Table 2 Overview of meta-data to be coded

Primary input(s)

e.g., urine, blackwater, sewage sludge ash, treated effluent

Process(es)

e.g., selective crystallization, hydrothermal liquefaction, sorption, membrane filtration, etc.

Product(s)

e.g., struvite, ammonium sulfate, algal biomass, etc.

Commercial name of process

e.g., NuReSys, DHV Crystallactor, etc.

Where applicable

Commercial name of product

e.g., Aurin, Crystal Green, etc.

Where applicable

Author affiliation country and location

Country and city, including longitude and latitude of the city

Study location

Country and city, including longitude and latitude of the city

Where applicable

Study scale

Lab, bench, pilot, or full scale

For experimental studies only

Study type

Recovery process, recovery product, reuse in agriculture, sustainability assessment, user acceptance

Research type

Primary (experimental or modelling studies) or secondary (literature reviews)

Publication source

Bibliographic databases, Google Scholar, additional searches, other