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| Enhancement of microalgae culture in anaerobic fermentation liquid of swine wastewater by algal –bacteria symbiotic system |
| Received:September 19, 2020 |
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| KeyWord:fermentation liquid of swine wastewater;Chlorella vulgaris;activated sludge;algal-bacteria symbiotic system;microalgae culture;wastewater resource treatment |
| Author Name | Affiliation | E-mail | | QIAN Rui | College of Engineering, Shanghai Polytechnic University, Shanghai 201209, China | | | LIU Hui | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | XU Huiting | College of Engineering, Shanghai Polytechnic University, Shanghai 201209, China | | | MA Changwen | College of Engineering, Shanghai Polytechnic University, Shanghai 201209, China | | | CHEN Hao | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | LIANG Junyu | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | YE Jianfeng | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | yejf99@gmail.com |
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| Abstract: |
| The cultivation of microalgae using an anaerobic fermentation solution of swine wastewater（FS-SW）is a potential wastewater recycling technology. The improvement in the yield of microalgae is a popular research topic in this field. In this study, the FS-SW was used to cultivate microalgae while activated sludge was added to form an algal–bacteria symbiotic system. The key technological parameters （i.e., algal bacteria ratio, microalgae inoculation concentration, and illumination）were optimized to explore the optimal conditions of the algal–bacteria symbiotic system for microalgae harvest and nitrogen and phosphorus recovery, and the related mechanisms were analyzed. The results showed that the algal–bacteria symbiotic system was more beneficial to microalgae accumulation and nitrogen and phosphorus recovery with the proper algae bacteria ratio（1∶0.2）. The algal–bacteria symbiotic reactor and pure algae-cultivation reactor were set up and further operated under the optimal inoculum and light conditions. Evidently, the algal-bacteria symbiotic system was beneficial to supplying multiple carbon sources for the macroalgae and maintain the pH of the system, thereby improving the maximum microalgae yield. When the hydraulic retention time（HRT）was set to 2 days, the microalgae biomass（0.16 g·L-1·d-1）harvest increased by 117% than that of the pure algae-cultivation reactor. In addition, secondary growth of the microalgae and high wastewater treatment efficiency were obtained when the HRT was set to 12 days. |
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