Carbonaceous Fines Beneficiation Using Micro-Algae Binders
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Solution Overview
Problem
Coal and charcoal fines are often wasted and pose environmental hazards due to their small size and contamination of water systems, and existing agglomeration processes rely on petroleum-derived binders or harsh conditions.
Innovation Solution
Microalgae are cultivated in an aqueous medium and adsorbed onto carbonaceous fines, serving as a binder for agglomeration into briquettes or pellets without additional binders, while also addressing water purification by removing microalgae from polluted water systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If petroleum-derived binders are used for agglomeration of carbonaceous fines, then stable and robust briquettes or pellets are produced, but environmental pollution and dependency on non-renewable resources increase
Solution Approach 1:
The patent uses microalgae biomass, a renewable and biodegradable material, to replace persistent petroleum-derived binders. The microalgae serve as a temporary binding agent that fulfills its function during agglomeration and then degrades naturally, eliminating long-term environmental pollution while maintaining product stability during use.
Solution Approach 2:
The patent changes the chemical composition parameter of the binder from synthetic petroleum derivatives to natural microalgae biomass. This parameter change transforms the binder's properties to be environmentally friendly while maintaining or improving binding effectiveness through the microalgae's cell wall structures and natural adhesion properties.
2Strength
If harsher processing conditions (higher pressures and temperatures) are employed for agglomeration without binders, then stable briquettes or pellets are produced, but energy consumption and equipment requirements increase
Solution Approach 1:
The patent introduces microalgae as an intermediary binding agent that facilitates agglomeration under milder conditions. The microalgae act as a mediator between the carbonaceous fines particles, providing natural adhesion that reduces the need for extreme pressures and temperatures, thereby lowering energy consumption while still producing stable agglomerates.
Solution Approach 2:
The microalgae biomass provides self-binding properties through its natural cellular structures and surface characteristics. This self-service capability of the microalgae to bind particles together eliminates the need for external binding agents and reduces reliance on high-energy processing conditions, enabling stable agglomerate formation under more energy-efficient conditions.
3Quantity of substance
If conventional techniques (sedimentation, filtration) are used to remove micro-algae from water, then water purification is achieved, but the small size of micro-algae makes the process complex and less effective
Solution Approach 1:
The patent converts the harmful presence of microalgae in water (which causes pollution) into a beneficial resource by using the microalgae themselves as binders for carbonaceous fines agglomeration. This approach eliminates the need for complex removal processes while simultaneously addressing water purification, as the microalgae are utilized rather than discarded.
Solution Approach 2:
The microalgae serve multiple functions: they act as binding agents for carbonaceous fines agglomeration and simultaneously serve as the target substance for water purification. This multi-functionality simplifies the overall process by combining what would otherwise be separate operations into a single integrated system where the same material serves dual purposes.
4Loss of substance
If carbonaceous fines are deposited in ponds as slurry for stabilization, then the fines are stored, but economic loss occurs and environmental hazards (spontaneous ignition, groundwater contamination) arise
Solution Approach 1:
The patent converts the waste carbonaceous fines, which pose environmental hazards when stored in ponds, into a valuable agglomerated fuel product. By using microalgae as binders to create stable briquettes or pellets, the fines are transformed from a harmful waste stream into a beneficial energy resource, eliminating both economic loss and environmental risks associated with pond storage.
Solution Approach 2:
Instead of discarding carbonaceous fines into storage ponds where they cause environmental problems, the patent recovers and utilizes these fines by agglomerating them with microalgae into usable fuel products. This recovery process prevents the fines from becoming waste and eliminates the need for hazardous storage, directly addressing both economic and environmental concerns.
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 upgrades the quality of both water and carbonaceous fines by creating stable agglomerates that can be used as fuel, reduces environmental hazards, and enhances energy generation through improved hydrogen-to-carbon ratios in synthesis gas production.
Implementation Method 1
contacting carbonaceous fines with the water under conditions that permit adsorption of micro-algae onto particles of carbonaceous fines
Data Source
Figure 1
AI summary
A method is provided for the treatment of water containing micro-algae wherein the water is contacted with carbonaceous fines to adsorb micro- algae onto particles of the carbonaceous fines. The carbonaceous fines may be coal or charcoal fines or mixtures thereof. The carbonaceous fines may be pre-treated to remove any unsuitable or valuable materials therefrom; or to produce suitable size ranges of particles for one or more purposes selected from facilitating adsorption; handling of the carbonaceous fines both before and after adsorption of the micro-algae; and separation of the carbonaceous fines with adsorbed micro-algae thereon. The method may target the beneficiation of carbonaceous fines and the carbonaceous fines together with the adsorbed microalgae thereon may be subjected to an agglomeration process for the production of agglomerates such as briquettes or pellets. The method may target the upgrading of a polluted water system in a commercial water treatment process.