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Pap S, Kirk C, Bremner B, Turk Sekulic M, Shearer L, Gibb SW, Taggart MA. Reply to comments on "Low-cost chitosan-calcite adsorbent development for potential phosphate removal and recovery from wastewater effluent" by Pap et al. [Water research 173 (2020) 115573]. Water Res 2020; 179:115828. [PMID: 32446619 DOI: 10.1016/j.watres.2020.115828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 04/11/2020] [Indexed: 06/11/2023]
Abstract
This letter is in response to the comments of Dr Hu and Dr Zhang on "Low-cost chitosan-calcite adsorbent development for potential phosphate removal and recovery from wastewater effluent" (Pap et al., 2020). We thank Dr Hu and Dr Zhang for their interest and comments, and having reflected, we wish to provide some clarification.
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Affiliation(s)
- Sabolc Pap
- Environmental Research Institute, North Highland College, University of the Highlands and Islands, Thurso, Caithness, Scotland, KW14 7JD, UK; University of Novi Sad, Faculty of Technical Sciences, Department of Environmental Engineering and Occupational Safety and Health, Trg Dositeja Obradovića 6, 21 000, Novi Sad, Serbia.
| | - Caroline Kirk
- School of Chemistry, University of Edinburgh, David Brewster Rd, Edinburgh, EH9 3FJ, UK
| | - Barbara Bremner
- Environmental Research Institute, North Highland College, University of the Highlands and Islands, Thurso, Caithness, Scotland, KW14 7JD, UK
| | - Maja Turk Sekulic
- University of Novi Sad, Faculty of Technical Sciences, Department of Environmental Engineering and Occupational Safety and Health, Trg Dositeja Obradovića 6, 21 000, Novi Sad, Serbia
| | - Lisa Shearer
- Environmental Research Institute, North Highland College, University of the Highlands and Islands, Thurso, Caithness, Scotland, KW14 7JD, UK
| | - Stuart W Gibb
- Environmental Research Institute, North Highland College, University of the Highlands and Islands, Thurso, Caithness, Scotland, KW14 7JD, UK
| | - Mark A Taggart
- Environmental Research Institute, North Highland College, University of the Highlands and Islands, Thurso, Caithness, Scotland, KW14 7JD, UK
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Hu Q, Zhang Z. Comment on ″Low-cost chitosan-calcite adsorbent development for potential phosphate removal and recovery from wastewater effluent″. Water Res 2020; 179:115728. [PMID: 32359772 DOI: 10.1016/j.watres.2020.115728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/04/2020] [Accepted: 03/15/2020] [Indexed: 06/11/2023]
Abstract
In the adsorption studies, the accurate estimation of the model parameters contributes to getting insights into adsorption behaviors and optimizing adsorber design. After reading the research work of Pap et al. (2020) carefully, it was found that the fitting results were questionable. Thus, this comment tried to address the following aspects: (i) Correction of the fitting results for the kinetic and isotherm models; (ii) Correct form of the Bohart-Adams model; (iii) Usage of the Clark model; and (iv) Effects of the partial or complete experimental data on the model parameters. This work is expected to help readers better understand the adsorption models and estimate the model parameters.
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Affiliation(s)
- Qili Hu
- College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, China; Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki, 305-8572, Japan.
| | - Zhenya Zhang
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki, 305-8572, Japan
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Hu Q, Zhang Z. Comment on ″Exponential and logistic functions: The two faces of the Bohart-Adams model″. J Hazard Mater 2020; 394:122508. [PMID: 32248027 DOI: 10.1016/j.jhazmat.2020.122508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 02/20/2020] [Accepted: 03/08/2020] [Indexed: 06/11/2023]
Abstract
The Bohart-Adams model has been one of the most widely used breakthrough models for the modeling of dynamic adsorption behaviors of water pollutants in a fixed-bed column. However, the fitting quality was often questioned by many researchers when the Bohart-Adams model was correlated with the experimental data. Recently, Chu (2020) discussed the two simplified forms of the Bohart-Adams model and tested their applicability. In fact, in our previous study (Hu et al., 2019), it has been proved that the two forms represented the logistic and exponential functions in mathematical nature, respectively. The fitting quality depended on whether the experimental data approached the shape of the model curve. Besides, the curve characteristics and fitting ability of the original Bohart-Adams model were not revealed, and how to analyze asymmetrical breakthrough curve remained to be solved. This comment tried to expound the Bohart-Adams model completely. The authors hope that this work will be helpful for readers who are interested in the adsorption studies.
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Affiliation(s)
- Qili Hu
- College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China; Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan.
| | - Zhenya Zhang
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan
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