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Sustainability
Volume 14
Issue 20
10.3390/su142013535
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Article
Peer-Review Record

Waste Heat Driven Integrated Membrane Distillation for Concentrating Nutrients and Process Water Recovery at a Thermophilic Biogas Plant

Sustainability 2022, 14(20), 13535; https://doi.org/10.3390/su142013535
by Ershad Ullah Khan 1,*, Åke Nordberg 2 and Peter Malmros 3
Reviewer 1: Anonymous
Reviewer 2:
Younghan Yoon
Sustainability 2022, 14(20), 13535; https://doi.org/10.3390/su142013535
Submission received: 2 September 2022 / Revised: 14 October 2022 / Accepted: 17 October 2022 / Published: 19 October 2022
(This article belongs to the Special Issue Wastewater Treatment and Sustainability of Development)

Round 1

Reviewer 1 Report

The study analyzed the cost and performance of waste heat-driven integrated membrane distillation for the treatment of digestate liquid to recycle process water, recover low-grade waste heat, and concentrate the nutrients for bio-fertilizer use. The manuscript is well-written and outlined.

This is a good paper that can be accepted.

Author Response

We would like to thank the reviewer for providing valuable feedback which has allowed us to improve the quality of the manuscript.

Reviewer 2 Report

Just check the attached file.

Comments for author File: Comments.pdf

Author Response

Please see the attachment.

Author Response File: Author Response.doc

Reviewer 3 Report

1.   The last sentence of abstract “ Nevertheless, the economic assessment indicated that thermal integration of a biogas plant with industrial-scale MD digestate treatment capacity could be economically feasible, with winter being more economically favorable due to higher waste heat recovery” shows that economic analysis is under discussion, and first sentence of aims and objective is also “The overall objective of the study was to assess the techno-economic performance of digestate separation and concentration at a full-scale thermophilic biogas plant integrated with MD technology”. Please mention whether it can be challenging in which situation of energy mix and if some countries can adopt as economical due to their own reserves, please explain accordingly.



2. the topic is upto the mark and has potential to be explored more. The life cycle of this pilot setup can be added if possible.



3. It is mainly to add economic analysis and use of waste heat why heat exchanger, however, only one type of heat exchanger is used. Reason should be mentioned why?

4. More than one type of heat exchanger and different temperatures could be tried.

5. The last sentence of conclusion confirms that the long term operation is needed for this process for fouling study.

The sentence mentioned in Conclusion is “ In order to determine the impact of membrane fouling on MD performance, long-term studies is needed.”

Please explain how much time was chosen for continuous operation and why?

6. references are appropriate.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

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