Abstract
This paper deals with an investigation of regeneration methods on a flat sheet membrane by flow visualization of the inlet side of a filter. The regeneration significantly increases performance of the membranes, extends its lifetime and saves resources. The regeneration process prevents depositing of particles on the filter surface and forming a filtration cake as well as reopens clogged pores in the filter structure. The visualization of flow helps deeper investigation of different regeneration methods because it brings a new view on the filtration/regeneration process on a thin laser sheet whilst it is recorded by a digital camera. The result is, besides the overall view, just the local concentration of the particles, which is determined by image analysis of the recorded pictures from the camera. The amount of the deposited particles on the filter is compared to the hydrodynamic data and the effect of the tangential flow and bubbling intensity parameters is investigated in the article. The tests are carried out on a low volume laboratory filtration setup - LSD 115 with a new optic filtration channel.
Highlights
Cleaning of water is a widely discussed topic because it is a part of many branches of industry
Optimal parameters of the continuous cleaning methods as the tangential velocity of water along the filter surface and the intensity of air bubbling were investigated in this paper
Besides the usual hydrodynamic data the new information was achieved from the visualization system, which is the major issue of the paper
Summary
Cleaning of water is a widely discussed topic because it is a part of many branches of industry. The two main mechanisms of the separation are distinguished: sedimentation and filtration. The filtration is a mechanism for separation of contaminants suspended in the medium. It operates entirely on the particle size, which is closely linked to the parameters of the filter as the pore size distribution. There are two main mechanical constructions for the water filtration: bulk filters and flat sheet filters. The bulk filters are generally used for cleaning waters with low solid content – for relatively clean waters. They are disposable and if the filter is clogged, it is impossible to clean it and use it again. It is needed to keep the filter clean and achieve the forward flow high as long as possible [1, 2]
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