The technology concerning water treatment by means of filter
Even though there are various technologies used for separating the contaminant from polluted water, one of the simplest methods is the filtering treatment. The filtering treatment has been defined as one of the best separation technologies. It prevents second contamination and has not been converted into other chemical characteristics.
Most of the previous utilized filtration technologies were the conventional and traditional sand filter, spun bonded or melt-blown cartridge filter, highly polymerized compound, ceramic and membrane filter and metal filter. Those products have been made of the various kinds of raw materials and the respective pore size concerning the practical usage ranges available from several tens of micron to ion size. They are already available in the practical market.
Although those technologies were capable of filtering well, they were unable to be utilized at the wider applicable ranges in the industrial field. Such utilization has been limited to the purification plants and some other very simple treatments only. The reason for the limited capabilities was the result of very poor performance in backwashing. The reason why the conventional filtering systems has such a poor backwashing performance was due to the fixed pore structure. Because it was very difficult to be re-penetrated into the fouled pore structure. Accordingly, it has been recognized that the variable pore structured micro filter should be developed so as to improve the efficiency of backwashing.
As shown on figure I, the commercialized filters are being divided into the pore structure and the surface structure. Most of conventional and traditional variable pore structure type filters have been very limited to the size that is bigger than 20-micron. This size has been very inefficiency low filtering process. Therefore, our environmental technology R&D team has developed a new product, the VPMF, with a variable pore structure which took over 10 years. At the moment, the VPMF products are being operated and maintained in good conditions at almost 50 plants in the various industrial fields in Korea.
What is the VPMF?
Variable Pore-structure Micro Filter
The inflow of raw water through its inlet gradually compresses the cylindrical filter. If the filter pressure reaches critical (or optimum) depth, the filter pressure will not occur. Through the pressure filter layer, the raw water will be filtered for discharging the water into an effluent inlet.
If the backwashed water and air are poured through the effluent inlet, the compressed filter will be gradually expanded in an upward direction. Thereafter, the pore structure divides into pieces and the fine air bubble separates the pollutants between the filters to discharge it into the raw water inlet. At this time, the cylindrical filter slightly vibrates itself resulting in the synergism of washing and conducts full backwashing.
The VPMF system is defined as follows :
- By means of the inflow of raw water, the micro fiber has been compressed gradually. Therefore, it affects the pressurized filter layer very significantly. In conclusion, the raw water will be filtered for discharging the water into an effluent one.
- By means of the back washing water as well as compressed air, the backwashing will be implemented by dividing the pore structure into pieces and the fine air bubble simultaneously. It will separate the pollutants between the filters to discharge it into the raw water. Accordingly, the cylindrical filter slightly vibrates itself resulting in synergism of washing. Therefore, it implements perfect backwashing performance.
The Range of Applications
In case of polluted sewage, it can be treated and then diverted into the artificial pond, which can be the environmental friendly made parks and also used for irrigation and factories, based on recycling concept. For industrial waste water, it can be sufficiently recycled and reused for production lines without any effluent of useless waste water by means of preliminary and secondary purification process.