1. WASTEWATER TREATMENT PLANTS (WWTP)
PACKAGED DOMESTIC
WASTEWATER TREATMENT PLANTS (WWTP)
AQUATEC type AT6-AT50

2. PACKAGED DOMESTICWASTEWATER TREATMENT PLANTS
AQUATEC TYPE AT6–AT50
Packaged domestic wastewater treatment plants AT6 – AT50 are designed to treat sewage water from
family houses, inhabitable buildings, terrace houses and other sources of wastewater (eg: apartments, restaurants, schools, hotels, factories).
The treated wastewater can be: discharged directly to the surface water; recycled and reused for irrigation of vegetation; after tertiary treatment reused for toilet flushing.

3. The treated wastewater can be:
·discharged directly to the surface water
recycled and reused for irrigation of vegetation
after tertiary treatment reused for toilet flushing

4. According to the European Standard EN 12566-3 and Building product
regulations n. 90/1998, this product was liable to the technical
certification and a certificate of conformity. The technical certification
was issued by The Technical and Test Institute, certificate OM 04.
After completing the tests of the model AT and application of an
internal control of the producer, the certificate of conformity was issued.
The certificate of conformity is in accordance with The European Union
legislation. After the certification of the equipment, the producer is allowed
to market the produced wastewater treatment plants up to 50 PE
under the certificate brand CE and over 50 PE
under the certificate brand C SK.

6. process with aerobically stabilized sludge.
Basic description
The wastewater treatment plant consists of a biological reactor with an inside technological structure. The
cleaning effect is based on the utilization of a low-loaded activated sludge process with an aerobically
stabilization of sludge. The biological reactor is covered with a PP (polypropylene) cover.
The maximum achievable treatment efficiency is based on the utilization of a low-loaded activated sludge
process with aerobically stabilized sludge.

8. We apply in the wastewater treatment plant of type AT the proved continually working biological wastewater treatment process innovated by Slovak patent SK 4324 U and SK 2750 and international patent WO A1. Using this patented technology is achieved the high quality of treated water, low investment and operating costs. The technology is also known under the name of VFL® “Vertical Flow Labyrinth”, resulting in a high quality of the effluent and low 0perational cost. A delivery of a wastewater treatment plant AT is based on a binding order. The terms of delivery and payment are based on the mutual agreement between the parties.

9. Small treatment plants AQUATEC type AT6-50 treat the volume of sewage wastes at a rate of 0.5 up to 7.5 cub.m per day, when the wastewater is received from:
· A single house,
· Apartment houses, apartments,
· Hotels and boarding houses,
· Restaurants,
· Schools,
· Camping sites,
· Small-scale companies, etc.

10. Type of plant AT6 AT8 AT10 AT12 AT 15 AT 20 AT 30 AT 40 AT 50 Persons18 25 35 50
Capacity (m3/d.)
0,9
1,2
1,5
1,8
2,25 3
4,5
7,5
Diameter of the plant
(mm)
1400
1750
2050
2300
2850
2950
Height of the plant
1800
2200
2000
2700
3000
Height of the inlet pipe (mm)
1300
1700
1500
2500
2800
Height of the outlet pipe (mm)
1150
1250
2600
Average electric consumption
(kW/annum)
208
270
411
582
783
1564
2689
2359
4254
The excess sludge removal
(m3/annum) 1 2
2,5
6,3
8,8
12,5

11. Advantages of AQUATEC VFL patented wastewater treatment plants:
· high-performance, removes nitrogen and phosphorus;
· employs no chemical substances;
· diffuses no offensive odour;
· insensitive to peak flows;
· low power consumption (4 persons treatment plant uses less than 208 kWh/per annum);
· low generation of excess sludge (1 cub. m./per annum of excess sludge 4PE)
· occupies less space and spoils no aesthetic scenery, thus allows making the most of the available
space;
· easy-to-use, cost-effective assembling and can be easily conveyed;
· can be left free of wastewater for 30 and more days, thus causing no problems in planning long-
term trips and holidays;
· can operate under any weather conditions – due to the biological processes running in the plant,
the contents of the tankages remains non-freezing even under a very low temperature;
· conforms to the highest ecological standards and produces no impact on the nature.

