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7.
1.
2.
5 Advantages and disadvantages of biological aerated filter process
The advantages of the biological aerated filter process are as follows
.
①The load is high and the effluent quality is good
.
When the volume load is about 6.
② Impact load resistance
.
③ Less floor space
.
The area occupied by the biological aerated filter is only 1/5 to 1/10 of the conventional secondary biochemical treatment
④Province of investment
.
The total hydraulic retention time of the BAF system is short, the required infrastructure investment is small, and the effluent quality is high; backwashing removes the shed biofilm and retentate without the need for a secondary settling tank
⑤Simple management and high degree of automation
.
⑥Small impact on the environment and low temperature impact
.
⑦High biological activity (short sludge age), good mass transfer conditions; high oxygenation efficiency; presence of filamentous bacteria; high biofilm concentration, complex biological phase and reasonable flora structure
.
① The amount of sludge is relatively large, and the sludge stability is poor
.
For aerobic biological treatment, the higher the load, the stronger the processing capacity per unit volume, and the more organisms are produced.
Coupled with the large amount of SS intercepted in the filter, it will undoubtedly increase the output of sludge
②Increase the cost of daily medicine
.
In order to enable the filter to run in a longer cycle, reduce the number of backwashes, and reduce energy consumption, the filter influent must be pretreated to reduce the SS in the influent, especially when the filter is used for secondary treatment.
7.
Some domestic application examples of biological aerated filter are shown in Table 7-3
Table 7-3 Some application examples of biological aerated filter in China
Related links: Factors affecting the operation of biological aerated filter
