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Table 4 The 12 most common combinations of ecotechnologies and the recovered or reused substance(s) (n = 45)

From: What evidence exists on ecotechnologies for recycling carbon and nutrients from domestic wastewater? A systematic map

Combination E P N C & E P & N E & P C & P E, P & N C, P & N E, C & P E, C, P & N Total
Microalgae cultivation -> Anaerobic digestion         11     11
Anaerobic digestion -> Microalgae cultivation         6    1 7
Microalgae cultivation -> HTLa         4     4
Adsorption -> Reuse of biocharb   2 1   1        4
Pyrolysis -> Reuse of biocharb     1       3   4
Incineration -> Thermal ash recovery   3     1       4
Adsorption -> Microalgae cultivation   2    1        3
Composting -> Reuse of biosolidsc          3    3
Adsorption -> Struvite precipitation      2        2
Struvite precipitation -> Microbial fuel cell      1    1     2
Pyrolysis -> Adsorption        1   1    2
Membrane filtration -> Microbial fuel cell 2            2
  1. Total number of studies of combinations is 79
  2. aHydrothermal liquefaction
  3. b/biocoal/adsorption medium
  4. c/sludge/compost