大型反渗透海水淡化系统双端产水脱硼工艺研究

针对大型反渗透海水淡化系统,设计了一种双端产水脱硼工艺,并采用反渗透系统模拟软件研究了二级进水pH值、海水温度和硼含量等参数对工艺脱硼效果的影响。结果表明,该工艺能有效脱除海水中的硼,当二级进水pH值为9.5时,产水水质可以达标。当海水温度和硼含量均较低时,仅开启一级系统时产水水质即可达标;当海水温度>13℃或硼含量>2.3 mg/L时,需启用二级系统进一步脱硼;当海水温度>30℃或硼含量>6.0 mg/L时,还需适当提高二级进水pH值来增强反渗透膜的脱硼率,以实现产水硼含量达标。与常规脱硼工艺相比,双端产水脱硼工艺通过减少43%的二级系统处理规模,使二级系统的建设投资成本和运行成本均减少43%。

Double-end Deboronization Process for Large-scale Reverse Osmosis Desalination System

A double-end deboronization process was designed and applied in a large-scale reverse osmosis desalination system,and the effects of secondary influent pH,seawater temperature and boron content on deboronization performance of the process were explored by using reverse osmosis system analysis software.The novel process could effectively remove boron in seawater.When the pH of the secondary influent was 9.5,the fresh water quality could reach the standard.When the seawater temperature and boron content were low,the fresh water quality could reach the standard by only operating the first-stage system.When the temperature was higher than 13℃or the boron content was more than 2.3 mg/L,the second-stage system should be started for further deborating.When the temperature was higher than 30℃or the boron content was more than 6.0 mg/L,pH of the secondary influent had to be appropriately increased to improve the deborization rate,so as to achieve the boron content in the fresh water reaching the standard.Compared with traditional deboronization process,double-end deboronization process could reduce the treatment scale of the second-stage system by 43%,and the construction investment and operation cost of the secondary system were both reduced by 43%.