Evaporative Concentrator for Leachate Volume Reduction
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Solution Overview
Problem
Current methods for disposing of landfill leachate are inefficient in reducing volume, leading to high disposal costs, and there is a need for a cost-effective method to concentrate this liquid waste using available waste heat from landfill gas combustion.
Innovation Solution
An evaporative concentrator system that utilizes waste heat from landfill gas combustion to reduce the volume of leachate through a multi-stage cyclonic separation process, incorporating a mixing cavity, venturi, and recycle line, achieving significant volume reduction of the leachate by vaporizing and separating the liquid waste stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional leachate disposal methods are used, then disposal is straightforward, but volume reduction is insufficient leading to high disposal costs
Solution Approach 1:
The patent applies phase transition by evaporating water from liquid leachate to convert it from liquid to vapor phase, achieving volume reduction. The evaporative concentrator uses heat to transform the liquid waste stream into concentrated residue and water vapor, directly addressing the volume reduction need.
Solution Approach 2:
The system changes physical parameters by controlling temperature and residence time in the evaporative concentrator. By adjusting these parameters, the system achieves optimal concentration levels and volume reduction while managing the disposal of concentrated leachate.
2Loss of energy
If waste heat from landfill gas combustion is utilized, then energy efficiency improves, but system complexity increases
Solution Approach 1:
The patent merges two separate systems: the landfill gas combustion system and the leachate treatment system. By combining these systems so that waste heat from combustion directly feeds the evaporative concentrator, the patent achieves energy recovery while integrating functions into a unified process flow.
Solution Approach 2:
The evaporative concentrator acts as an intermediary device that receives waste heat from the combustion system and transfers it to the leachate for evaporation. This intermediary component enables efficient heat transfer and energy utilization while managing the interface between thermal processing and waste treatment.
3Quantity of substance
If evaporation is used to concentrate leachate, then volume reduction increases, but energy consumption increases
Solution Approach 1:
The patent converts harmful waste heat from landfill gas combustion into a beneficial resource for driving leachate evaporation. By utilizing this previously wasted thermal energy, the system achieves volume reduction without additional energy input, transforming a waste stream into a useful heating source.
Solution Approach 2:
The system achieves self-service by using its own waste heat output from combustion to power the evaporation process. The landfill gas combustion system inherently produces heat that is directly applied to concentrate leachate, creating a self-sustaining thermal cycle that minimizes external energy requirements.
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 system effectively reduces the leachate volume by up to 80% while utilizing waste heat, thereby decreasing disposal costs and enabling efficient energy recovery from landfill gases.
Implementation Method 1
The venturi fluidizes the liquid waste stream
Implementation Method 2
passing a fluidized gas liquid mixture from the mixing cavity to the first cyclonic separation chamber
Implementation Method 3
multi-stage cyclonic separation process
Implementation Method 4
utilizes waste heat from landfill gas combustion to reduce the volume of leachate through a multi-stage cyclonic separation process
Implementation Method 5
waste heat from the exhaust gas from that combustion is used as a feed to the concentrator
Data Source
AI summary
Disclosed herein are methods of concentrating liquid waste streams including methods comprising drawing a fluidized gas liquid mixture containing water from a mixing cavity into a multi-stage cyclonic separator comprising a first cyclonic separation chamber and a second cyclonic separation chamber in fluid communication with the first cyclonic separation chamber; draining a liquid discharge from the cyclonic separator into a liquid sump; and supplying a liquid contained in the sump to the mixing cavity. Related methods comprise steps such as supplying a liquid waste feed to a concentrator having a mixing cavity and a first cyclonic separation chamber and feeding a supply gas to the mixing cavity. Evaporative concentrators configured to practice these methods are also disclosed.