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CO2 removal

Jing-Han Wang, Tian-Yuan Zhang, Guo-Hua Dao, Xue-Qiao Xu, Xiao-Xiong Wang, Hong -Ying Hu
Reuse of secondary municipal effluent from wastewater treatment plants in water bodies could effectively alleviate freshwater resource shortage. However, excessive nutrients must be efficiently removed to prevent eutrophication. Compared with other means of advanced wastewater treatment, microalgae-based processes display overwhelming advantages including efficient and simultaneous N and P removal, no requirement of additional chemicals, O2 generation, CO2 mitigation, and potential value-added products from harvested biomass...
February 17, 2017: Applied Microbiology and Biotechnology
Marek Kawecki, Wojciech Łabuś, Agnieszka Klama-Baryla, Diana Kitala, Malgorzata Kraut, Justyna Glik, Marcelina Misiuga, Mariusz Nowak, Tomasz Bielecki, Aleksandra Kasperczyk
The natural extracellular matrix (ECM),thanks to its specific properties (e.g., collagenous lattice, a reservoir of growth factors, ECM-cell anchoring areas, an optimal pH and CO2 ),ensures an optimal microenvironment for homeostatic and regenerative cell development. In the context of regenerative medicine, ECM is a lair for residual and infiltrative cells. The aim of the clinical usage of cell-free ECM scaffolds is the enhancement of tissue regeneration with possible minimization of an adverse host reaction on allogeneic or xenogeneic biomaterial...
February 14, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Johannes Kalbhenn, Nadine Neuffer, Barbara Zieger, Axel Schmutz
Extracorporeal CO2-Removal (ECCO2R) is promoted with attributes like "safe" and "less invasive" compared to (high-flow) veno-venous ECMO-Systems. With our experience in coagulation disorders during ECMO-therapy with this observational study we for the first time prospectively evaluate hemolysis and coagulation disorders during ECCO2R. Eight consecutive patients with predominant hypercapnic respiratory failure were treated with the Hemolung® Respiratory Assist System (RAS) (Alung-Technologies, Pittsburg, USA)...
February 7, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
Yunxi Yao, Jason P Coyle, Seán T Barry, Francisco Zaera
The thermal chemistry of Cu(I)-sec-butyl-2-iminopyrrolidinate, a promising copper amidinate complex for atomic layer deposition (ALD) applications, was explored comparatively on several surfaces by using a combination of surface-sensitive techniques, specifically temperature-programmed desorption and x-ray photoelectron spectroscopy (XPS). The substrates explored include single crystals of transition metals (Ni(110) and Cu(110)), thin oxide films (NiO/Ni(110) and SiO2/Ta), and oxygen-treated metals (O/Cu(110))...
February 7, 2017: Journal of Chemical Physics
Zhen-Ji Guo, Jiamei Yu, Yong-Zheng Zhang, Jian Zhang, Ya Chen, Yufeng Wu, Lin-Hua Xie, Jian-Rong Li
Three new water-stable In(III)-based metal-organic frameworks, namely, [In3(TTTA)2(OH)3(H2O)]·(DMA)3 (BUT-70, DMA = N,N-dimethylacetamide), [In3(TTTA)2(CH3O)3] (BUT-70A), and [In3(TTTA)2(OH)3] (BUT-70B), with rod-shaped secondary building units (SBUs) and an new acrylate-based ligand, (2E,2'E,2″E)-3,3',3″-(2,4,6-trimethylbenzene-1,3,5-triyl)-triacrylate (TTTA(3-)) were obtained and structurally characterized. BUT-70A and -70B were generated in a single-crystal to single-crystal transformation fashion from BUT-70 through guest exchange followed by their removal...
February 6, 2017: Inorganic Chemistry
Caroline Delaire, Susan Amrose, Minghui Zhang, James Hake, Ashok Gadgil
Iron electrocoagulation (Fe-EC) has been shown to effectively remove arsenic from contaminated groundwater at low cost and has the potential to improve access to safe drinking water for millions of people. Understanding how operating conditions, such as the Fe dosage rate and the O2 recharge rate, affect arsenic removal at different pH values is crucial to maximize the performance of Fe-EC under economic constraints. In this work, we improved upon an existing computational model to investigate the combined effects of pH, Fe dosage rate, and O2 recharge rate on arsenic removal in Fe-EC...
January 18, 2017: Water Research
Dong Wei, Keyi Zhang, Huu Hao Ngo, Wenshan Guo, Siyu Wang, Jibin Li, Fei Han, Bin Du, Qin Wei
In present study, the feasibility of partial nitrification (PN) process achievement and its greenhouse gas emission were evaluated in a sequencing batch biofilm reactor (SBBR). After 90days' operation, the average effluent NH4(+)-N removal efficiency and nitrite accumulation rate of PN-SBBR were high of 98.2% and 87.6%, respectively. Both polysaccharide and protein contents were reduced in loosely bound extracellular polymeric substances (LB-EPS) and tightly bound EPS (TB-EPS) during the achievement of PN-biofilm...
