EFFECT OF TWO COVERING AGENTS ON PASSIVATION OF SIMULATED ARSENIC CONTAMINATED SEDIMENTS BY MICROSCALE TECHNIQUES

YAN Wenming; JIANG Chao; CHEN Xiang; MA Lin; YAN Binglong; HE Xiangyu; LI Minjuan; TIAN Fen; WU Tingfeng

doi:10.13205/j.hjgc.202211018

Volume 40 Issue 11

Nov. 2022

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YAN Wenming, JIANG Chao, CHEN Xiang, MA Lin, YAN Binglong, HE Xiangyu, LI Minjuan, TIAN Fen, WU Tingfeng. EFFECT OF TWO COVERING AGENTS ON PASSIVATION OF SIMULATED ARSENIC CONTAMINATED SEDIMENTS BY MICROSCALE TECHNIQUES[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 127-133,151. doi: 10.13205/j.hjgc.202211018

Citation:

YAN Wenming, JIANG Chao, CHEN Xiang, MA Lin, YAN Binglong, HE Xiangyu, LI Minjuan, TIAN Fen, WU Tingfeng. EFFECT OF TWO COVERING AGENTS ON PASSIVATION OF SIMULATED ARSENIC CONTAMINATED SEDIMENTS BY MICROSCALE TECHNIQUES[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 127-133,151. doi: 10.13205/j.hjgc.202211018

Citation:

YAN Wenming, JIANG Chao, CHEN Xiang, MA Lin, YAN Binglong, HE Xiangyu, LI Minjuan, TIAN Fen, WU Tingfeng. EFFECT OF TWO COVERING AGENTS ON PASSIVATION OF SIMULATED ARSENIC CONTAMINATED SEDIMENTS BY MICROSCALE TECHNIQUES[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 127-133,151. doi: 10.13205/j.hjgc.202211018

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EFFECT OF TWO COVERING AGENTS ON PASSIVATION OF SIMULATED ARSENIC CONTAMINATED SEDIMENTS BY MICROSCALE TECHNIQUES

doi: 10.13205/j.hjgc.202211018

1. State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;
2. Hunan Provincial Water Resources Department, Changsha 410007, China;
3. Lianyungang Water Resources Planning and Design Institute Co. Ltd, Lianyungang 222006, China;
4. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China

Received Date: 2021-11-03
Available Online: 2023-03-24

Abstract

Abstract

Laboratory-based incubation experiments were carried out to study the effectiveness of readily available materials on the deactivation of sediment arsenic (As) using micro-electrode technology and micro-interface analysis technology (e.g. HR-Peeper). Group experiments (i.e. lanthanum modified bentonite group (LMB) and oxygenate group (CaO₂+CaCO₃)) were carried out to test the reduction of the dissolved As in sediment interstitial water via adding LMB or CaO₂+CaCO₃ to the sediments after 4, 30, 90, and 150 day, and compared with control group. The results showed that both LMB and oxygenate could effectively decrease As pollution in sediments. The addition of LMB caused 50.86% reduction in the dissolved As content in sediment interstitial water with the influencing depth of -100 mm and duration of 150 d, while the addition of CaO₂+CaCO₃ caused 55.52% reduction in the dissolved As content in sediment interstitial water with the influencing depth of -100 mm and duration of 90 d. Both additions could dramatically decrease the internal dissolved As release. This could be explained by that the lanthanum ion on LMB had a strong affinity for arsenate and could remove the arsenate from sediment interstitial water. Moreover, the addition of LMB or oxygenate increased the Eh value of the sediments, and further led to the absorption of As by Fe (Ⅲ) oxidized from Fe (Ⅱ). Dissolved As contents along the sediment profile had a positive correlation with Fe (Ⅱ) contents (P<0.001). This study could be helpful for As pollution control in sediment in freshwater ecosystems.
- LMB,
- oxygenate,
- HR-Peeper,
- cover,
- arsenic

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References(47)

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