Sander S, Behnisch J, Wagner M
Technische Universität Darmstadt, Institute IWAR, Franziska-Braun-Straße 7, 64287 Darmstadt, Germany E-mail:
Water Sci Technol. 2017 Apr;75(7-8):1555-1563. doi: 10.2166/wst.2017.027.
The impact of sea salt on the aeration coefficient ka of fine-bubble aeration systems was investigated in clean water and in a model substance for simulating activated sludge. The investigations were carried out at laboratory and pilot scale. Sea salt was dosed in the form of artificial seawater, real seawater or simplified, by adding NaCl. The investigated media showed an increase of ka with rising sea salt concentrations up to 10 g/L. The ratio between ka and sea salt concentration is impaired by the air flow rate and the type of applied diffusers. Literature data show that the favourable effect of sea salt on ka can also be found in the activated sludge of conventional municipal wastewater treatment plants. The results of this study allow the derivation of salt correction equations to be used in the design of fine-bubble aeration systems for taking into account the favourable impact of sea salt on ka. By that means, a more precise design of respective systems will be enabled.
在清洁水和模拟活性污泥的模型物质中，研究了海盐对细气泡曝气系统曝气系数ka的影响。研究在实验室和中试规模下进行。通过添加NaCl，以人工海水、实际海水或简化形式添加海盐。研究介质表明，在海盐浓度高达10 g/L时，ka随海盐浓度升高而增加。ka与海盐浓度之间的比例受空气流速和所用曝气器类型的影响。文献数据表明，在传统城市污水处理厂的活性污泥中也能发现海盐对ka的有利影响。本研究结果有助于推导盐校正方程，用于设计细气泡曝气系统时考虑海盐对ka的有利影响。通过这种方式，可以实现相应系统更精确的设计。