January 25, 2017: Bioresource Technology
Ánxela Fernández-Naveira, Haris Nalakath Abubackar, María C Veiga, Christian Kennes
Bioprocesses in conventional second generation biorefineries are mainly based on the fermentation of sugars obtained from lignocellulosic biomass or agro-industrial wastes. An alternative to this process consists in gasifying those same feedstocks or even other carbon-containing materials to obtain syngas which can also be fermented by some anaerobic bacteria to produce chemicals or fuels. Carbon monoxide, carbon dioxide and hydrogen, which are the main components of syngas, are also found in some industrial waste gases, among others in steel industries...
March 2017: World Journal of Microbiology & Biotechnology
Masoud Yahoo, Jamal Othman
The impact of global warming has received much international attention in recent decades. To meet climate-change mitigation targets, environmental policy instruments have been designed to transform the way goods and services are produced as well as alter consumption patterns. The government of Malaysia is strongly committed to reducing CO2 gas emissions as a proportion of GDP by 40% from 2005 levels by the year 2020. This study evaluates the economy-wide impacts of implementing two different types of CO2 emission abatement policies in Malaysia using market-based (imposing a carbon tax) and command-and-control mechanism (sectoral emission standards)...
January 30, 2017: Science of the Total Environment
T Wollersheim, S Frank, M C Müller, V Skrypnikov, N M Carbon, P A Pickerodt, C Spies, K Mai, J Spranger, S Weber-Carstens
PURPOSE: Indirect calorimetry (IC) is the gold standard for measuring energy expenditure (EE). Due to O2 uptake and CO2 removal by both the extracorporeal lung support (ECLS) membrane and the lungs, a conventional IC is not feasible and no data available. Our MEEP (Measuring Energy Expenditure in ECLS Patients) protocol enables the determination of the REE in patients with ECLS, the comparison to patients without ECLS, and accuracy assessment of estimating equations. METHODS: In the MEEP protocol, a conventional IC is performed and extended by a calculation of the O2 uptake and the CO2 elimination by the ECLS membrane...
January 16, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
Yizhuo Yang, Xinghui Zhao, Xiuli Li, Zhifeng Yan, Zhongyu Liu, Yali Li
Failure in early diagnosis and ineffective treatment are the major causes of ovarian cancer mortality. Hyaluronan and its receptor, cluster of differentiation (CD)44, have been considered to be valid targets for treating cancer. The anti-CD44 monoclonal antibody IM7 is effective in treating ovarian cancer; however, its toxicity should not be ignored. The present study has developed a new drug carrier system composed of chitosan nano-particles coated with polylactic acid (PLA) to improve the treatment efficacy and reduce toxicity...
January 2017: Oncology Letters
Jian-Qiang Shen, Pei-Qin Liao, Dong-Dong Zhou, Chun-Ting He, Jun-Xi Wu, Wei-Xiong Zhang, Jie-Peng Zhang, Xiao-Ming Chen
The paddle-wheel type cluster Co2(RCOO)4(L(T))2 (R = substituent group, L(T) = terminal ligand), possessing unusual metal coordination geometry compared with other cobalt compounds, may display high catalytic activity but is highly unstable especially in water. Here, we show that with judicious considerations of the host/guest geometries and modular synthetic strategies, the labile dicobalt clusters can be immobilized and stabilized in a metal-organic framework (MOF) as coordinative guests. The Fe(na)4(L(T)) fragment in the MOF [{Fe3(μ3-O)(bdc)3}4{Fe(na)4(L(T))}3] (H2bdc = 1,4-benzenedicaboxylic acid, Hna = nicotinic acid) can be removed to give [{Fe3(μ3-O)(bdc)3}4] with a unique framework connectivity possessing suitable distribution of open metal sites for binding the dicobalt cluster in the form of Co2(na)4(L(T))2...
