents near the incinerator and residents far from it. To achieve this sample size, 765 subjects were contacted. The cohort was monitored before the start-up of the plant and will be followed up 1 and 3 years after, with measurements of respiratory function, selected blood and urine parameters including 19 metals, 17 congeners of PCDDs/Fs, 12 congeners of DL-PCBs, 30 congeners of NDL-PCBs, 11 OH-PAHs, specific hormones (T3, T4, TSH, cortisol and ACTH) and common health parameters...
November 2016: Environmental Monitoring and Assessment
Gyucheol Choi, Jaai Kim, Changsoo Lee
Mixed-culture fermentation that does not require an energy-intensive sterilization process is a viable approach for the economically feasible production of lactic acid (LA) due to the potential use of organic waste as feedstock. This study investigated mixed-culture LA fermentation of whey, a high-strength organic wastewater, in continuous mode. Variations in the hydraulic retention time (HRT) from 120 to 8 h under different pH regimes in two thermophilic reactors (55 °C) were compared for their fermentation performance...
October 5, 2016: Applied Microbiology and Biotechnology
S J Bi, X J Hong, G X Wang, Y Li, Y M Gao, L Yan, Y J Wang, W D Wang
To accomplish the rapid start-up and stable operation of biogas digesters, an efficient inoculum is required. To obtain such an inoculum for food waste anaerobic digestion, we domesticated dairy manure anaerobic digestion residue by adding food waste every day. After 36 days, the pH and biogas yield stabilized signifying the completion of domestication. During domestication, the microbial communities in the inocula were investigated by constructing 16S rDNA clone libraries. We evaluated the effect of the domesticated inoculum by testing batch food waste anaerobic digestion with a non-domesticated inoculum as a control...
August 19, 2016: Genetics and Molecular Research: GMR
K Van Wesenbeeck, B Hauchecorne, S Lenaerts
The effect of introducing a photocatalytically active coating inside a plasma unit is investigated. This technique combines the advantages of high product selectivity from catalysis and the fast start-up from plasma technology. In this study, a preselected TiO2 coating is applied on the collector electrode of a DC corona discharge unit as NTP reactor, in order to study the oxidation of ethylene. For both positive and negative polarities an enhanced mineralisation is observed while the formation of by-products drastically decreases...
October 3, 2016: Environmental Technology
Jeannine Millsteed, Janice Redmond, Elizabeth Walker
BACKGROUND/AIM: This study explored how occupational therapists in private practice developed the business skills needed to operate a successful private practice. The literature shows that many small-business owner-managers have poorly developed business skills, and some experience high rates of failure. This indicates that to be successful in private practice, occupational therapists need to gain mastery of management competencies in addition to their professional clinical competencies...
September 20, 2016: Australian Occupational Therapy Journal
Yingwen Chen, Jinlong Zhao, Kai Li, Shitao Xie
In this paper, a fast mass transfer anaerobic inner loop fluidized bed biofilm reactor (ILFBBR) was developed to improve purified terephthalic acid (PTA) wastewater treatment. The emphasis of this study was on the start-up mode of the anaerobic ILFBBR, the hydraulic loadings and the operation stability. The biological morphology of the anaerobic biofilm in the reactors was also analyzed. The anaerobic column could operate successfully for 46 days due to the pre-aerating process. The anaerobic column had the capacity to resist shock loadings and maintained a high stable chemical oxygen demand (COD) and terephthalic acid removal rates at a hydraulic retention time of 5-10 h, even under conditions of organic volumetric loadings as high as 28...
September 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
E Bousie, D van Blokland, H J W Lammers, A R H van Zanten
BACKGROUND/OBJECTIVES: Overfeeding in critically ill patients is associated with many complications. Propofol, dextrose infusion and citrate dialysis provide non-nutritional calories (NNCs), potentially causing overfeeding. The relevance of NNCs for total caloric intake has not been systematically studied. SUBJECTS/METHODS: We retrospectively studied adult mechanically ventilated intensive care unit (ICU) patients receiving enteral nutrition with or without supplemental parenteral nutrition...
September 14, 2016: European Journal of Clinical Nutrition
(no author information available yet)
[This corrects the article on p. 138 in vol. 2, PMID: 22263035.].
August 2016: Journal of Thoracic Disease
Jianbo Guo, Sihui Wang, Jing Lian, Huu Hao Ngo, Wenshan Guo, Yunman Liu, Yuanyuan Song
This study investigated the rapid start-up of the anaerobic ammonium oxidation (anammox) strategy by inoculating different biomass ratios of denitrifying granular sludge and anammox bacteria. The results demonstrated that two reactors (R1 and R2) were rapidly and successfully started-up on days 25 and 28, respectively, with nitrogen removal rates (NRRs) of 0.70kg/(m(3)·d) and 0.72kg/(m(3)·d) at biomass ratios of 10:1 (R1) and 50:1 (R2). The explanation for rapid start-up was found by examining the effect of five different sludge extracellular polymeric substances (EPS) on the activity of anammox bacteria in the batch experiments...
November 2016: Bioresource Technology
Weiming Yang, Hui Lu, Samir K Khanal, Qing Zhao, Liao Meng, Guang-Hao Chen
Sulfur-oxidizing bacteria (SOB) was successfully employed for effective autotrophic denitrification and sludge minimization in a full-scale application of saline sewage treatment in Hong Kong. In this study, a Granular Sludge Autotrophic Denitrification (GSAD) reactor was continuously operated over 600 days for SOB granulation, and to evaluate the long-term stability of SOB granules, microbial communities and denitrification efficacy. Sludge granulation initiated within the first 40 days of start-up with an average particle size of 186...
November 1, 2016: Water Research
Jose G Mantilla, Ernestine Middleton, Rouzan G Karabakhtsian
No abstract text is available yet for this article.
September 2016: Archives of Pathology & Laboratory Medicine
Borja Valverde-Pérez, Dorottya S Wágner, Bálint Lóránt, Arda Gülay, Barth F Smets, Benedek Gy Plósz
The new paradigm for used water treatment suggests the use of short solid retention times (SRT) to minimize organic substrate mineralization and to maximize resource recovery. However, little is known about the microbes and the underlying biogeochemical mechanisms driving these short-SRT systems. In this paper, we report the start-up and operation of a short-SRT enhanced biological phosphorus removal (EBPR) system operated as a sequencing batch reactor (SBR) fed with preclarified municipal wastewater, which is supplemented with propionate...
November 1, 2016: Water Research
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