关键词: 深层过滤, 运行性能, 调控方法, 实验验证, 压降

Abstract:

The fine particles suspended in industrial wastewater are not only the main pollutants themselves, but also easily provide attachment sites for other forms of pollutants. For the removal of fine particles in industrial wastewater treatment, deep filtration based on microchannel separation meets the requirements of separation accuracy and has a high upper limit of pollutant accommodation. It has obvious advantages of high efficiency and stability, long operation cycle and low cost. However, the operating performance of the deep filtration process is often affected by many factors. Unreasonable bed structure design is likely to cause deterioration of effluent quality and high operating energy consumption. In this paper, a multi-layer structure bed was designed by using non-single medium, and the combination of micro-channels in each layer was used to form a micro-channel different from any single medium. At the same time, relevant equipment was built and batch tests were carried out. The results showed that the proposed multi-medium stratified bed control improvement scheme reduced the total bed height to 2/3 of the original height, the separation effect was not significantly reduced, and the total pressure drop was reduced to 33% before the improvement. Compared with the single medium bed, the filtration energy consumption was reduced by 25%, the bed at all levels was closer to the upper limit state, and the useless work loss in the backwashing process was reduced. The control method could significantly reduce the energy consumption of the equipment during the whole operation cycle. Therefore, the improvement scheme of using multi-medium to design layered bed to regulate the microchannel structure in the bed was helpful to improve the operation performance of deep filtration equipment and make it more economical and lightweight.

Key words: deep filtration, operation performance, control method, experimental validation, pressure drop