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• W4225130164 endingPage "155564" @default.
• W4225130164 startingPage "155564" @default.
• W4225130164 abstract "Bioflocculants gain attention as alternatives to chemical flocculants because they are more environmentally friendly and highly biodegradable. This study aims to improve the bioflocculant production by Serratia marcescens using one-variable-at-a-time (OVAT) analysis and analyze its flocculating activity performance, toxicity, and the flocculation mechanism. The effect of multiple variables including initial inoculum size, pH, mixing speed, temperature, growth medium, and incubation period was assessed through OVAT. Flocculating activity was then determined via jar test analysis, and toxicity test was performed using Daphnia magna and Daphnia pulex. The flocculation mechanism was determined via particle size distribution and zeta potential analysis. The optimum conditions for the improved bioflocculant production were as follows: 10% v/v initial inoculum size, pH 7, mixing speed of 150 rpm, room temperature, nutrient broth medium, and 72 h of incubation period. Scanning electron microscopy showed flake-like intact structure with coarse surface. The produced bioflocculant showed flocculating activity of 48% in 5227 ± 580 NTU initial kaolin turbidity with 1 mg/L concentration and 5% v/v dosage of bioflocculant, following the second-order kinetics. Toxicity test to D. magna and D. pulex showed the 48 h LC50 values of 8.06 and 6.42 g/L, respectively; these values are greatly higher than the fabricated chemical flocculants. The flocculation process using bioflocculant produced by S. marcescens was suggested to occur via bridging mechanism because it greatly affected the particle size distribution. Results indicated that bioflocculant produced by S. marcescens is much environmentally friendly and has great potential for turbidity removal in water/wastewater." @default.
• W4225130164 created "2022-05-01" @default.
• W4225130164 creator A5006887898 @default.
• W4225130164 creator A5007677051 @default.
• W4225130164 creator A5020754166 @default.
• W4225130164 creator A5032510790 @default.
• W4225130164 creator A5045487909 @default.
• W4225130164 creator A5051835599 @default.
• W4225130164 creator A5055787027 @default.
• W4225130164 creator A5066562888 @default.
• W4225130164 creator A5073748814 @default.
• W4225130164 creator A5077853470 @default.
• W4225130164 date "2022-08-01" @default.
• W4225130164 modified "2023-09-26" @default.
• W4225130164 title "Assessing the effect of multiple variables on the production of bioflocculant by Serratia marcescens: Flocculating activity, kinetics, toxicity, and flocculation mechanism" @default.
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