Dual-Filter Ballast Water Cleaning System
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Solution Overview
Problem
Current systems for cleaning and sterilizing ballast water from ships fail to effectively remove organisms greater than 50 microns and maintain compliance with IMO regulations, leading to inefficiencies in filtration and UV sterilization processes.
Innovation Solution
A dual-filter system with a main filter and a backflush filter, where the main filter fragments larger organisms into smaller parts under higher pressure, allowing UV radiation to effectively sterilize the water, while the backflush filter with lower pressure prevents deformation and captures larger organisms, reducing silt and ensuring compliance with IMO standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single filter with high pressure difference is used to remove organisms, then filtration effectiveness is improved, but the filter becomes clogged with silt and requires frequent cleaning
Solution Approach 1:
The filter system is divided into two distinct filters: a first filter with high pressure difference (0.1-0.2 bar) to fragment organisms, and a second filter with low pressure difference (less than 0.05 bar) to capture silt. This segmentation allows each filter to perform its specific function optimally without the drawbacks of a single high-pressure filter clogging with silt.
Solution Approach 2:
Different regions of the filtration system have different pressure characteristics. The first filter area experiences high pressure difference to enable organism fragmentation, while the second filter area maintains low pressure difference to prevent silt accumulation. This local differentiation of pressure quality resolves the contradiction between filtration effectiveness and operational continuity.
2Reliability
If high pressure is applied to the filter to fragment organisms, then sterilization effectiveness is improved, but energy consumption increases
Solution Approach 1:
The pressure application is segmented across two filters: the first filter experiences high pressure (0.1-0.2 bar) to fragment organisms for effective UV sterilization, while the second filter operates at low pressure (less than 0.05 bar) to capture silt. This segmentation concentrates energy where needed for fragmentation while minimizing overall energy consumption.
Solution Approach 2:
The system changes the pressure parameter differently for different filtration stages. High pressure is applied to the first filter to enable organism fragmentation and improve sterilization effectiveness, while low pressure is maintained at the second filter to prevent energy waste and silt accumulation, thus optimizing the energy-sterilization trade-off.
3Ease of manufacture
If the backflush filter uses high pressure to remove silt, then cleaning effectiveness is improved, but organisms are deformed and trapped
Solution Approach 1:
The second filter is specifically designed with low pressure difference (less than 0.05 bar) to create a gentle filtering environment. This local quality of low pressure prevents organism deformation and trapping while still effectively capturing silt, resolving the contradiction between cleaning effectiveness and harmful effects on organisms.
Solution Approach 2:
The pressure parameter is changed to a low value (less than 0.05 bar) for the second filter to prevent organism deformation during the backflush process. This parameter change allows effective silt removal while avoiding the harmful deformation and trapping of organisms that would occur with high pressure.
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 achieves a 70% reduction in silt weight and fragmentizes organisms, making them easier to sterilize with UV radiation, thus meeting IMO requirements and optimizing power usage.
Implementation Method 1
an inlet with a pump to pump water from a water storage, such as a ballast water tank of a vessel
Implementation Method 2
a sterilizing station with one or more UV lamps to sterilize the water flow
Implementation Method 3
through a main filter to a sterilizing station
Implementation Method 4
a backflush member with a first backflush outlet to rinse the first filter element with backflush water
Data Source
AI summary
A system for cleaning and sterilizing a water flow comprises a main treatment line with a pump to pump water from a water storage, a main filter, a sterilizing station and a system outlet. The main filter is provided with a first filter element and a backflush member to rinse the first filter element with backflush water. The secondary treatment line connects to an outlet of the backflush member, and has a backflush filter to remove silt from the backflush water. The main filter is designed such that the pressure difference over the first filter element is at least 0.1 bar (10 kPa) and the backflush filter is designed such that the pressure difference over the backflush filter element is less than 0.05 bar (5 kPa).