The supplied device is used for the treatment of technological wastewater generated in the production plant during the washing of equipment and machines after the completion of the product batch. The device was delivered in 2019.
Since water is not formed uniformly during the day, but only after the batch, the most adequate solution is physico – chemical treatment with mechanical dehydration of sludge. The device is compact and completely housed in a steel container, with a capacity of 5 m3/day.
The device consists of an equalization tank, a pump that pumps water into the physico – chemical reactor, a dosing station for dosing chemicals, a sludge tank, a filter press for sludge dehydration and a control cabinet. Technological wastewater contains paints for the food industry, other paints and adhesives.
The physico – chemical treatment technology is described in point 1.1.3. After purification, the water is discharged into the pumping shaft where it is connected to the municipal water and discharged into the sewerage network.
Gravitational sedimentation of sludge occurs in the sludge tank, which is pumped to the chamber filter press, which serves to dehydrate the sludge. Dehydrated sludge can be disposed of in accordance with the law, and the filtered water is returned to the receiving tank.
The filter press consists of a frame on which the plates with the filter blades are placed, a hydraulic system that serves to create pressure between the plates and their separation, and the plates of the control system. The operation of the filter press is based on the principle of separating water from the sludge using pressure filtration. The semi-automatic mode is characterized by the possibility of connecting the filter plates by means of an electrically driven hydraulic unit.
The mechanism of operation of the press is as follows:
- after a certain initial pressure is created between the plates, the pumping of sludge into the filter press begins. By pumping the sludge, its even distribution on the press plates is achieved, and with the necessary pressure, water is released, ie solids accumulate on the filter cloth. The sludge is pumped until the chambers of the filter press are completely filled, which can be recognized by the high pumping pressure. After pumping is complete, the existing pressure maintains the drainage of water from the sludge for a certain period of time. The cessation of squeezing marks the end of filtration, and then it is necessary to separate the plates, remove the cake formed on the filter cloths and wash the cloth plates.
