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The wonderful journey of low-temperature thermal desorption: How to effectively remove petroleum pollutants from soil?
As environmental issues receive increasing attention, soil pollution remediation technologies are also evolving. As an innovative environmental protection technology, low temperature thermal desorption (LTTD) has received widespread attention. This technology uses thermal energy to physically separate petroleum hydrocarbon pollutants in the soil, becoming an effective way to address soil pollution.
What is low temperature thermal desorption?
Low-temperature thermal desorption technology, also known as low-temperature thermal volatilization technology, thermal stripping or soil baking, is mainly used for excavated contaminated soil. By heating the soil, the volatilization and separation of pollutants are promoted, thereby achieving soil cleaning.
The thermal desorption device is designed to heat the soil to a sufficient temperature to volatilize and desorb its organic components. Even though these devices are not specifically designed to decompose organic components, they can partially or completely decompose some organic components depending on the specific environment and temperature.
Effectiveness of low temperature thermal desorption
LTTD has been shown to effectively reduce the concentration of a wide range of petroleum products, including gasoline, jet fuel, kerosene, diesel, heating oil and lubricating oils. Generally, LTTD is applicable to components that volatilize at temperatures up to 1,200 °F, while most equipment operates in the temperature range of 300 °F to 1,000 °F.
How the technology works
LTTD system operations are generally divided into two categories: fixed facilities and mobile units. Once the contaminated soil has been excavated, it can be transported to a fixed facility or operated directly on site by a mobile unit. Such a system is not only highly efficient, but can also carry out specific pre-treatment measures for different soil types to suit different remediation needs.
Operating LTTD units requires various permits and must be monitored in accordance with permit requirements, which is critical for environmental protection and soil remediation work.
Challenges during operation
In actual operation, the intervening moisture, soil plasticity and other components will affect the efficiency of thermal desorption. Excessive humidity will increase the heat required, affecting the speed and effectiveness of repair. In addition, the presence of heavy metals can also affect solid waste disposal and violate air pollution control regulations.
Diversity of system design
Among the numerous LTTD systems, different designs such as rotary dryers, hot spirals, and conveyor ovens all have their own unique advantages and disadvantages. The selection of an appropriate system requires a decision based on the nature of the pollutants as well as economic considerations.
Each LTTD system has different solids handling capabilities, heat transfer characteristics, and maintenance requirements, and the specific application needs to consider the type of soil contaminants and the historical record of system performance.
Future Outlook
With the development of technology and the reduction of costs, LTTD technology is expected to be widely used in more soil remediation projects. This not only removes pollution efficiently, but also helps restore the environmental ecology and provides solutions for future sustainable development.
As we pay more attention to environmental protection, can we develop more efficient and economical soil remediation technology in the future?
