通过污水污泥的可持续修复实现磷酸盐循环的闭合:用螯合亚氨基二乙酸树脂去除柠檬酸浸出液中的二价金属

IF 5.9 3区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY
Thomas J. Robshaw, James P. Bezzina, Robert Dawson, Mark D. Ogden
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引用次数: 0

摘要

全球迫切需要努力实现磷酸盐循环利用的闭环。一个可能的途径是研究用污水污泥代替商业肥料。这就需要去除其中有问题的重金属。本研究利用市售的螯合离子交换树脂(Purolite MTS9301)对柠檬酸浸出后的铜、铁(II)、铅和锌进行了研究。研究的主要参数包括柠檬酸浓度、平衡金属吸收率、动力学金属吸收率和水溶液中的种类(由 HySS 计算机程序预测)。平衡数据与一些常见的等温线模型进行了拟合,其中包括经过修改以考虑竞争体系中的解吸作用的朗缪尔模型。事实证明,该模型最能拟合数据,得出的多金属体系中铜、铅和锌的最大吸附容量分别为 1.81 ± 0.06、0.8 ± 0.1 和 0.44 ± 0.02 mmol g。动力学数据同样与广泛使用的模型进行了拟合,伪二阶(PSO)模型对数据的描述最为充分。计算得出,铜、铅和锌的吸附半衰期分别为 12.7 ± 0.7、32 ± 4 和 31 ± 2 分钟。由于铁(II)对树脂的亲和力非常低,因此无法对其数据进行可靠的建模。所有实验的选择性顺序都明确为 Cu > Pb ∼ Zn ∼ Fe。一般来说,在柠檬酸浸出液中,树脂的吸收量和吸收速度均优于在同等醋酸浸出液中的吸收量和吸收速度。此外,柠檬酸/锰酸锂的优点还包括所需的活性剂浓度更低、毒性更小、生产更可持续。总之,柠檬酸/ MTS9301 组合在管理污水污泥中的三种主要重金属方面表现出了相当大的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Towards phosphate loop closure by sustainable remediation of sewage sludge: Removal of divalent metals from citric acid leachate with a chelating iminodiacetic acid resin
There is an urgent global need to work toward closure of the phosphate recycling loop. One possible pathway is investigation of use of sewage sludge in lieu of commercial fertilisers. This necessitates removal of the problematic heavy metals therein. This study investigates abatement of copper, iron(II), lead and zinc, after leaching with citric acid, with a commercially-available chelating ion-exchange resin (Purolite MTS9301). Key parameters investigated include citric acid concentration, equilibrium metal uptake, kinetic metal uptake and aqueous speciation (predicted by the HySS computer programme). Equilibrium data were fitted to a number of common isotherm models, including a version of the Langmuir, modified to account for desorption in a competitive system. This model proved most capable of fitting the data and the derived maximal adsorption capacities in the multi-metal system were 1.81 ± 0.06, 0.8 ± 0.1 and 0.44 ± 0.02 mmol g for Cu, Pb and Zn respectively. Kinetic data were likewise fitted to widely-used models and the pseudo second-order (PSO) model most adequately described the data. The adsorption half-lives were calculated as 12.7 ± 0.7, 32 ± 4 and 31 ± 2 min for Cu, Pb and Zn. Fe(II) data could not be reliably modelled, due to the very low affinity for the resin. The order of selectivity across all experiments was clearly established as Cu > Pb ∼ Zn ≫ Fe. Generally, quantities and rapidity of uptake was superior in the citric acid leachate than for the same resin in the equivalent acetic acid leachate. Further advantages are lower required lixiviant concentration, reduced toxicity and more sustainable manufacture. Overall, the citric acid/ MTS9301 combination showed considerable potential in the management of three key heavy metals in sewage sludge.
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来源期刊
CiteScore
10.40
自引率
6.60%
发文量
639
审稿时长
29 days
期刊介绍: Journal of Industrial and Engineering Chemistry is published monthly in English by the Korean Society of Industrial and Engineering Chemistry. JIEC brings together multidisciplinary interests in one journal and is to disseminate information on all aspects of research and development in industrial and engineering chemistry. Contributions in the form of research articles, short communications, notes and reviews are considered for publication. The editors welcome original contributions that have not been and are not to be published elsewhere. Instruction to authors and a manuscript submissions form are printed at the end of each issue. Bulk reprints of individual articles can be ordered. This publication is partially supported by Korea Research Foundation and the Korean Federation of Science and Technology Societies.
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