High efficient aeration biological filter tank / HN-HIP BAF

Home > Technology
HN-HIP BAF summary 
HN - HIP BAF high efficient aeration biological filter tank, is developed and optimized on the basis of the traditional BAF technology, the modified polyurethane packing is applied, containing mixed bacterium agent. It can target different types of wastewater efficiently, can be used in the secondary biological treatment, can also be used for deep treatment. It is widely used in municipal wastewater, food, pharmaceutical, printing and dyeing, coal chemical, petrochemical and other industrial wastewater and municipal wastewater upgrading.
Technical characteristics
·The packing in the middle of the pool is in the semi-fluidized state on fixed bed. It can   not only ensure that the outflow SS reaches the standard stably, but also solve the   problem of traditional BAF packing hardening.
·Only air recoil is used, clear water or treated water back washing is not needed. The   back washing volume is greatly reduced and the water yield of the system is improved.
·The packing is rich in unique and highly effective microbial agent, which can directly   treat high concentration wastewater.
·There is no need of backwash fan and backwash pump. Easy to operate and maintain.

Technical advantages
·The biomass of the HighNew special packing is very high. It has fixing effect on   bacteria.It is easy for the microorganism to stick to the membrane and not easy to be   lost.
·The biomass per unit volume is large. Reliability and effluent quality is good.
·Without the foil layer, the whole packing area is full of effective organism.

·The working load is large, the volume of the pool is smaller than the traditional BAF,   and there is no need to build a backwash pool.

HN-HIP BAF process diagram

Comparison Between Conventional BAF and HN-HIP BAF


Conventional BAF


Specific surface area


High,approximately 10×104m2/m3

Biomass within fillers


Biomass can be between 25~40g/L




Surface features

None hydrophilic

Hydrophilic with active groups on the surface


Easy to be blocked and requires periodically cleaning

Hardly to be blocked as the carriers are in semi-fluidization form

Life span

Approx. 5 years

Over 10 years


Difficult to install

Easy to install with directly pour in



Easy, carriers is in a light weight

Supporting layer


No supporting layer required (patented)



Great. With effluent BOD5≤5mg/L, NH4-N≤1mg/L. Over 95% of ammonia nitrogen can be removed.

DO Utilization


High porosity. balanced water and air distribution. DO transmitting is highly efficient

Back flushing

Back flush by air and water. with very high frequency

Just air flushing. No pump required. Less flushing water is consumed. At the meantime, the blower can be use for multiple purposes includes process aeration, and air scouring. Low flushing frequency: once or twice a week.

Back flushing nozzles  


Not required. A perforated tube is used for back flushing

Capital cost


Low, as no requirement for back flushing systems and one blower used for multi purposes.

Back flushing tank


No required

Comparison of the operation between conventional BAF and HN-HIPBAF after years

Aeration of conventional BAF                                                                   Aeration of HN- HIPBIOFILTER

HN-Compound Bacteriological Agent

(1) Function
Specific bacteria: According to the type of pollutants, different bacteria is selected and matched.
Enzyme: According to the type of bacteria, the matched enzyme is added to accelerate the biochemical reaction rate.
Bionutrients: Nutrition for bacterial growth is supplied.

(2) Characteristics
Specialized bacteria are matched according to the water quality, with strong pertinence.
The matched enzymes and nutrients are added to promote the metabolism of bacteria and accelerate the reaction speed.
The domestication time is short, which is 2/3 shorter than the traditional natural culture method.
It is non-toxic, non-corrosive and non-polluting, and no need to increase protection and safety devices.
After one-time inoculation of specific bacteria , it is not necessary to add in normal operation.

Matching of contaminants with bacteria






Thiobacillus, filamentous sulfur bacteria, photosynthetic sulfur bacteria and colorless sulfur bacteria


Benzene series

Pseudomonas fluorescens, Phenylbacillus and Bacillus



Pseudomonas aeruginosa, Acinetobacter Acinetobacter and Trichomonas plexus


Nitrogen compounds

Ammonia-oxidizing bacteria, nitrifying bacteria and nitrosobacteria



Pseudomonas and Penicillium


Company profile Address by the President Values and Culture History Qualification


Solvent Purification Wastewater Treatment Technology forum Projects


Company news Industry news Media coverage Video data


Opportunity People Oriented
86+571-85123299 Floor 1&2, North of Building 1,No.16,Longtan Road,Cangqian Town,Hangzhou City,Zhejiang Province, China --Friendship link-- China Petroleum China Sinopec