| Title | Source separation and anaerobic co-digestion of blackwater and food waste for biogas production and nutrient recovery |
|---|---|
| ID_Doc | 12320 |
| Authors | Kamravamanesh, D; Kokko, M |
| Title | Source separation and anaerobic co-digestion of blackwater and food waste for biogas production and nutrient recovery |
| Year | 2024 |
| Published | Water Science And Technology, 90.0, 3 |
| Abstract | Anaerobic co-digestion of source-separated blackwater (BW) and food and kitchen waste (FW) offers decentralized circular economy solutions by enabling local production of biogas and nutrient-rich byproducts. In this study, a 2 m(3) pilot-scale continuously stirred tank reactor (CSTR) operated under mesophilic conditions was utilized for co-digestion of BW and FW. The process obtained a CH4 yield of 0.7 +/- 0.2 m(3)/kg influent-volatile solid (VS), reaching a maximum yield of 1.1 +/- 0.1 m(3)/kg influent-VS, with an average organic loading rate of 0.6 +/- 0.1 kg-VS/m(3)/d and HRT of 25 days. The CH4 production rate averaged 0.4 +/- 0.1 m(3)/m(3)/d, peaking at 0.6 +/- 0.1 m(3)/m(3)/d. Treatment of digestate through flocculation followed by sedimentation recovered over 90% of ammonium nitrogen and potassium, and 80-85% of total phosphorus in the liquid fraction. This nutrient-rich liquid was used to cultivate Chlorella vulgaris, achieving a biomass concentration of 1.2 +/- 0.1 g/L and 85 +/- 3% and 78 +/- 5% ammonium nitrogen and phosphorus removal efficiency, respectively. These findings not only highlight the feasibility of anaerobic co-digestion of source-separated BW and FW in local biogas production but also demonstrate the potential of microalgae cultivation as a sustainable approach to converting digestate into nutrient-rich algae biomass. |
| https://doi.org/10.2166/wst.2024.251 |
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