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首页> 外文期刊>International Journal of Environmental Science and Technology >The hydraulic retention time on the particle removal efficiency by Daphnia magna filtration on treated wastewater
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The hydraulic retention time on the particle removal efficiency by Daphnia magna filtration on treated wastewater

机译：水蚤过滤处理后水力停留时间对颗粒去除效率的影响

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摘要

The study of low-cost techniques for the tertiary treatment of wastewater is of global interest; above all low-energy techniques that do not require the use of chemicals. In this study, a wastewater treatment technology based on the filtration by a zooplanktonic population (Daphnia magna) is studied in controlled laboratory and mesocosm experiments for different hydraulic retention times (HRT). The efficiency of the treatment is evaluated in terms of particle removal efficiency. From laboratory experiments, HRT over 12 h and Daphnia concentrations above 50 individuals l(-1) guarantee a particle removal efficiency greater than 30 %. However, low HRT of 6 h would require Daphnia concentrations above 70 individuals l(-1) in order to obtain a particle removal efficiency of 20 %. The minimum removal efficiency of 2 % was for HRT = 3 h, independent of the Daphnia concentration. In the mesocosm, the growth of Daphnia individuals enhanced Daphnia magna filtering rates and higher removal efficiencies than those in the laboratory for the same HRT range. In the mesocosm experiments E. coli concentrations were reduced to a maximum of 2 logarithmic units. A balance equation model is proposed to predict particle removal efficiencies for varying HRT.
机译：研究低成本的废水三次处理技术具有全球性的兴趣。最重要的是不需要使用化学品的低能耗技术。在这项研究中，在不同的水力停留时间（HRT）的受控实验室和中观实验中研究了一种基于浮游动物种群（Daphnia magna）过滤的废水处理技术。根据颗粒去除效率评估处理效率。根据实验室实验，超过12小时的HRT和超过50个人l（-1）的水蚤浓度保证了大于30％的颗粒去除效率。但是，低HRT的6小时将需要水蚤浓度高于70个个体l（-1）才能获得20％的颗粒去除效率。 HRT = 3 h的最小去除效率为2％，与水蚤浓度无关。在中观中，与相同的HRT范围相比，水蚤个体的生长提高了水蚤的过滤速度并提高了去除效率。在中观实验中，大肠杆菌的浓度降低到最多2个对数单位。提出了一个平衡方程模型来预测不同HRT的颗粒去除效率。

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