| Title |
Enhanced microalgae cultivation using wastewater nutrients extracted by a microbial electrochemical system |
| ID_Doc |
12267 |
| Authors |
Wang, ZX; Hartline, CJ; Zhang, FZ; He, Z |
| Title |
Enhanced microalgae cultivation using wastewater nutrients extracted by a microbial electrochemical system |
| Year |
2021 |
| Published |
|
| DOI |
10.1016/j.watres.2021.117722 |
| Abstract |
Cultivating algae using wastewater nutrients is a potential approach to realize resource recovery that can contribute to circular economy. However, growing algae directly in a wastewater has problems such as bacterial contamination and a low biomass density. To address those problems, we investigated microalgal cultivation in a photobioreactor (PBR) fed with the nutrients extracted from wastewater by a microbial nutrient recovery cell (MNRC). With an external voltage of 0.3 V, the MNRC-PBR system removed 96% of COD and recovered 44% of NH4+-N and 39% of PO43--Pat a hydraulic retention time of 7.2 h. Microalgae cultivated in the nutrient recovery medium from the MNRC had 8.3-fold biomass density and 1.4-fold lipid contents, versus that cultivated in a food wastewater containing more nutrients. More significantly, 90% of biomass yielded from the MNRC-PBR system was microalgae, much higher than similar to 30% in the food wastewater. A liquid exchange ratio of 30% achieved the highest microalgal density of 0.61 +/- 0.06 g L-1, comparable to that in a standard BG11 medium. There was a tradeoff between recycling PBR medium and microalgal growth. The accumulated salinity was observed in the extended operation of the MNRC-PBR system treating an actual food wastewater. The results of this study have demonstrated an effective approach to extract nutrients from wastewater for enhanced microalgal growth and improved biomass quality. |
| Author Keywords |
Nutrient removal and recovery; Wastewater treatment; Microbial electrochemical; Microalgae; Resource recovery |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000713194100007 |
| WoS Category |
Engineering, Environmental; Environmental Sciences; Water Resources |
| Research Area |
Engineering; Environmental Sciences & Ecology; Water Resources |
| PDF |
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