Transcript 4Wastewater Treatment10

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
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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
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With natural circulation of air
With ventilators or blowers
 Anaerobic
V. According to the technological stages
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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 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
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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
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qw - volume hydraulic load, m /m .d
OC - oxidizing capacity, gBOD5/m3.d
OL  L0 .Q / W
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OL - organic load, gBOD5/m .d
Q - wastewater design flowrate, m3/d
Qr L0  Lmix
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n

W - trickling filter working volume, m
Q
Lmix  L
Qr - recirculating wastewater flowrate, m3/d
n - recirculation ratio
F  Q(n  1) / q f
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
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