Thermal Hydrolysis Segmentation for Viscosity Reduction
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Solution Overview
Problem
Current wastewater treatment methods face challenges in achieving optimal digestion rates, pasteurization, and viscosity reduction, particularly in managing multiple waste streams with varying temperatures and pressures, which limits the efficiency of processes like thermal hydrolysis and pasteurization.
Innovation Solution
Implementing a system that uses separate waste streams for thermal hydrolysis or carbonization and pasteurization processes, either in parallel or series, with heat exchangers to optimize temperature and pressure conditions for each stream, allowing for co-mixing and achieving high digestion rates, pasteurization, and viscosity reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal hydrolysis is performed at high temperatures and pressures to reduce viscosity and improve digestion rates, then digestion rates and viscosity reduction are improved, but the requirement for high-pressure vessels increases
Solution Approach 1:
The waste stream is divided into two separate streams: one undergoes thermal hydrolysis at high temperature and pressure to achieve viscosity reduction and digestion rate improvement, while the other undergoes pasteurization at lower temperature and atmospheric pressure. This segmentation allows each stream to be treated according to its specific requirements, reducing the overall need for high-pressure vessels while maintaining high digestion rates through the combined treatment of both streams
Solution Approach 2:
The effluents from the thermal hydrolysis process and the pasteurization process are combined in a common anaerobic digester. This merging allows the system to achieve the benefits of both high-temperature treatment (viscosity reduction, improved digestion rates) and low-temperature treatment (pasteurization, reduced pressure requirements) while sharing the digester infrastructure, thereby reducing the overall requirement for high-pressure vessels
2Temperature
If thermal hydrolysis is performed at high temperatures to achieve viscosity reduction, then viscosity reduction is improved, but energy consumption increases
Solution Approach 1:
The waste stream is segmented into two paths: one for thermal hydrolysis at high temperature (100-200°C) to achieve viscosity reduction, and another for pasteurization at lower temperature (60-100°C). By treating different portions of the waste stream at different temperature levels, the system achieves the necessary viscosity reduction for effective digestion while avoiding the energy penalty of heating the entire waste stream to high temperatures
Solution Approach 2:
The system changes the temperature parameter differently for different waste streams: one stream is heated to high temperature (100-200°C) for thermal hydrolysis and viscosity reduction, while the other is heated to lower temperature (60-100°C) for pasteurization. This parameter differentiation allows the system to achieve viscosity reduction where necessary while minimizing overall energy consumption
3Device complexity
If pasteurization is performed at atmospheric pressure to reduce equipment complexity, then device complexity is reduced, but pasteurization efficiency decreases
Solution Approach 1:
The waste stream is segmented such that one portion undergoes thermal hydrolysis at high temperature and pressure to achieve viscosity reduction and digestion rate improvement, while another portion undergoes pasteurization at atmospheric pressure. The thermal hydrolysis stream compensates for the lower pasteurization efficiency by providing enhanced digestion rates and viscosity reduction, ensuring overall system reliability and effective waste treatment
Solution Approach 2:
The effluents from both thermal hydrolysis and pasteurization processes are merged in a common anaerobic digester. This merging allows the system to achieve reliable waste treatment by combining the benefits of high-temperature thermal hydrolysis (viscosity reduction, improved digestion rates) with atmospheric pressure pasteurization (simplified equipment), ensuring that the combined treatment achieves effective pasteurization and digestion reliability
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 enhances digestion rates, pasteurization efficiency, and viscosity reduction, minimizing the need for high-pressure vessels and achieving high dewatered cake solids concentrations, while allowing for flexible management of waste streams and heat transfer.
Implementation Method 1
with heat exchangers to optimize temperature and pressure conditions for each stream
Implementation Method 2
thermal hydrolysis is now becoming a widely practiced technology to improve digestion rates (usually at temperatures greater than 100 degrees Celsius)
Implementation Method 3
Thermal Carbonization is the practice of heating sludge to temperatures (at different retention times) approximately greater than 180° C. under pressure and up to approximately 220° C.
Data Source
AI summary
This invention proposes the use of Thermal Hydrolysis (or Thermal Carbonization) at different temperatures and pressures in alternate waste streams to achieve an optimal mix of high digestion rates and pasteurization rates while still achieving large viscosity reduction. In the disclosed embodiments means of combining Thermal Hydrolysis (or Thermal Carbonization) and Pasteurization including but not limited to placing the waste streams in parallel, placing them in series, utilizing heat input in parallel and heat exchangers in series are explored to optimize hydrolysis rates, minimize the use of high pressure tanks, optimize energy used, and manage viscosity characteristics of the solids.