Fluidized Bed Crystallization for Inorganic Wastewater Recovery
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Solution Overview
Problem
Current wastewater treatment methods using chemical coagulation/sedimentation for removing inorganic substances from industrial wastewater are costly and result in low-purity sludge that is difficult to reuse, leading to resource waste and environmental pollution.
Innovation Solution
A method employing a fluidized bed reactor with carriers like polyvinylidene fluoride (PVDF), ethylene tetrafluoroethylene (ETFE), or high-purity alumina (Al2O3) to crystallize inorganic substances from wastewater, forming high-purity crystals that can be recovered and reused, reducing the inorganic substance load in wastewater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chemical coagulation/sedimentation method is used to remove inorganic substances from wastewater, then inorganic substances can be removed and precipitated as sludge, but a large amount of chemicals are required and huge amount of sludge is produced with high treatment costs
Solution Approach 1:
The patent extracts inorganic substances from wastewater through crystallization on carrier surfaces, separating the target substance (inorganic crystals) from the treatment byproduct (sludge). This extraction approach allows direct recovery of purified inorganic substances while minimizing sludge generation, as the crystals form on carrier surfaces and can be easily separated from the liquid phase.
Solution Approach 2:
The patent changes the physical-chemical parameters of the wastewater treatment process by controlling supersaturation, temperature, and pH to induce crystallization rather than amorphous precipitation. This parameter control enables the formation of well-defined crystals on carrier surfaces that can be filtered and reused, transforming the treatment outcome from waste sludge to recoverable product.
2Quantity of substance
If chemical coagulation/sedimentation method is used to treat wastewater, then inorganic substances are removed, but the recovered inorganic substances have low purity and are difficult to reuse, leading to resource waste
Solution Approach 1:
The patent introduces carrier particles as intermediaries that facilitate the crystallization process. These carriers provide structured surfaces that guide crystal formation, ensuring that inorganic substances precipitate as well-defined crystals rather than amorphous sludge. The carriers act as templates that enhance crystal purity and facilitate easy separation, solving the problem of low purity in traditionally recovered substances.
Solution Approach 2:
The patent utilizes the phase transition from dissolved inorganic ions to solid crystal structures through controlled crystallization. By managing the supersaturation and nucleation conditions, the process transforms dissolved substances into pure solid crystals that can be filtered and reused, achieving high manufacturing precision in the recovered material.
3Quantity of substance
If chemical coagulation/sedimentation method is used, then wastewater treatment is achieved, but the treatment process requires a large amount of chemicals and will produce a huge amount of sludge, resulting in high costs
Solution Approach 1:
The patent implements a self-service approach where carrier particles from previous treatment cycles are reused as nucleation sites for new crystal formation. This eliminates the need for continuous addition of fresh chemicals, as the carriers themselves facilitate ongoing crystallization. The system becomes self-sustaining, with carriers circulating through the treatment process and continuously enabling inorganic substance removal without additional chemical inputs.
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 method effectively reduces inorganic substance concentrations in wastewater, allowing for high-purity recovery and reuse of inorganic substances, while minimizing chemical usage and sludge production, thus addressing the cost and environmental issues of traditional methods.
Implementation Method 1
making the inorganic substances in the wastewater reacting with the first reagent to form crystals, wherein the crystals are formed on the outer surfaces of the carriers
Implementation Method 2
fluidizing the carriers in the fluidized bed reactor
Data Source
AI summary
A method for removing inorganic substances from wastewater is provided. The method includes: providing a fluidized bed reactor, wherein carriers are added into the fluidized bed reactor, and the carriers includes polyvinylidene fluoride (PVDF), ethylene tetrafluoroethylene (ETFE), alumina (Al2O3) with purity more than 95 wt %, or combinations thereof; introducing the wastewater containing the inorganic substances and a first reagent into the fluidized bed reactor; fluidizing the carriers in the fluidized bed reactor, and making the inorganic substances in the wastewater reacting with the first reagent to form crystals, wherein the crystals are formed on the outer surfaces of the carriers.