Countercurrent Activated Carbon Recycling for TFT-LCD Waste Liquid
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Solution Overview
Problem
In TFT-LCD organic waste liquid treatment, the saturation of activated carbon in adsorption processes leads to low production efficiency and requires manual replacement, posing risks due to toxic substances.
Innovation Solution
A countercurrent system and method that allows for non-disassembly replacement of activated carbon particles, using a pipeline device with concentration monitoring to control the injection and recycling of activated carbon, enabling continuous treatment and recovery of organic solvents through solid-liquid separation and degassing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon particles are concentrated into filter bags or filter tubes for adsorption, then adsorption efficiency is improved, but manual replacement is required when saturated which reduces production efficiency and creates safety risks
Solution Approach 1:
The system enables automated regeneration of activated carbon through a fluidized bed reactor that continuously circulates and regenerates carbon particles using steam, eliminating the need for manual replacement and maintaining continuous operation
Solution Approach 2:
The system maintains continuous adsorption operation by implementing a regenerative cycle where saturated carbon is automatically regenerated and returned to the adsorption column, ensuring uninterrupted treatment process
2Reliability
If manual replacement of saturated activated carbon is performed, then adsorption capacity is maintained, but human intervention is required which reduces efficiency and exposes workers to toxic substances
Solution Approach 1:
The automated regeneration system performs all carbon replacement operations automatically through the fluidized bed reactor, which circulates, regenerates, and returns carbon particles without human intervention, eliminating exposure to toxic substances
Solution Approach 2:
The system replaces manual mechanical replacement operations with an automated fluidized bed regeneration system that uses fluid dynamics and automated control to perform carbon regeneration and replacement
3Quantity of substance
If activated carbon is used for adsorption of organic solvents, then organic solvent recovery value is improved, but saturated carbon requires treatment which increases process complexity
Solution Approach 1:
The system combines the adsorption column and fluidized bed reactor into an integrated regenerative system where carbon circulation and regeneration are merged into a single continuous process, reducing overall system complexity
Solution Approach 2:
The system recovers and regenerates saturated activated carbon through the fluidized bed reactor, converting waste carbon back into functional adsorbent material and returning it to the adsorption process
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 continuous recycling of high-purity organic solvents and activated carbon, reducing manual intervention and the risks associated with handling saturated activated carbon.
Implementation Method 1
adsorption is a common treatment method, and activated carbon particles are commonly used as adsorbents
Implementation Method 2
the saturated activated carbon is gradually subjected to solid-liquid and degassed by heating
Implementation Method 3
the saturated organic solvent is separated and recovered
Data Source
AI summary
A system and method for regulating and absorbing TFT-LCD organic solvent waste liquid in countercurrent are provided. In the system, each of longitudinal offset pipes of absorbing pipes is disposed between a lower filter plate and an upper filter plate, bottom positions of the longitudinal offset pipes are connected with a sinking-recovery pipe, each longitudinal offset pipe is provided with a photoelectric detector, an activated carbon supply pipe is provided with an activated carbon supply device, the sinking-recovery pipe is connected with a solid-liquid separator, and a wet activated carbon conduction mechanism is provided with a heating-separating device. Activated carbon particles in the absorbing pipe with a certain saturation amount are led out in a non-disassembly-replacement method, the saturated activated carbon is subjected to solid-liquid separating and heating degassing, thus the saturated organic solvent is separated and recovered and the activated carbon particles are recycled.