January 26, 2017: Journal of the American Chemical Society
Dison S P Franco, Eduardo H Tanabe, Daniel A Bertuol, Glaydson S Dos Reis, Éder C Lima, Guilherme L Dotto
Alternative treatments, such as, NaOH, ultrasound assisted (UA) and supercritical CO2 (SCO2), were performed to improve the potential of rice husk as adsorbent to remove methylene blue (MB) from aqueous media. All the treatments improved the surface characteristics of rice husk, exposing its organic fraction and/or providing more adsorption sites. The Langmuir and Hill models were able to explain the MB adsorption for all adsorbents in all studied temperatures. The experimental and modeled parameters demonstrated that the MB adsorption was favored by the temperature increase and by the use of NaOH-rice husk...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Rhys Jon Jones, Jaime Massanet-Nicolau, Martijn J J Mulder, Giuliano Premier, Richard Dinsdale, Alan Guwy
Electrodialysis (ED) removed volatile fatty acids (VFAs) from a continually-fed, hydrogen-producing fermenter. Simultaneously, electrochemical removal and adsorption removed gaseous H2 and CO2, respectively. Removing VFAs via ED in this novel process increased H2 yields by a factor of 3.75 from 0.24molH2mol(-1)hexose to 0.90molH2mol(-1)hexose. VFA production and substrate utilisation rates were consistent with the hypothesis that end product inhibition arrests H2 production. The methodology facilitated the recovery of 37g of VFAs, and 30L H2 that was more than 99% pure, both of which are valuable, energy dense chemicals...
April 2017: Bioresource Technology
S Gebauer, J L Grenfell, J W Stock, R Lehmann, M Godolt, P von Paris, H Rauer
Understanding the evolution of Earth and potentially habitable Earth-like worlds is essential to fathom our origin in the Universe. The search for Earth-like planets in the habitable zone and investigation of their atmospheres with climate and photochemical models is a central focus in exoplanetary science. Taking the evolution of Earth as a reference for Earth-like planets, a central scientific goal is to understand what the interactions were between atmosphere, geology, and biology on early Earth. The Great Oxidation Event in Earth's history was certainly caused by their interplay, but the origin and controlling processes of this occurrence are not well understood, the study of which will require interdisciplinary, coupled models...
January 2017: Astrobiology
L LoftiKatooli, A Shahsavand
Conventional molecular simulation techniques such as grand canonical Monte Carlo (GCMC) strictly rely on purely random search inside the simulation box for predicting the adsorption isotherms. This blind search is usually extremely time demanding for providing a faithful approximation of the real isotherm and in some cases may lead to non-optimal solutions. A novel approach is presented in this article which does not use any of the classical steps of the standard GCMC method, such as displacement, insertation, and removal...
January 2017: Journal of Molecular Modeling
Yuheng Luo, Hong Chen, Bing Yu, Jun He, Ping Zheng, Xiangbing Mao, Gang Tian, Jie Yu, Zhiqing Huang, Junqiu Luo, Daiwen Chen
BACKGROUND: Pea fiber (PF) is a potential fibrous supplement in swine production. The influence of dietary PF on microbial community in the colon of pigs remains largely unexplored. Methanogens in the hindgut of monogastric animals play important roles in degradation of dietary fibers and efficient removal of microbial metabolic end product H2. Understanding the impact of dietary PF on the structure of colonic methanogens may help understand the mechanisms of microbe-mediated physiological functions of PF...
January 17, 2017: BMC Microbiology
Joel L Cohen, Roy Geronemus
BACKGROUND & OBJECTIVE: Surgical scars are an unwanted sequela following surgical procedures. Several different treatment modalities and approaches are currently being employed to improve the cosmesis of surgical scars with each having varying degrees of success. The objective of this study was to assess the ef cacy and safety pulsed dye laser treatment, CO2 ablative fractional resurfacing, and a combined treatment with these two modalities for the cosmetic improvement of surgical scarring that occurred following the surgical removal of skin cancer from different anatomic areas...
November 1, 2016: Journal of Drugs in Dermatology: JDD
Ebrahim Tilahun, Alper Bayrakdar, Erkan Sahinkaya, Bariş Çalli
H2S in biogas affects the co-generation performance adversely by corroding some critical components within the engine and it has to be removed in order to improve the biogas quality. This work presents the use of polydimethylsiloxane (PDMS) membrane contactor for selective removal of H2S from the biogas. Experiments were carried out to evaluate the effects of different pH of absorption liquid, biogas flowrate and temperature on the absorption performances. The results revealed that at the lowest loading rate (91mg H2S/m(2)·h) more than 98% H2S and 59% CO2 absorption efficiencies were achieved...
January 13, 2017: Waste Management
Dong-Zhi Chen, Ning-Xin Jiang, Jie-Xu Ye, Zhuo-Wei Cheng, Shi-Han Zhang, Jian-Meng Chen
Bioremediation usually exhibits low removal efficiency toward hexane because of poor water solubility, which limits the mass transfer rate between the substrate and microorganism. This work aimed to enhance the hexane degradation rate by increasing cell surface hydrophobicity (CSH) of the degrader, Pseudomonas mendocina NX-1. The CSH of P. mendocina NX-1 was manipulated by treatment with starch and chitosan solution of varied concentrations, reaching a maximum hydrophobicity of 52%. The biodegradation of hexane conformed to the Haldane inhibition model, and the maximum degradation rate (ν max) of the cells with 52% CSH was 0...
January 14, 2017: Applied Microbiology and Biotechnology
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