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| The treatment of piggery biogas slurry with Scenedesmus sp. by attached culture |
| Received:November 25, 2016 |
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| KeyWord:Scenedesmus sp.;attached culture;swine wastewater;lipid product;treatment |
| Author Name | Affiliation | E-mail | | CHENG Peng-fei | School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China
Poyang Lake Eco-economy Research Center of Jiujiang University, Jiujiang 332005, China | | | PAN Lu | School of Architectural and Environment, Hubei University of Technology, Wuhan 430072, China | | | WANG Yuan-zhu | School of Water Conservancy and Environment, China Three Gorges University, Yichang 443002, China | | | LIU Tian-zhong | Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China | | | LIU De-fu | School of Architectural and Environment, Hubei University of Technology, Wuhan 430072, China | dfliu@189.cn |
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| Abstract: |
| The current study investigated the treatment of swine (piggery) wastewater with Scenedesmus sp. by using attached cultivation technique, coupled with lipid production. Firstly, we compared the attached culture of Scenedesmus sp. with aqueous-suspension cultivation in BG11 medium, and studied the growth of algae and nitrogen removal efficiency. Results showed that the biomass productivity of Scenedesmus sp. with attached culture was 6.15 g·m-2·d-1, as compared with the 5.48 g·m-2·d-1 of the aqueous-suspension cultivation. The nitrogen removal efficiency of the attached culture was also significantly higher than that of the aqueous-suspension cultivation, which were 85.23% and 77.84%, respectively. In addition, results showed that Scenedesmus sp. could grow well in swine wastewater at light intensity of 100 μmol·m-2·s-1 and temperature of (25±1) ℃. Compared with algae cultured in BG11 medium, the biomass productivity and lipid content were 6.26 g·m-2·d-1 vs 6.23 g·m-2·d-1 and 34.6% vs 35.2%, respectively. Notably, Scenedesmus sp. with attached culture could treat swine wastewater efficiently, with ammonia nitrogen, total phosphorus (TP) and COD removal efficiency of 99.04%, 73.06% and 72.32%. Based on the results, a process combining algae-based wastewater treatment with attached cultivation and biodiesel production can be proposed as an effective way to treat raw swine wastewater as well as produce profitable byproducts. |
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