IV. Wastewater Treatment Technologies Topic IV. 10 by Zw48Ik7

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									    IV. Wastewater Treatment Technologies
 Topic IV. 10. Wastewater Treatment Facilities
with Attached Biomass - Trickling Filters: Kinds,
   Structures, Basic Technological Parameters
                Kinds of Trickling Filters
        I. According to the technological parameters
         Low rate trickling filters
         High rate trickling filters
         Rotating disks

        II. According to the carrying material
         Natural (gravel)
         Plastics
               Grains
               Sheets
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Wastewater Treatment Facilities with Attached
                 Biomass
                 Kinds of Trickling Filters

  III. According to the necessity of wastewater recirculation
   With purified wastewater recirculation
   Without purified wastewater recirculation

  IV. According to the the kind of biological processes
   Aerobic
         With natural circulation of air
         With ventilators or blowers
   Anaerobic

  V. According to the technological stages
         One stage (single)
         Two stages                                            2
Kinds of Trickling Filters

                 Technological Schemes
                    with Recirculation

              a - with purified wastewater recirculation
              б - with purified wastewater and
                  secondary sludge recirculation
              b - with interim settling
              1 - primary settling tank
              2 - trickling filter
              3 - secondary clarifier
              4 - secondary sludge
              5 - recirculating wastewater
              6 - primary and secondary sludge




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                         Kinds of Trickling Filters




                   Scheme of Two Stage Trickling Filters
1 - primary sludge; 2 - first stage trickling filter; 3 - first stage secondary clarifier; 4 - second
        stage trickling filter; 5 - second stage secondary clarifier; 7 - recirculating purified
                            wastewater; 8 - primary and secondary sludge




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                           Trickling Filters

                                Structures




 General Scheme of Trickling Filter (Round in Plane)
1 - biomass carrier; 2 - wall; 3 - drainage bottom; 4 - drainage collecting channel;

           5 - jet wastewater distributing device; 6 - ventilation orifices            5
       Trickling Filters

          Structures




Jet Wastewater Distribution Device

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                                Trickling Filters

                                     Structures




                   Drainage Bottom of Trickling Filter
a - bricks; б - arch drainage elements; b - concrete bar racks; г - drainage bottom supporting
                                              elements



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   Trickling Filters
       Structures




Rotating Disks (Biodisks)
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                     Trickling Filters
           Basic Technological Parameters
qf - surface hydraulic load, m3/m2.d          OC  ( L0  L)Q / W
qw - volume hydraulic load, m   3/m3.d

OC - oxidizing capacity, gBOD5/m3.d
                              3.d
                                              OL  L0 .Q / W
OL - organic load, gBOD5/m
Q - wastewater design flowrate, m3/d              Qr L0  Lmix
W - trickling filter working volume, m   3    n      
Qr - recirculating wastewater flowrate, m3/d      Q      Lmix  L
n - recirculation ratio
L0 - influent BOD5 concentration, g/m3        F  Q ( n  1) / q f
L - effluent BOD5 concentration, g/m3
Lmix - mixed wastewater BOD5 concentration, g/m3
F - trickling filter horizontal area, m2

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