Compared with common filter, MW-TLC tower biological filter increases the height of filter tank, places filling compound layer by layer and it is well-ventilated, making up the defect of common biological filter (non-aeration) in dissolved oxygen shortage. Our factory adopts light plastic ripple plate with large hole diameter as filter material, like honeycomb structure made of epoxy glass (or nylon petal-shaped soft filtering material). The purification of tower biological filter is realized by metabolism of biological membrane on the surface of filling material.
Features of MW-TLC tower biological filter are high load, large water production volume, small occupying area, small load against impact and strong adaptability to sudden changes in water quality.
The main technical parameters
| Name |
Common biological filter |
High load biological filter |
Tower biological filter |
| Surface load（m³/m².d） |
0.9~3.7 |
9~36(including reflux) |
16~97(including reflux) |
| BOD5 load（kg/ m³.d） |
0.11~0.37 |
0.37~1.084 |
Up to 4.8 |
| Depth（m） |
1.8~3.0 |
0.9~2.4 |
8~12 or more deeper |
| Reflux ratio |
None |
1~4 |
With larger reflux ratio |
| Filtering media |
Multi-use gravel |
Multi-use plastic filter |
Plastic filter |
| The specific surface area（m²/ m³） |
43~65 |
43~65 |
82~115 |
| The porosity （%） |
45~60 |
45~60 |
93~95 |
| Bio-film shedding |
intermittently |
continuously |
continuously |
| Operating requirements |
Simple |
Technical support |
Technical support |
| Dosing frequency |
Less than 5min |
Continuous dosing |
Continuous dosing |
| Sludge |
Black, highly oxidized |
Brown, not fully oxidized |
Brown, not fully oxidized |
| Effluent |
Absolutely nitrification |
Not fully nitrification |
Not fully nitrification |
| |
BOD5￡20mg/l |
BOD5³30 mg/l |
BOD5³30 mg/l |
| BOD5 Removal（%） |
85~95 |
75~85 |
65~85 |
