Ballast Water ORP Control for Chlorine Neutralization
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Solution Overview
Problem
Shipboard ballast water management systems face challenges in maintaining optimal chlorine concentrations due to varying nitrogen compound levels in seawater, leading to potential corrosion and the formation of undesirable disinfection by-products, as existing systems do not effectively regulate chlorine demand across different ports and seasons.
Innovation Solution
A ballast water management system that includes an electrolytic cell with a power supply to generate chlorine-based biocides, an ORP sensor to monitor oxidation-reduction potential, and a neutralization system to adjust biocide levels, ensuring effective disinfection while minimizing corrosion and by-product formation by regulating the flow rate and introducing a neutralizing agent based on measured ORP values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chlorine-based biocides are generated and introduced into ballast water to disinfect and prevent aquatic nuisance species, then biological activity is inhibited and species introduction is prevented, but corrosion of ship systems and formation of disinfection by-products increases
Solution Approach 1:
The system continuously monitors oxidizer concentration and adjusts biocide generation and neutralization based on real-time measurements, creating a closed-loop control system that maintains optimal disinfection levels while preventing excessive chlorine accumulation that causes corrosion and by-product formation
Solution Approach 2:
The system dynamically adjusts the concentration and dosage parameters of chlorine-based biocides based on ballast water conditions, using multiple neutralization modes (high, medium, low) to optimize the balance between disinfection effectiveness and corrosion prevention by changing chemical parameters adaptively
2Reliability
If high chlorine concentration is used to ensure effective disinfection across varying port conditions, then biological activity is consistently inhibited, but corrosion acceleration and by-product formation increase
Solution Approach 1:
The system transitions from static high chlorine dosing to dynamic adjustment of biocide concentration, using real-time monitoring and multiple neutralization modes to adapt chlorine levels to actual disinfection needs, ensuring consistent biological inhibition while minimizing harmful effects through variable parameter operation
Solution Approach 2:
The system applies partial neutralization rather than complete elimination of chlorine, using high, medium, and low neutralization modes to maintain sufficient disinfection levels while preventing excessive chlorine accumulation, achieving effective biological control without the harmful effects of over-chlorination
3Adaptability or versatility
If variable chlorine demand is addressed by increasing biocide concentration, then disinfection effectiveness is maintained across different ports, but corrosion risk and by-product formation increase
Solution Approach 1:
The system uses real-time monitoring of oxidizer concentration and ballast water characteristics to adjust biocide generation rates, creating a feedback-controlled adaptive system that responds to varying port conditions without consistently applying excessive chlorine that would cause corrosion and by-product formation
Solution Approach 2:
The system changes operational parameters including biocide concentration, dosage timing, and neutralization level based on measured ballast water conditions, using multiple neutralization modes to adapt to different port requirements while maintaining the corrosion-by-product threshold below harmful levels
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system maintains effective disinfection of ballast water while reducing the risk of corrosion and by-product formation, ensuring safe biocide concentrations are maintained regardless of port conditions, thus preventing the introduction of aquatic nuisance species and minimizing ecological impact.
Implementation Method 1
an electrolytic cell with at least one anode and at least one cathode, a power supply disposed to supply direct current through at least one anode and at least one cathode to generate the biocide
Implementation Method 2
an oxidation-reduction potential (ORP) sensor configured to determine an ORP value of the ballast water to be discharged
Implementation Method 3
a neutralization system configured to introduce a neutralizing agent selected to at least partially neutralize the biocidal activity of the biocide into the discharge ballast water
Data Source
AI summary
Techniques and systems for neutralizing discharge waters from ballast and/or cooling water biocidal treatment and disinfection systems are provided. The systems utilize, inter alia, oxidation reduction potential control to regulate the dechlorination of an electrocatalytically generated biocidal agent to allowable discharge levels in ship buoyancy systems and ship cooling water systems.