Microfiltration hybrid systems in wastewater treatment for reuse

Guo, W

Microfiltration hybrid systems in wastewater treatment for reuse

Guo, W

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Publication Type:: Thesis
Issue Date:: 2005

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Field	Value	Language
dc.contributor.author	Guo, W
dc.date.accessioned	2015-10-09T00:03:32Z
dc.date.available	2015-10-09T00:03:32Z
dc.date.issued	2005
dc.identifier.uri	http://hdl.handle.net/10453/37436
dc.description	University of Technology, Sydney. Faculty of Engineering.	en_US
dc.description.abstract	Generally, the conventional wastewater treatment cannot remove all the effluent organic matter (EfOM) such as synthetic organic chemicals and natural organic matter etc. As a result, the biologically treated effluent from sewage treatment plant needs to undergo further advanced treatment processes. To obtain water of recyclable quality, initially physico-chemical processes such as flocculation, sedimentation, filtration and adsorption were normally used. However, with advanced technologies and ever increasing stringent water quality criteria, membrane processes are becoming more attractive in water reuse. Among different membrane processes, although microfiltration (MF) can be operated economically, it alone cannot remove organic matter. If MF is combined with an enhanced flocculation or/and adsorption, it will be able to reduce superior level of organic contaminants. The aims of this study are: (i) improving the dissolved organic removal and reduce membrane fouling of two membrane hybrid systems (crossflow microfiltration (CFMF) and submerged membrane adsorption hybrid system (SMAHS)) using different pretreatment methods (flocculation, adsorption and flocculation- adsorption); (ii) investigating the critical flux of a laboratory-scale CFMF with and without different pretreatments. The incorporation of powdered activated carbon (PAC) as pretreatment to CFMF resulted in high TOC removal efficiency (more than 80%) when the PAC-CFMF system was operated at a relatively high filtration flux of 250 L/m2.h. The incorporation of flocculation and PAC as pretreatments to CFMF process resulted in a very high TOC removal efficiency (99.7%) and a stable filtration flux during 5-hour filter run (less than 12% flux decline), when the hybrid system was operated at a higher filtration flux (270 L/m2.h). Application of membrane processes requires lower investment and operating costs. One of the ways is to operate system at a constant filtration flux below the critical flux. With both flocculation and adsorption as pretreatment to CFMF, the critical flux of biologically treated effluent increased dramatically (5-7 times increase). The preadsorption, PAC dose, aeration rate and filtration flux had effects both on organic matter removal efficiency and TMP development. The preadsorption of 1 hour prior to the membrane operation was important in mitigating the membrane fouling. The suitable aeration rate, filtration flux and initial PAC dosing were 16 L/min, < 24 L/m2.h and 5 g/L respectively for the wastewater used in this study. The long term SMAHS experiments conducted with regular PAC replacement indicated that the PAC replacement in PAC-MF reactor could stimulate both biological activity and adsorption, as well as optimize the operation of the hybrid system.	en_US
dc.format	Thesis (PhD)	en_US
dc.language.iso	en	en_US
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/37436/9/02Whole.pdf
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	au.edu.uts.lib/ppc
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	Wastewater treatment.	en
dc.subject	Effluent organic matter (EfOM).	en
dc.subject	Crossflow microfiltration (CFMF).	en
dc.subject	Submerged membrane adsorption hybrid system (SMAHS).	en
dc.subject	Flocculation.	en
dc.title	Microfiltration hybrid systems in wastewater treatment for reuse	en_US
dc.type	Thesis
utslib.copyright.status	open_access

Abstract:

Generally, the conventional wastewater treatment cannot remove all the effluent organic matter (EfOM) such as synthetic organic chemicals and natural organic matter etc. As a result, the biologically treated effluent from sewage treatment plant needs to undergo further advanced treatment processes. To obtain water of recyclable quality, initially physico-chemical processes such as flocculation, sedimentation, filtration and adsorption were normally used. However, with advanced technologies and ever increasing stringent water quality criteria, membrane processes are becoming more attractive in water reuse. Among different membrane processes, although microfiltration (MF) can be operated economically, it alone cannot remove organic matter. If MF is combined with an enhanced flocculation or/and adsorption, it will be able to reduce superior level of organic contaminants. The aims of this study are: (i) improving the dissolved organic removal and reduce membrane fouling of two membrane hybrid systems (crossflow microfiltration (CFMF) and submerged membrane adsorption hybrid system (SMAHS)) using different pretreatment methods (flocculation, adsorption and flocculation- adsorption); (ii) investigating the critical flux of a laboratory-scale CFMF with and without different pretreatments. The incorporation of powdered activated carbon (PAC) as pretreatment to CFMF resulted in high TOC removal efficiency (more than 80%) when the PAC-CFMF system was operated at a relatively high filtration flux of 250 L/m2.h. The incorporation of flocculation and PAC as pretreatments to CFMF process resulted in a very high TOC removal efficiency (99.7%) and a stable filtration flux during 5-hour filter run (less than 12% flux decline), when the hybrid system was operated at a higher filtration flux (270 L/m2.h). Application of membrane processes requires lower investment and operating costs. One of the ways is to operate system at a constant filtration flux below the critical flux. With both flocculation and adsorption as pretreatment to CFMF, the critical flux of biologically treated effluent increased dramatically (5-7 times increase). The preadsorption, PAC dose, aeration rate and filtration flux had effects both on organic matter removal efficiency and TMP development. The preadsorption of 1 hour prior to the membrane operation was important in mitigating the membrane fouling. The suitable aeration rate, filtration flux and initial PAC dosing were 16 L/min, < 24 L/m2.h and 5 g/L respectively for the wastewater used in this study. The long term SMAHS experiments conducted with regular PAC replacement indicated that the PAC replacement in PAC-MF reactor could stimulate both biological activity and adsorption, as well as optimize the operation of the hybrid system.

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