Fumed Silica Wastewater Coagulation via Composite Flocculants
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Solution Overview
Problem
Current methods for treating fumed silica-containing drainage water are inefficient and unstable, leading to contamination and operational challenges due to the difficulty in coagulating and separating fine silica particles, with existing methods either causing adhesion to vessels or failing to effectively reduce turbidity.
Innovation Solution
A method involving dispersing fumed silica into water, adjusting its concentration to 0.05-3.0 mass %, and adding an inorganic flocculant containing a metal, followed by an organic polymer flocculant, to achieve stable coagulation and efficient separation of fumed silica from drainage water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fine particles are coagulated to be treated, then the fine particles can be collected and disposed of, but the coagulated product may adhere to a vessel or apparatus, reducing operation efficiency
Solution Approach 1:
The patent changes the chemical parameters of the flocculant by specifying precise molecular weight ranges (10,000-1,000,000) and charge density ranges (0.1-10 mmol/g), as well as controlling the dosage (0.01-10 mg/L). These parameter optimizations enable effective coagulation of fumed silica particles while preventing adhesion to vessels, thus resolving the contradiction between coagulation stability and operation efficiency
Solution Approach 2:
The patent employs a composite flocculant system combining organic polymers with specific functional groups (carboxyl, sulfonate, phosphate) and controlled charge densities. This composite approach creates flocculants that can simultaneously achieve stable coagulation and anti-adhesion properties, addressing both the reliability and productivity concerns
2Ease of manufacture
If conventional flocculants are used to treat fumed silica-containing drainage water, then treatment can be performed, but the turbidity of water cannot be fully reduced
Solution Approach 1:
The patent achieves superior turbidity reduction by optimizing critical parameters: molecular weight (10,000-1,000,000), charge density (0.1-10 mmol/g), and dosage (0.01-10 mg/L). These parameter ranges enable the flocculant to effectively capture fine fumed silica particles that conventional flocculants cannot remove, reducing turbidity to nearly complete clarity while maintaining simple treatment procedures
Solution Approach 2:
The patent introduces flocculants with specific local chemical properties (functional groups such as carboxyl, sulfonate, phosphate) that are particularly effective at binding to silica particle surfaces. This localized chemical functionality enables precise targeting of fumed silica particles, achieving complete turbidity reduction without requiring complex treatment processes
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 approach allows for stable and efficient coagulation and separation of fumed silica, reducing turbidity to a level where treated water can be recycled or discharged without secondary treatment, while preventing environmental contamination.
Implementation Method 1
including an inorganic flocculant containing a metal into fumed silica-containing drainage water... and adding an organic polymer flocculant
Implementation Method 2
a method of treating drainage water containing fumed silica collected by dispersing fumed silica which will become waste into water
Data Source
AI summary
In a process for treatment of powdery fumed silica, fumed silica to be discarded is collected by dispersing the fumed silica in water. Disclosed is a method for treatment of a fumed silica-containing wastewater collected in the process. The method comprises the steps of: adding an inorganic coagulant containing a metal to a fumed silica-containing wastewater in an amount of 15 to 300 mg/l. in terms of the metal, wherein the wastewater is either a wastewater containing fumed silica at a concentration of 0.05 to 3.0% by mass or a wastewater whose fumed silica content is adjusted to 0.05 to 3.0% by mass; and adding an organic polymeric coagulant to the mixture.