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Announcement of Special Issue of Membranes journal commemorating Simon Judd. Submissions are invited of research papers in the general area of membrane process technology for water and wastewater treatment
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Can the water industry survive without PVDF membranes? And should it be forced to lose its preferred material for water and wastewater treatment? PVDF is the material of choice for MBR membranes, but its future could be determined by EU PFAS legislation.
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Sludge intensification processes increase the sewage sludge solids concentration through thickening/dewatering or the biogas generation by digestion. But at what point do you stop extracting more water from the sludge or enhancing biogas production?
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Academic research into MBRs has been dominated by studies of membrane fouling and foulant characterisation. Key topics, such as process failure risk, chemical cleaning impacts on membrane life, and pretreatment requirements, have been largely overlooked.
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The ever-decreasing supply of freshwater has led to revisiting of the subject of wastewater reclamation generally. Should we be building larger reservoirs and focus on recovering the water following its domestic or industrial use?
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The MFC-MBR technology offers potential for low-energy wastewater treatment. But it is unclear how much latent electrical energy can be recovered from the wastewater and the cost is of retrofitting the MFC components to an existing MBR technology.
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The UK regulator OFWAT has introduced legislation based on the notion of sludge as a resource. Its value is often expressed in terms of calorific content, and the phosphate is also potentially recoverable. But how exactly should sludge value be quantified?
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For the mechanical parameters of mass, length, time, flow rate, density, viscosity, force, pressure, energy and power, adherence to US units imposes unnecessary barriers in understanding their inter-relationships based on the governing physical laws.
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Pre-1970s, water regulation was about rights, to control excessive pollution. 1970-2000, there was a push to protect water sources from pollution. Since 2000, the watchwords have been sustainability and climate change but there is still some way to go.
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Abbreviations like MABR, MBBR and MBR suggest these technologies are pretty similar, but actually they refer to completely different things. Let’s face it, the acronyms do kind of suggest they are related − so we define the terms in our handy table.
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Biosolids are usually considered to be the useful fraction of the sewage sludge. They are generally higher in solids concentration and lower in pathogen content, having gone through a stabilisation process such as chemical dosing, digestion and/or drying.
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Two significant micropollutants are microplastics and per- and polyfluoroalkyl substances (PFAS), and these substances are already causing water utilities to rethink their biosolids strategies, encouraging a change in mindset among industrial sectors.
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