Denitrification deep bed filter technology

       Denitrification deep bed filter technologyIt is a treatment unit that combines biological denitrification and filtration functions into one,It is a treatment process that combines denitrification and filtration..The surface of most filters is easily clogged or hardened,Lose water head quickly,The homogeneous quartz sand of the denitrification deep bed filter allows solid impurities to penetrate through the surface of the filter bed.,Deep into the filter material of the filter,Meet the requirements for solid matter interception throughout the depth of the filter.
       The denitrification deep bed filter body adopts a narrow corridor to ensure uniform water inflow; the filter brick structure makes the filter backwash effect good; the nitrogen generated during the denitrification process will cause air blockage in the filter, and the filter operation effect is ensured by expelling nitrogen.
       When an external carbon source is added, the operation mode is a deep bed denitrification filter with denitrification function, which can remove TN,SS and TP. When the external carbon source is eliminated, a deep bed filter can be used to remove the carbon source at the same time.SSandTP.
       The denitrification deep bed filter is essentially a filled fixed membrane reactor..It is a biofilm wastewater treatment process combined with water filtration.,Belongs to biological filtration technology.bacteriaandOther microorganisms grow as a thin film on solid media,When the fluid flows over the solid filter material,Interception using filter materialandThe dual action of biodegradation of the biofilm on the filter material removes pollutants..

Filter structure

System composition

       Filter material: natural sea sand, silica content≥95%, particle size:1.7-3.35mm, filter material thickness≥1.83m,K60<1.4,proportion≥2.6ton/m³,Mohs hardness>6.
       The gravel supporting layer is natural pebbles,particle size3-38mm,thickness380-420mm,point5-6layerpointlayer排列,Support filter material.
       Filter bricks: cast in concrete exteriorHDPE(High density polyethylene)shell,“T”type gas waterpointCloth filter brick,Provide backwash gas waterpointMatching performance.
       Backwash air pipe: materialSS304,Backwash intake pipe provides uniform backwash gaspointmatch.
       Inlet weir plate: materialSS304,thicknessfor≥4mm,for water ingressandBackwash water is evenly distributedpointmatch提供条件.
       Control system:PLCprogrammable controller,Can systematically control all operating equipment inside the filter.
       Valve: ManualandAutomatic valve controls waterandIn and out of Qi.
       carbon source storageandSupply system: usually sodium acetate,The amount of carbon source added is controlled according to the amount of nitrate nitrogen entering the filter..
       Backwash pump: for backwashing the filter materialandNitrogen release system provides backwash water.
       Backwash fan: Roots blower according to the set air volume,Backwash air is fed through the entire filter chassis.
       Other equipment: field instruments,valve,pipelineandNitrogen removal system, etc..

Process characteristics
       1,Air-water combined recoil device,Air distribution device,System integration technology such as operating technology solves direct filtration,The problem of biofilm falling off and blocking the filter in biological filter.
       2,Denitrification deep bed filter continues operation,RemovingNO3-Nwhile producing nitrogen to form“Air blockage”,Continue to run,Filtration resistance loss continues to increase,Filtering short flows may even occur,Deterioration of effluent water quality.
       3,integrity,Integrated automation equipment and technology,Online monitoring instruments,computer program control,The overall process can last for a long time,Stablize,Reliable continuous operation,Air and water recoil,Nitrogen removal and other operations,Solve process control problems that cannot be completed by manual operation.
       4,The effluent water quality can meet water body standards.

Current conventional processes:TType filter brick air-water distribution system

Product introduction
1. Anti-clogging long-handled filter head (bottom-mounted)
       Features:
       1,cloth water,Even air distribution
       2,Strong water passing ability,Little water head loss 
       3,High pressure-bearing strength,Long use time
       4,Adopt hard seal form,No air leakage
       5,Bottom-mounted structure,Easy to disassemble and clean when needed
       6,Cooperate with precipitation level backwash technology,No worries about clogging
2. Multifunctional filter tube
       Features:
       1,Innovative filter bottomcloth waterAir distribution system,Solved filter clogging problem,Uneven water distribution problem,The aeration system is easily damaged and has problems with uneven aeration..
       2,Innovative low-intensity backwash technology,Not only does it rinse clean, but the biological recovery time is short (at least shortened3times or more) ,The flushing interval can be as long as168Hour(48-168h) .
3. Single hole membrane air diffuser
       Features:
       1,Small bubble diameter,pointEven cloth
       2,Easy to install,Not easy to clog
       3,High system oxygen utilization rate,Exceed30%
       4,The diaphragm adoptsEPDM,Long use time
4. High precision filter plate
       Features:
       1,Steel mold casting,Large overall carrying capacity
       2,High flatness,cloth waterEven air distribution
       3,No need to level the filter head,Convenient construction, installation and debugging

Inlet water quality requirements
       BAF-CPool:COD≤200mg/L,SS≤50mg/L;
       BAF-NPool:COD≤70mg/L,SS≤30mg/L.

Internal and external appearance drawing

Scope of application
       1,Urban sewage treatment plants to increase capacity or build new ones
       2,Water plant quality improvement or new construction
       3,Industrial wastewater depth
       4,Black and smelly water treatment
       5,Reuse of reclaimed water