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- W3112240893 endingPage "104903" @default.
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- W3112240893 abstract "Contamination of wastewater increases chlorine demand and alter chlorine and ammonia reaction, and affect breakpoint curve. To determine most influential operating variable(s) on breakpoint chlorination, a previously developed model was used in this research, using three input factors (ammonia, nitrite, and contact time), using a three-way four-level factorial design. To reflect on shape of breakpoint curve and depict any changes on chlorination profile, response variables such as, initial slope, maximum TRC, minimum TRC, and length of combined region, were used. Lenvene’s test for factorial analysis for all response variables indicated unequal variances and confirmed that homogeneity of variance has not been met, i.e. all response variables have different variability across the three input factors. Although ANOVA results expressed no statistically significant three-way interaction between the three factors on response variables, yet different results for two-way interaction effect, main effect and independent effect between input factors, was exhibited. For example, results showed that contact time influenced disinfection system, and that higher ammonia concentration results in faster NH2Cl destruction. In addition, this research indicated that ammonia and nitrite might have different effects on chlorination curve depending on A/N ratio, e.g. ammonia at a relatively higher concentration, suppresses effect of nitrite on rising leg and this is in agreement with literature. This study determined the ratio around which this phenomenon occurs (A/N ratio around 3)." @default.
- W3112240893 created "2020-12-21" @default.
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- W3112240893 date "2021-02-01" @default.
- W3112240893 modified "2023-10-16" @default.
- W3112240893 title "Chlorination breakpoint with nitrite in wastewater treatment: A full factorial design experiments" @default.
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- W3112240893 doi "https://doi.org/10.1016/j.jece.2020.104903" @default.
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