1 iv. wastewater treatment technologies topic iv. 10. wastewater treatment facilities with attached...
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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
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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 Filters1 - 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
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Trickling Filters
Structures
Jet Wastewater Distribution Device
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Trickling Filters
Structures
Drainage Bottom of Trickling Filtera - 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
qw - volume hydraulic load, m3/m3.d
OC - oxidizing capacity, gBOD5/m3.d
OL - organic load, gBOD5/m3.d
Q - wastewater design flowrate, m3/d
W - trickling filter working volume, m3
Qr - recirculating wastewater flowrate, m3/d
n - recirculation ratio
L0 - influent BOD5 concentration, g/m3
L - effluent BOD5 concentration, g/m3
Lmix - mixed wastewater BOD5 concentration, g/m3
F - trickling filter horizontal area, m2
WQLLOC /)( 0
WQLOL /.0
LL
LL
Q
Qn
mix
mixr
0
fqnQF /)1(