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26 Feb 2021
26 Feb 2021
Abstract. In Ethiopia (Ziway town) an excess fluoride (≥ 1.5 mg/L) consumption in drinking water (ground water and Lake Ziway) sources causes a health problem on the communities. The surrounding of inhabitant's peasant farmers of drinking water sources was extremely relying on this polluted fluoride concentration of water. This investigation was focused on defluoridation of drinking water by natural zeolite modified with a cationic surfactant in a batch system and Hexadecy Trimethyl Ammonium Bromide were used for zeolite modification. The Batch experiments also conducted to test for preferential removal of fluoride from water by surfactant-modified zeolite. The zeolite treatments had an aggregate size of 1.4 to 2.4 mm. The cationic surfactant-modified zeolite, and raw zeolite were used in all experiments. The removal efficiency of the treatment was influence by pH of solution (5.5 ± 0.2–8.5 ± 0.2), initial concentration of fluoride (1–10 mg/L), dose of surfactant-modified zeolite (2.5–18 g/L), contact time (30–180 Minute), and effect of temperature was investigated. The study investigated that, at the constant Blank of 10 mg/L, 5 g/L of Hexadecy Trimethyl Ammonium Bromide dosage noted the highest fluoride removal potential at the end of the 3hours runtime: Na-LSX (88.4 %), Na-LTA (64.6 %) and ZR (79.8 %). Incompatible to this reflection, the model waters with pH maintained at 5.5 ± 0.2 and 6.5 ± 0.2 verified rapid fluoride removal (89.7 % and 72.3 % respectively) within the first 60 minutes of runtime.
Dessalegn Geleta Ebsa and Adisu Befekadu Kebede
Status: final response (author comments only)
Defluoridation of drinking water by modified natural zeolite with Cationic surfactant, in case of Ziway town, Ethiopia
I believe that the present paper contains interesting results, the structure of experimental and that of results and discussion should be substantially modified. Therefore, I think the manuscript could be accepted for publication after the following major issues are addressed. The whole manuscript revised once again - it has many grammatical, stylistic and typographical mistakes. English should be checked by native speaker. Concrete comments are shown as follows.
Line 17 and 18 – “by natural zeolite modified with a cationic surfactant in a batch system and Hexadecy Trimethyl Ammonium Bromide were used for zeolite modification. The Batch experiments also conducted”. The chemicals and batch experiment should not be written in capital. Abbreviation HDTMA should be here introduced for the first time.
Line 18 - ” The Batch experiments also conducted to test for preferential removal of fluoride from water by surfactant-modified zeolite.”
This is repetition and should be removed.
Overall English should be checked and corrected (just some of the examples):
Line 21 - “was influence”
Line 32 – “the most electronegative elements which have a negative charge”
Line 71 – “Drinking water samples will collects”
Line 74 – “A cross-sectional study was conducted to removes”
Line 78 – “cationic surfactants will analyzed by”
Line 124 – “were under took for adsorption”
Line 152 – “followed with lesser fluoride”
Line 24 - “The removal efficiency of the treatment was influence by pH of solution (5.5 ± 0.2 – 8.5 ± 0.2), initial concentration of fluoride(1-10mg/L), dose of surfactant-modified zeolite (2.5-18 g/L), contact time (30-180 Minute), and effect of temperature
was investigated.” – What is the temperature range that is being investigated?
Line 26 – Abbreviations that are mentioned for the first time in the abstract are not clear and confusing. What does Na-LSX, Na- LTA and ZR mean?
Line 27 – At what initial fluoride concentration was rapid fluoride removal?
General remark
Numbering is incorrect. Introduction should be 1. It is confusing that Materials and methods suddenly start with 3. What happened with 2.?
Introduction
Materials and Methods
Results and discussion
The paper is about the removal of fluoride with modified zeolites. This is an important topic, since fluoride contamination of drinking water is a serious problem in the region where the study was conducted. However, the quality of the paper is low. The set-up of the experiments have drawbacks, the analysis of the results are weak, the use of references for the discussion of the results is poor, and the manuscript has severe language issues.
General comments:
Specific comments:
Dessalegn Geleta Ebsa and Adisu Befekadu Kebede
Dessalegn Geleta Ebsa and Adisu Befekadu Kebede
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