Assessment of Carbon Reduction Benefits of A/O-Gradient Constructed Wetland Renovation for Rural Wastewater Treatment in the Southeast Coastal Areas of China Based on Life Cycle Assessment: The Example of Xiamen Sanxiushan Village

Round 1

Reviewer 1 Report

Dear Author

Please check the attached document

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

My detailed and specific comments can be found in the attached pdf file.

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Constructed wetlands and landscape trees for which is no uniform calculation method. The carbon storge of trees was quantified using the “i-Tree Eco” module of the "i-Tree" model, 218 which has a wide range of applications and can especially target the ecological benefits of each tree; the carbon storge of Constructed wetlands was estimated by the carbon storge rate method, whose calculation equation is as follows.

(need a reference for I tree method)

 

Table 1. GHG emissions factors in the construction stage.(Ministry of Housing and Urban-Rural Development of the People’s Republic of China, 2019) [26-31]

Please provide a system boundary of these data. Does the stipulated GHG emissions of these materials include mining, and manufacturing of these materials. What are the sources of energy for their productions? These products are ultimately being used in your study Hence, the system boundary of your study is not the same for construction materials.

To reduce the work author may add a new section in the method section stating the embodied carbon of the construction materials and their system boundary.

 

Table 2. GHG emissions factors for the use stage [32,33].

Where are these GHGs coming from. Are they originated from the equipment used to spread those chemicals or they are generated from manufacturing of these chemicals that should be clearly stated in the legend of the Table or in the text.

 

 

Table 6: Pharmaceuticals Sodium hypochlorite?  What are those these are not discussed in the text.

 

FIGURE 5: x axis label is written in Chinese.  The source of standard deviation is not given in the text. Some of the bars do not have standard deviation.

 

I have also uploaded the manuscript underlined sentences have grammatical problems.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Thank you so much to all the listed authors for patiently addressing my comments. I think the MS can be accepted in its present form.

Author Response

Thank you very much for all your comments and help with this study, they will not only help me in writing this paper but will also give me great positive feedback for my future research, all of which will benefit me a lot!