Hydrothermal Carbonization for Decontaminating Chlorinated Pollutants
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Solution Overview
Problem
Hydrothermal carbonization processes fail to effectively degrade persistent chlorinated organic pollutants, such as dioxins and PCBs, often resulting in increased dioxin levels and limited agricultural use of the treated products due to the non-oxidative conditions and lack of sufficient degradation of organochlorine compounds in fly ash.
Innovation Solution
A method involving treating contaminated materials under reducing conditions using 1-50% biomass and 50-90% water at temperatures above 300°C and pressures above 90 bar for over 1 hour in a sealed, oxygen-free environment, with external heat addition to achieve significant pollutant breakdown, and a plant designed to facilitate this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hydrothermal carbonization is performed under closed hermetic conditions at around 200°C, then the process is simple and efficient, but the dioxin content increases and the product has limited agricultural use
Solution Approach 1:
The patent changes the temperature parameter from around 200°C to above 300°C (preferably 300-400°C) and increases pressure to above 90 bar (preferably 90-250 bar). These parameter changes enable the system to achieve effective degradation of organochlorine compounds while maintaining the hermetic closed conditions, thus resolving the contradiction between process simplicity and dioxin content control
Solution Approach 2:
The patent uses a composite system containing biomass (1-50% by weight) combined with contaminated material (1-50% by weight) and water (50-90% by weight) in a hermetic reactor. This composite composition enables effective degradation of contaminants through hydrothermal carbonization at elevated temperatures and pressures, transforming the simple hydrothermal process into an effective decontamination system
2Productivity
If hydrothermal carbonization is performed at around 200°C for a few hours, then the process is efficient, but the organochlorine compounds in fly ash are not degraded
Solution Approach 1:
The patent extends the treatment time to more than 1 hour (preferably more than 5 hours) and increases temperature to above 300°C (preferably 300-400°C) and pressure to above 90 bar (preferably 90-250 bar). These parameter changes enable complete degradation of organochlorine compounds while maintaining efficient processing, resolving the contradiction between productivity and reliability
Solution Approach 2:
The patent implements continuous treatment for more than 1 hour (preferably more than 5 hours) under sustained high temperature and pressure conditions. This continuous application of energy and chemical transformation ensures complete degradation of organochlorine compounds, transforming a short-term process into a reliable decontamination system
3Reliability
If the process is carried out under reducing conditions with biomass and water at high temperature and pressure, then pollutant breakdown is achieved, but the system requires external heat addition and complex equipment
Solution Approach 1:
The patent utilizes the exothermic reactions of hydrothermal carbonization to generate heat within the system itself. The biomass and water mixture undergoes spontaneous chemical reactions that produce sufficient heat to maintain the required temperature above 300°C and pressure above 90 bar, reducing or eliminating the need for external heat addition devices while ensuring reliable pollutant breakdown
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 achieves a >99% reduction in dioxins, PCBs, and PAHs, making the treated materials suitable for broader agricultural use by effectively degrading contaminants.
Implementation Method 1
The process of hydrothermal carbonization is a simple and efficient chemical process to produce products from exothermic reactions. At a temperature of around 200°C and a pressure of between 20 and 30 bar, hydrothermal carbonisation reproduces the natural coal formation process.
Implementation Method 2
The process of hydrothermal carbonization is a simple and efficient chemical process to produce products from exothermic reactions.
Implementation Method 3
Treatment of the mass at a temperature above 300° C., preferably from 300° C. to 400° C. and at a pressure above 90 bar, preferably from 90 to 250 bar
Implementation Method 4
at a pressure above 90 bar, preferably from 90 to 250 bar
Implementation Method 5
The aim of the present invention is a method that causes decontamination of the contaminated parts not under oxidative but under reducing conditions
Data Source
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AI summary
A method for breaking down pollutants in a mass which consists of the material to be decontaminated, organic carbon and water. According to the invention, the method comprises the following steps: treatment of the mass at a temperature above 300°C, a pressure above 90 bar and for a treatment duration longer than one hour, in a hermetically sealed space under the exclusion of oxygen.