Evaluation of the first seven years operating data of a RO brackish water desalination plant in Las Palmas, Canary Islands, Spain

Evaluation of the first nine years operating data of a RO brackish water desalination plant in Las Palmas, Canary Islands, Spain

Evaluation of the five years operating data of a RO brackish water desalination plant in Las Palmas, Canary Islands, Spain: a historic case

Long-term performance decline in a brackish water reverse osmosis desalination plant. Predictive model for the water permeability coefficient

Long-term intermittent operation of a full-scale BWRO desalination plant

Estimation of the maximum conversion level in reverse osmosis brackish water desalination plants

Effects of water matrix on the rejection of neutral pharmaceutically active compound by thin-film composite nanofiltration and reverse osmosis membranes

ChemInformVolume 20, Issue 19 Physical Organic Chemistry ChemInform Abstract: Vibrational Spectra and Thermodynamic Properties of Thiazole, 2-Aminothiazole, 2-Amino-(2H)-thiazole and 2-Amino-(2H2)-thiazole J. F. ARENAS, J. F. ARENAS Dep. Chem., Polytech. Univ. Canary Islands, Las Palmas, SpainSearch for more papers by this authorJ. PEREZ-PENA, J. PEREZ-PENA Dep. Chem., Polytech. Univ. Canary Islands, Las Palmas, SpainSearch for more papers by this authorM. GONZALEZ-DAVILA, M. GONZALEZ-DAVILA Dep. Chem., Polytech. Univ. Canary Islands, Las Palmas, SpainSearch for more papers by this author J. F. ARENAS, J. F. ARENAS Dep. Chem., Polytech. Univ. Canary Islands, Las Palmas, SpainSearch for more papers by this authorJ. PEREZ-PENA, J. PEREZ-PENA Dep. Chem., Polytech. Univ. Canary Islands, Las Palmas, SpainSearch for more papers by this authorM. GONZALEZ-DAVILA, M. GONZALEZ-DAVILA Dep. Chem., Polytech. Univ. Canary Islands, Las Palmas, SpainSearch for more papers by this author First published: May 9, 1989 https://doi.org/10.1002/chin.198919051Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume20, Issue19May 9, 1989 RelatedInformation

A design method of the RO system in reverse osmosis brackish water desalination plants (procedure)

This paper is based on the study for the evaluation of the processes of reuse and recycling of reverse osmosis components and membranes in the Canary Islands and Macaronesia, within the DESAL+ project and in the framework of the DESAL+ LIVING LAB platform, coordinated by the Canary Islands Technological Institute (ITC) and the Canary Islands Agency for Research, Innovation and Information Society (ACIISI), with the support of the Interreg-MAC Programme. Reverse osmosis membranes could be reused in the same or another desalination plant by replacing the membranes in the first, dirtier positions with those in the last, less damaged positions. Also, by changing the best first-stage membranes to the second and vice versa, the useful life of these membranes could be extended through chemical cleaning and a second life could be given in tertiary treatment plants, reuse in industrial processes where they use special reverse osmosis membranes and degrade rapidly, in processes with leachate from landfill waste and also an interesting option is the oxidation of reverse osmosis elements to obtain nano-filtration, ultrafiltration or micro-filtration membranes for the removal of physical dirt. The main categories of thermal processing recycling commonly used in industry include incineration and pyrolysis to produce energy, gas and fuel. These processes can be applied to mixed plastic waste, such as the combination of materials used in the manufacture of reverse osmosis membranes. The recycling of reverse osmosis elements from desalination plants is shown as an opportunity, nowadays existing pioneering initiatives in Europe. Energy recovery, via incineration, is feasible but is not considered in accordance with the environmental, social and political problems that this may generate. However, the recycling of the reverse osmosis elements via pyrolytic industry for fuel production can be centralized in a new industry already planned in the Canary Islands and all the osmosis membranes that are obsolete can be sent there. This is a technically and economically viable business opportunity with a promising future in today's recycling market as studied in the paper.

Permeability is an import character of soil, especially in excavation and tunnelling. Hollow cylindrical apparatus (HCA) is often used to determine soil anisotropy, particularly soil strength and stiffness under different directions of major principal stress, so complex stress paths can be simulated and the corresponding soil properties can be examined. It can also be used to determine the permeability coefficient if a special mode is added, therefore the seepage test can be expected. Owing to no seepage test has been conducted by HCA before, the complete procedure of HCA seepage tests after static and dynamic loading are respectively studied. And the seepage stability stage is discussed since only data in this stage are valid and reliable for permeability calculation. The results show that:1) when the difference in average permeability coefficient within unit time (3600 seconds) less than 2% in 24h, it is reliable to take the average permeability coefficient in this period as the ultimate permeability in static seepage test; 2) for dynamic test, if the average permeability in 3600 seconds varies with 5% in 24h, the average permeability coefficient in this period can be taken as the ultimate value. Research in this paper provides a solid foundation for HCA seepage test under complex stress paths.

