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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Wastewater Utilization for Poly-β-Hydroxybutyrate Production by the Cyanobacterium Aulosira fertilissima in a Recirculatory Aquaculture System
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Wastewater Utilization for Poly-β-Hydroxybutyrate Production by the Cyanobacterium Aulosira fertilissima in a Recirculatory Aquaculture System

机译：循环水产养殖系统中费氏蓝藻生产聚β-羟基丁酸酯的废水利用

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Intensive aquaculture releases large quantities of nutrients into aquatic bodies, which can lead to eutrophication. The objective of this study was the development of a biological recirculatory wastewater treatment system with a diazotrophic cyanobacterium, Aulosira fertilissima, and simultaneous production of valuable product in the form of poly-β-hydroxybutyrate (PHB). To investigate this possible synergy, batch scale tests were conducted under a recirculatory aquaculture system in fiber-reinforced plastic tanks enhanced by several manageable parameters (e.g., sedimentation, inoculum size, depth, turbulence, and light intensity), an adequate combination of which showed better productivity. The dissolved-oxygen level increased in the range of 3.2 to 6.9 mg liter−1 during the culture period. Nutrients such as ammonia, nitrite, and phosphate decreased to as low as zero within 15 days of incubation, indicating the system's bioremediation capability while yielding valuable cyanobacterial biomass for PHB production. Maximum PHB accumulation in A. fertilissima was found in sedimented fish pond discharge at 20-cm culture depth with stirring and an initial inoculum size of 80 mg dry cell weight (dcw) liter−1. Under optimized conditions, the PHB yield was boosted to 92, 89, and 80 g m−2, respectively for the summer, rainy, and winter seasons. Extrapolation of the result showed that a hectare of A. fertilissima cultivation in fish pond discharge would give an annual harvest of ∼17 tons dry biomass, consisting of 14 tons of PHB with material properties comparable to those of the bacterial polymer, with simultaneous treatment of 32,640 m3 water discharge.
机译：集约化水产养殖将大量养分释放到水体中，这可能导致富营养化。这项研究的目的是开发一种带有重氮营养性蓝细菌Aurosira fertilissima的生物循环废水处理系统，并同时生产聚-β-羟基丁酸酯（PHB）形式的有价值的产品。为了研究这种可能的协同作用，在循环水产养殖系统下，对纤维增强的塑料罐进行了批量试验，这些塑料罐具有几个可管理的参数（例如，沉降，接种量，深度，湍流和光强度），这些参数的适当组合表明更高的生产率。在培养期间，溶解氧水平增加到3.2至6.9 mg升 -1 。在孵化后的15天内，诸如氨，亚硝酸盐和磷酸盐之类的营养素降至低至零，表明该系统具有生物修复能力，同时可产生用于PHB生产的有价值的蓝细菌生物质。在搅拌下，初始接种量为80 mg干细胞重量（dcw）升 -1 的20 cm养殖深度的沉积鱼塘排放物中，发现了A. fertilissima中的最大PHB积累。在最佳条件下，夏季，雨季和冬季，PHB产量分别提高到92、89和80 g m -2 。结果的推断表明，在鱼塘排放中种植一公顷的A. fertilissima将使每年收获约17吨干生物质，其中包括14吨PHB，其材料特性与细菌聚合物相当，同时进行32,640 m 3 排水。

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