Fluidized Bed Crystallization Softening for High-Salinity Water
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Solution Overview
Problem
Existing water treatment systems for high-salinity water face challenges such as long hydraulic retention times, low treatment efficiency, and issues with uneven crystal particle size and potential crystal loss during calcium bicarbonate crystallization, particularly in fluidized beds.
Innovation Solution
A system and method for self-induced calcium bicarbonate crystallization in a fluidized bed, utilizing a fluidized bed-based crystallization-softening reaction unit with a mixing, reaction, transition, and clarification module, along with a dosing and regulation unit, which includes a programmable logic controller for automated operation, to achieve uniform crystal formation and reduce hydraulic retention time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional water treatment systems are used for high-salinity water softening, then treatment can be achieved, but hydraulic retention time is long and treatment efficiency is low
Solution Approach 1:
The patent changes the chemical parameters by adjusting pH to promote calcium bicarbonate crystallization, and changes the physical parameters by using fluidized bed technology to intensify mass transfer and reaction efficiency, thereby reducing hydraulic retention time while maintaining treatment effectiveness
Solution Approach 2:
The patent replaces traditional mechanical filtration and sedimentation systems with a chemical crystallization system based on calcium bicarbonate precipitation, enabled by pH adjustment and fluidized bed technology, achieving more efficient treatment
2Productivity
If calcium bicarbonate crystallization is performed in fluidized bed, then treatment efficiency improves, but crystal particle size becomes small and loss increases
Solution Approach 1:
The patent optimizes operational parameters including pH value, flow rate, and residence time to control crystal growth, achieving larger crystal particle sizes that reduce loss during subsequent handling and dewatering operations
Solution Approach 2:
The patent implements a feedback control system that monitors crystal formation and adjusts operational parameters in real-time to maintain optimal crystal size distribution, preventing excessive crystal loss while maintaining high treatment efficiency
3Manufacturing precision
If additional seed crystals are introduced to control crystal size, then crystal uniformity improves, but system complexity increases
Solution Approach 1:
The patent employs self-induced crystallization where the fluidized bed system itself promotes uniform crystal formation through controlled supersaturation and mass transfer, eliminating the need for external seed crystal addition and reducing system complexity
Solution Approach 2:
The patent uses pH adjustment and fluidized bed dynamics to create uniform supersaturation conditions throughout the reactor, enabling self-organized crystal nucleation and growth that produces uniform particle size distribution without additional seeding
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 effectively increases calcium bicarbonate crystal size, reduces potential loss, and enhances treatment efficiency by promoting stable fluidization and automated control, simplifying dehydration and reducing labor costs.
Implementation Method 1
promote the equilibrium of carbonate ionization and hydrolysis to shift toward the formation of bicarbonates through pH adjustment, thereby enabling the softening of high-salinity water (i.e., reverse osmosis concentrate) through calcium bicarbonate crystallization
Implementation Method 2
the concentration of free calcium bicarbonate in water is not lower than this value, it indicates that calcium ions and bicarbonate ions in the water tend to transition from an unsaturated state to a metastable or supersaturated state, meeting the prerequisite for the spontaneous formation of calcium bicarbonate crystal nuclei and subsequent crystallization
Implementation Method 3
a fluidized bed-based crystallization-softening reaction unit... induce a crystallization reaction to soften a saline water
Data Source
AI summary
A system for softening high-salinity water via self-induced calcium bicarbonate crystallization in a fluidized bed, including a fluidized bed-based crystallization-softening reaction unit, a water feeding unit, a dosing unit and a regulation unit. The fluidized bed-based crystallization-softening reaction unit is configured to induce a crystallization reaction to soften high-salinity water. The water feeding unit is configured to supply high-salinity water to the fluidized bed-based crystallization-softening reaction unit. The dosing unit is configured to supply a pH regulating agent to the fluidized bed-based crystallization-softening reaction unit. The regulation unit is configured to perform reflux replenishment for the fluidized bed-based crystallization-softening reaction unit and recover escaping crystals. A high-salinity water softening method using such system is also provided.