Kinetic studies of phosphate adsorption onto construction solid waste (CSW)

IF 2 Q3 Environmental Science

Water Quality Research Journal of Canada Pub Date : 2014-11-01 DOI:10.2166/WQRJC.2014.013

C. Liu, Y. Yang, N. Wan

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引用次数: 7

Abstract

Adsorption of phosphate onto construction solid waste (CSW) was investigated in a batch system. CSW as an inescapable by-product of the construction and demolition process, was used as a composite adsorbent for the removal of phosphate in this study. The adsorption kinetics was investigated under various parameters such as contact time, pH, CSW dosage, initial phosphate concentration and particle size. Greater percentage of phosphate was removed with decrease in the initial concentration and increase in the amount of CSW used. Adsorption of phosphate was pH dependent, and maximum phosphate immobilisation capacity was obtained in alkaline condition. Lagergren ﬁrst-order, second-order, intra-particle diffusion and external diffusion model were used to test the experimental data. Kinetic analysis showed that the adsorption was best ﬁtted with the pseudo-second-order kinetic model. Adsorption mechanism studies revealed that both external mass transfer and intra-particle diffusion had rate limiting effects on the removal process. These results demonstrated that the CSW could be used as a low-cost adsorbent media for phosphate removal, and the data were relevant for optimal design of wastewater treatment plants.

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建筑固体废物(CSW)吸附磷酸盐的动力学研究

研究了磷酸盐在建筑固体废物(CSW)上的吸附。CSW是建筑和拆除过程中不可避免的副产品，本研究将其作为复合吸附剂用于磷酸盐的去除。考察了接触时间、pH、CSW投加量、初始磷酸盐浓度和粒径对吸附动力学的影响。随着初始浓度的降低和CSW用量的增加，磷酸盐的去除率提高。对磷酸盐的吸附与pH有关，在碱性条件下固定化磷酸盐的能力最大。采用Lagergren一阶、二阶、粒子内扩散和粒子外扩散模型对实验数据进行检验。动力学分析表明，吸附最符合准二级动力学模型。吸附机理研究表明，外部传质和颗粒内扩散对去除过程都有速率限制作用。这些结果表明，CSW可以作为一种低成本的除磷吸附介质，并为污水处理厂的优化设计提供了相关数据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Quality Research Journal of Canada WATER RESOURCES-

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Water Quality Research Journal publishes peer-reviewed, scholarly articles on the following general subject areas: Impact of current and emerging contaminants on aquatic ecosystems Aquatic ecology (ecohydrology and ecohydraulics, invasive species, biodiversity, and aquatic species at risk) Conservation and protection of aquatic environments Responsible resource development and water quality (mining, forestry, hydropower, oil and gas) Drinking water, wastewater and stormwater treatment technologies and strategies Impacts and solutions of diffuse pollution (urban and agricultural run-off) on water quality Industrial water quality Used water: Reuse and resource recovery Groundwater quality (management, remediation, fracking, legacy contaminants) Assessment of surface and subsurface water quality Regulations, economics, strategies and policies related to water quality Social science issues in relation to water quality Water quality in remote areas Water quality in cold climates The Water Quality Research Journal is a quarterly publication. It is a forum for original research dealing with the aquatic environment, and should report new and significant findings that advance the understanding of the field. Critical review articles are especially encouraged.