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Strong Bio-Film Packing

Strong Bio-Film Packing

Structure, including the cell body, fillers, water distribution system, the aeration device. The working principle is: Set in theaeration tank filler, which was used as the bio-film carrier. Afterthe wastewater to be treatedflows through a flow rate ofoxygenate to a filler in contact with the bio-film, bio-film and suspended activated sludge jointaction, to effect purification of wastewater.


Structure, including the cell body, fillers, water distribution system, the aeration device. The working principle is: Set in theaeration tank filler, which was used as the bio-film carrier. Afterthe wastewater to be treatedflows through a flow rate ofoxygenate to a filler in contact with the bio-film, bio-film and suspended activated sludge jointaction, to effect purification of wastewater.

1. The filter requirements

(1) Large specific surface area

(2) High porosity 

(3) High quality material strength 

(4) Stability 

(5) Reasonable price

2. The wall function Structures of the body, play a supportive role.
3. The bottom ventilation systems, Drainage systems, supporting seepage structure
4. Water distribution system rotating water distributor


1.Bio-filter treatment effect is very good,It can meet the country's most stringent environmental requirements in any season.

2. No secondary pollution

3. Microorganisms able to depend on organic growth in the filler.No additional other nutrients,therefore it use fast after stopped. Weekend shutdown or lockout 1-2 weeks after the start of treatment to achieve good results immediately. A few hours later will be able to achieve the best treatment effect.Stop running 3-4 weeks before starting treatmentimmediately have a good effect, within a few days to restore optimal treatment effect.

4.Bio-filter has a large buffer capacity.It can automatically adjust the concentration peak microbial always work and strong ability of resistance to shock loading.

5. Run by automatic control, very stable, without manual operation. Less wearing parts, maintenance and management is very simple, which can achieve unattended. Workers inspect whether the machine simply malfunction.

6. Bio-filter using cell body assembled for easy transportation and installation. When increasing the processing capacityby simply adding components, easy to implement. Also dealt with separately under the gas source to facilitate the dispersion conditions.

7. This type of filter in the form of very low energy consumption bio-filter, After running half years.a filter pressure loss is only about 500Pa.

 Technical process:

1. The single-stage carbon oxidation BAF is mainly used for removing the carbonaceous organic matter from sewage.

2. The single-stage carbon oxidation BAF with lower loading or carbon oxidation and nitrification filter BAF together, is used for  removing carbonaceous organic matter and ammonia nitrogen in the wastewater of nitrification.

3. The lead bio-filter combined with denitrification, is used for inflow water sufficient carbon source and high outlet water quality requirements for nitrogen.

4. The rear or lead bio-filters for denitrification with plenty of carbon, is used for the inflow water with high nitrogen density,lack of carbon, but the outlet water is strict with nitrogen. (the nitrifying liquid reflux rate for the lead bio-filterscan be calculated according to the specific design NO3-N removal and inflow nitrogen and oxygen ratio, plus the amount of carbon .

Specification Data:


Volume Loading

Hydraulic Loading 
(filtration rate)

Retention time of Empty 
bed hydraulic

Carbon oxidation filter




Nitrification filter




Bio-filters for denitrification




Carbon oxidation/
nitrification filter

1.0-3.0kgBOD5/(m.d) 0.4-0.6kgNH3-N/(m.d)



The lead bio-filters for denitrification




The rear bio-filters for denitrification





1.The dissolved oxygen from the carbon oxidation and nitrification filters water output should be controlled 3.0-4.0mg/L.

2.The filtration rate increase will has disadvantage for the carbon oxidation,part of the non-dissolved organic matter degradation is not discharged,we recommend 6m/h. 

3.But in the volume load within a certain range, the filtration rate increase will not only reduce the removal rate of biological aerated filter, but also increase the efficiency of nitrification and denitrification. There are three main reasons: first, high filtration velocity enhance the mass transfer efficiency filter inside, making it more contact opportunities between biological air, sewage; second, high filter velocity, bio-film updates faster, enhanced biological activity. Third, low speed, the filter material easy to plug, the backwash cycle shorten, and frequent backwashing of nitrifying bacteria reproduction slower is unfavorable.

4.Filter is mainly used for carbon dioxide, when the water BOD5=10~20mg/L, volume load to recommend the use of 3.5~5.0kgBOD5/ (m, d), when the water BOD5=5~10mg/L, volume load to recommend the use of 2.5~3.2kgBOD5/ (m, D).

5.Filter is mainly used for carbon oxidation and nitrification, volume load BOD5 ≤ 3 kgBOD5/ (m, d), research shows that, when BOD5 volume load is greater than the value, the removal of ammonia nitrogen from suppression, when BOD5 ≥ 4 kgBOD5/ (m, d), ammonia nitrogen removal received significantly inhibited.

6.The effluent CODcr in 60mg/L, influent load should be in 4.0~5.0 kgCODcr/ (m, d), when CODcr ≤ 50mg/L, influent load should be controlled at less 3 kgCODcr/ (m, d).

7.Filter with nitrification and denitrification requirement, need to check the nitrification and denitrification capacity load. Suggest volume load were less than 2 kgNH3-N/ (m, d) and 5 kgNO3-N/ (m, d), recommend the use of 0.3~0.8 kgNH3-N/ (m, d) and 0.8~4.0 kgNO3-N/ (m, D).

8.When the need for nitrogen removal, and the lack of carbon source, before the denitrifying tank in a nitrification tank, the nitrification tank part back to the denitrification pool, a pre denitrification. Has the following advantages: A. the organisms in wastewater as carbon source, reducing external carbon source. B. organic matter removal in the denitrifying tank, to ensure that the nitrification ability of carbon oxidation and nitrification tank. C.Aeration system is relatively less, D. the amount of sludge is less. The BOD5 adequacy and nitrogen removal of domestic sewage, consider pre denitrification process advantages from the operation cost.

9.Post denitrification process is more suitable for use in the following areas: A. BOD5 were significantly lower (industrial wastewater with high proportion). B, used in the reconstruction of wastewater treatment plant upgrade, before considering the nitrification indicator, the effluent BOD5 is low, but high ammonia nitrogen.

10.In order to avoid the effect of carbon on nitrification in addition, post denitrification in the preprocessing stage, removing a portion of the BOD5, C/N pool design rate of filtration should be 6~10m/h, nitrification load should be satisfied: the influent BOD5 ≥ 60mg/L, is about 0.3kgNH3-N/ (m, d), when BOD5=20~50mg/L, about 0.6kgNH3-N / (m, d), when BOD5 ≤ 20mg/L, is about 1.0kgNH3-N/ (m, d), using methanol as carbon source, the DN dosage is 3.3 kgCH4O/ kgNO3-N.

11.Design recommendations denitrification load 0.4~0.5 kgNO3-N/ (m, d), filtration velocity ≥ 10m/h, the best influent BOD5/NO3-N ≥ 6, usually DN pool on the removal rate of BOD5 ≤ 60%, the removal rate of CODcr ≤ 70%, the remaining CODcr will enter the nitration reactor, to ensure that the nitrification ability of N pool (greater than 0.5kgNH3-N/ (m, d)), the load of CODcr ≤ 2.0kgCODcr / (m, d).

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