التفاصيل البيبلوغرافية
| العنوان: |
Efficacy of H 2 O 2 on the removal kinetics of H 2 S in saltwater aquaculture systems, and the role of O 2 and NO 3 . |
| المؤلفون: |
Bergstedt JH; Technical University of Denmark, DTU Aqua, Section for Aquaculture, The North Sea center, P.O. Box 101, DK-9850 Hirtshals, Vælg venligst region, Denmark. Electronic address: juhala@aqua.dtu.dk., Skov PV; Technical University of Denmark, DTU Aqua, Section for Aquaculture, The North Sea center, P.O. Box 101, DK-9850 Hirtshals, Vælg venligst region, Denmark., Letelier-Gordo CO; Technical University of Denmark, DTU Aqua, Section for Aquaculture, The North Sea center, P.O. Box 101, DK-9850 Hirtshals, Vælg venligst region, Denmark. |
| المصدر: |
Water research [Water Res] 2022 Aug 15; Vol. 222, pp. 118892. Date of Electronic Publication: 2022 Jul 23. |
| نوع المنشور: |
Journal Article |
| اللغة: |
English |
| بيانات الدورية: |
Publisher: Pergamon Press Country of Publication: England NLM ID: 0105072 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-2448 (Electronic) Linking ISSN: 00431354 NLM ISO Abbreviation: Water Res Subsets: MEDLINE |
| أسماء مطبوعة: |
Original Publication: Oxford, Pergamon Press. |
| مواضيع طبية MeSH: |
Hydrogen Peroxide* , Water Purification*/methods, Animals ; Aquaculture ; Nitrates ; Oxygen |
| مستخلص: |
The occurrence of hydrogen sulfide (H 2 S) represents a challenge for recirculating aquaculture systems (RAS) under saline conditions. Even low concentrations of the toxic gas can result in sudden mass mortalities of fish, leading to large economic losses. There is an urgent need for efficient strategies to remove H 2 S, which can be applied effectively with a short response time, to prevent the risk of H 2 S-induced casualties. This study examines the kinetics of the two common oxidants applied to rearing water in a RAS facility; oxygen (O 2 ) and hydrogen peroxide (H 2 O 2 ) and evaluates their efficiency and applicability for the removal of H 2 S in an industrial RAS. Furthermore, we tested whether nitrate (NO 3 - ) can be an oxygen donor in the chemical oxidation of H 2 S. The baseline oxidation rates of H 2 S by O 2 were determined in air-equilibrated seawater (SW) and RAS water (RASW). The feasibility of using H 2 O 2 as a practical treatment was evaluated by testing increasing H 2 O 2 to H 2 S ratios in SW. In addition, RASW dilutions that yielded different concentrations of NO 3 - and total chemical oxygen demand (TCOD) were tested to identify their effects on H 2 S removal. The half-lives (t ½ ) of H 2 S, derived from O2 oxidation rates, were considerably shorter in SW (118.5 ± 28.6 min) compared to RASW (168.0 ± 18.7 min). The addition of a 1:1 mole ratio of H 2 O 2 to H 2 S, significantly increased the removal rate and decreased the half-life (t ½ ) of H 2 S in SW to 29.5 ± 6.6 min. Further increasing H 2 O 2 :H 2 S ratios to 2:1 and 4:1, reduced t ½ to 21.7 ± 5.2 and 17.4 ± 6.1 min, respectively. Similarly, a dosage of H 2 O 2 at a ratio of 1:1 in RAS water resulted in a considerably shorter t ½ of 86.1 ± 10.1 min. The influence of organic matter on the required H 2 O 2 dose was demonstrated by the t ½ , which were reduced by 49% in RAS water and 75% in SW. NO 3 - was not found to be involved in the chemical removal of H 2 S. The results provide an improved understanding of the influence of RAS water chemistry and quality on H 2 S kinetics and the direct applicability of the kinetics for treating acute H 2 S levels in RAS to avoid mass mortalities. In conclusion, the addition of H 2 O 2 is an efficient water treatment technology for H 2 S removal, and by adjusting H 2 O 2 dosages accordingly to the concentrations of H 2 S and specific systems water parameters, a t ½ <30 min can be achieved. Thus the technology is applicable in an industrial RAS, as a treatment process for acute levels of the hazardous gas H 2 S that is easily implemented, and safe for the fish.
(Copyright © 2022. Published by Elsevier Ltd.) |
| فهرسة مساهمة: |
Keywords: Hydrogen peroxide; Hydrogen sulfide removal; Nitrate; Oxidants; Recirculating aquaculture system; Water quality |
| المشرفين على المادة: |
0 (Nitrates)
BBX060AN9V (Hydrogen Peroxide)
S88TT14065 (Oxygen) |
| تواريخ الأحداث: |
Date Created: 20220802 Date Completed: 20220831 Latest Revision: 20220831 |
| رمز التحديث: |
20221213 |
| DOI: |
10.1016/j.watres.2022.118892 |
| PMID: |
35917668 |
| قاعدة البيانات: |
MEDLINE |
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