Floating Desalination Plant Brine Diffusion
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Solution Overview
Problem
Conventional coastal desalination plants face challenges in minimizing environmental impact on marine wildlife and coastal resources, particularly due to the intake and discharge processes that can harm aquatic life.
Innovation Solution
The development of a seawater-fed reverse-osmosis desalination plant, which includes a floating desalination plant and a seabed monopile system, utilizes a closed-loop cooling system and a brine diffuser system to minimize environmental impact. The floating plant anchors to the seabed and uses a watertight tank with a seawater radiator to dissipate heat, while the seabed monopile system discharges brine near the ocean surface to allow for diffusion before reaching the seafloor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional coastal desalination plants discharge brine directly to the seafloor, then the desalination process is simple and efficient, but marine wildlife is harmed and environmental impact increases
Solution Approach 1:
The brine discharge location is moved from the horizontal plane (seafloor) to the vertical dimension (ocean surface), allowing brine to diffuse through the water column before reaching the seafloor. This dimensional change enables brine discharge while minimizing environmental impact on marine wildlife.
Solution Approach 2:
The ocean water column acts as an intermediary medium between the brine discharge point and the seafloor ecosystem. By releasing brine at the surface, the water column provides a diffusion pathway that dilutes and disperses the brine before it reaches sensitive marine habitats.
2Object-affected harmful factors
If a floating desalination plant is used, then environmental impact is minimized and remote operation is enabled, but device complexity and initial cost increase
Solution Approach 1:
The desalination plant is divided into modular components (reverse osmosis units, cooling systems, control systems) that can be independently installed and maintained on the floating platform. This segmentation reduces overall system complexity while enabling remote operation and minimal environmental impact.
Solution Approach 2:
Manual operation and monitoring are replaced with automated control systems and remote monitoring technology. This substitution reduces the need for complex mechanical intervention systems while enabling the floating plant to operate autonomously in remote locations.
3Reliability
If reverse-osmosis tubes are cooled using a closed-loop system, then membrane performance is maintained, but energy consumption increases
Solution Approach 1:
The cooling system uses the plant's own operational requirements (seawater intake and processing) to provide cooling for the reverse-osmosis membranes. The system recycles thermal energy from the desalination process itself, reducing external energy input while maintaining membrane performance.
Solution Approach 2:
The cooling system utilizes phase change of water (liquid to vapor or vice versa) to transfer heat efficiently from the reverse-osmosis membranes. This phase transition mechanism provides effective cooling with minimal energy input compared to conventional heat exchange systems.
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
This solution effectively reduces the environmental impact by minimizing direct discharge to the seafloor and allowing brine to diffuse through the water column, thus protecting marine wildlife. Additionally, the remote operation capabilities via SCADA systems enhance efficiency and reduce on-site environmental disturbances.
Implementation Method 1
reverse-osmosis tubes housed within the watertight tank and configured to process the seawater passing through the reverse-osmosis membrane to freshwater water stream and a brine water stream
Implementation Method 2
circulates water or fluid inside the watertight tank to cool the reverse-osmosis tubes and transfer the heat to a seawater radiator
Implementation Method 3
seawater radiator mounted on the exterior of the barge to cool the cooling water or fluid
Implementation Method 4
seawater radiator mounted on the exterior of the barge to cool the cooling water or fluid
Implementation Method 5
seawater feed pump sucking in seawater through wedge wire screens attached to an inlet or inlets in the hull of the barge
Data Source
AI summary
A desalination system includes a watertight tank built into a barge to house reverse-osmosis tubes and flooded with cooling water or fluid a closed-loop water or a fluid circulation system that circulates water or fluid inside the watertight tank to cool the reverse-osmosis tubes and transfer the heat to a seawater radiator mounted on the exterior of the barge to cool the cooling water or fluid; a reverse-osmosis system consisting of a seawater feed pump sucking in seawater through wedge wire screens attached to an inlet or inlets in the hull of the barge, and pumping that water into a plurality of reverse-osmosis tubes housed within the watertight tank and configured to process the seawater passing through the reverse-osmosis membrane to freshwater water stream and a brine water stream; and a high-density polyethylene (HDPE) pipeline.