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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