Download product sheet Reverse Osmosis - Kurita Europe GmbH

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water management process management Trouble-free Operation Antiscalants (Kurifloat Series) Biocides © 2012 Kurita Europe GmbH Kurita Europe GmbH Regular monitoring of the operational performance of the plant as well as performing regular maintenance are basic conditions for a trouble-free operation. One of the main goals for trouble-free operation is to effectively protect the membranes against fouling and scaling. This is to maximize the life span and run length of the membranes. Our research and development activities have resulted in a complete line-up of many diverse antiscalants in order to prevent all types of possible scaling on the membranes effectively. We have directed our special attention to the selection of the most suitable antiscalant for each specific application and supply water quality. Our antiscalants offer excellent inhibiting effects for: Colloids and suspended matter Iron and manganese Calcium carbonate Calcium sulfate Strontium sulfate Barium sulfate Silicate Our product portfolio contains antiscalants with NSF-certification. Biological, organic and inorganic contaminations present in the supply-water are deposited on the surface of the membranes. The deposition of those contaminations from the impure supply water on the membrane surface is generally referred to as „fouling“. If organic contaminations from the impure supply water are adsorbed, it is often referred to as „organic fouling“. The adsorption of micro-organisms to the surface of membranes is designated as „biofouling“. Embedded in a gel, the micro-organisms deposit from extracellular polymers as biofilm on the surface of a membrane. Biofouling is particularly problematic since micro-organisms can reproduce on the membrane surface and therefore substantially affect the efficiency of the plant. In order to prevent the process of biofouling effectively, the addition of biocides is essential. For this, Kurita has developed special biocides which contribute to the economical operation of your reverse osmosis plant. Our technology is characterized by: Low dosing rates Dispersion of existing biofilms Prevention of germ resistance www.kurita.de Product Sheet Reverse Osmosis, page 2
water management process management Pretreatment Cleaning of Membranes © 2012 Kurita Europe GmbH Kurita Europe GmbH To achieve a long run length of the RO membranes, it is beneficial to reduce the load on the membranes as much as possible by using an effective pretreatment of the feedwater. Depending on the raw-water quality, this pretreatment could consist of coagulation, flocculation, sedimentation, filtration etc. Kurita possesses expert-knowledge and has developed special and innovative products for this application range. On the basis of diverse analytical test-observations and calculations, such as Silt Density Index, a selection of the best performing products could already be achieved in the laboratory testing stage. An effective pre-treatment of water is the basis for a smooth operation of the reverse osmosis plant. However, it cannot be prevented that fouling processes and scaling processes on membranes result in a decrease of performance during the time of operation. This increases the energy demand of the plant while the quality of the produced water diminishes. The loss of performance results from colloidal and microbiological depositions as well as from deposits of metal hydroxides. In addition, deposits of CaCO 3, CaSO 4, SiO 2, BaSO 4, CaF 2 also reduce the yield of permeate. For this reason, it is necessary to clean the membranes regularly. Specific demands require individual solutions in the establishment of the proper cleaning procedure. For this reason, we perform a range of preliminary investigations in order to develop a suitable cleaning procedure. The following aspects are of importance: Autopsy of membranes Performance tests Analysis of water Purification test Analysis of deposits Energy Considerations Increasing energy costs directly influence the costs of the production of reverse osmosis water. The energy consumption of the high-pressure pumps play a central role. Regular monitoring of the pressure losses across the membranes and the flow rates are important control parameters that give valuable information on possible scaling or fouling on the membranes. A further important aspect in the examination of energy consumption and saving is the preheating of the feed stream by means of waste heat from other processes as water temperature has a dramatic influence on the production of permeate. Best choice for you is Kurita as your partner. Kurita´s engineers look at your plant as an entire unit in order to achieve the best cost performance in an efficient and effective way. www.kurita.de Product Sheet Reverse Osmosis, page 3
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