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Application of informational systems in the operation and optimization of biological wastewater treatment plants (SCADA)

Author: CIOBANU Natalia
Degree:doctor of engineering
Speciality: 05.23.04 - Water Supply, Sewerage System Construction, Water Resources Protection Systems
Scientific adviser: Dumitru Ungureanu
doctor, professor
Scientific consultant: Nicolae Secrieru
doctor, associate professor (docent), Technical University of Moldova
Institution: Technical University of Moldova


The thesis was presented on the 23 April, 2021
Approved by NCAA on the 30 July, 2021


Adobe PDF document2.51 Mb / in romanian


CZU 628.35:004.9 (478) (043.3)

Adobe PDF document 15.82 Mb / in romanian
190 pages


wastewater, active sludge, biological treatment, treatment plant, mathematical modeling, automated control, optimization, adjustment techniques, SCADA system, fuzzy rules


Thesis structure: annotation, introduction, four chapters, conclusions and recommendations, bibliography (148 titles), 125 basic text pages, 56 figures and 17 appendices. The research results are published in 10 scientific papers.

Actuality of the research is the development of a concept for automated control of biological treatment processes with activated sludge in different treatment conditions, which will enable making decisions in real time.

Aim of the research: improvement of biological wastewater treatment plants by implementing an automated system to manage and keep under control activated sludge treatment processes. Objectives of the research: to make a comprehensive and thorough analysis of the scientific literature available internationally in order to implement the existing mathematical models that describe the process of biological treatment with activated sludge; to analyse the technological parameters of the biological wastewater treatment process and the operating parameters of the facilities in the Chisinau wastewater treatment plant; to analyse the concept and structures of automatic management of the treatment process, and to provide recommendations on the creation of a database aimed at the development of the Supervision, Control and Acquisition Data Systems (SCADA); to propose the implementation of a system that will control and record the quality of wastewater at the input and output from the process, taking into account the operational management, the system of measurement, the monitoring, warning and intervention, and especially, the process of biological treatment; to develop methods that will regulate the process of biological treatment in compliance with the technological parameters outlined in the specifications that underlie the project aimed at the renovation of the Chisinau Biological Wastewater Treatment Plant, which will reduce the negative impact generated by wastewater treatment process, increasing the degree of environmental protection and human health in accordance with the Water Supply and Sanitation Strategy of the Republic of Moldova for 2014-2030;

Scientific novelty and originality of the research consists in the application of effective mathematical models, describing the process of biological wastewater treatment with activated sludge, providing for the creation of a database and the development of strategies to control the operation of facilities, monitoring the parameters of the treatment process through a system for measuring, monitoring, warning and intervention, which will take into account the systematic assessment of the dynamics of the qualitative characteristics of the pollutants (input – output) from a wastewater treatment plant.

The present research provides solutions to the scientific problem related in the implementing of a new concept for the management of biological treatment processes with activated sludge to protect the environment, especially the aquatic environment, in particular, discharges of consumer and industrial wastewater through mechanical-biological treatment method.

Theoretical significance and applicative value of the thesis has been achieved by providing the following technical solutions based on mathematical models of biological wastewater treatment processes: monitoring the quality parameters of wastewater, ensuring remote data transmission; a model regulating the process of biological treatment, using a set of fuzzy rules has been developed; a management system has been created based on the optimization of technological parameters of the process of biological treatment with activated sludge; application of informational systems in the operation and optimization of biological wastewater treatment plants – SCADA.

The implementation of scientific results was carried out at the Chisinau Biological Wastewater Treatment Plant, which was at the basis of the project aimed at the renovation and modernization of the station. The results obtained are a starting point for new research in the field. The results of the research will be disseminated in the form of scientific presentations in conferences, congresses, and teaching material.