Fig. 4From: What evidence exists on ecotechnologies for recycling carbon and nutrients from domestic wastewater? A systematic mapThe number of studies per category (n = 28) of ecotechnology in the evidence base (n = 474). Blue represents recovery ecotechnologies and orange represent reuse ecotechnologies. *biosolids/sludge/compost, **other than struvite, ***directly in substrate other than microalgae, ****biochar/biocoal/adsorption mediumBack to article page