Real-Scale Integral Valorization of Waste Orange Peel via Hydrodynamic Cavitation
Round 1
Reviewer 1 Report
I find the paper interesting and worth publishing. Here are some specific comments:
1. Please give some more details about the Venturi nozzle (throat diameter, shape, angles).
2. can you provide images or other characterisation of cavitation inside the Venturi?
3. How was the peel pretreated? Was it grinded? To what size, how does it effect the flow conditions and cavitation? Did you experience problems with reduced flow due to sealing by WOP inside of Venturi?
4. Your temperature rised, almost to boiling, how toes this eefect the jield? Is it significant? Is cavitation even needed? Did you make tests with flow but without cavitation presence?
5. Please give more details on this "blank test".
6. How does your method compare to other, existing ones?
7. What about wear of flow components due to cavitation?
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 2 Report
This MS explored the use of hydrodynamic cavitation for the extraction of chemicals and energy materials from waste orange peel. The topic is interesting and the results are adequately given. However, this MS requires revision before its publication considering following points.
- Improve the writing. Avoid sentences that are too long, especially those with many commas (,). Also there are incomplete sentences.
- The flow in the Introduction is not smooth. The authors need to re-establish the paragraphs so that the readers can understand the background, state-of-the-art research in this field, and the motivation.
- L230. What is cavitation number? Please give some explanation here or before.
- L257. What was the inoculum to substrate ratio?
- L258. “inoculum” drawn from an existing biogas generation plant?
- L259-261. 94.2% moisture and 25.1% ash? Clarify the units of the parameters, for example if they are wet or dry based.
- Table 2. It would be nice to put the experimental BMP (from Figures 5 and 6) in this Table for direct comparison.
- Figure 5. Standardize the biogas volume per mL working volume or g (mg) VS.
- Figures 5 and 6. Delete Figure 6 or combine them as one Figure (a and b).
Author Response
Please see the attachment.
Author Response File: Author Response.pdf