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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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The renewed interest in all things ‘circular’ by the rest of the world has encouraged a change in mindset between industrial wastewater treatment sectors in terms of collaboration and cooperation.
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There remain, it seems, two enduring conceptions concerning sludge or biomass incineration, namely: 1) incineration is less sustainable than anaerobic digestion or non-oxidative thermal methods, and 2) it's also more highly polluting than the alternatives.
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We’ve spent a few months now here at Qatar University looking at clogging in membrane channels, with our single-channel bench-scale plant.
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