Research and pilot-scale demonstration of advanced treatment technology for antimony-containing wastewater

doi:10.19965/j.cnki.iwt.2023-0042

Abstract

Abstract:

The low concentration antimony-containing wastewater from an antimony product plant after coagulation and precipitation treatment was used as the adsorption object，and the optimal adsorption conditions were obtained by single-factor experiments. Then，the optimal process parameters of the magnetic separation technology for deep treatment were determined by dynamicized adsorption and regeneration experiments. The technology enabled the effluent antimony mass concentration to reach the discharge standard（5 μg/L） stably. The results of the experiments showed that the mass concentration of antimony was reduced to 0.004 mg/L under the conditions of iron-based Fenton-modified magnetic adsorbent（AFS350） dosing of 2.0 g/L，adsorption for 1.0 h and stirring speed of 200 r/min. The results of the pilot test showed that the removal rate of antimony after AFS350 dosing of 3 g/L，stirring speed of 300 r/min and adsorption for 2.0 h was up to 98.91%. This process technology achieves fully automatic separation and recovery and recycling of magnetic adsorption materials，and at the same time had high economic efficiency and sustainable development potential，providing a feasible solution for the deep treatment of industrial antimony-containing wastewater.

Key words: water treatment technology, magnetic adsorption material, antimony-containing wastewater

摘要：

以某锑制品厂混凝沉淀处理后的低浓度含锑废水为吸附对象，在小试中通过单因素实验得到最佳吸附条件，再通过动态化吸附和再生实验确定深度处理磁分离技术的最佳工艺参数。该技术使出水的锑质量浓度能稳定达到排放标准（5 μg/L）。小试结果表明，在铁基Fenton改性磁性吸附剂（AFS350）投加2.0 g/L，吸附1.0 h，搅拌速度200 r/min的条件下，出水锑的质量浓度降为0.004 mg/L。中试结果表明，AFS350投加3 g/L，搅拌速度300 r/min，吸附2.0 h后，锑的去除率高达98.91%。此工艺技术实现了磁性吸附材料全自动分离回收及再生利用，同时具有较高的经济效益和可持续发展的潜力，为工业含锑废水的深度处理提供了一种可行方案。

关键词: 水处理技术, 磁性吸附材料, 含锑废水

CLC Number:

X703

Tao CHEN, Guangyi FU, Yu ZHONG, Qionghua LI, Shiqiang TIAN, Yingxiang CHENG. Research and pilot-scale demonstration of advanced treatment technology for antimony-containing wastewater[J]. Industrial Water Treatment, 2023, 43(8): 179-184.

陈韬, 付广义, 钟宇, 李琼花, 田石强, 成应向. 含锑废水深度处理技术研究与中试示范[J]. 工业水处理, 2023, 43(8): 179-184.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-0042

https://www.iwt.cn/EN/Y2023/V43/I8/179

Figures/Tables 9

References 15

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名称	功率/kW	处理成本/（元·kg^-1）	备注
合计		1.029	电费按0.6元/（kW·h）计算
鼓风干燥箱	1.7	0.043	容积126 L
粉碎机	3	0.112	尺寸608 mm×600 mm×745 mm
球磨机	0.55	0.041	磨样量8 kg
管式炉	3	0.675	加热有效容积8 L
硫酸	—	0.018	稀释后对煅烧产物改性
恒温水浴锅	1.5	0.112	尺寸940 mm×170 mm×90 mm
真空干燥箱	1.5	0.028	尺寸715 mm×530 mm×1 200 mm

名称	功率/kW	处理成本/（元·kg^-1）	备注
合计		1.029	电费按0.6元/（kW·h）计算
鼓风干燥箱	1.7	0.043	容积126 L
粉碎机	3	0.112	尺寸608 mm×600 mm×745 mm
球磨机	0.55	0.041	磨样量8 kg
管式炉	3	0.675	加热有效容积8 L
硫酸	—	0.018	稀释后对煅烧产物改性
恒温水浴锅	1.5	0.112	尺寸940 mm×170 mm×90 mm
真空干燥箱	1.5	0.028	尺寸715 mm×530 mm×1 200 mm

技术难点	解决方法
吸附剂的选择	提出解决Fenton污泥有效处置的方法，贯彻“以废治废”的绿色环保理念，并实现再生利用是整个工艺技术的特色之一，所以采用铁基Fenton改性磁性吸附剂
磁分离工艺	吸附技术已有广泛的工程技术应用，基于节约资源降低成本的目的，只需要在场内搭建磁分离处理系统，经初步计算，结合规模效应以及磁性材料回收，磁分离工艺深度处理含锑废水成本有望低于1元/t，相较于其他深度处理工艺，具有一定的成本优势，可操作性强
吸附剂的再生性能	AFS350吸附剂再生后的吸附容量会受损，影响后续的锑去除率，运行过程中需添加新吸附剂与再生后的吸附剂混合使用。后续可以重点研究Fenton污泥改性后的磁性吸附剂本身的性能提升，优化再生条件，磁性吸附材料的回收可产生可观的经济效益

技术难点	解决方法
吸附剂的选择	提出解决Fenton污泥有效处置的方法，贯彻“以废治废”的绿色环保理念，并实现再生利用是整个工艺技术的特色之一，所以采用铁基Fenton改性磁性吸附剂
磁分离工艺	吸附技术已有广泛的工程技术应用，基于节约资源降低成本的目的，只需要在场内搭建磁分离处理系统，经初步计算，结合规模效应以及磁性材料回收，磁分离工艺深度处理含锑废水成本有望低于1元/t，相较于其他深度处理工艺，具有一定的成本优势，可操作性强
吸附剂的再生性能	AFS350吸附剂再生后的吸附容量会受损，影响后续的锑去除率，运行过程中需添加新吸附剂与再生后的吸附剂混合使用。后续可以重点研究Fenton污泥改性后的磁性吸附剂本身的性能提升，优化再生条件，磁性吸附材料的回收可产生可观的经济效益

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