Study of TRO sensor characteristics during operation of ballast water treatment system
DOI:
https://doi.org/10.34185/1562-9945-5-161-2025-06Keywords:
Ballast water treatment system, total residual oxidant sensor, automatic control system, programmable logic controller, deballastAbstract
Ballast water and sediments contain a large number of bacteria, plants and animals that can be transferred to water systems in other regions. To reduce the anthropogenic impact on the ecology of water systems, in accordance with the IMO International Convention “Pro-tection and Management of Ships’ Ballast Water and Sediments”, the implementation of ballast water treatment systems (BWTS) on board ships has become mandatory. Based on a comparative analysis of the methods and technologies used in BWTS, it was found that the most effective and efficient method is one that combines different technologies and enables two-stage treatment and disinfection of ballast water to the level of the D-2 standard.
To monitor the compliance of purified water with the D-2 standard and the efficiency of the BWTS operation, the TRO (total residual oxidant) concentration indicator is used, which is measured by a special sensor that determines the total content of disinfectants in water. The reliability of the TRO sensors remains insufficiently high, which necessitated experimental studies of their characteristics during the operation of the BWTS Electro-Cleen™ System in all modes of its operation (ballast, deballast and stripping). In the BWTS ECS, the photometry method with the DPD reagent is used to measure TRO for colorimetric determination of the oxidant concentration in ballast water.
To improve the quality of monitoring and increase the reliability of the BWTS ECS op-eration, the authors proposed to introduce an additional control loop into the system using the Mitsubishi PLC FX1S-14MT-001. The programming of the proposed PLC was carried out using the ALPHA PROGRAMMIMNG software.
The results of the research can be used to analyze control processes and optimize the ballast water treatment systems of sea vessels.
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