Biological barrier system and method for blocking migration path of benzene series in site to atmosphere

Abstract

The invention relates to the technical field of risk management and control of contaminated sites, and discloses a biological barrier system and method for blocking a migration path of benzene seriesin a site to the atmosphere. The system covers a polluted area and sequentially comprises an aeration layer and a barrier layer from bottom to top, and the barrier layer is clean soil with biologicalactivity; the aeration layer comprises a filter material layer laid above the polluted area and an aeration pipe buried in the filter material layer; the soil gas monitoring system comprises a layeredmonitoring gas well and a soil gas collecting device; the soil gas collection device comprises a gas guide device buried in a layered monitoring gas well, wherein the air guide devices are communicated with an air inlet of the air extractor on the ground through guide pipes, the air guide devices are arranged at intervals in the depth direction of the layered monitoring gas well and buried in theair guide material layer, isolation layers are laid on the upper side and the lower side of the air guide material layer respectively, and the space between the isolation layers of the vertically adjacent air guide devices is filled with a connecting layer. The system is low in cost, capable of achieving in-situ blocking, free of secondary pollution, economical, environmentally friendly and goodin blocking effect.

Description

technical field [0001] The invention relates to the technical field of risk management and control of polluted sites, in particular to a bio-barrier system and method for blocking the migration pathway of benzene series substances in the site to the atmosphere. [0002] technical background [0003] Benzene series with strong volatility are commonly detected in the soil and groundwater of industrially polluted sites with high frequency. Such pollutants can enter the surface air through a series of migration and transformation, and cause harm to human health after inhalation through breathing. [0004] At present, the domestic risk management and control of such contaminated sites is mainly based on restoration. By adopting a series of high-energy, high-disturbance engineering restoration measures, the benzene series is removed from the soil and groundwater to eliminate its possible risks to human health. However, during the implementation of these engineering restoration mea...

AI Technical Summary

Problems solved by technology

However, during the implementation of these engineering restoration measures, benzene series are highly volatile and easily escape into the surrounding atmosphere, causing secondary pollution

At the same time, the odor problem during the implementation process can easily cause protests from the surrounding masses, and eventually lead to mass gatherings

In addition, due to the adsorption of pollutants by soil organic matter, the "tailing" phenomenon is prone to occur during the restoration process, which prolongs the period of the restoration project, and the restoration effect has a certain degree of uncertainty, which ultimately affects the redevelopment and utilization of the site

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