Zhang Xiaozhuan, Zhao Kejiang, Shi Xibao, Tian Zhenbang, Huang Zuohua, Zhao Liang
Henan International Joint Lab of Key Technology in Water Treatment, Key Laboratory of Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, School of Environments, Henan Normal University, Xinxiang, Henan, China.
Henan Institute of Chemistry, Henan Academy of Sciences, Zhengzhou, Henan, China.
Front Chem. 2022 Oct 24;10:1036726. doi: 10.3389/fchem.2022.1036726. eCollection 2022.
In gold-smelting wastewater after the original treatment process of flocculation and precipitation using mainly lime, a mixture of As, Cu, Pb, Mn, Zn, Al, Ni, and Fe existed with an arsenic concentration of 813.07 mg/L and other ions' concentration at ug/L levels. In this work, a new clean process of mainly adsorption with self-made adsorbent Fe-PE, which was synthesized by loading ferric lignin on agricultural mulch film residual, was investigated to purify and remove arsenic from gold-smelting wastewater. A batch of column experiments was investigated to explore the reaction behavior between wastewater and adsorbent Fe-PE. The results showed while operating the adsorption columns at a pilot scale for 68 days, the arsenic concentration in the effluent was below 0.5 mg/L, and there was no significant change in the concentration of co-existing metal ions, indicating that Fe-PE had a good selective adsorption performance for arsenic in wastewater. Furthermore, Fe-PE did not dissolve and release Fe ions in wastewater, and the whole process could not produce sludge. This work first suggested an efficient and potential application for the purification and removal of arsenic from gold-smelting wastewater with agricultural mulch film residual after chemical modification, which will provide a novel strategy for reusing the agricultural mulch film residual.
在主要使用石灰进行絮凝沉淀的原处理工艺后的黄金冶炼废水中，存在砷、铜、铅、锰、锌、铝、镍和铁的混合物，砷浓度为813.07mg/L，其他离子浓度处于微克/升水平。在这项工作中，研究了一种新的清洁工艺，主要使用自制吸附剂Fe-PE进行吸附，该吸附剂是通过将木质素铁负载在农用薄膜残渣上合成的，用于净化和去除黄金冶炼废水中的砷。进行了一批柱实验，以探索废水与吸附剂Fe-PE之间的反应行为。结果表明，在中试规模下运行吸附柱68天，出水砷浓度低于0.5mg/L，共存金属离子浓度无显著变化，表明Fe-PE对废水中的砷具有良好的选择性吸附性能。此外，Fe-PE在废水中不会溶解并释放铁离子，整个过程不会产生污泥。这项工作首次提出了一种高效且有潜力的应用，即通过化学改性后的农用薄膜残渣净化和去除黄金冶炼废水中的砷，这将为农用薄膜残渣的再利用提供一种新策略。
