含钼废水处理及饮用水应急处理技术及工艺

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含钼废水处理及饮用水应急处理技术及工艺

林朋飞,张晓健(

),陈超,汪隽

Treatment of molybdenum-containing wastewater and drinking water

Pengfei LIN,Xiaojian ZHANG(

),Chao CHEN,Jun WANG

Division of Drinking Water Safety, School of Environment, Tsinghua University, Beijing 100084, China

摘要:

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文章导读

摘要在弱酸性条件下氢氧化铁沉淀物对钼酸根离子具有吸附作用,本文研究弱酸性铁盐混凝沉淀过滤工艺对含钼废水及水源钼污染的饮用水应急处理效果。通过调节原水pH值,研究pH对铁盐除钼效果的影响。在最适pH条件下,通过投加不同混凝剂,研究铁盐对钼的去除规律,探讨去除原理。结果显示在弱酸性条件下,铁盐混凝沉淀法除钼是表面电化学吸附过程,符合Langmuir吸附等温线方程。pH是重要工艺参数,最佳pH范围为4~4.5。弱酸性铁盐混凝沉淀过滤工艺可以与水厂常规处理工艺结合,有效应对原水微量钼超标问题,保障供水安全。采用该工艺处理高浓度含钼废水时,在最适pH条件下,投加适当铁盐混凝剂,一级混凝沉淀出水可以满足废水排放标准要求,但难以满足地表水水环境质量要求。为满足地表水环境质量标准要求,可采用二级混凝沉淀串联处理。该工艺除钼所需构筑物简单,药剂投量有限。

关键词 ：废水处理,钼,铁盐混凝,饮用水安全

Abstract：Weak acidic iron coagulation sedimentation and filtration were used to treat molybdenum containing wastewater and drinking water. The solution pH was adjusted to study the influence of pH on molybdenum removal. The rule of iron coagulant to remove molybdenum use various pH and iron concentrations to study the removal efficiency. The results show that the molybdenum removal mechanism is a surface electrochemical adsorption process that could be fit by a Langmuir adsorption isotherm. The solution pH controls the process and the optimum pH ranges from 4.0 to 4.5. This process, which can be combined with conventional water plant treatments, can protect drinking water safety when the raw water contains trace molybdenum pollution. The molybdenum concentration of the effluent water will exceed the standards using only process for high concentration wastewater. Thus, secondary treatment is needed because there is equilibrium between the adsorption capacity and the effluent concentration. This process can be conducted in a simple treatment structure with limited coagulant dosage.

Key words：wastewater treatments molybdenum iron coagulation drinking water safety

收稿日期: 2013-08-14 出版日期: 2015-09-03

ZTFLH:

基金资助:国家水体污染控制与治理科技重大专项 (2008ZX07420-005)

引用本文:

林朋飞, 张晓健, 陈超, 汪隽. 含钼废水处理及饮用水应急处理技术及工艺[J]. 清华大学学报（自然科学版）, 2014, 54(5): 613-618.
Pengfei LIN, Xiaojian ZHANG, Chao CHEN, Jun WANG. Treatment of molybdenum-containing wastewater and drinking water. Journal of Tsinghua University(Science and Technology), 2014, 54(5): 613-618.

链接本文:

http://jst.tsinghuajournals.com/CN/或 http://jst.tsinghuajournals.com/CN/Y2014/V54/I5/613

图表:

不同混凝剂和pH除钼效果(钼初始质量浓度: 0.35 mg/L; 混凝剂质量浓度: 5 mg/L)

不同pH对铁盐混凝剂除钼效果的影响(钼初始质量浓度: 19.93 mg/L; 混凝剂质量浓度: 30 mg/L)

组序	pH	C_Fe	C_e-Mo	qe-Mo*
组序	pH	mg·L^-1	mg·L^-1	mg·mg^-1
1	4.86	5	14.67	1.05
2	4.12	10	9.23	1.07
3	3.43	20	4.53	0.77
4	3.26	25	3.60	0.65
5	3.17	30	3.15	0.56
6	3.03	40	3.15	0.42
7	4.25	30	0.574	0.65

钼吸附量同平衡浓度关系

铁盐混凝除钼吸附等温线

二级铁盐混凝沉淀过滤工艺除钼效果

弱酸性铁盐混凝沉淀法除钼水厂工艺流程图

二级弱酸性铁盐混凝沉淀过滤工艺处理含钼废水流程图

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