:: Volume 6, Issue 1 (Winter 2019) ::
Environ. health eng. manag. 2019, 6(1): 53-61 Back to browse issues page
Effects of pre-ozonation and chemical coagulation on the removal of turbidity, color, TOC, and chlorophyll a from drinking water
Bahman Masoomi , Neamatollah Jaafarzadeh , Tayebeh Tabatabaie , Esmaeil Kouhgardi , Sahand Jorfi
Corresponding Author: Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran , Jaafarzadeh-n@ajums.ac.ir
Abstract:   (2456 Views)
Background: Ozone can be used as a single technology or in combination with other processes to improve 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: The highest removal efficiency of parameters in the state of pre-ozonation alone and preozonation 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 rate of turbidity, total organic carbon (TOC), color, and chlorophyll a in contact time of 20 minutes was 76.9%, 52.8%, 66.6%, and 85%, respectively. However, compared to ozonation under similar conditions, 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 the removal of parameters.
Conclusion: However, since pre-ozonation can be effectively used to improve the coagulation efficacy in the drinking water treatment, the pre-ozonation combined with coagulation is proposed as an alternative to conventional coagulation to improve the process of drinking water treatment plant.
Keywords: Pilot projects, Drinking water, Water quality, Ozone, Flocculation, Kaolin, Clay, Green algae
eprint link: http://eprints.kmu.ac.ir/id/eprint/30843
Full-Text [PDF 834 kb]   (781 Downloads)    
Type of Study: Research | Subject: Special
Received: 2019/03/19 | Accepted: 2019/03/19 | Published: 2019/03/19

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Volume 6, Issue 1 (Winter 2019) Back to browse issues page