沉淀
絮凝作用
制浆造纸工业
普通小球藻
光合反应器
生物量(生态学)
生物燃料
曝气
生产力
悬挂(拓扑)
体积热力学
化学
环境工程
植物
环境科学
藻类
生物
数学
生物技术
农学
工程类
宏观经济学
有机化学
物理
量子力学
同伦
经济
纯数学
作者
Syahirah Faraheen Kabir Ahmad,K. Vengatajalabathy Gobi,Keat Teong Lee,Vel Murugan Vadivelu
标识
DOI:10.1016/j.algal.2024.103505
摘要
Microalgae is widely utilized in water purification technology, biofuel production as well as in the synthesis of biopolymers. However, the separation of microalgae from its growth medium is the major issue that restricts the harvesting processes due to microalgae's lower density. In this study, the effect of environmental factors on microalgae granules development was investigated. Results from response surface methodology (RSM) revealed that maximum growth rate and biomass productivity were obtained at a photoperiod of 23.9 h, aeration rates of 2.4 L/min, inoculum concentration of 11 % and pH 6 respectively. The mixed liquor volatile suspended solids (MLVSS) value of the initial seed microalgae increased from 50 mg/L to 2978 mg/L after 70 days of cultivation. Microalgae productivity in this study is approximately 2 times faster than the standard suspension growing method. The microalgae settleability was significantly enhanced, as indicated by a major reduction in the sludge volume index (SVI30) from an initial value of >3000 to 58.51 mL/g, accompanied by an increase in settling velocity from virtually 0 to 19.2 cm/h and total harvesting time of 15 min. After 70 days of operation, smoothly settled, compact algal granules with largest sizes of 1.90 mm were obtained.
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