Theoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation

Phosphate removal from seawater is important for biofouling control on RO membranes because phosphorus is one of the nutrients for microbial growth. This paper is based on the hypothesis that multi-stage coagulation results in better phosphate removal. Therefore, comparison of phosphate removal with...

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Autores principales:	Wei Jin, Dongliang Hao, S. Assiyeh Alizadeh Tabatabai, Maria Kennedy, Jan C. Schippers
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	multi-stage coagulation one-step dosing phosphate removal three-step dosing 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/06ed7dadff434e9fa825398fbe5b71df
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spelling	oai:doaj.org-article:06ed7dadff434e9fa825398fbe5b71df2021-11-23T18:56:34ZTheoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation1606-97491607-079810.2166/ws.2021.135https://doaj.org/article/06ed7dadff434e9fa825398fbe5b71df2021-11-01T00:00:00Zhttp://ws.iwaponline.com/content/21/7/3725https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Phosphate removal from seawater is important for biofouling control on RO membranes because phosphorus is one of the nutrients for microbial growth. This paper is based on the hypothesis that multi-stage coagulation results in better phosphate removal. Therefore, comparison of phosphate removal with one-step and three-step dose coagulation from the aspects of both the theoretical calculation and experimental results is investigated in this paper. The result of theoretical calculation based on the Freundlich equation shows that the final phosphate concentration from a three-step dose, i.e. 0.43 μgP/L, is ten times lower than that from a one-step dose, i.e. 4.47 μgP/L. The experimental result shows that for the three-step dose, final phosphate concentration is 1.0 μgP/L, which is lower than for the one-step dose (i.e. 4.0 μgP/L), but not as low as the theoretical calculated value (0.43 μgP/L). This discrepancy between theoretical calculation and experimental result may be the impact of equilibrium phosphate concentration, different initial Fe:P molar ratio and NOM competition between one-step dose and three-step dose coagulation. Although this discrepancy exists, the experimental results still showed that multi-stage coagulation presented better phosphate removal in seawater to concentration levels that are lower than with conventional coagulation. In other words, the problem of the high coagulant dosage in the pretreatment process while removing phosphate from seawater may be solved by application of multi-stage coagulation instead of conventional coagulation. HIGHLIGHT The hypothesis is tested that multi-stage coagulation results in better phosphate removal from seawater.; Phosphate removal with one-step and three-step dose coagulation is compared according to theoretical calculation and experimental results.; Theoretical calculation and experimental results both show better phosphate removal with three-step dose than with one-step dose coagulation.; Application of multi-stage coagulation instead of conventional coagulation may be a way to solve the problem of high coagulant dosage for phosphate removal from seawater.;Wei JinDongliang HaoS. Assiyeh Alizadeh TabatabaiMaria KennedyJan C. SchippersIWA Publishingarticlemulti-stage coagulationone-step dosingphosphate removalthree-step dosingWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 7, Pp 3725-3734 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	multi-stage coagulation one-step dosing phosphate removal three-step dosing Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	multi-stage coagulation one-step dosing phosphate removal three-step dosing Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Wei Jin Dongliang Hao S. Assiyeh Alizadeh Tabatabai Maria Kennedy Jan C. Schippers Theoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation
description	Phosphate removal from seawater is important for biofouling control on RO membranes because phosphorus is one of the nutrients for microbial growth. This paper is based on the hypothesis that multi-stage coagulation results in better phosphate removal. Therefore, comparison of phosphate removal with one-step and three-step dose coagulation from the aspects of both the theoretical calculation and experimental results is investigated in this paper. The result of theoretical calculation based on the Freundlich equation shows that the final phosphate concentration from a three-step dose, i.e. 0.43 μgP/L, is ten times lower than that from a one-step dose, i.e. 4.47 μgP/L. The experimental result shows that for the three-step dose, final phosphate concentration is 1.0 μgP/L, which is lower than for the one-step dose (i.e. 4.0 μgP/L), but not as low as the theoretical calculated value (0.43 μgP/L). This discrepancy between theoretical calculation and experimental result may be the impact of equilibrium phosphate concentration, different initial Fe:P molar ratio and NOM competition between one-step dose and three-step dose coagulation. Although this discrepancy exists, the experimental results still showed that multi-stage coagulation presented better phosphate removal in seawater to concentration levels that are lower than with conventional coagulation. In other words, the problem of the high coagulant dosage in the pretreatment process while removing phosphate from seawater may be solved by application of multi-stage coagulation instead of conventional coagulation. HIGHLIGHT The hypothesis is tested that multi-stage coagulation results in better phosphate removal from seawater.; Phosphate removal with one-step and three-step dose coagulation is compared according to theoretical calculation and experimental results.; Theoretical calculation and experimental results both show better phosphate removal with three-step dose than with one-step dose coagulation.; Application of multi-stage coagulation instead of conventional coagulation may be a way to solve the problem of high coagulant dosage for phosphate removal from seawater.;
format	article
author	Wei Jin Dongliang Hao S. Assiyeh Alizadeh Tabatabai Maria Kennedy Jan C. Schippers
author_facet	Wei Jin Dongliang Hao S. Assiyeh Alizadeh Tabatabai Maria Kennedy Jan C. Schippers
author_sort	Wei Jin
title	Theoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation
title_short	Theoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation
title_full	Theoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation
title_fullStr	Theoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation
title_full_unstemmed	Theoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation
title_sort	theoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/06ed7dadff434e9fa825398fbe5b71df
work_keys_str_mv	AT weijin theoreticalandexperimentalinvestigationofphosphateremovalfromseawaterbymultistagecoagulation AT donglianghao theoreticalandexperimentalinvestigationofphosphateremovalfromseawaterbymultistagecoagulation AT sassiyehalizadehtabatabai theoreticalandexperimentalinvestigationofphosphateremovalfromseawaterbymultistagecoagulation AT mariakennedy theoreticalandexperimentalinvestigationofphosphateremovalfromseawaterbymultistagecoagulation AT jancschippers theoreticalandexperimentalinvestigationofphosphateremovalfromseawaterbymultistagecoagulation
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Theoretical and experimental investigation of phosphate removal from seawater by multi-stage coagulation

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