周师帅^1,,
顾平¹,
刘阳¹,
何利斌¹,
张光辉^1,,
董丽华¹,
袁艳林¹
1.天津大学环境科学与工程学院，天津 300350
基金项目: 国家水体污染控制与治理科技重大专项2015ZX07406006国家水体污染控制与治理科技重大专项(2015ZX07406006)

Iodide removal from the simulated radioactive wastewater by predeoxygenation-precipitation-column membrane separation combined process

ZHOU Shishuai^1,,
GU Ping¹,
LIU Yang¹,
HE Libin¹,
ZHANG Guanghui^1,,
DONG Lihua¹,
YUAN Yanlin¹
1.School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China

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摘要:为了优化沉淀-微滤组合除碘工艺，开发预除氧-沉淀-柱式膜分离组合工艺处理模拟含碘放射性废水，考察了小试实验的除碘效果、出水水质及连续出水、间歇出水模式的柱式膜污染情况。结果表明：使用Na2SO3作除氧剂、Cu2+作催化剂对原水进行预除氧，投加量分别为150 mg·L-1和1 mg·L-1；沉淀剂CuCl投加量为100 mg·L-1。实验装置连续运行216 h，累积处理水量为2 160 L，运行稳定后，I-平均去除率为93.9%，出水水质较稳定，出水Cu2+须进行后续处理。产生污泥的体积较小，浓缩倍数为8 640。间歇出水模式有利于减缓膜污染，柱式膜的最终膜比通量降至初始膜比通量的47%。与沉淀-微滤工艺相比，预除氧-沉淀-柱式膜分离组合工艺装置简单，运行成本降低。
关键词: 放射性废水处理/
碘离子污染废水/
化学沉淀法/
柱式膜分离/
膜污染

Abstract:In order to optimize the precipitation-microfiltration combined process for iodide removal, a predeoxygenation-precipitation-column membrane separation combined process was developed for iodide removal from the simulated radioactive wastewater. The laboratory scale experiments were conducted to study I- removal efficiency, effluent water quality and column membrane fouling under continuous and intermittent effluent drawing models. The results showed that raw water could be pre-deoxidized by a deoxidizer of Na2SO3 and a catalyst of Cu2+ with doses of 150 mg·L-1 and 1 mg·L-1, respectively. CuCl was used as precipitant and its dosage was 100 mg·L-1. The experimental device continued to run for 216 h, and cumulative treated water volume reached 2 160 L. At a stable operation stage, the average I- removal efficiency was 93.9% and the effluent quality maintained stable, while Cu2+ in the effluent needs to be treated subsequently. This process produced a small amount of sludge with a concentration factor of 8 640. Intermittent effluent drawing model was beneficial to retard the membrane fouling. The final specific membrane flux of the column membrane decreased to 47% of the initial value. Compared with the precipitation-microfiltration process, the predeoxygenation-precipitation-column membrane separation combined process has simpler device and lower operation cost.
Key words:radioactive wastewater treatment/
iodide contaminated wastewater/
chemical precipitation/
column membrane separation/
membrane fouling.

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预除氧-沉淀-柱式膜分离组合工艺处理模拟含碘放射性废水

周师帅^1,,
顾平¹,
刘阳¹,
何利斌¹,
张光辉^1,,
董丽华¹,
袁艳林¹
1.天津大学环境科学与工程学院，天津 300350
基金项目: 国家水体污染控制与治理科技重大专项2015ZX07406006国家水体污染控制与治理科技重大专项(2015ZX07406006)
关键词: 放射性废水处理/
碘离子污染废水/
化学沉淀法/
柱式膜分离/
膜污染
摘要:为了优化沉淀-微滤组合除碘工艺，开发预除氧-沉淀-柱式膜分离组合工艺处理模拟含碘放射性废水，考察了小试实验的除碘效果、出水水质及连续出水、间歇出水模式的柱式膜污染情况。结果表明：使用Na2SO3作除氧剂、Cu2+作催化剂对原水进行预除氧，投加量分别为150 mg·L-1和1 mg·L-1；沉淀剂CuCl投加量为100 mg·L-1。实验装置连续运行216 h，累积处理水量为2 160 L，运行稳定后，I-平均去除率为93.9%，出水水质较稳定，出水Cu2+须进行后续处理。产生污泥的体积较小，浓缩倍数为8 640。间歇出水模式有利于减缓膜污染，柱式膜的最终膜比通量降至初始膜比通量的47%。与沉淀-微滤工艺相比，预除氧-沉淀-柱式膜分离组合工艺装置简单，运行成本降低。

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