Effects of pre-ozonation and chemical coagulation on the removal of turbidity, color, TOC, and chlorophyll a from drinking water

Environmental Health Engineering and Management

Tayebeh Tabatabaie¹  Bahman Masoomi¹  Esmaeil Kouhgardi¹  Sahand Jorfi²  Neamatollah Jaafarzadeh² 

[1] Department of Environmental Engineering, Bushehr Branch, Islamic Azad University, Bushehr, Iran;Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran;

关键词: pilot projects;    drinking water;    water quality;    ozone;    flocculation;    kaolin;    clay;    green algae;   

DOI  :  10.15171/EHEM.2019.06

来源: DOAJ

【 摘 要 】

Background: Ozonecanbeusedasasingletechnologyorincombinationwithotherprocessestoimprove the coagulation- flocculation or biodegradability in order to remove pollutants in natural water treatment. Methods: In this study, the effects of pre-ozonation with coagulant substances on the quality parameters of drinking water were investigated using humic acid, kaolin, clay, and green algae in a pilot scale. This study was conducted under laboratory conditions (at both acidic and alkaline pH in different dosages of ozone and coagulant at ozone contact time with simulated water sample (5-20 minutes) in different scenarios).Results:Thehighestremovalefficiencyofparametersinthestateofpre-ozonationaloneandpre-ozonation with a coagulant was observed at contact time of 20 minutes, ozone dosage of 5 g/h, coagulant dosage of 25 mg/L, at alkaline pH along with a decrease in temperature. So that, the average removal rateofturbidity,totalorganiccarbon(TOC),color,andchlorophyllaincontacttimeof20minuteswas76.9%,52.8%,66.6%,and85%,respectively.However,comparedtoozonationundersimilarconditions, the reduction in turbidity, TOC, color, and chlorophyll a was 36.13%, 24.4%, 32.13%, and 79.6%, respectively. Also, it was revealed that pre-ozonation with coagulant could effectively improve theremovalofparameters.Conclusion: However, since pre-ozonation can be effectively used to improve the coagulation efficacy inthedrinkingwatertreatment,thepre-ozonationcombinedwithcoagulationisproposedasanalternativetoconventionalcoagulationtoimprovetheprocessofdrinkingwatertreatmentplant.

【 授权许可】

Unknown