Walnut Shell Filter with Metal Hydroxide Nanoparticles for TOC and Silica Removal
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Solution Overview
Problem
Current wastewater treatment technologies for SAGD processes, particularly those involving steam-assisted gravity drainage, are inadequate in removing high levels of total organic carbon (TOC) and silica, leading to environmental contamination and increased operational costs due to the need for additional separation processes and equipment.
Innovation Solution
A filter medium is developed by anchoring metal hydro(oxide) nanoparticles, such as iron or aluminum, to walnut shell particles, enhancing their sorption capacity for TOC and silica through a thermal hydrolysis process, which improves the efficiency of walnut shell filtration without significantly impacting wastewater flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wastewater treatment technologies are used, then the treatment process is simple, but the removal efficiency of TOC and silica is insufficient
Solution Approach 1:
The patent combines metal hydro(oxide) nanoparticles with nut shell particles to create a composite filter medium. The metal component provides high sorption capacity for TOC and silica, while the nut shell provides structural support and filtration capability, achieving enhanced removal efficiency without requiring multiple separate treatment processes
Solution Approach 2:
The nut shell particles provide a porous structure that facilitates wastewater flow while providing surface area for contaminant adsorption. The porous nature allows the filter medium to maintain good wastewater flux while effectively removing contaminants through the metal nanoparticle sorption sites
2Reliability
If additional separation processes and equipment are added to improve contaminant removal, then the removal efficiency increases, but the operational costs increase
Solution Approach 1:
The metal hydro(oxide) nanoparticle-modified nut shell filter medium performs multiple functions simultaneously: it filters suspended solids, adsorbs TOC, and removes silica. This multi-functionality eliminates the need for separate treatment processes for each contaminant type, thereby reducing operational costs while maintaining high removal efficiency
Solution Approach 2:
The patent merges several treatment functions into a single filter medium by combining the physical filtration capability of nut shells with the chemical sorption capacity of metal hydro(oxide) nanoparticles, creating an integrated solution that reduces both equipment requirements and operational expenses
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 modified walnut shell filter medium effectively removes up to 85% of TOC and silica from SAGD wastewater, reducing the need for additional separation processes and potentially lowering operational costs by integrating into existing treatment systems.
Implementation Method 1
The filter medium includes a nut shell particle having a metal hydro(oxide) nanoparticle bonded to a surface thereof... such that the contaminants adhere to the metal hydro(oxide) nanoparticle
Implementation Method 2
heating the mixture to promote a thermal hydrolysis reaction which generates a metal hydro(oxide) nanoparticle bonded to a surface of the nut shell medium
Data Source
AI summary
A filter medium for removal of contaminants from wastewater. The filter medium includes a walnut shell particle having a metal hydro(oxide) nanoparticle bonded to the surface of the nut shell particle. The filter medium is particularly useful for treating produced water and wastewater generated in steam-assisted gravity drainage (SAGD) in recovery of hydrocarbons from oil sands to remove total organic carbon and silica. Processes for preparing the filter medium and for treating wastewater using the filter medium are also provided.