SHMP as Antiscalant for Treating Brackish Water using Reverse Osmosis

M. Ansari
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引用次数: 2

Abstract

One of the most genuine issues found in desalination utilizing reverse osmosis (RO) is concentrate or administration of brine. This concentrate can be utilized as a raw material for production of minerals. The antiscalants present in the RO handle ought to be removed after the process of salt crystallization. The precipitation of the amount of sulfate and carbonate from calcium can be modulated by the antiscalants in the process of reverse osmosis. However, the modulation of calcium phosphate has not been highlighted in literature. This gap in the literature instigated us to explore the activity of the antiscalants in the scaling of calcium phosphate in the RO blocks by a mild method. Nowadays, most RO desalination plants are utilizing phosphorus-based antiscalants to prevent scaling and to realize tall layer execution, as measured by diminished transmembrane weight, salt entry, and expanded saturate stream. In any case, phosphorus antiscalants in brine disposal can be an natural issue that ought to be considered and considered when introducing a desalination plant. Sodium Hexametaphosphate (SHMP) is reckoned excellent antiscalant agent which utilizes to deal with scaling in RO films. The sodium hexametaphosphate solution is prepared by mixing in sodium hexametaphosphate vessel and dosed to the feed water through. However, the apparatus containing sodium hexametaphosphate was highly prone to contamination by bacteria. The amount of bacteria within the apparatus after 36 days of makeup was far too high to be analysed as it reached a value of beyond Too Numerous To Count (TNTC). The polyphosphate can be transformed into orthophosphate in presence of sodium hexametaphosphate solution. The conversion is influenced by parameters like temperature, concentration and different nutrients responsible for the growth of microbes. Thus a study was conducted for the detection of free phosphate in a solution of sodium hexametaphosphate. Since hydrogen sulfide (H2S) can be generated in raw water, the use of chlorine was averted completely. The tanks and injection lines containing sodium hexametaphosphate solution was disinfected using sodium metabisulfite (SBS). The optimum concentration of sodium metabisulphate solution required for sterilization along with reducing the formation of the free phosphate was studied. The reaction of the SBS in the apparatus containing sodium hexametaphosphate solution was studied. Furthermore the interaction between the SBS with the sodium hexametaphosphate solution in connection with the Microguard Filter (MGF) influencing the efficacy and output of the RO system was studied.
SHMP作为反渗透处理微咸水的阻垢剂
在利用反渗透(RO)脱盐中发现的最真实的问题之一是盐水的浓缩或管理。该精矿可用作生产矿物的原料。防垢剂存在于RO手柄应在盐结晶过程后去除。在反渗透过程中,抗垢剂可以调节钙中硫酸盐和碳酸盐的析出量。然而,磷酸钙的调节在文献中并没有被强调。这一文献上的空白促使我们通过温和的方法探索抗垢剂在RO块中磷酸钙结垢的活性。如今,大多数反渗透海水淡化厂都使用基于磷的抗垢剂来防止结垢并实现高层执行,通过减少跨膜重量、盐进入和扩大饱和流来衡量。在任何情况下,在盐水处理中的磷抗垢剂都是一个自然问题,在引入海水淡化厂时应该考虑和考虑。六偏磷酸钠(SHMP)被认为是处理反渗透膜结垢的优良阻垢剂。在六偏磷酸钠容器中混合制备六偏磷酸钠溶液,并通过加药到给水中。然而,含有六偏磷酸钠的仪器很容易被细菌污染。化妆36天后,设备内的细菌数量太高,无法进行分析,因为它达到了“数不清”(TNTC)的值。在六偏磷酸钠溶液的存在下,聚磷酸盐可转化为正磷酸盐。这种转化受到温度、浓度和负责微生物生长的不同营养物质等参数的影响。因此,对六偏磷酸钠溶液中游离磷酸盐的检测进行了研究。由于在原水中可以产生硫化氢(H2S),因此完全避免了氯的使用。用焦亚硫酸钠(SBS)对含六偏磷酸钠溶液的储罐和注射管道进行消毒。研究了灭菌所需的最佳焦硫酸钠溶液浓度以及减少游离磷酸盐的形成。研究了SBS在六偏磷酸钠溶液装置中的反应。此外,还研究了SBS与六偏磷酸钠溶液以及微保护过滤器(Microguard Filter, MGF)的相互作用对反渗透系统效率和产量的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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