Three-Dimensional Electrochemical Oxidation System with RuO₂-IrO₂/Ti as the Anode for Ammonia Wastewater Treatment

Round 1

Reviewer 1 Report (Previous Reviewer 1)

Comments and Suggestions for Authors

The work has been revised.

Author Response

Thank you for reviewing and recognizing.

Reviewer 2 Report (Previous Reviewer 2)

Comments and Suggestions for Authors

After reviewing the manuscript "A three-dimensional electrochemical oxidation system with RuO2-IrO2/Ti as anode for ammonia wastewater treatment", I recommend its approval in this revised form.

Author Response

Thank you for reviewing and recognizing.

Reviewer 3 Report (Previous Reviewer 5)

Comments and Suggestions for Authors

I find that the Article entitled: "A three-dimensional electrochemical oxidation system with RuO2-IrO2/Ti as anode for ammonia wastewater treatment" is very interesting.

In this paper, the authors reported the research of a three-dimensional electrode system was constructed to treat the ammonia-nitrogen wastewater generated from the tail gas absorption of a methionine producer by using homemade cellulose acetate coated activated carbon mixed with granular activated carbon. The effects of current density, initial pH value of wastewater, plate spacing, NaCl concentration and particle filling amount on CODCr and NH4+-N removal were analyzed through one-factor sequential batch experiments. Тhe mechanism of electrolytic treatment of ammonia nitrogen wastewater by three-dimensional electrode under this system was studied by means of cyclic voltammetry, scanning electron microscope, energy dispersive spectrometer and control experiment. The presented results showed that the average removal rate of CODCr was 91.03 % and that of NH4+-N was 98.89 % after the electrolysis reaction for 5 h under the optimized current density of 40 mA/cm2, no pH adjustment, the spacing of the electrode plates of 8cm, the NaCl dosing concentration of 1 g/L, and the particle filling amount of 400 g/L. The study of the electrocatalytic oxidation mechanism shows that the RuO2-IrO2/Ti three-dimensional electrode system mainly exerts electrocatalytic oxidation efficacy through indirect oxidation of electrogenerated oxidants under the present experimental conditions. 

However, in this paper Figures 2 and 3 are not well numbered. Please check the text with their interpretations.

Accordingly, I recommend reconsider after minor revision.

Author Response

Thank you for pointing this out.In our resubmission of the manuscript, we have corrected the numbering of Figures 2 and 3 and their annotations.

This manuscript is a resubmission of an earlier submission. The following is a list of the peer review reports and author responses from that submission.

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

Some figures in this draft is missing, such as Figure 1, 3, 4, 5, and 6. In addition, there are two Figures 2. It is recommended to re-edit before proceeding to the review process.

Author Response

Author Response File: Author Response.docx

Reviewer 2 Report

Comments and Suggestions for Authors

The manuscript "A three-dimensional electrochemical oxidation system with RuO2-IrO2/Ti as anode for ammonia wastewater treatment" is interesting and original. However, the authors need to improve the following:

1. There are several figures that are not in the manuscript. Without them it is impossible to evaluate what is written.

2. Consequently, the discussion and conclusions of the work are affected.

Author Response

Author Response File: Author Response.docx

Reviewer 3 Report

Comments and Suggestions for Authors

The authors conducted enough experiments under the proposed topic, but the results were presented in a way that is hard for readers to understand.

1. There is no Figure 1, 5 and 6. Other figures have poorly organized numbering.

2. The expression of "Various elements have their own specific wavelengths of X-rays..." in Line 228-230, is not scientific.

3. The figure captions require more detailed descriptions. For example, the authors shall describe clearly what is sketched in each sub figure in Figure 2.

 

 

Comments on the Quality of English Language

It is suggested that the authors go through the manuscript with a native speaker with physics background.

Author Response

Author Response File: Author Response.docx

Reviewer 4 Report

Comments and Suggestions for Authors

 

The authors studied the three-dimensional electrochemical oxidation system with RuO₂-IrO₂/Ti as anode for ammonia wastewater treatment.

The following observations are made with respect to the investigation:

Number 2 should be in subscript format RuO2-IrO2/Ti. Line 12.

 Figure 1 is not available in the manuscript.

 There are two pictures in the article with the same caption Figure 2. Authors need to correct the numbering of all the figures.

 Figures 5 and 6 is missing in the manuscript.

 Section 3.2.3 should be expanded to describe in more detail the Electrocatalytic oxidation mechanism of 3DEOS.

 The authors should format the manuscript more carefully and read the whole text again

 

 

Comments on the Quality of English Language

Minor editing of English language required

Author Response

Author Response File: Author Response.docx

Reviewer 5 Report

Comments and Suggestions for Authors

I find that the Article entitled: "A three-dimensional electrochemical oxidation system with RuO2-IrO2/Ti as anode for ammonia wastewater treatment" is very interesting.

In this paper, the authors reported the research of a three-dimensional electrode system was constructed to treat the ammonia-nitrogen wastewater generated from the tail gas absorption of a methionine producer by using homemade cellulose acetate coated activated carbon mixed with granular activated carbon. The effects of current density, initial pH value of wastewater, plate spacing, NaCl concentration and particle filling amount on CODCr and NH4+-N removal were analyzed through one-factor sequential batch experiments. Тhe mechanism of electrolytic treatment of ammonia nitrogen wastewater by three-dimensional electrode under this system was studied by means of cyclic voltammetry, scanning electron microscope, energy dispersive spectrometer and control experiment. The presented results showed that the average removal rate of CODCr was 91.03% and that of NH4+-N was 98.89% after the electrolysis reaction for 5h under the optimized current density of 40mA/cm2, no pH adjustment, the spacing of the electrode plates of 8cm, the NaCl dosing concentration of 1g/L, and the particle filling amount of 400g/L. The study of the electrocatalytic oxidation mechanism shows that the RuO2-IrO2/Ti three-dimensional electrode system mainly exerts electrocatalytic oxidation efficacy through indirect oxidation of electrogenerated oxidants under the present experimental conditions.

However, the paper is technically not well organized, the images are completely mixed or not presented, so the discussions cannot be concretely and scientifically understood.

It is necessary to completely technically revise the entire work and strictly manage the connection of the obtained results and their interpretations.

Accordingly, I recommend reconsider after minor revision (corrections to minor methodological errors and text editing).