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- Title
Effect of Aureococcus anophagefferens biomass on its inactivation by hydrogen peroxide: culture study and empirical modeling.
- Authors
Randhawa, Varunpreet; Thakkar, Megha; Wei, Liping
- Abstract
Hydrogen peroxide (HO) has been shown effective in selectively removing brown tide algal bloom caused by the pelagophyte Aureococcus anophagefferens. This paper uses culture studies and a modeling approach to examine the inactivation of A. anophagefferens by HO. Specifically, the effects of the initial cell density of A. anophagefferens on the decomposition of the externally added HO and the inactivation of the alga were evaluated. In the presence of A. anophagefferens at an initial cell density of 0.04-1.5 × 10 cells mL, 70-98 % of the externally added 1.6 mg L HO was decomposed within 24 h, and the rate of HO decomposition increased with increasing cell density. When the initial cell density ( B) was 0.09-1.5 × 10 cells mL, the initial HO addition ( C) was 0.8-1.6 mg L, and the contact time ( t) was less than 24 h, the inactivation of A. anophagefferens followed an empirical model: ln(IVF / IVF) = −0.014ln( B) C t, where IVF / IVF is the inactivation efficiency and is the ratio of the alga's in vivo chlorophyll fluorescence at time t and time zero. This model predicts a narrow range of HO dosage of 0.9−2.1 mg L, which is capable of effectively inactivating A. anophagefferens of category 3 bloom density (0.2-1.5 × 10 cells mL) within 8-24 h. Overall, the empirical model provides an initial description of the inactivation of A. anophagefferens by HO as a function of cell density, dosage, and time.
- Publication
Journal of Applied Phycology, 2014, Vol 26, Issue 1, p349
- ISSN
0921-8971
- Publication type
Article
- DOI
10.1007/s10811-013-0107-3