Implication of zeta potential at different salinities on boron removal by RO membranes

From 19 September to 13 December 2021, a volcanic eruption took place at Las Palmas, Canary Islands. Thereby, fine ash and volatiles, like SO2, were emitted and transported over hundreds to thousand kilometers away from the island [1]. At the same time, continuous lidar observations with the multiwavelength-Raman-polarization lidar PollyXT were performed at the Ocean Science Center Mindelo (16.878°N, 24.995°W), Cabo Verde, in the frame of the JATAC-campaign 2021/2022. During autumn, typical aerosol conditions over Mindelo, as detected by the lidar, are a clean marine boundary layer up to approx. 1 km and a Saharan dust layer (up to 6 km) above. In the boundary layer, an extinction coefficient of less than 200 Mm-1 and a lidar ratio smaller than 40 sr is typically observed while a lidar ratio between 40 and 60 sr and a depolarization ratio between 20 and 30 % is typically found for the Saharan dust properties. Instead, during the time of the volcanic eruption, a strongly polluted planetary boundary layer (PBL) was observed beginning 23 of September, whereby the extinction coefficient and the lidar ratio increased up to 800 Mm-1 and 60 to 80 sr, respectively. On specific days, the aerosol optical depth, determined by an AERONET sun photometer, was as high as 1.0 (at 500 nm). Due to the small depolarization ratio around 0 % in the PBL and Hysplit trajectories indicating air masses coming from Canary Islands, the observed pollution over Mindelo can be attributed to sulfates emitted by the volcanic eruption at Las Palmas. No indications for volcanic ash over Mindelo were found, neither in the PBL nor in the lofted layer (mainly Saharan dust). This is furthermore supported by Hysplit trajectories, which show that air masses in higher altitudes come from the African continent and not from the Canary Islands. The potential of Aeolus to capture the volcanic plume on its way to Cabo Verde will also be assessed using the aerosol spin-off products (L2A) of the most recently available baseline. References[1] Carracedo, J. C., Troll, V. R., Day, J. M., Geiger, H., Aulinas, M., Soler, V., ... & Albert, H. (2022). The 2021 eruption of the Cumbre Vieja Volcanic Ridge on La Palma, Canary Islands. Geology Today, 38(3), 94-107.

Biofouling has been referred to as “the Achilles heel” of reverse osmosis (RO) membrane technology; the main cause being polyamide RO membranes lack of chlorine tolerance. Biofouling increases the operating cost of water treatment by increasing RO system feed pressure (i.e., energy demand) and increasing membrane cleaning frequency, which increases downtime and reduces membrane useful life. For waters with known high biofouling potential, plant designs also may require more extensive pretreatment, which increases capital and operating costs as well as the footprint of a desalination plant. It is known from the literature that the three keys to fending off biofouling in RO systems and/or recovering from biofouling once it takes root include (1) understanding site-specific processes governing biofilm formation, (2) implementing effective biofouling pretreatment ahead of RO membranes, and (3) monitoring biofouling to enable more proactive and effective RO membrane cleaning. Herein, we present four case studies of RO membrane biofouling in seawater, municipal wastewater, brackish groundwater and industrial wastewater. Next, we describe what is known about the causes and consequences of bacterial biofilm formation and growth through a process level RO membrane biofouling model. Finally, we review common biofouling control methods including pre-treatment, chemical cleaning and the most common strategies for monitoring biofouling in RO membrane systems.

Reverse osmosis (RO) is the most widely used technology for seawater desalination purposes. The long-term operating data of full-scale plants is key to analyse their performance under real conditions. The studied seawater reverse osmosis (SWRO) desalination plant had a production capacity of 5000 m3/d for irrigation purposes. The operating data such as conductivities flows, and pressures were collected for around 27,000 h for 4 years. The plant had sand and cartridge filters without chemical dosing in the pre-treatment stage, a RO system with one stage, 56 pressure vessels, seven RO membrane elements per pressure vessel and a Pelton turbine as energy recovery device. The operating data allowed to calculate the average water and salt permeability coefficients (A and B) of the membrane as well as the specific energy consumption (SEC) along the operating period. The calculation of the average A in long-term operation allowed to fit the parameters of three different models used to predict the mentioned parameter. The results showed a 30% decrease of A, parameter B increase around 70%. The SEC was between 3.75 and 4.25 kWh/m3. The three models fitted quite well to the experimental data with standard deviations between 0.0011 and 0.0015.

A design method of the RO system in reverse osmosis brackish water desalination plants (calculations and simulations)