• MBR Screening Part 2: Selecting an MBR screen

    Key facets to take into account when selecting a screen for your MBR design include the screenings capture ratio, screen apertures, screening flow velocity, ancillary processes and coarse suspended solids, and screen maintenance. The screenings capture ratio (SCR) represents the amount of solids removed by the screen as a proportion of the total coarse solids load, and as such is analogous to membrane rejection. Its value is dependent on both the rating and rotation speed of the screen, as well as on the velocity of the wastewater travelling through it. ... Read more

  • MBR Screening Part 1: MBR screen designs and performance – an overview

    The importance of screening upstream of a membrane bioreactor has been widely acknowledged since the early pilot trials by DHV in the Netherlands (van der Roest et al., 2002) and remains a key concern for MBR practitioners today. Screening protects the membrane from mechanical damage from sharp or abrasive particles and from clogging from hair and matted cotton fibre. While any screen is better than no screen at all, it is critically important to have a properly designed and sized screening system to limit the screen cleaning frequency ... Read more

  • How much does an MBR cost? The relative cost of an MBR vs an SBR

    Operational experience at La Center WWTP in Washington, USA indicates that the cost of MBR technology may be lower than that of a conventional biological treatment process, despite the higher energy demand. La Center is a small city in Clark County, Washington, USA, with a population of 3,100. The wastewater treatment works at the town was originally constructed in 1967 ... Read more

  • Effects of ferric and ferrous iron addition on membrane bioreactor effluent quality

    Municipal wastewater usually contains between 4 and 12 mg/L total phosphorus (TP) concentrations in the range 4-12 mg/L. A conventional activated sludge process (CAS) can take this down to 2-4 mg/L, or 0.5-1 mg/L if an enhanced biological phosphorus removal (BPR) process is used (Fig. 1). To achieve the sort of levels required to suppress eutrophication, however, demands P levels of 0.01-0.3 mg/L ... Read more

  • The 2015 MBR Survey results

    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 ... Read more

  • Immersed anaerobic MBRs: are they viable?

    There has been a recent surge of interest in anaerobic MBRs. The technology provides the potential for removing COD with a net energy benefit from the methane generated, albeit without nutrient removal. Interest within academia is evidenced by the publication of five independent reviews of the subject in various learned journals in 2012 alone. ... Read more

  • Survey of Japanese municipal MBRs

    In Japan, there are over 3,000 MBRs which have been in operation since the 1980s for small-scale on-site industrial/household wastewater treatment. However, municipal wastewater applications began only in the mid 00’s, leading to 19 operational full-scale plants by April 2013 ... Read more

  • Removal of Emerging Trace Organic Contaminants (TrOCs) by MBR

    Trace organic contaminants (TrOCs) in municipal wastewater consist of a wide range of naturally occurring and synthetic chemicals (Luo et al., 2014). They include industrial chemicals, chemicals used in households, chemicals excreted by people, and chemicals formed during wastewater and drinking-water treatment processes. ... Read more

  • Ragging in immersed hollow fibre membrane bioreactors

    While most scientific articles about MBR systems suggest membrane surface fouling as being the main operational limitation for the technology, it is widely recognised by practitioners that clogging phenomena – possibly related to inefficient pre-treatment – are at least as important. It is also recognised that clogging takes different forms ... Read more

  • Membrane bioreactor (MBR) performance for reducing energy demand

    This feature summarises recent research into a new membrane bioreactor 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 significantly reduce energy demand. A demonstration study has been carried out ... Read more

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