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The influence of light intensity and organic content on cultivation of Chlorella vulgaris in sludge extracts diluted with BG11
Aquaculture International ( IF 2.9 ) Pub Date : 2021-06-25 , DOI: 10.1007/s10499-021-00740-3
Xiurong Chen , Yingying Yang , Quanling Lu , Xiaoli Sun , Shanshan Wang , Qiuyue Li , Xiao Wei , Yuan Wang

The cultivation of Chlorella vulgaris in sludge extract (SE) from municipal excess sludge diluted with BG11 medium was investigated to achieve sludge reduction and microalgae cultivation. A maximum biomass of 1.404 ± 0.101 g/L was achieved at 15 days in a mixture of 25% BG11 and 75% sludge extract under 10,000-lx light. In early culture periods, heterotrophy dominated the process in the group with a high proportion of sludge extract of excess sludge extract containing relatively high amounts of organic material, which led to enhanced citrate synthase enzyme activities and reduced rubisco enzyme activities. Moreover, increasing the light intensity did not significantly improve biomass production due to its inhibitory effects on respiration in the early culture stages. The response surface model showed that organic matter was the main factor influencing biomass production from 0 to 2 days. The influence of light intensity on biomass production became more noticeable only after depleting the organic matter in sludge extract.



中文翻译:

BG11稀释污泥提取物中光照强度和有机物含量对小球藻培养的影响

小球藻的栽培研究了用 BG11 培养基稀释的城市剩余污泥的污泥提取物 (SE) 以实现污泥减量和微藻培养。在 25% BG11 和 75% 污泥提取物的混合物中,在 10,000-lx 光下,15 天的最大生物量达到 1.404 ± 0.101 g/L。在早期培养阶段,异养在该组中占主导地位,污泥提取物的污泥提取物比例较高,其中有机物含量相对较高,这导致柠檬酸合酶活性增强,而 rubisco 酶活性降低。此外,由于在早期培养阶段对呼吸有抑制作用,增加光照强度并没有显着提高生物质产量。响应面模型表明有机质是影响0~2天生物量生产的主要因素。只有在耗尽污泥提取物中的有机物后,光照强度对生物质产生的影响才变得更加明显。

更新日期:2021-06-25
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