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7.
1.
2.
2 Biofor type biological aerated filter
The structure of Biofor biological aerated filter is shown in Figure 7-4
.
The main body of the biological aerated filter can be divided into five parts: water distribution system, air distribution system, supporting layer, biological filler layer and backwashing
Figure 7-4 Biofor type biological aerated filter structure
7.
1.
In the biological aerated filter process, the filler plays a role of a biological carrier on the one hand, providing a good growth environment for the biofilm, and on the other hand, it also plays a role of filtration
.
In fact, the performance of the biological aerated filter depends largely on the characteristics of the filler, so the selection of suitable fillers is of great significance to the promotion and application of the biological aerated filter
Table 7-2 Overview of various types of BAF models, manufacturers, types, and filter materials
The research on the filter material of biological aerated filter in China is mainly based on ceramsite.
At present, new types of filter materials such as enzymatic ceramsite, spherical lightweight ceramsite, and nano-modified ceramsite have been developed on the basis of ceramsite filter material.
Biostyr uses spherical organic fillers with a relative density less than water, with a particle size of 3.
5-5mm.
It has good mechanical strength and chemical stability.
It has certain advantages in providing a growth environment for microorganisms, intercepting SS, and promoting uniform mixing of air and water.
.
At present, there are many kinds of fillers used for BAF, and the Biolite expanded aluminosilicate used by Biofor, another representative form of BAF , belongs to Sunken Media
Related links: Sewage treatment-Biostyr type biological aerated filter
