Device and method for restoring phenanthrene contaminated soil by using two-way approaching method in combined with solubilizer

Abstract

The invention discloses a device and method for restoring phenanthrene contaminated soil by using a two-way approaching method in combined with a solubilizer, belonging to the technical field of phenanthrene contaminated environmental restoration. The whole device is in a sealed state in the restoring process, and mainly comprises a power supply, electrode chambers, electrodes, switches and a horizontal sectional guide porous pipe, wherein four same electrodes are evenly distributed in the contaminated region; each electrode is arranged in the corresponding electrode chamber; and the service conditions of each electrode and the corresponding electrode chamber are controlled through the switches and control systems. According to the restoring method of the device, pollutants continuously approach to the cathode of the middle region by adopting the two-way approaching method, and the pollutant, namely phenanthrene in the soil is enriched nearby the specific cathode region by combining with the solubilization effect of the solubilizer, so that phenanthrene can effectively migrate from the contaminated region.

Description

technical field [0001] The invention belongs to the technical field of remediation of phenanthrene-polluted environment, and in particular relates to a device and method for remediating phenanthrene-contaminated soil by a two-way clamping method combined with a solubilizing agent. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent and refractory hydrophobic organic pollutants that widely exist in the natural environment. At present, the detection rate of polycyclic aromatic hydrocarbon pollutants in my country's soil is very high, and some even reach high concentrations, and their total mass fraction can reach tens to tens of thousands of μg / kg. The polycyclic aromatic hydrocarbons present in the environment pose a potential threat to the ecological environment, the safety of agricultural products and human health. Phenanthrene is a typical polycyclic aromatic hydrocarbon (PAHs) substance, which belongs to the target pollutant of...

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Problems solved by technology

Microbial remediation often requires the introduction of exogenous microorganisms into the soil. These introduced obligate degrading bacteria or genetically engineered bacteria are easily affected by the competition of indigenous microorganisms, resulting in a decline in the restoration effect, and the introduction of exogenous bacteria also has potential soil ecological risks.

Phytoremediation mainly relies on direct absorption and accumulation to repair polycyclic aromatic hydrocarbons. However, at present, the absorption and accumulation of phenanthrene by plants is very unclear, and the relative contribution rate of plant absorption and accumulation and indigenous microbial degradation of phenanthrene in soil cannot be clarified.

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