and bogs flow via the sewerage network to treatment vegetation. The Spernal test bed will experiment with phosphorus and nitrogen recovery – utilizing a second ion trade expertise to recuperate nitrogen – in combination with an anaerobic membrane bioreactor that generates biogas.3 Standing in front of his empty slab, Vale tries to envisage how this will look. ‘The major organic reactor won’t look too dissimilar to the activated sludge,’ he says, indicating the aerated tanks we saw effervescent away earlier. ‘Probably in a taller tank. But somewhat than blow air into it, you simply have the sewage coming in at the backside and micro organism which
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