Improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound

Bibliographic Details
Title: Improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound
Authors: Parastoo Setareh, Meghdad Pirsaheb, Seyed Mostafa Khezri, Hiwa Hossaini
Source: Water Supply, Vol 21, Iss 4, Pp 1410-1422 (2021)
Publisher Information: IWA Publishing, 2021.
Publication Year: 2021
Collection: LCC:Water supply for domestic and industrial purposes
LCC:River, lake, and water-supply engineering (General)
Subject Terms: nom, post-oxidation, pre-coagulation, turbidity, ultrasound/ozone, Water supply for domestic and industrial purposes, TD201-500, River, lake, and water-supply engineering (General), TC401-506
More Details: Recently, we showed that pre-treatment with ultrasound/ozone (US/O3) could remarkably enhance the performance of coagulation in removing natural organic matter (NOM) and turbidity from surface waters. In the present study another of our aims was to investigate whether pretreatment with coagulation combined with post-oxidation (US/O3) can also remove NOM, turbidity and coliform from the same water resources. NOM and turbidity removal were measured by UV absorbance at 254 nm (UV254) and a turbidimeter, respectively. Aluminum sulfate (alum), ferric chloride (FC), and poly aluminum chloride (PACl) were tested as coagulants. The disinfection potential of the US/O3 process was evaluated by measuring coliform counts. The effects of different input variables including ozone dose, power intensity, ultrasound frequency, reaction time, coagulant type, dose of coagulant and coagulant aid were examined on the process performance. Design of experiments (DoE) and surface response methodology (RSM) techniques were employed to optimize the operating parameters. Individual coagulation process with ferric chloride decreased NOM and turbidity up to 33% and 15%, however pre-coagulation with ferric chloride combined with US/O3 decreased NOM and turbidity 75% and 32%, respectively. PACL was the best coagulant in the sole coagulation, but in pre-coagulation combined with US/O3 process, FC exhibited the best performance. Treatment with US/O3 following pre-coagulation decreased the amount of coagulant and coagulant aid needed for the treatment. Pre-coagulation followed by US/O3 improves the NOM, turbidity and coliform removal, and so could be considered as a potential method for removing NOM, turbidity and coliform. HIGHLIGHTS Pre-coagulation combined with ultrasound/ozone (US/O3) improved NOM and turbidity removal.; The optimal coagulant type and concentration in the individual coagulation process were different from and higher than in the combination treatment.; Among the experimental parameters of the US/O3 process, the intensity was the most effective one for turbidity and NOM removal.; US/O3 post-oxidation process is a potential disinfection technique.;
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1606-9749
1607-0798
Relation: http://ws.iwaponline.com/content/21/4/1410; https://doaj.org/toc/1606-9749; https://doaj.org/toc/1607-0798
DOI: 10.2166/ws.2020.323
Access URL: https://doaj.org/article/bcdae5032a9142218c171894331e8cd3
Accession Number: edsdoj.bcdae5032a9142218c171894331e8cd3
Database: Directory of Open Access Journals
More Details
ISSN:16069749
16070798
DOI:10.2166/ws.2020.323
Published in:Water Supply
Language:English