Automation of the technological processes of wastewater treatment: case study of the Minsk wastewater treatment plant of UE Minskvodokanal

Summary

The experience of UE Minskvodokanal in developing and establishing of automated control systems for the technological process of wastewater treatment is presented using the example of several structures of the Minsk wastewater treatment plant. The goals and tasks performed by the automated process control systems at the plant are described. The structure and operating modes of the implemented systems are presented. The stages of the wastewater treatment process are considered in detail: screening, sand removing and processing, supplying and distributing air across sections of the aeration tanks. As part of the automation of the presented treatment stages, the general design of the automated process control system is described, the operating features, the objects used and automation modes are given. Special attention is paid to the need for simple and reliable control algorithms. The ultimate goal of upgrading the automated process control system of the Minsk wastewater treatment plant is the maximum degree of automation and supervisory control covering the entire technological chain of wastewater and sludge treatment based on the simple and reliable principles.

Key words

wastewater , screens , sand catchers , algorithm of control , SCADA-system , aeration tanks , automation of technological processes , work station

Automated System of Control over Technological Process of Filtration

Summary

It is told about the stage-by-stage realization of the project of automation of the filtration process at the pumping-filtering station of the city of Novosibirsk. In the first place equipment of automated monitoring of parameters of the filtration process and equipment were introduced. The stage-by-stage introduction of the automation system on the basis of monitoring results makes it possible to optimize the process of filters washing. Owing to the correct adjustment of fittings and control elements it is possible to reduce the quantity of wash water by 18%. The second component of reducing wash water consumption is the optimization of a period of filters washing. By the parameters controlled (head loss, turbidity, capacity, position of valves during the washing) it is possible to increase the time of a filtering cycle by about 2 times which reduces water consumption for filters washing. The developed solutions of the stage-by-stage introduction of automation of control over the technological process make it possible to use them at analogous filtering facilities.

Key words

filtration cycle , automated control system , algorithm of control , automation means , hydrodynamic resistance