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In February 2015, we asked you to contribute to our MBR survey with a view to sharing knowledge and experiences about the common technical issues that prevent MBRs working as they should, as well as your views about the future for MBR technology.
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Anaerobic MBRs provide the potential for removing COD with a net energy benefit from the methane generated, albeit without nutrient removal. To date, five independent reviews of the subject have been published in various learned journals in 2012 alone.
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In Japan, over 3,000 MBRs have been in operation since the 1980s for small-scale on-site industrial/household wastewater treatment. Municipal wastewater applications began in the mid 00’s, with 19 operational full-scale plants by April 2013.
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Trace organic contaminants in municipal wastewater consist of a range of naturally occurring and synthetic chemicals - industrial chemicals, and those chemicals used in households, excreted by people, and formed during wastewater/water treatment processes.
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It is widely recognised by practitioners that clogging phenomena – possibly related to inefficient pre-treatment – are at least as important as membrane surface fouling in MBR systems. It is also recognised that clogging takes different forms...
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This feature summarises research into a new MBR technology applied for water reuse (NEWater, Singapore) with reference to energy demand. Reducing aeration demand for membrane air scouring combined with a high flux has been shown to reduce energy demand.
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Biological nitrogen removal from wastewater typically happens through aerobic nitrification (ammonia to nitrate) and anoxic denitrification (nitrate to nitrogen gas), usually in two separate process tanks other than in sequencing batch reactors (SBRs).
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The non-Newtonian nature of sewage sludge means that its measured viscosity µs varies with shear rate due to the shear-dependent deformation of the flocculant solids. Viscosity affects the shear at the membrane interface ...
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The ‘recirculating aquaculture system’ (RAS) is an upcoming production system in intensive fish production, where over 90% of the water is recycled for production of live feed, larvae and fry and on-growing fish.
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Arenales del Sol WWTP in Spain combines biological treatment with nutrient removal using a submerged MBR system fitted with flat sheet (FS) ultrafiltration membranes, and has an average treatment capacity of 10,000 m3/d (10 MLD).
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In our 2012 MBR survey, we asked for the views of a range of MBR stakeholders regarding the perceived technical challenges facing MBRs: What is the main technical problem that prevents MBRs working as they should?
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When routine maintenance membrane cleans fail to achieve the required recovery, and more aggressive recovery cleans are also found wanting, ex-situ cleaning becomes necessary. This incurs extensive manual intervention, not always with guaranteed success.
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