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Membrane filtration device for studying compression of fouling layers in membrane bioreactors

机译：用于研究膜生物反应器中污垢层压缩的膜过滤装置

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摘要

A filtration devise was developed to assess compressibility of fouling layers in membrane bioreactors. The system consists of a flat sheet membrane with air scouring operated at constant transmembrane pressure to assess the influence of pressure on resistance of fouling layers. By fitting a mathematical model, three model parameters were obtained; a back transport parameter describing the kinetics of fouling layer formation, a specific fouling layer resistance, and a compressibility parameter. This stands out from other on-site filterability tests as model parameters to simulate filtration performance are obtained together with a characterization of compressibility. Tests on membrane bioreactor sludge showed high reproducibility. The methodology’s ability to assess compressibility was tested by filtrations of sludges from membrane bioreactors and conventional activated sludge wastewater treatment plants from three different sites. These proved that membrane bioreactor sludge showed higher compressibility than conventional activated sludge. In addition, detailed information on the underlying mechanisms of the difference in fouling propensity were obtained, as conventional activated sludge showed slower fouling formation, lower specific resistance and lower compressibility of fouling layers, which is explained by a higher degree of flocculation.
机译：开发了过滤装置以评估膜生物反应器中结垢层的可压缩性。该系统由一个带有空气洗涤的平板膜组成，该膜在恒定的跨膜压力下运行，以评估压力对结垢层阻力的影响。通过拟合数学模型，获得了三个模型参数。描述污垢层形成动力学，污垢层电阻率和可压缩性参数的反向传输参数。这与其他现场可过滤性测试脱颖而出，因为获得了用于模拟过滤性能的模型参数以及可压缩性表征。膜生物反应器污泥的测试显示出高重现性。通过过滤来自膜生物反应器的污泥和来自三个不同地点的传统活性污泥废水处理厂的过滤，测试了该方法评估可压缩性的能力。这些证明膜生物反应器污泥显示出比常规活性污泥更高的可压缩性。另外，获得了关于结垢倾向差异的潜在机理的详细信息，因为常规的活性污泥显示出较慢的结垢形成，较低的比电阻和较低的结垢层可压缩性，这可由较高的絮凝度来解释。

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