碳酸氢铵为汲取液正渗透海水淡化研究

doi:10.16085/j.issn.1000-6613.2017.06.012

化工进展 ›› 2017, Vol. 36 ›› Issue (06): 2051-2056.DOI: 10.16085/j.issn.1000-6613.2017.06.012

碳酸氢铵为汲取液正渗透海水淡化研究

高婷婷¹, 解利昕¹, 徐世昌¹, 冯丽媛¹, 杜亚威², 周晓凯¹

1 天津大学化工学院, 天津市膜科学与海水淡化技术重点实验室, 天津 300354;
2 河北工业大学海洋科学与工程学院, 海水资源高效利用化工技术教育部工程研究中心, 天津 300130

收稿日期:2017-01-17 修回日期:2017-04-10 出版日期:2017-06-05 发布日期:2017-06-05
通讯作者: 解利昕
作者简介:高婷婷(1991—),女,硕士研究生,研究方向为化学工程。
基金资助:
国家科技支撑计划（2015BAB10B01，2014BAB04B01）、国家重点研发计划（2016YFC0401200）及国家自然科学基金（21606067）项目。

Study on seawater desalination by ammonium bicarbonate forward osmosis process

GAO Tingting¹, XIE Lixin¹, XU Shichang¹, FENG Liyuan¹, DU Yawei², ZHOU Xiaokai¹

1 Tianjin Key Laboratory of Membrane Science and Desalination Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China;
2 Engineering Research Center of Seawater Utilization Technology of Ministry of Education, School of Marine Science and Engineering, Hebei University of Technology, Tianjin 300130, China

Received:2017-01-17 Revised:2017-04-10 Online:2017-06-05 Published:2017-06-05

摘要/Abstract

摘要： 正渗透技术因低能耗、低膜污染和高回收率等优点逐渐成为膜分离技术的研究热点。本文以碳酸氢铵溶液为汲取液、0.6mol/L氯化钠溶液为模拟海水进行了正渗透实验，研究了不同操作条件下正渗透水通量的变化规律和汲取液部分解吸-吸收过程中氨解吸率、氨吸收率以及解吸能耗的变化。结果表明，提高进料流量和汲取液浓度，正渗透过程水通量增加；提高吸收塔进料流量，氨吸收率增加，操作条件对氨解吸率影响较小；海水淡化正渗透系统能耗主要用于汲取液解吸过程，降低解吸塔进料浓度可以降低解吸过程的能量消耗。在优化的工艺条件下，正渗透过程水通量为13.6L/（m²·h），汲取液回收利用率达到99%，海水淡化产水总溶解固体（TDS）不高于1000mg/L，系统吨水耗电量约为195kW·h。实验结果对正渗透过程的工业化应用具有指导意义。

关键词: 正渗透, 脱盐, 碳酸氢铵, 解吸, 吸收

Abstract: Forward osmosis(FO)is becoming one of the hot spots in the field of membrane technology due to low fouling,low energy consumption and high water recovery. In the present work,forward osmosis for seawater desalination was carried out by using ammonium bicarbonate(NH₄HCO₃)solution as draw solution and 0.6mol/L sodium chloride(NaCl)solution as simulated seawater,followed by NH₄HCO₃ recovery through partial desorption/absorption. A series of experiments were conducted to investigate the effect of operating conditions on water flux,ammonia absorption rate,ammonia desorption rate and specific energy consumption. The results indicated that the water flux of FO system increased with increasing draw solution concentration,flowrate of draw solution or feed solution. Ammonia absorption rate of the absorption column increased with the increase of draw solution flowrate. The operating conditions had little influence on the ammonia desorption rate in the desorption column. In addition,the energy consumption of FO desalination system was mainly utilized in the draw solution desorption process. Thus,decreasing the inlet draw solution concentration of desorption column could reduce the specific energy consumption. Under optimal experimental conditions,the total specific energy consumption was about 195kW·h/m³ of product water. The water flux of FO system was around 13.6L/(m²·h),and NH₄HCO₃ reclamation rate was 99% with total dissolved solids(TDS)of product water below 1000mg/L. These results provide guidance for further industrial applications of forward osmosis process.

Key words: forward osmosis, desalination, ammonium bicarbonate, desorption, absorption

中图分类号:

P747⁺.6

高婷婷, 解利昕, 徐世昌, 冯丽媛, 杜亚威, 周晓凯. 碳酸氢铵为汲取液正渗透海水淡化研究[J]. 化工进展, 2017, 36(06): 2051-2056.

GAO Tingting, XIE Lixin, XU Shichang, FENG Liyuan, DU Yawei, ZHOU Xiaokai. Study on seawater desalination by ammonium bicarbonate forward osmosis process[J]. Chemical Industry and Engineering Progress, 2017, 36(06): 2051-2056.

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碳酸氢铵为汲取液正渗透海水淡化研究

Study on seawater desalination by ammonium bicarbonate forward osmosis process

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