Industrial wastewater treatment PLC control
As a city more categories of industrial wastewater discharge, therefore municipal sewage treatment is a very complex and large projects. Sewage in BOD, COD, SS, alkali and organic phosphorus, I hope, chlorides, sulfides, oil, benzene, Peter triclosan B, methanol concentration higher Tongxinluo ions. If not treated directly emissions not only affect the health of people and endanger agricultural and industrial production, but also serious pollution of natural water, it is necessary to carry out comprehensive treatment of sewage, and to make it reach the state emission standards. Wastewater treatment plant as an example to illustrate the process and the implementation of the programme. As shown, the sewage was removed rough grid, and then into the aeration sedimentation tanks, sand suction aspiration of the desilting machines to the separator, desilting together with the water discharged into the trough lose sand, sand and dealt with, Then the sewage into the aeration tanks, aeration pond with dissolved oxygen detector, according to the changes in water quality and sewage dissolved in regulating the content of the feed rate control, then the middle sedimentation tanks, and to the final sedimentation processes, such as multi-channel scratch mud, Desanding, regulating access of dissolved oxygen, the sewage reached state emission standards.
At present sewage treatment in the PLC control system has been widely applied at home and abroad. The industrial design of the sewage purification process for the treatment system:
Press the start button and up and running blender;
The open-purification tank valve, the inflow of industrial nap purification tank, and to detect flow;
The water level in the normal range, and begin measuring pH and temperature measurement;
Flow, pH and temperature digital signal gave PLC, and in the processing, as well as temperature-regulating valve opening of the regulation;
Detection and regulate water drainage valve, the control handle from the water.
Key words: sewage treatment PLC Control System