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Nutrient starvation and light depravation effects on starch accumulation in landolita punctata cultivated on anaerobically digested dairy manure
Journal of Environmental Quality ( IF 2.4 ) Pub Date : 2020-06-03 , DOI: 10.1002/jeq2.20092
Kevin Kruger 1 , Lide Chen 1 , B. Brian He 2
Affiliation  

Duckweed has been recognized for its potential of producing biomass on nutrients from waste streams. Our research has shown that strains of duckweed can be successfully cultivated on anaerobically digested (AD) dairy manure under controlled levels of nitrogen (N) and phosphorus (P). The objective of this study was to explore the maximization of starch accumulation in Landoltia punctata (Mey.) Les & Crawford strain 0128 under different cultivation conditions using AD dairy manure as the nutrient source. Experimental results have shown that the most influential factors for starch accumulation in L. punctata were the nutrient concentration and the appropriate scheduling of nutrient starvation at the right growth stages. In our study, nutrient starvation for starch accumulation in L. punctata was achieved by incorporating nutrient addition of appropriately diluted AD dairy manure sequentially in a controlled manner under a constant light intensity of 3,000 lx. It was observed that a starch concentration of 30% (w/w) within the L. punctata biomass was achieved with an initial total N of 57.1 mg L-1 and a total P of 6.7 mg L-1 after a 30-d cultivation. Under the abovementioned cultivation conditions, the duckweed L. punctata recovered 16.3% (±4.0%) of total N and 25.9% (±6.6%) of total P from AD manure into its biomass. It is concluded that L. punctata can be successfully cultivated on nutrients from dairy manure for starch production, which would achieve well-being for dairy farmers by producing a feedstock for biofuels while treating dairy wastewater in an environmentally friendly manner.

中文翻译:

厌氧消化乳粪中的Landolita punctata中的营养饥饿和光破坏对淀粉积累的影响

浮萍因其利用废物流中的营养物质生产生物质的潜力而得到认可。我们的研究表明,在控制氮 (N) 和磷 (P) 水平的情况下,浮萍菌株可以在厌氧消化 (AD) 牛粪上成功培养。本研究的目的是探索在不同栽培条件下使用 AD 乳粪作为营养源的 Landoltia punctata (Mey.) Les & Crawford 菌株 0128 中淀粉积累的最大化。实验结果表明,对点状斑马线虫淀粉积累影响最大的因素是养分浓度和适当的生长阶段养分饥饿的适当安排。在我们的研究中,L. 淀粉积累的营养饥饿。通过在 3,000 lx 的恒定光强度下以受控方式依次加入适当稀释的 AD 乳制品肥料的养分来实现 punctata。据观察,L. punctata 生物质中淀粉浓度为 30% (w/w),初始总 N 为 57.1 mg L-1,培养 30 天后总 P 为 6.7 mg L-1 . 在上述培养条件下,浮萍从 AD 粪便中回收了 16.3% (±4.0%) 的总氮和 25.9% (±6.6%) 的总磷,转化为生物量。得出的结论是,L. punctata 可以成功地从乳粪中的营养物质中培养用于淀粉生产,这将通过生产生物燃料的原料同时以环保的方式处理乳业废水来实现奶农的福祉。
更新日期:2020-06-03
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