Elifantz H.,Hebrew University of Jerusalem |
Elifantz H.,Israel Agricultural Research Organization |
Horn G.,Global Environmental Solutions Ltd. |
Ayon M.,Hebrew University of Jerusalem |
And 2 more authors.
FEMS Microbiology Ecology | Year: 2013
The formation of biofilms and biofouling is a common feature in aquatic environments. The aim of this study was to identify the primary colonizers of biofilm formed in Eastern Mediterranean Coastal water at different seasons and follow early dynamics of biofilm community development. Pre-treated coastal seawater and biofilm samples were collected from six different sampling events of 2 weeks' duration each during 1 year. The microbial community composition and specific abundance were estimated by 16S rRNA gene clone libraries and fluorescence in situ hybridization-confocal laser scanning microscopy (FISH-CLSM), respectively. The biofilm formed over the course of the year was fairly consistent in terms of community composition and overall abundance with the exception of spring season. Alphaproteobacteria (30-70% of total bacteria), in particular Rhodobacteraceae, were the dominant bacteria in the biofilm, regardless of season, followed by Bacteroidetes (5-35%) and Gammaproteobacteria (6-35%). There was a decrease in relative abundance of Alphaproteobacteria and an increase in the abundance of Bacteroidetes between the initial and 2-week-old biofilm. This observation may aid man-made facilities that have to deal with biofilm formation and help the development of appropriate strategies to control those biofilms. © 2013 Federation of European Microbiological Societies. Published by John Wiley & Sons Ltd.
Hasson D.,Technion - Israel Institute of Technology |
Segev R.,Technion - Israel Institute of Technology |
Lisitsin D.,Global Environmental Solutions Ltd. |
Liberman B.,IDE Technologies |
Semiat R.,Technion - Israel Institute of Technology
Desalination | Year: 2011
The present paper describes pilot plant development of a novel process enabling increase of water recovery in brackish water desalination without using any chemicals. This is achieved by precipitating the scaling salts of a carbonate-rich concentrate by increasing the pH through air stripping of CO2 from the solution. Additional permeate is extracted from the treated concentrate by a secondary RO unit. The pilot plant data confirmed that a precipitation conversion of CaCO3 of at least 70% can be achieved by the aeration process at a retention time of about 2 h in the precipitation vessel. Integration of the concentrate treatment with the primary desalination process enabled increase of the overall water recovery from 78% to 90%. Higher recoveries exceeding 95% can be anticipated in processing concentrate solutions of sufficiently high carbonate content. © 2011 Elsevier B.V.
Drak A.,Global Environmental Solutions Ltd. |
Adato M.,Global Environmental Solutions Ltd.
Desalination | Year: 2014
In brackish water RO desalination, the low feed water TDS and relatively low brine flow make the use of energy recovery devices ambiguous. The decision to implement energy recovery device must always be based on the Life Cycle Cost estimation of the plant. Design considerations concerning the energy recovery device selection and field experience in Lahat brackish water desalination plant (40,000m3/day) are presented in this article.Two types of energy recovery device are generally considered in the brackish water RO desalination, turbocharger and isobaric energy recovery devices. Taking into consideration the simplicity of the turbocharger, it was selected for the 1st phase of the Lahat brackish water desalination plant with the design recovery range of 80%-88%. The turbocharger was designed for max recovery and external bypass line was added to operate the plant at low recoveries. For such wide recovery range the turbocharger entire efficiency range of 30%-40% was achieved.Due to the limitation of the turbocharger to operate efficiently at the broad recovery range and Life Cycle Cost benefits of isobaric energy recovery device, the isobaric energy recovery device was selected for the 2nd phase of the Lahat brackish water desalination plant. © 2014 Elsevier B.V.
Global Environmental Solutions Inc | Date: 2011-05-20
Linear pressure reducer apparatus for regulating injection pressure of a water-soluble polymer solution in injection wellheads, in an enhanced oil recovery system, including modules connected in series to the main injection pipe and each consisting of tubes of identical diameter but variable length, the apparatus allows variations to be made to pressure drop by adjusting the length of the tube through which the solution flows by closing or opening modules, without substantial degradation to the viscosity of the solution during its passage through the module. Installation for enhanced oil recovery implementing the apparatus.
Global Environmental Solutions Inc. | Date: 2016-12-22
Chemical additives for fuel.