NaDCC) and sodium hypochlorite (NaOCL): Modeling, optimization and comparative analysis

Abstract

The aim of this study was to evaluate the ability of sodium dichloroisocyanate (NaDCC) and sodium hypochlorite (NaOCL) for wastewater disinfection in a batch system with considering the contact time (5, 10, 15 min) and disinfectant concentration (0.01, 0.02, 0.04, 0.06, 0.08, 0.1, 0.2, 0.4 mg/L). Distilled water was mixed with wastewater to produce a given concentration of bacteria. Pure plate count (PPC) method was used to determine the initial and final concentration of bacteria. Three regression models including first order (FO), first order plus two way interaction (FO + TWI), and second order (SO) were used to fit the experimental data. The differences among group means were analyzed using Kruskal-Wallis and ANOVA analysis. The removal efficiency of NaDCC and NaOCl were 88.7 and 52.38% at an initial concentration of 0.01 mg/L and contact time of 10 min. The results of Kruskal-Wallis test showed that the mean of disinfection efficiencies were statistically different at different concentration of disinfectant (p-value < 0.05). However, there was no statistically significant difference between removal efficiency at different contact time based on one way ANOVA analysis (p-value > 0.05). These results were the same for both disinfectants. The modeling data showed that the best regression model to describe the disinfection mechanism was SO model with R 2 value of about 0.84 for both NaDCC and NaOCl. According to the present study, it can be concluded that the NaDCC is more suitable for water and wastewater disinfection because of higher efficiency at lower contact time and concentration.

Data for factor analysis of hydro-geochemical characteristics of groundwater resources in Iranshahr

“…Determination of temporal and permanent values of hardness, calcium and magnesium, iron, nitrate, alkalinity, sulfate and chloride by titrimetry and alkalinity by titration with Chloride acid or 0.02 n sulfuric acid were carried out according to the methods stated in the method standard reference [17] , [18] , [19] , [20] , [21] , [22] , [23] , [24] .…”

Data for comparison of chlorine dioxide and chlorine disinfection power in a real dairy wastewater effluent

“…To prepare chlorine dioxide from sodium chloride 25% (7.5%) and chloric acid 37% (9%) Merck, Germany was used. The multiple-tube fermentation technique (here 10 tubes) was used for microbial analysis, the results were reported as the most probable number index (MPN) respectively [1] , [2] , [3] . In this technique, specific volumes of sample are placed on appropriate culture medium into the test tubes.…”

“…We also used Azide Dextrose broth to detect faecal streptococci and the results were reported as MPN table. Heterotrophic bacteria was detected by plate count using pour plate and presented by colony forming unit (Colony Forming Unit) respectively [1] , [2] , [3] . The residual level of Chlorine dioxide and Chlorine and also microbial analysis were measured according to the standards for water and wastewater treatment handbook [4] , [5] , [6] , [7] , [8] .…”

Data for distribution of various species of fecal coliforms in urban, rural and private drinking water sources in ten years period – A case study: Kermanshah, Iran

“… Monitoring the quality of drinking water resources especially in term of microbial quality is necessary [1] , [2] , [3] , [4] , [5] , [6] , [7] , due to the variety and wide range of drinking water sources in the Kermanshah city. The obtained data can assist in identifying contaminated resources and planning to adopt a long and short-term strategy for safe water supply.…”