Municipal waste water treatment plants
for 250 - 750 EI

Municipal waste water treatment plants of this size are made in two type series:

Supplies

The basic AČB treatment units comprise reservoirs made of polypropylene wall elements with built-in or separated settlement tanks, eventually they are designed to be built in concrete reservoirs. The AČB SBR treatment plants are designed to be built in plastic or concrete reservoirs.
The basic treatment unit is complemented by a pumping station, coarse preliminary cleaning, tertiary treatment, gauging shaft, sludge terminal, event. other technological unit.

WWTP AČB 250 - 750

Function description

WWTP AČB 250 to 750 are manufactured in a type range of 6 sizes. Waste water flows in through the supply pipe into the denitrification zone of the plant directly (AČB 250) or through a division shaft (AČB 350 to 750), which divides the inflow into both parallel reservoirs. The denitrification zone is mixed using coarse-bubble aeration elements, the nitrification zone is fully aerated by fine-bubble elements AME-260. A degassing unit is installed at the drain from the activation area, then the activation mixture spontaneously flows out into the centre cylinder of the settlement tank, which is either part of the container or it is installed behind the treatment plant tanks. Treated water flows off the treatment plant through a discharge trough with scum boards. Floated and sedimented activated sludge is withdrawn by air lift pumps back to the activation zone, or using the other air lift pump into the sludge collector as excess sludge. The pressure air for the aeration systems and air lift pumps (eventually for sludge collector aeration) is generated by blowers, in the following composition: 1 operating + 1 reserve (for AČB 250), or 2 operating + 1 reserve (for AČB 350 to 750). The treatment plant operation is controlled by the MPC 300 control system.

Advantages of WWTP AČB 250 to 750:

Basic data - plastic containers

Type AČB 250 350 450 550 650 750
No. of equivalent inhabitants EI 150-250 250-350 350-450 450-550 550-650 650-750
Waste-water quantity Q24 m3/d 37,5 52,5 37,5 82,5 97,5 112,5
- Qmax m3/h 6,8 11,6 13,7 13,5 15,6 18,2
Basic dimensions
length  × width
height
m
m 		 1 reserv
2,4 × 8,0
3,08 		2 reserv
2,4 × 7,4
3,08 		2 reserv
2,4 × 8,0
3,08 		2 reserv
2,4 × 6,8
3,08		 2 reserv
2,4 × 7,4
3,08		 2 reserv
2,4 × 8,0
3,08
Settlement tank   Inbuilt Inbuilt Inbuilt DN 360 DN 360 DN 420

Basic data - technological building-in into concrete reservoirs

Type AČB 250 350 450 550 650 750
No. of equivalent inhabitants EI 150-250 250-350 350-450 450-550 550-650 650-750
Waste-water quantity Q24 m3/d 37,5 52,5 37,5 82,5 97,5 112,5
- Qmax m3/h 6,8 11,6 13,7 13,5 15,6 18,2
Basic dimensions
length  × width
height
m
m 		 1 reserv
2,78 × 6,6
3,0 		2 reserv
2,78 × 5,1
3,0 		2 reserv
2,78 × 6,1
3,0 		2 reserv
2,78 × 7,1
3,0		 2 reserv
3,2 × 7,6
3,0		 2 reserv
3,2 × 8,5
3,0
Settlement tank   Inbuilt
DN 260 		Inbuilt
DN 260		 Inbuilt
DN 260 		DN 260 DN 300 DN 300

Treated water quality

Indicator Guaranteed values of soiling in outlet (mg/l) acc. to SO 61/2003 Coll. Usually attained average values in outlet (mg/l)
"p" "m"
BOD5 30 60 15
COD 125 180 75
Insoluble solids 35 70 20
N-NH4+ - - 10 (for water T > 12°C)

Waste water treatment plants AČB 250 to 750 were tested in operation by the T. G. Masaryk Water Research Institute in Prague, and they were recommended for installation in appropriate localities.

WWTP AČB SBR 250 - 750

Function description

WWTP AČB SBR 250 to 750 – they are made in a type range of 6 sizes. AČB SBR works on the principle of low-rate activation with sequential batch reactor where the same reservoir (reactor) is used for both activation and sedimentation of suspended solids. According to the type, the reactor consists of one or two reservoirs. A sedimentation reservoir may be installed before the reactor. This reservoir serves at the same time as an accumulation collector and a collector for partial anaerobic sludge stabilization. The separate phases of the treatment process in the reactor (filling with aeration, sedimentation, removal of treated water and excess sludge) are connected in cycles to each other. Treatment plant AČB SBR may also be designed as a WWTP with nitrification and denitrification. It is also possible to install chemical precipitation of phosphorus. The basic version of the treatment plant is controlled by the MPC 300 control system.

Advantages of WWTP AČB SBR 250 to 750:

Basic data - technological building-in into concrete reservoirs

Type AČB SBR  250 350 450 550 650 750
No. of equivalent inhabitants EI 150-250 250-350 350-450 450-550 550-650 650-750
Waste-water quantity Q24 m3/d 37,5 52,5 37,5 82,5 97,5 112,5
- Qmax m3/h 6,8 11,6 13,7 13,5 15,6 18,2
Orientation reactor volume m3 48 67 87 101 119 137

Treated water quality

Indicator Guaranteed values of soiling in outlet (mg/l) acc. to SO 61/2003 Coll. Usually attained average values in outlet (mg/l)
"p" "m"
BOD5 30 60 15
COD 125 180 75
Insoluble solids 35 70 20
N-NH4+ - - 10 (for water T > 12°C)

Waste water treatment plants AČB SBR were tested in operation by the T. G. Masaryk Water Research Institute in Prague, and they were recommended for installation in appropriate localities.

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FORTEX-AGS, a.s. Jílová 1550/1, 787 01 Šumperk
www.fortex-ags.cz