Numerical Investigation of the Hydraulic Impacts Induced by a Bioreactor Installed in a Contaminated Waterway
, Ashraf Jatwary 2, Mahmoud M. Abdel daiem 3,4, Ahmed Ghazy 5, Bandar Alwushayh 1, Mohammad Akrami 6, Muhammad Tariq Bashir 7, Fayez Alanazi 1, Md. Alhaz Uddin 1 and Elsayed Elkamhawy 2,*
Round 1
Reviewer 1 Report
This work entitled “Numerical investigation of the hydraulic impacts induced by a bioreactor installed in a contaminated waterway” by Raid Alrowais et al reported a 3D modes based on the computational fluid dynamics study to investigate the different arrangements of the gravel bioreactor in the open channel. In all, this manuscript can be published in Water after minor revision, details are as follow:
1. The English of this manuscript will need some moderate polishing to make the descriptions and expressions clear to the reader.
2. In Chapter 3, lines 224-228, the authors cited a reference by El-Saiad et al (ref. 11), “a comparison was made…In this study, the medium used was gravel with a porosity of 39%, and the relative heading up was 4.10%”. Can the authors explain the reasons behind this phenomenon in more detail?
3. In chapter 3, lines 235-236, “The chosen time was suitable to reaching the steady state”, can the authors indicate that in more detail?
Author Response
The authors thank the reviewers for their valuable and constructive comments on the manuscript that were very helpful to improve the manuscript
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This study investigates the hydraulic impacts of the number of bioreactors segment, the distance between segments of the bioreactor, and the inclination angle of the bio-filter face installed in an open channel. Overall, this study can be interesting for some readers. However, some questions/issues need further addressing by the authors.
- Only a few previous studies about hydraulics characteristics of flow induced by bioreactor implementation were introduced in the Introduction section. There is also a need to illustrate the gap between the existing studies and the contribution of this study.
- The authors should discuss more how the simulation results can be applied practically: for instance, what does relative heading-up increment mean in a real-world use case?
- The authors should also illustrate how hydraulic factors are associated with the treatment efficacy.
Author Response
The authors thank the reviewers for their valuable and constructive comments on the manuscript that were very helpful to improve the manuscript
Author Response File: 
Author Response.docx
