Study on Nitrogen Migration during Co-Pyrolysis of Melamine-Impregnated Paper Waste and Camellia Oleifera Shell
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsThe manuscript introduces the migration path of N during co-pyrolysis of Melamine-impregnated paper wastes and camellia oleifera shell, which provides a policy direction and theoretical support for the utilization of both wastes. However, the manuscript needs some revisions before publishing. Some main questions are as follows.
1) In the sentence “Results showed that during the co-pyrolysis process, N in MIPW and COS would be converted into different types of N-containing components, and the proportion of raw materials directly impact the products distribution and N migration path.”, what is “the proportion of raw materials” that directly impact the products distribution? Please state clearly.
2) It is mentioned that this paper can provide direction for the comprehensive utilization of MIPW, whether the nitrogen migration path obtained in this paper can make some suggestions for the high-value utilization of biomass?
3) The expressions of “N functional group” are not uniform, please modify it.
4) In the sentence “The content of N in MIPW is very high,” it is suggested to substitute “high” with “large”.
5) The sentence “the collection of H2SO4/NaOH generated by the reaction with NH3/HCN washing cylinders” is confused, is there the same liquid in two bottles for one experiment? Were NH3 and HCN collected in one experiment or in two parallel experiments?
6) There is a problem with the horizontal coordinates of Figure 7, please modify it carefully
7) As shown in Figure 9, will Pyridinic-N be converted to Pyrrolic-N, and does Pyridinic-N in the products also come from Pyridinic-N directly in the raw material? Please check the clear and perfect the conversion path.
Author Response
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Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsNitrogen is contained in melamine-impregnated paper wastes which are byproduct of the melamine-impregnated paper producing process. In present study the authors investigated the migration path of N during co-pyrolysis process. Extensive measurements using different techniques were performed. However, one point should be addressed by the authors. In conclusion part more attention should be paid to migration path and the migration mechanism itself. It would strengthen the scientific novelty of the work.
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for Authors
The submitted manuscript is interesting from the point of view of detecting nitrogen migration. Processing of the topic corresponds to experimental research. I consider the findings to be valuable for further research.
Nevertheless, I have a few formal and professional comments:
1) It is clear from the beginning of the manuscript that the authors are dealing with "wt.%", however, they forgot to write it right in the Abstract. Similarly, it is from chapter 3, where it is partially mentioned, but in conclusion it is not mentioned at all, likewise in figures. It is necessary to fill in the missing markings of what "%" is in question in the text and in the figures.
2) If only the migration of nitrogen is monitored, it does not say more about the overall result of the co-pyrolysis of the mentioned materials. Some information is missing here, e.g. about the obtained gas. Is the gaseous product useful for something if it contains nitrogen in some form? This is important for energy use. Is it possible that this emerging gas can still be used somewhere? What other ingredients does it have?
3) If I increase the proportion of the component with a higher nitrogen content, then naturally the proportion of nitrogen in some form will also increase in the final product. The information on the proportion of output forms of nitrogen in these products is then interesting.
4) Maybe I didn't understand it correctly, but what is the main goal of co-pyrolysis MIPW and COS besides monitoring nitrogen migration? The disposal of such waste is mentioned in the first sentence of the abstract, but I lack any recommendation in the discussion or conclusion.
5) Figure 9 is interestingly processed, but the description lacks the ratio of the COS and MIPW components. Please complete this information.
I consider the authors' findings regarding nitrogen migration to be important knowledge for further research. I assume that the research is not finished yet, and the results shown have shown the next path of research in this area.
Author Response
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Reviewer 4 Report
Comments and Suggestions for AuthorsThe paper covers study on nitrogen migration during co-pyrolysis of mela-2 mine-impregnated paper waste and camellia oleifera shell. The figures and tables are clear and well described in the manscript. The manuscript includes characterizations which strengthen the paper, however, the following comments must be considered before publication:
-In the abstract, this sentence needs to be modified “In this paper, since the high N content in MIPW, MIPW was used as N source to co-pyrolysis with 10 camellia oleifera shell (COS)” (Line 10-11).
-The introduction is short and I would suggest to add studies where they have addressed XPS and elemental analysis related to the topic of the study.
-I would suggest to compare the characterizations (TGA, XPS) with the similar existing studies in the literature and to be referenced within the text of the paper.
Comments on the Quality of English Languagegrammar and spell check in proofreading
Author Response
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Author Response File: Author Response.pdf
Round 2
Reviewer 3 Report
Comments and Suggestions for AuthorsThe authors made modifications to the submitted manuscript based on comments. My comments were adequately answered and I have no more serious comments that need to be processed. As the authors wrote and also from the content of the submitted manuscript, I assumed that the research would continue and that they would publish other research results. I wish them a lot of positive energy in their research.
