Table 2.
Life cycle inventory of each stage.
| Process | Inputs | Outputs | ||||
|---|---|---|---|---|---|---|
| Flows | Regional datasets | Amount | Flows | Amount | ||
| CBPG preparation | Coal fly ash | RoW | 0.8 kg | CBPG, produced | 1 kg | |
| Sodium silicate | RoW | 0.23016 kg | ||||
| NaOH | RoW | 0.09072 kg | ||||
| H2O2 | RoW | 0.02664 kg | ||||
| Olive oil | GLO | 0.0184 kg | ||||
| Deionized water | RoW | 0.24 kg | ||||
| Electricity | CN, XJ | 0.24 kWh | ||||
| Transport, lorry | RoW | 0.2576 tkm | ||||
| Transport, train | CN | 1.0302 tkm | ||||
| Adsorption | Pb2+ | CBPG, produced | / | 3.78E-6 kg | Pb2+ removed | 1 mg |
| Electricity | CN, XJ | 4.73E-4 kWh | CBPG spent | 3.78E-6 kg | ||
| MB | CBPG, produced | / | 1.52E-5 kg | MB removed | 1 mg | |
| Electricity | CN, XJ | 8.45E-4 kWh | CBPG spent | 1.52E-5 kg | ||
| CBPG spent landfill | Transport, lorry | RoW | 0.025 tkm | CBPG spent | 1 kg | |
| Hazardous waste, for underground deposit | / | 1 kg | ||||
(Notes: Electricity consumption is based on the low-voltage electricity mix from the openLCA background database. Transportation distances in Xinjiang were estimated according to laboratory-scale procurement conditions with an assumed 80% railway and 20% road transport structure.)