混凝-沉淀法对二步湿法腈纶生产中NaSCN膜分离浓液的净化效果

刘建波; 张盼月; 曾光明; 田智勇; 宋永会

doi:10.3969/j.issn.1674-991X.2016.03.036

混凝-沉淀法对二步湿法腈纶生产中NaSCN膜分离浓液的净化效果

doi: 10.3969/j.issn.1674-991X.2016.03.036

刘建波^1,2,3,4,
张盼月^3,4,
曾光明^3,4,
田智勇^1,2*, ,,
宋永会^1,2

1.
环境基准与风险评估国家重点实验室,中国环境科学研究院
2.
中国环境科学研究院城市水环境科技创新基地
3.
湖南大学环境科学与工程学院
4.
湖南大学环境生物与控制教育部重点实验室

详细信息

通讯作者:
田智勇 E-mail: hkytzy2008@163.com

中图分类号: X703.1
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出版历程
- 收稿日期: 2015-11-18
- 修回日期: 2015-12-25
- 刊出日期: 2016-05-20

Purification Effect of Coagulation-sedimentation for NaSCN Concentrated Solution from Two-step Wet Production of Spun Acrylic Fiber

LIU Jianbo^1,2,3,4,
ZHANG Panyue^3,4,
ZENG Guangming^3,4,
TIAN Zhiyong^{1,2*
, ,},
SONG Yonghui^1,2

1.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences
2.
Scientific and Technological Innovation Base for Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences
3.
College of Environmental Science and Engineering, Hunan University
4.
Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education

More Information

Corresponding author: TIAN Zhiyong E-mail: hkytzy2008@163.com

摘要

摘要: 针对二步湿法腈纶生产过程中NaSCN溶液经纳滤膜分离净化后浓液的进一步净化和回收利用，采用混凝-沉淀法对NaSCN膜分离浓液的净化处理效果进行了试验，并研究和分析了聚合氯化铝（PAC）、聚丙烯酰胺（PAM）、石灰乳等不同投加量以及不同初始pH、搅拌强度对NaSCN膜分离浓液的净化影响。结果表明：当PAC、PAM、石灰乳投加量分别为200、2.5和25 mg/L，初始pH为7.5，搅拌转速为80 r/min，速度梯度（G）为48.9 s^-1，GT为58.7×10³时，浓水中浊度和COD去除率可达到最高值，分别为85%±2%、30%±5%；而此时SCN^-流失率仅为20%~25%，表明混凝-沉淀工艺能很好地去除NaSCN膜分离浓液中的杂质，使SCN^-回收效率达75%以上，适合用于该生产浓液净化过程的预处理。
- NaSCN /
- 膜分离 /
- 浓水 /
- 混凝
Abstract: To further purify and recycle the concentrated solution of NaSCN excreted from the nanofiltration membrane in the two-step wet production of acrylic fiber, the coagulation-sedimentation method was applied to the treatment of concentrated solution of NaSCN membrane separation. Different dosages of polyaluminium chloride (PAC), polyacrylamide (PAM), lime milk, etc., and variable initial pH, stirring intensity were tested to analyze the purification effect of concentrated solution of NaSCN membrane separation. The results showed: when the dosage of PAC, PAM, lime milk was 200, 2.5, 25 mg/L separately, initial pH was 7.5, stirring intensity was 80 r/min, velocity gradient (G) was 48.9 s^-1, GT was 58.7×10³, the turbidity and COD_Cr removal rates of the concentrated solution were 85%±2%, 30%±5%, respectively; the SCN^-turnover rate was only 20% under the above conditions, and the recovery rate of SCN^-was more than 75%. It showed that the method was suitable to the pretreatment of the concentrated solution.
- NaSCN /
- membrane separation /
- concentrated solution /
- coagulation