Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic

doi:10.11949/0438-1157.20190454

Abstract

Abstract:

In the process of catalytic oxidation of Fe(Ⅱ) co-precipitated arsenic by hydrogen peroxide, different pH adjustments were used to adjust the pH of the solution. The effects of different pH adjustments on the precipitation of arsenic in wastewater and the properties of precipitated slag were studied. The results show that the pH adjustments of Na₂CO₃ and CaO are beneficial to the removal of arsenic from wastewater, and the arsenic in the coprecipitates is mainly in the form of amorphous bulk particles. When Na₂CO₃ is used as the pH adjustment, it is most favorable to the growth of particle size, the size of precipitates is the largest, but the stability of arsenic is the worst, and it is easier to release from the slag. The particle size of the precipitates obtained by CaO is relatively small due to the existence of CaSO₄ rod-like particles, but the existence form of arsenic is the most stable, and the fixation effect of arsenic is the best.

Key words: arsenic, wastewater, immobilization, pH adjustment, leaching toxicity, environment

摘要：

双氧水催化氧化Fe（Ⅱ）共沉淀砷的过程中，采用不同的pH调整剂调节溶液的pH，研究了不同的pH调整剂对废水中砷沉淀效果及沉淀渣性质的影响。结果表明：采用Na₂CO₃和CaO作为pH调整剂时有利于废水中砷的脱除，生成的共沉淀渣中砷主要是以无定形的非晶态块状颗粒形式存在的；使用Na₂CO₃作为pH调整剂时最有利于沉淀渣颗粒的长大，所得沉淀渣粒径最大，但是砷渣的稳定性最差，更容易从渣中释放出砷；采用CaO获得的沉淀渣中由于CaSO₄棒状颗粒的存在，渣的粒径相对较小，但砷的存在形式最为稳定，固砷效果最好。

关键词: 砷, 废水, 固定化, pH调整剂, 浸出毒性, 环境

CLC Number:

X 75

Yongliang WANG, Xiaoling YANG, Yongxia DONG, Yingchao DU, Xiang LIU, Peiwei HAN, Shufeng YE. Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic[J]. CIESC Journal, 2019, 70(9): 3511-3516.

王永良, 杨晓玲, 董永霞, 杜英超, 刘翔, 韩培伟, 叶树峰. pH调整剂对含砷酸性废水中氧化Fe（Ⅱ）共沉淀固砷行为的影响[J]. 化工学报, 2019, 70(9): 3511-3516.

Figures/Tables 6

Table 1 Concentrations of Fe and As after arsenic coprecipitation by different pH adjustments/(mg/L)

pH调整剂	H₂O₂∶As=1		H₂O₂∶As=2		H₂O₂∶As=3
pH调整剂	Fe	As	Fe	As	Fe	As
NH₃·H₂O	8347	7.15	6600	2.90	5700	1.95
NaOH	7750	6.40	6650	2.65	5500	1.30
Na₂CO₃	8030	3.60	6900	2.50	5850	1.15
CaO	7900	4.60	6800	3.00	5300	1.50

Table 2 Leaching toxicity of arsenic precipitates obtained by different pH adjustments/(mg/L)

H₂O₂∶As	NH₃·H₂O	NaOH	Na₂CO₃	CaO
1	13.01	10.53	10.01	9.89
2	3.28	3.56	4.12	3.21
3	1.59	1.64	2.16	0.76

Fig.1 Particle size distribution of precipitates

Fig.2 XRD results of precipitates

Fig.3 Infrared analysis results of precipitates

Fig.4 SEM results of precipitates

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