The Design Of Hydroxyl Radical-based Ship Ballast Water Treatment Control System

With the development of the world’s shipping industry, the foreign ships’ ballast water problems caused by biological invasions, the marine ecological environment is facing more and more serious problems. Many countries and organizations committed to the development of ships’ ballast water treatment system, the process take a lot, including the mechanical, physical, chemical, and have achieved some success, but those still have lots of limitations, such as small scope, secondary pollution, hull corrosion, high energy consumption, poor security shortcomings and so on. Hydroxyl radicals as a symbol of advanced Oxidation sterilization technology, achieves great concern.The Institute for Environmental Studies of strong electric field ionization discharge Preparation of hydroxyl radicals used in the handling of ship ballast water test at a university, using atmospheric pressure strong electric field ionization of oxygen and water, which can manufacture hydroxyl radical solution without pollution. Design the control system of ships’ ballast water treatment hierarchy based on the subject, PLC is responsible for the collection of data and the implementation of control, Man-machine interface manage the workflow of the entire system. with the collaboration of Upper and lower machine, To effectively regulate the concentration of hydroxyl radicals, The system use Fuzzy control method to control the total residual oxidant concentration, and then achieve the purposes of sterilization., Residual oxidant will be processed, Substances involved in the reaction will not damage the hull, the treated ballast water indicators can reach the emission standards of the provisions of the International Maritime Organization (IMO).This article is based on the ballast water treatment of hydroxyl radical to analyze and design the control structure, which can effectively monitor and control the ballast water treatment processing. Its visualization and intelligent features is designed to facilitate crew members to learn and operate. The system also has an alarm and emergency response systems to protect the safety of the procedure, use communications technology to connect with integrated bridge systems, and make it further achieve the integration of ship-shore information.