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

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 c...

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Autores principales:	Parastoo Setareh, Meghdad Pirsaheb, Seyed Mostafa Khezri, Hiwa Hossaini
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	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
Acceso en línea:	https://doaj.org/article/bcdae5032a9142218c171894331e8cd3
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spelling	oai:doaj.org-article:bcdae5032a9142218c171894331e8cd32021-11-06T07:14:49ZImproving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound1606-97491607-079810.2166/ws.2020.323https://doaj.org/article/bcdae5032a9142218c171894331e8cd32021-06-01T00:00:00Zhttp://ws.iwaponline.com/content/21/4/1410https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Recently, 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.;Parastoo SetarehMeghdad PirsahebSeyed Mostafa KhezriHiwa HossainiIWA Publishingarticlenompost-oxidationpre-coagulationturbidityultrasound/ozoneWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 4, Pp 1410-1422 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	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
spellingShingle	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 Parastoo Setareh Meghdad Pirsaheb Seyed Mostafa Khezri Hiwa Hossaini Improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound
description	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.;
format	article
author	Parastoo Setareh Meghdad Pirsaheb Seyed Mostafa Khezri Hiwa Hossaini
author_facet	Parastoo Setareh Meghdad Pirsaheb Seyed Mostafa Khezri Hiwa Hossaini
author_sort	Parastoo Setareh
title	Improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound
title_short	Improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound
title_full	Improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound
title_fullStr	Improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound
title_full_unstemmed	Improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound
title_sort	improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/bcdae5032a9142218c171894331e8cd3
work_keys_str_mv	AT parastoosetareh improvingnaturalorganicmatterandturbidityremovalfromsurfacewaterbyprecoagulationcombinedwithozoneultrasound AT meghdadpirsaheb improvingnaturalorganicmatterandturbidityremovalfromsurfacewaterbyprecoagulationcombinedwithozoneultrasound AT seyedmostafakhezri improvingnaturalorganicmatterandturbidityremovalfromsurfacewaterbyprecoagulationcombinedwithozoneultrasound AT hiwahossaini improvingnaturalorganicmatterandturbidityremovalfromsurfacewaterbyprecoagulationcombinedwithozoneultrasound
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Improving natural organic matter and turbidity removal from surface water by pre-coagulation combined with ozone/ultrasound

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