结晶造粒法中CO_(2)-NaOH联用技术软化高硬度水静态试验  

Static Test on Softening of High Hardness Water by Combined Technology of CO_(2)-NaOH in Crystallization and Granulation

作　　者：雷春元 胡瑞柱 李恺弘 黄廷林[2] LEI Chunyuan;HU Ruizhu;LI Kaihong;HUANG Tinglin(Xi′an Water Supply Co.,Ltd.,Xi′an 710082,China;School of Environmental and Municipal Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西安市自来水有限公司,陕西西安710082 [2]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《净水技术》2022年第10期38-42,共5页Water Purification Technology

基　　金：国家重点研发计划(2016YFC0400706)。

摘　　要：工业生产中会产生大量CO_(2)气体,将其回收再利用可在有效降低碳排量的同时实现CO_(2)资源化。现有研究结果表明,化学结晶造粒流化床系统处理不同工业水均可获得良好的软化效果,该系统目前采用NaOH、Na_(2)CO_(3)等碱性药剂作为软化剂。文中将CO_(2)作为软化药剂,与NaOH同时应用于化学结晶造粒法中进行静态试验,通过控制药剂投加量配比、反应温度、反应压力,对该技术的应用效果进行研究。试验结果表明,当试验压力为2.5 kg/m^(2)、水温为20℃、CO_(2)与NaOH投加量分别为3.5 mmol/L和2.5 mmol/L时,水中Ca^(2+)去除率为85.0%,总硬度去除率为74.0%。与目前生产上采取的软化药剂相比,CO_(2)和NaOH联合软化处理具有出水pH易控制、水质稳定性高、操作便捷以及运行成本低等优点。A large amount of CO_(2)gas is produced in industrial production,it can effectively reduce carbon emissions and realize CO_(2)resource utilization by recycling and reusing.The existing research results show that the chemical crystallization and granulation fluidized bed system can achieve good softening effect on different industrial water.The system currently uses NaOH,Na_(2)CO_(3)and other alkaline agents as softeners.In this paper,CO_(2)was used as softening agent,and it was used in the chemical crystallization and granulation method together with NaOH to carry out static test.The application effect of this technology was studied by controlling the dosage ratio of the chemical agent,reaction temperature,reaction pressure.The test results showed that when the test pressure was 2.5 kg/m2,the water temperature was 20℃,and the dosages of CO_(2)and NaOH were 3.5 mmol/L and 2.5 mmol/L,respectively,the removal rate of Ca^(2+) in water was 85.0%,and the removal rate of total hardness was 74.0%.Compared with the softening agents currently used in production,the combined softening treatment of CO_(2)and NaOH has the advantages of easy control of effluent pH,high water quality stability,convenient operation and low operating cost.

关 键 词：CO_(2) 资源化 水质软化 化学结晶造粒法 高永久性硬度 双碱法 

分 类 号：X703[环境科学与工程—环境工程]