aquaimpex
Products » WWTP » Domestic WWTP
Purpose

Plant is used for wastewater treatment of small sources as family houses, cottages, week-end houses, and the like that cannot be connected to municipal sewerage system. It purifies wastewater usually produced by households including bathrooms, washing machines, dishwashers, washrooms and others. Domestic wastewater treatment plants (abbreviated as "DC") are designed to serve up within the range of 2 to 25 PE (Population Equivalent).

Description of design

Reactor of domestic wastewater treatment plant is a cylindrical plastic shell integrated with conical sedimentation - separation tank and aeration system including a compressor (blower). Final sedimentation tank divides the reactor in two sections: inflow (activating, denitrification) and outflow (sedimentation). Wastewater flows in the activation zone through a debris trap catching mechanical debris. Then it is mixed with activated sludge when microorganisms, within the sludge, start acting on substances in wastewater thereby starting the treatment processes. In sedimentation tank water is separated from sludge and flows out through an effluent through and sludge is pumped back to the first section with an air-lift pump.

Structural drawing


Basic Specifications
Domestic Plants (DC)
DC 4
DC 8
DC 12
DC 18
DC 25
Population to serve up
EO
2-5
6-10
11-14
15-22
23-26
BOD load
kg/day
0,12-0,30
0,36-0,60
0,66-0,84
0,90-1,32
1,38-1,56
Wastewater amount
m3/day
0,4-1,0
1,0-2,0
1,0-2,8
2,2-4,4
2,2-5,2
Power input
W
90
135
200
370
550
Gross weight
kg
200
350
350
500
500
Height of inflow
A
mm
1,62
1,72
1,72
2,12
2,12
Height of outflow
B
mm
1,32
1,42
1,42
1,82
1,82
Shell height
C
mm
1,52
1,62
1,62
2,02
2,02
Shell diameter
D
mm
1,6
2,1
2,1
2,3
2,3

Conditions for embedding in terrain

When installing a domestic wastewater treatment plant few basic rules have to be followed. These are important for trouble-free treatment plant operation and to avoid any damage in operation due to a wrong installation.
  • Treatment plant can be installed in building lower basement or buried in terrain, e.g. on a garden. In installation the gravity inflow and outflow have to be kept. A plastic shell extension can applied with respect to the sewerage depth. Underground water level limits the burying of the unit under terrain, if the level is too high it can damaged the unit. In this case the manufacturer has to be consulted. The bottom is made of concrete to be smooth and without sharp projections. The unit is positioned on the base plate and footing is reinforced with a ring.
  • Then water is allow to flow in and fine, loose material (sand, soil) is filled around the unit.
  • Inflow and outflow are attached. Compressed air is connected to aeration system. A compressor has to be installed in such a place where it is not exposed to weather. It can be positioned in a cellar and a hose is used for air supply and/or it can be positioned in a plastic shell extension. 12 - 15 m makes the maximum hose length.
  • Safety precautions: the plant reactor has to be covered. The cover has to be detachable to allow to inspect the plant operation, from time to time, and maintenance. The cover could be fitted with a safety lock.
Terms and Conditions

Technological structure includes: plastic inside structure of treatment plant, blower including air hoses and aeration system, timer.
Time of delivery makes 2-5 weeks after confirming a binding order and to settle an advance on a price amounting to 50 % of the total price. Guarantee period makes 12 months after commissioning or in maximum 18 months after the treatment plant delivery.
Do not use household crushers, for easier maintenance a pressure water valve should be near available.

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