12. Moreover,
· AQUATEC VFL plant can be assembled and launched within 1 working day.
· Wastewater treatment parameters are available as of the moment the plant is
started.
· The water treated in AQUATEC VFL wastewater treatment plant can be reused as
service water.
The treatment technology
The treatment technology is based on a continually operated modified activated sludge process. The
biological reactor comprises of a non-aerated chamber, aerated chamber, final clarification chamber and
an integrated retention chamber. The chambers are connected by internal circulation and recirculation
conduits between the compartments of the non-aerated chamber, between the non-aerated chamber and
final clarification chamber and between the aerated chamber and final clarification chamber. The nonaerated
chamber is divided by a series of overflowed and underflowed baffles into compartments creating
a so called Vertical Flow Labyrinth (VFL®).

14. In the final clarification chamber, a flow control device is incorporated, which enables the usage of the volume of the integrated retention chamber in all the tanks of the wastewater treatment plant during peak flows and thus protect against the overloading of the plant. This makes possible a more effective tertiary treatment and water recycling, because the discharged secondary treated wastewater does not clog the filtration layer in the subsurface dispersal system or in the filtration equipment. The aeration and the maintaining of the activated sludge in suspension within the aerated chamber is ensured by fine-bubble diffusers. Mixing, circulation, and recirculation of the activated sludge is
provided by compressed air introduced by air pumps, side channel blowers via an air distribution system, it being possible to regulate the flow of compressed air. The operation of the individual air-lift pumps and the aeration is controlled by a control unit. The production of excess sludge is lower than by other conventional technologies.

15. VFL treatment technology satisfies the highest ecological requirements
VFL treatment technology satisfies the highest ecological requirements. The biologically treated water can be reused because of the high cleaning parameters.
All wastewater treatment process is being performed in one single radial polypropylene content. At first, wastewater flows into non-aerated zone, where mechanical pretreatment takes place (2). The non-aerated zone is divided by several internal dividing walls, where internal circulation is established. Further, using gravity, the wastewater flows into anaerobic fermentation zone (3), mixes with activated sludge and flows into denitrification zone (4), where proceeds denitrification processes. From the denitrification zone wastewater overflows into aeration zone (5) . The compressed air through single-bubble aeration elements – diffusers (6)- is incorporated into aeration zone and into airlifts for circulation and re-circulation of the activation mixture. The air supply is from the only mechanism in the system – air blower (9). In the aeration zone proceed wastewater oxidation and nitrification processes. Further, the mixture of activated sludge flows into bottom of sedimentation section (7), where activated sludge by airlift is recycled into denitrification (non-aeration) or nitrification (aeration) zone of plant. 1

16. 1 Inflow
2 Mechanical treatment
3 Anaerobic fermentation zone
4 Denitrification zone
5 Aeration zone
6 Diffuser
7 Final clarification zone
8 Air distribution panel
9 Air blower
10 Air distribution panel
11 Flow regulator
12 Outflow

17. The compressed air through single-bubble aeration
elements – diffusers (6)- is incorporated into aeration
zone and into airlifts for circulation and re-circulation
of the activation mixture. The air supply is from
the only mechanism in the system – air blower (9).
In the aeration zone proceed wastewater oxidation
and nitrification processes. Further, the mixture of
activated sludge flows into bottom of sedimentation
section (7), where activated sludge by
airlift is recycled into denitrification (non-aeration) or nitrification
(aeration) zone of plant.

19. European Union
The wastewater treatment plant AT with an integrated retention chamber already fulfils the highest requirements of the EU standard concerning the resistance to peak-flows and ensures the treatment stability even in case of peak-flows during emptying a bath tub + washing-machine. This is the way how the problem of flowing away the flocs of activated sludge during peak-flows can be solved by domestic wastewater treatment plants.

21. Technological parameters
The quality of the treated wastewater must comply with the requirements of The Government regulations n. 296/05 ( surface and subsurface waters). Guaranteed and normally attainable parameters in the outflow:
Parameter Average values Guaranteed values
CHOBCr 35 mg/l mg/l
BOB mg/l mg/l
SS 10 mg/l mg/l
N-NH mg/l 5,0 mg/l
Ntot 15 mg/l mg/l
Ptot mg/l 7,0 mg/l

22. Placing of the wastewater treatment plant
The wastewater treatment plant AT is placed into an excavated ditch on a concrete slab approx. 15 cm (thick) the way that the top of the tank is above the ground by approx. 5cm. When required or in accordance with the design, concrete casing is prepared round of the tank with the height specified in design documentation. The tanks of the treatment plant must be filled with water up to the outflow pipe level before backfilling the earth or making the concrete casing.

