Your browser doesn't support javascript.
loading
Fluidized bed photobioreactor based on diatomite powder and high light intensity improved microalgae harvesting, nutrient removal and lipid accumulation: Performance and microscopic mechanism.
Xu, Haolian; Wang, Hong; Wang, Xiankai; Tang, Zhenzhen; Chen, Xiang; Chen, Yongdong; Dai, Xiaohu; Chen, Hongbin; Wang, Hang.
Afiliación
  • Xu H; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
  • Wang H; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
  • Wang X; YANGTZE Eco-Environment Engineering Research Center, China Three Gorges Corporation, Wuhan 430010, China; National Engineering Research Center of Eco-environment Protection for Yangtze River Economic Belt, China Three Gorges Corporation, Wuhan 430010, China.
  • Tang Z; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
  • Chen X; YANGTZE Eco-Environment Engineering Research Center, China Three Gorges Corporation, Wuhan 430010, China; National Engineering Research Center of Eco-environment Protection for Yangtze River Economic Belt, China Three Gorges Corporation, Wuhan 430010, China.
  • Chen Y; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
  • Dai X; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: daixiaohu@tongji.edu.cn.
  • Chen H; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: bhctxc@tongji.edu.cn.
  • Wang H; YANGTZE Eco-Environment Engineering Research Center, China Three Gorges Corporation, Wuhan 430010, China; National Engineering Research Center of Eco-environment Protection for Yangtze River Economic Belt, China Three Gorges Corporation, Wuhan 430010, China.
Water Res ; 264: 122172, 2024 Oct 15.
Article en En | MEDLINE | ID: mdl-39146848
ABSTRACT
Cultivation of microalgae using anaerobic digestate is a gain-win strategy for algal biomass production and achieving environmental benefits. However, the low biomass concentration and high harvest cost of the conventional suspended microalgae culture system are troublesome issues. In this study, a novel fluidized bed photobioreactor (FBPBR) based on diatomite powder was constructed for cultivating Scenedesmus quadricauda and treating diluted anaerobic digestate. The optimized diatomite carrier dosage of 750 mg/L increased microalgal biomass concentration to 1.58 g/L compared to suspended microalgae without carrier (0.99 g/L). When the light intensity was increased from 100 to 200 µmol/m2/s, the microalgal biomass in the FBPBR increased to 1.84 g/L and the settling efficiency increased to 93.58 %. This was due to the 1.60-fold enhancement of extracellular polymeric substance (EPS) secretion and changes in EPS properties. The increase in hydrophobic functional groups of EPS under high light intensity, coupled with the reconstitution of protein secondary structure, facilitated the initial attachment of algae to diatomite and the thickening of microalgal biofilm. Moreover, transcriptomic analysis demonstrated that diatomite promoted antioxidant defense and photosynthesis in S. quadricauda cells, alleviating the adverse effect of anaerobic digestate stress. The diatomite addition and elevated light intensity contributed to the highest lipid content (60.37 %), which was owing to the upregulated genes encoding fatty acid and triacylglycerol synthesis under the stress of localized nutrient starvation in the inner layer of microalgae biofilms. Furthermore, the regulation of phosphorus metabolism and NH4+-N assimilation improved nutrient removal (93.24 % and 96.86 % for NH4+-N and TP removal). This work will provide guidance for the development of FBPBR based on diatomite powder.
Asunto(s)
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Microalgas / Fotobiorreactores / Tierra de Diatomeas Idioma: En Revista: Water Res Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Microalgas / Fotobiorreactores / Tierra de Diatomeas Idioma: En Revista: Water Res Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido