再生液添加NaHCO<sub>3</sub>对硝酸盐选择性去除工艺的影响

段守鹏; 郑少奎

doi:10.13205/j.hjgc.202011012

再生液添加NaHCO₃对硝酸盐选择性去除工艺的影响

doi: 10.13205/j.hjgc.202011012

段守鹏,
郑少奎^,

北京师范大学环境学院水沙科学教育部重点实验室/水环境模拟国家重点实验室, 北京 100875

基金项目:

国家自然科学基金（21677016；51878050；91547207；U1806217）；国家重点研发专项（2018YFC1406404）。

详细信息

作者简介:
段守鹏(1996-),男,硕士研究生,主要研究方向为废水处理新技术。201411181001@mail.bnu.edu.cn

通讯作者:
郑少奎(1973-),男,博士,教授,主要研究方向为水和废水处理技术。zsk@bnu.edu.cn

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- 文章访问数: 152
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- 被引次数: 0
出版历程
- 收稿日期: 2020-03-04
- 网络出版日期: 2021-04-23
- 刊出日期: 2021-04-23

EFFECT OF NAHCO₃ ADDITION INTO NaCl REGENERANT ON NITRATE-SELECTIVE ION EXCHANGE REMOVAL PROCESS

DUAN Shou-peng,
ZHENG Shao-kui^,

MOE Key Laboratory of Water and Sediment Sciences&State Key Lab of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China

摘要

摘要: 在NaCl再生液中添加pH缓冲剂NaHCO₃，重点调查了添加NaHCO₃对失效再生液电解效果和地下水硝酸盐选择性离子交换-再生-失效再生液电解工艺长期运行稳定性的影响。结果表明：在6 g/L NaCl再生液中添加10 g/L NaHCO₃后，电解8 h硝酸盐的去除率达到96%，溶液pH值变化较小，硝酸盐去除效果优于不调节pH或加稀盐酸调节pH，Fe阴极无显著腐蚀现象；再生液NaCl浓度从6 g/L提高到36 g/L，电解反应的硝酸盐去除率降低；地下水选择性离子交换-再生-失效再生液电解工艺长期运行过程中（13个工作循环），在6 g/L NaCl再生液中添加NaHCO₃对产水水质、树脂选择性、再生液洗脱能力和硝酸盐积累规律均无负面影响，产水水质稳定、优良。
- 地下水 /
- 硝酸盐 /
- 选择性离子交换 /
- 再生液 /
- 电化学
Abstract: The nitrate removal performance from spent brine by electrolysis was investigated, with 10 g/L NaHCO₃ added into 6 g/L NaCl regenerant as a pH buffer. Besides a stable pH level (8.3~9.1) during 8 h electrolysis of spent brine, there was a higher nitrate removal efficiency (i.e., 96%) achieved by the addition of NaHCO₃ than those achieved by the addition of diluted HCl solution and even without pH adjustment. The addition of NaHCO₃ also protected Fe cathodic plate from attacks of aggressive ions (e.g., chloride) in regenerant. The increase in NaCl concentration in regenerant from 6 g/L to 36 g/L led to a remarkable decrease in nitrate removal by 20%. Subsequently, this study investigated the long-term operation performance (i.e., 13 cycles) of the nitrate-selective ion exchange-regeneration-spent brine electrolysis process for nitrate-ridden groundwater treatment, with the addition of 10 g/L NaHCO₃ into 6 g/L NaCl regenerant. There were no side effect on product water quality, resin nitrate selectivity, regenerant elution capacity, and nitrate accumulation characteristics in regenerant observed after the addition of NaHCO₃. Nitrate concentration in product water stably met the required water quality standards for drinking water throughout the experimental periods.
- groundwater /
- nitrate /
- selective ion exchange /
- regenerant /
- electroreduction

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