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PACKED WASTEWATER TREATMENT PLANTS

Purpose

Packed series is another type of wastewater treatment plants. New series utilises up-to-date knowledge of the wastewater treatment field and experience of practice got from several year active operation. These treatment plants are intended for treatment of small isolated sources of wastewater as e.g.: satellite small townships, hotels in mountains, camps, motels, service stations, small factories.
Packed wastewater treatment plants (BC) are offered in capacities of 35, 50, 75, 100, 150, 200, 250, 300 to 450 Population Equivalent (PE). The capacity of a treatment plants can be modified by requirements. Treatment plants of higher capacity can be supplied for big sources of wastewater.

Description of design

The bioreactor is a vessel partitioned into several interdependent zones hydraulically interconnected. These zones include mechanical debris collection, sand traps, denitrification, nitrification and final sedimentation zones.

Description of design

Wastewater is first screened to remove larger mechanical impurities by means of debris traps for small plants and by screens mechanically or manually cleaned for bigger plants. Then mechanically screened wastewater enters a denitrification zone where, when mixed with return activated sludge, the first treating processes in wastewater start. Then wastewater under treatment with return activated sludge flows on to nitrification zone - aerated. Other treating processes continue to remove contaminating materials from wastewater. Clear water is separated from activated sludge in the final sedimentation zone. Water flows out and sludge returns back to the system.
Wastewater treatment plants up to 300 PE capacities are supplied as factory-manufactured products - plastic or rust-resistant steel tanks with built-in technology, those of greater capacities are supplied as plant constructions with the technology to be installed. On reconstructing wastewater treatment plants the existing tanks are reused and the plant auxiliary facilities are modernised, if need be. On treating industrial wastewater an aeration tank project is tailored to a size required and a degree of chemical pre-treatment is proposed and designed, if need be (wastewater of textile industry…).



Legend:

1. Inflow, 2. Debris trap or screen, 3. Denitrification zone, 4. Baffle plate, 5. Nitrification (activation) zone, 6. Sedimentation zone, 7. Effluent trough, 8. Outflow, 9. Sludge return, 10. Aeration system


Structural drawing



Packet Plants (BC)
BC 35
BC 50
BC 75
BC 100
BC 150
Population to serve up
EO
35
50
75
100
150
BOD5 load
kg/day
2,1
3
4,5
6
9
Wastewater amount
m3/day
7
10
15
20
30
Power input
kW
1,1
1,1
1,5
1,5
3
Gross weight
kg
850
1000
1200
1500
2400
Height inflow
A
m
1,8
2,3
2,3
2,3
2,3
Heigh outflow
B
m
1,3
1,7
1,7
1,7
1,7
Dimensions
CxDxV
m
4x2,16x2,08
4x2,16x2,58
5x2,16x2,58
6,5x2,16x2,58
5x2,16x2,58
No. of containers
D
m
1
1
1
2
2

Packet Plants (BC)
BC 200
BC 250
BC 300
BC 350
BC 400
Population to serve up
EO
200
250
300
350
400
BOD5 load
kg/day
12
15
18
21
24
Wastewater amount
m3/day
40
50
60
70
80
Power input
kW
3
3
3
3
3
Gross weight
kg
3000
3800
4000
4500
5000
Height inflow
A
m
2,3
2,3
2,3
2,3
2,8
Heigh outflow
B
m
1,7
1,7
1,7
1,7
2,3
Dimensions
CxDxV
m
6,5x2,16x2,58
5,5x2,16x2,58
6x2,16x2,58
6,5x2,16x2,58
6,5x2,16x3,08
No. of containers
D
m
2
3
3
3
3

Packet Plants (BC)
BC 450
Population to serve up
EO
450
BOD5 load
kg/day
27
Wastewater amount
m3/day
90
Power input
kW
4,4
Gross weight
kg
5500
Height inflow
A
m
2,8
Heigh outflow
B
m
2,3
Dimensions
CxDxV
m
7x2,16x3,08
No. of containers
D
m
3

Efficiency

Essentially, the bioreactor combines all functions of conventional biological advanced treatment plants it operates with low sludge load, higher sludge age and reaches higher treatment performance. Reductions of BSK5 and Total Suspended Solids (SS) under 30 mg/l are easily achievable. If observing the Operating Regulation of Wastewater Treatment Plants the below tabulated values can be obtained.

Parameter
BOD5 [mg/l] 20-25
COD [mg/l] 60-100
SS [mg/l] 25-30
N-NH4 [mg/l] 2-5
Ptotal [mg/l] 3-8