CO2 Addition and Semicontinuous Feed Regime in Shaded HRAP—Pathogen Removal Performance
, Sarah Farias Lacerda 1, Maria Alice Nantes 1, Mayara Leite Serejo 4, Gustavo Henrique Ribeiro da Silva 3 and Marc Árpad Boncz 1Round 1
Reviewer 1 Report
The authors placed in the title of the article the effect of CO2 on the removal of pathogens. However, they were unable to confirm this effect. The title of the article sounds like this influence has been discovered. Thus, the data obtained do not confirm the previously made observations to which the authors refer (Ruas et al. 2018). To explain this, versions are put forward, for example, the difference in the species of algae. But this is not verified in the article.
The feeding regimen affected only the removal of one type of pathogen, but judging by Figure 1, this effect is not statistically confirmed.
As a result, everything in the title is not supported by the conclusions.
And for example, such an observation as an increase in the mass of algae due to aeration of CO2 is obvious.
General conclusion: the article contains too little new and valuable experimental material to be published.
Author Response
Reviewer 1: We appreciate your contributions, all your comments have been answered in the attached document (Response to Reviewers_29-11-22.pdf).
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The manuscript "Influence of CO2 addition and semicontinuous feed regime on pathogen removal - shaded HRAP" is very well written and includes a lot of experimental information required by the scientific community to obtain a complete view considering the effect of CO2 on pathogen removal. I would propose to the authors to make more clear the innovation of this study, the innovative steps or techniques used in this work.
Author Response
Reviewer 2: We appreciate your contributions, all your comments have been answered in the attached document (Response to Reviewers_29-11-22.pdf).
Author Response File: Author Response.pdf
Reviewer 3 Report
This is the review of the manuscript entitled " Influence of CO2 addition and semicontinuous feed regime on 1 pathogen removal - shaded HRAP ". The authors present an topic being in line with the mission of the Water. It seems to be an interesting work. I have some suggestions:
- The authors should indicate how many test repetitions were done?
- Authors should use latest references.
- In my opinion, the lack all results of lights intensity.
- In my opinion, realisation of aims of this manuscript demand one more test. This test should has operational conditions: CO2 addition and fed regime 0.1 h.
Author Response
Reviewer 3: We appreciate your contributions, all your comments have been answered in the attached document (Response to Reviewers_29-11-22.pdf).
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The authors made changes to the text of the article, in particular, changed the title and added statistical information.
There are no comments on planning and conducting experiments. Still, it is worth noting that relatively little information was extracted from the experiments. Perhaps the article will be interesting from the point of view of the methodology for conducting such studies.
