Microwave remediation method for polycyclic aromatic hydrocarbon contaminated site

Abstract

The invention discloses a microwave remediation method for a polycyclic aromatic hydrocarbon contaminated site. The method comprises the following steps: air-drying soil contaminated by polycyclic aromatic hydrocarbon and total petroleum hydrocarbon under natural conditions, ensuring that the moisture content of the air-dried soil is 10-25%, screening the air-dried soil, removing big stones and concrete blocks to obtain the to-be-processed soil, mixing certain amount of a microwave absorbent and the to-be-processed soil evenly, putting the to-be-processed soil mixed with the microwave absorbent into a microwave processing device, starting a microwave generator of the microwave processing device, ensuring that the temperature in the microwave processing device reaches a preset temperature, and carrying out microwave processing on the to-be-processed soil for a period of time. The method provided by the application of the invention is simple and easy in operation, short in operation time and high in processing efficiency, is removable, safe and environment-friendly, more importantly, the yield of tail gas in the processing stage is low, the purifying cost is low, and a novel effective method is provided for thermal remediation of the contaminated soil.

Description

technical field [0001] The invention relates to the technical field of treating polycyclic aromatic hydrocarbon organic pollutants in soil in environmental protection, in particular to a microwave restoration method for polycyclic aromatic hydrocarbon contaminated sites. Background technique [0002] Due to the lack of necessary urban planning in history, many industrial enterprises in China are located in the central area of ​​the city. Since the 1990s, China's social and economic development has been rapid, the urbanization process has accelerated, and industrial structure adjustment has deepened, resulting in a shortage of land resources. Many cities have begun to relocate industrial enterprises in the main urban area out of the city, creating a large number of sites with environmental risks. The existence of these polluted sites presents a double problem: environmental and health risks on the one hand, and impediments to urban construction and economic development on the...

AI Technical Summary

Problems solved by technology

The presence of these polluted sites presents a double problem: environmental and health risks on the one hand, and impediments to urban construction and economic development on the other

[0003] Due to the late start of soil remediation technology in my country, the remediation technology and engineering practice experience of contaminated sites are also insufficient, mainly relying on the introduction and reference of foreign advanced technology, but foreign advanced technology cannot fully adapt to the current situation of my country's polluted soil