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首页> 外文期刊>International Biodeterioration & Biodegradation >Influence of light intensity on bacterial nitrifying activity in algal-bacterial photobioreactors and its implications for microalgae-based wastewater treatment
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Influence of light intensity on bacterial nitrifying activity in algal-bacterial photobioreactors and its implications for microalgae-based wastewater treatment

机译：光照强度对藻类细菌生物反应器中细菌硝化活性的影响及其对微藻类废水处理的影响

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The influence of irradiance on the nitrifying activity in photobioreactors of a bacterial consortium enriched from a wastewater treatment bioreactor was assessed using independent ammonium oxidation kinetic batch tests and respirometric assays. Culture irradiance below 250 mu mol m(-2) s(-1) did not show a significant effect on nitrification activity, while irradiance at 500 and 1250 mu mol m(-2) s(-1) caused a decrease of 20 and 60% in the specific total ammonium nitrogen removal rates and a reduction of 26 and 71% in the specific NO3- production rates, respectively. However, no significant influence of irradiance on the affinity constant of NH4+ oxidation was observed. The increasing nitrite accumulation at higher light intensities suggested a higher light sensitivity of nitrite oxidizers. Additionally, NH4+ oxidation respirometric assays showed a decrease in the oxygen uptake of 14 and 50% at 500 and 1250 mu mol m(-2) s(-1), respectively. The experimental determination of the light extinction coefficient (lambda) of the nitrifying bacterial consortium (lambda = 0.0003 m(2) g(-1)) and of Chlorella sorokiniana (lambda = 0.1045 m(2) g(-1)) allowed the estimation of light penetration in algal-bacterial high rate algal ponds, which showed that photo inhibition of nitrifying bacteria can be significantly mitigated in the presence of high density microalgal cultures. 2016 Elsevier Ltd. All rights reserved.
机译：使用独立的铵氧化动力学批处理试验和呼吸测定法评估辐照度对从废水处理生物反应器中富集的细菌财团的光生物反应器中硝化活性的影响。低于250μmol m（-2）s（-1）的培养物辐照度未显示对硝化活性的显着影响，而在500和1250μmol m（-2）s（-1）处的辐照度引起的硝化活性降低20和。特定的总氨氮去除率达到60％，特定的NO3-产生率分别降低26％和71％。但是，没有观察到辐照度对NH4 +氧化亲和常数的显着影响。在较高的光强度下，亚硝酸盐积累的增加表明亚硝酸盐氧化剂的光敏感性更高。此外，NH4 +氧化呼吸测定法分别显示在500和1250μmol m（-2）s（-1）时，氧的吸收减少了14％和50％。实验确定硝化细菌财团（lambda = 0.0003 m（2）g（-1））和solorkiniana小球藻（lambda = 0.1045 m（2）g（-1））的消光系数（lambda）估计藻细菌高速率藻池中的光渗透，这表明存在高密度微藻培养物时，硝化细菌的光抑制作用可以显着减轻。 2016 Elsevier Ltd.保留所有权利。

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