23. Installation of the AQUATEC WWTP
Assembling of the AQUATECWWTP is very simple, so customers or engineering companies will be able to assemble the plants themselves according to the charts and instructions provided by our company.

24. The location for the wastewater treatment plant must be prepared in the
manner the purified water could self discharge. The treatment plant cannot
be assembled in the place of accumulation of the rain or ground water. The
plant’s lid must be accessible for regular inspection. (1)

25. The holes for the plants assembled are excavated in two stages
The holes for the plants assembled are excavated in two stages. On the first
stage, the hole is excavated by the digger, but no up to the provided project
altitude. On the second stage, a cm layer is dug manually. This is the
way to ensure the assembling of the plant on the unmoved ground. The
depth of the hole depends on the deepening of the wastewater pipe at the
location the plant is assembled at (2).

26. The plants must be assembled on a concrete base in order to ensure
horizontal and vertical position of the plants. The thickness of the ground
embed in concrete on the thickened ground is approximately cm with
the standard reinforcing mesh. Alternatively it is possible to use the
underbodies of the reinforced concrete collars (KCD) of the required
diameter. When the level of ground water is high, the assembled plant must
be anchored to the concrete base. In this case, a binding gravel of 40 cm
thickness is poured and thickened on a concrete base prepared in advance,
and then plant’s tankage is fixed to the concrete base by means of
assembling lifting hugs. (3)

27. After placing the plant in the hole and examining its project position (depth,
horizontal and vertical positions), inflow and outflow pipelines (the pipes
must rest on firm base and stay fixed) are equipped. It is required for
diameters of the plant’s sleeves to match the diameters of the inflow and
outflow pipes for treated water. The depth of the wastewater supply pipe is
to match with the depth of the plant’s sleeve. (4)

28. The location for the air blower is selected according to the technical
requirements; the air blower can be assembled both in the air-conditioned
premises (in a garage, warehouse, etc.) and outdoor. The air blower
assembled inside the premises must be out of the contact with a wall or any
other building structure. If the air blower is to be assembled outdoor, it must
be protected from humidity, rain and dust. If the air blower was provided to
be assembled next to the plant, then an electric cable 220V- 3X1.5Cu (5)
must be lead with the household wastewater pipeline to the plant.

29. In case when the air blower is assembled inside the premises, when
installing the air-supply pipes from the air blower up to the plant, it is
required to reduce the air pressure loss to a minimum. This must be done by
reducing the number of elbows in the system. According to the technical
specifications of the air blowers, the distance from the air blower up to the
plant cannot exceed 6 m.

30. The plant placed on the project position is gradually filled with water and
the gap between the hole and the plant is filled with binding gravel (free of
solid stones). Gradually means when water is filled into the plant and
binding gravel is filled around the plant by cm layers. Binding gravel
is thoroughly thickened up to the required density. The plant is filled with
the water up to the level of the outflow pipe. (7)

31. After the assemblage of the plant is completed, specialists perform the precommissioning of the plant. The plants are entered into service by delivering the active sludge from the already running biological treatment plants (the sludge index does not exceed 150 mg/l or the sludge is not older than 20 days).When starting up the plants, the following actions are to be conducted: · After starting the air blower and opening the air valves, the air flow is directed to the air-lift pumps and aeration elements. The time is programmed and the air amount is adjusted in the plant; · A thick layer of sludge is thinned and re-pumped to the aeration zone. This must be done in the way to ensure the entire plant would not be over swamped with the sludge;
· Wastewater inflowing into the plants is initiated. (8)

32. Taking into consideration the peculiarities of the location for assembling, a
solution for discharge of the water treated is selected. The water treated in
the household wastewater treatment plant can be infiltrated into the ground
(via infiltration wells, filtration fields), discharged to the roadside,
reclamation pits, released to open water sources and reused. (9)

33. 1. Preparing of the hole for the plant

34. 2. Delivery of the plant by hands

35. 3. Installation of air-pump

36. 4. Filling up the plant with water

37. 3. Installation of air-pump

38. 6. The plant is put into operation

39. 7. Example of plant design on site

40. 8. Example of plant design on site

41. Intera Global Middle East Construction C.
Authorized Representative for the Islamic Countries
Intera Global Middle East Construction C.
Afghanistan, Kabul,
Tel.: ,
, Tel.:
UA office