Research On Evaluation Method Of Volatile Odor Pollutant Identification And Release Ability Of Contaminated Site Of Pesticide Enterprise

In recent years,with the planning and development of cities in my country,more and more industrial enterprises have moved away from cities,and the number of contaminated sites left behind is also increasing.The problem of volatile odor pollution in contaminated sites has caused concerns from all walks of life.Widespread concern,such as the "Changzhou Poisonous Land" and "Primary and Elementary School Poison Sports Ground" that have a greater social impact,have exposed relatively serious odor pollution.In addition,during the site restoration process,the surrounding residents often complained due to the escape of malodorous pollutants.After the contaminated site is rehabilitated,the content and impact of odorous substances cannot be ignored.The level of its concentration will directly affect the public’s judgment on the remediation effect.This research focuses on key issues that urgently need to be solved in the control of odor pollution in three pesticide companies’ contaminated sites,and combines long-term accumulated scientific research and engineering practice experience to carry out the evaluation of the identification and release of volatile odor pollutants in pesticide companies’ contaminated sites Methodological research,ascertaining the volatile malodorous pollutants and malodorous pollutants in the contaminated sites of three pesticide companies,monitoring the flux of volatile malodorous pollutants and evaluating their release capabilities.The specific content of this article is as follows:Identified the characteristic volatile odor pollutants and the components of volatile odor pollutants in the contaminated sites of pesticide companies in three different regions.Through on-site sampling and laboratory instrumental analysis techniques,218 volatile odor pollutants were detected,mainly including alkanes,benzene series,halogenated hydrocarbons,and esters,and 18 characteristic volatile odor pollutants were screened out.1.The characteristic volatile odor pollutants and the components of volatile odor pollutants in the contaminated sites of three pesticide companies were identified.Through on-site sampling and laboratory instrumental analysis technology,218 volatile odor pollutants were detected,mainly including alkanes,benzene series,halogenated hydrocarbons,and esters,and 18 characteristic volatile odor pollutants were screened out.2.Through the on-site operation of the static box and the dynamic box,it is found that both can effectively measure the emission flux of volatile odor pollutants on the pesticide enterprise site.By comparing the measured emission flux values of the two,it can be seen that this The two methods have a good degree of discrimination.The static box was used to monitor the unrepaired contaminated soil and the repaired soil in the greenhouse.By comparing the release flux,it was found that the release flux of the repaired soil was significantly less than that of the unrepaired(greenhouse),indicating that the site has a certain degree of soil remediation effect.3.The combined results of the static box method and the dynamic box method show that the presence or absence of fans has a certain degree of influence on the release of volatile odor pollutants in the soil;when the number of fans increases,the flux of odor emission decreases,which may be Under the mutual purging action of the fans,there is no direct disturbance to the contaminated soil surface;when the wind speed of the fan increases,the release rate of malodorous substances in the early stage also increases correspondingly,and the opposite is the case in the later stage;when the setting position of the fan is changed,The foul odor release flux has little effect.