Clarification Process of WSB® clean pro.
The basic clarification process of WSB® clean pro occurs in four different cleaning stages. Every stage performs a very tangible cleaning activity, in order to fully biologically clarify the sewage.
The basic clarification process of WSB® clean pro occurs in four different cleaning stages. Every stage performs a very tangible cleaning activity, in order to fully biologically clarify the sewage.
The first stage in the clarification process is the sludge accrual tank. It collects the primary sludge before the domestic waste water reaches the pre-clarification. Here, the sinkable materials are held back. The mechanically pre-processed waste water is now fed to the biological clarification stage. Its fully biological clarification principle is based on the biofilm process. Micro-organisms settle on plastic carrier material and take on the organic load in the waste water in order to change it into ecologically harmless metabolism products. The carrier material is based on polyethylene and has a specific surface of less than 350 or up to 500 m²/m³.
Oxygen is needed for the clarification process. This compressed air is produced by means of a compressor and distributed in the waste water as fine bubbles by a membrane pipe aerator. Through that procedure, surplus and/or dead micro-organisms are removed and subsequently collected as sludge in the final sedimentation tank, from where the transport into the sludge accrual tank occurs in a time-controlled manner. It being the last step in the cleaning process, the bottom of the final sedimentation has a truncated cone or sludge-collecting gutter where the occurring sludge is collected and removed by immersion pumps or other sludge-removing systems. From the final sedimentation, the biologically cleaned waste water finally reaches the runoff ditch via a discharge device.
WSB® clean pro is equipped with a control unit for the power supply as well as the automatic control of the compressor and immersion pumps in the final sedimentation. In order for the optimal operation to occur at minimum energy consumption, the aerator works intermittently, with changing operation and recess times. The actual operating parameters can be precisely defined taking into account the varying waste water accruals during the course of the day. The operational cycle of the immersion pump is designed so that the pending clarification sludge is completely pumped out of the biological cleaning tank.
As a result of nitrification, the formation of floating sludge may occur in the final sedimentation. In order to prevent sludge drifting, WSB® clean pro is equipped with a floating sludge extraction system. In the corresponding sludge accrual tank there is capacity for approx. three to four months of accrual. For this time period, the total sludge accrual is approx. 0.96 l/(E*d). The precise sludge accrual time is dependent on the degree of utilization and is subsequently determined during operation.
