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The discharge of PFAS from the polymerisation stage of PVDF membrane production is likely to lead to a future ban on PVDF fabrication, despite improvements in manufacturing practices and implementation of more aggressive effluent treatment technologies.
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Pilot-scale trials by PUB Singapore have demonstrated the benefits of combining MABR and MBR technologies for treating municipal wastewater. Energy consumptions below 0.25 kWh/m3 have been recorded with membrane permeabilities sustained above 200 LMH/bar.
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The Glenmorangie distillery near Tain in Scotland uses a sidestream anaerobic MBR for treating its effluent. The process results in the biological generation of methane, which is recovered and used to produce energy for use in the distillery process.
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Anaerobic MBRs offer a low-energy means of treating municipal wastewater to produce a permeate product which meets various national and international standards for a number of reuse applications, although careful management of the biogas methane is needed.
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The EU's Urban Wastewater Treatment Directive aims to achieve energy neutrality without impacting on greenhouse gas emissions, but this presents a significant challenge when considering the fate of nitrous oxide and methane in low-energy process options.
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Modeling platforms allow comparative analysis of wastewater processes in terms of their carbon footprint and energy consumption. Analysis of the CAS, MBBR and MBR technologies using the Transcend platform provides quantitative data for these key parameters
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The Water Resource Recovery Facility (WRRF) at San Luis Obispo is an example of an upgrade of a classical activated sludge (CAS)-based treatment scheme to an MBR with downstream UV disinfection to provide treated water suitable for reuse in irrigation.
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Outcomes of a nine-year pilot plant trial along with one year of full-scale operation of the MBR at Henriksdal WwTP are presented. Data include long-term permeability trends, nutrient removal, cleaning optimisation, micropollutant fate and foaming control.
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PFAS emissions vary in concentration and effluent volume across the different stages of the the PVDF membrane life cycle. While there is no evidence of significant emissions during the use stage, emissions from fabrication and disposal have been reported.
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Dennis Livingston and Simon Judd answer a range of questions on the design, operation & maintenance, applications (municipal and industrial, including reuse), troubleshooting, and general characteristics of MBR technology as used for wastewater treatment.
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What commercially-available tubular (or multi-tube) membrane products are used in sidestream MBRs for treating wastewater? What are the characteristics of the membranes, and how does the footprint of the membrane component compared with immersed sysems?
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Five examples of novel or innovative municipal wastewater and sludge treatment technologies aimed at meeting the global sustainability challenge, including anaerobic treatment, hydrothermal carbonisation, phosphate recovery, annamox and photobioreactors.
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