Abstract: A combined remediation method of petroleum-contaminated soil includes: impurity removal pretreatment, photocatalytic pre-oxidation, stepwise thermal desorption of petroleum from soil, and high-temperature oxidation; with iron-titanium composite metal oxide (ITCMO) as a catalyst, conducting oxidation pretreatment under light conditions so that some cross-linked structures in macromolecular petroleum contaminants are broken and degraded; and conducting stepwise pyrolysis to achieve a removal rate of more than 98.00%. The new method adopts a combined remediation technology of photocatalytic pre-oxidation-stepwise pyrolysis, which realizes a relatively-high removal rate of petroleum hydrocarbons and the efficient and harmless remediation of high-concentration petroleum-contaminated soil, and remedied soil can be reused.

Abstract: A combined remediation method of petroleum-contaminated soil includes: impurity removal pretreatment, photocatalytic pre-oxidation, stepwise thermal desorption of petroleum from soil, and high-temperature oxidation; with iron-titanium composite metal oxide (ITCMO) as a catalyst, conducting oxidation pretreatment under light conditions so that some cross-linked structures in macromolecular petroleum contaminants are broken and degraded; and conducting stepwise pyrolysis to achieve a removal rate of more than 98.00%. The new method adopts a combined remediation technology of photocatalytic pre-oxidation-stepwise pyrolysis, which realizes a relatively-high removal rate of petroleum hydrocarbons and the efficient and harmless remediation of high-concentration petroleum-contaminated soil, and remedied soil can be reused.

Abstract: Presented is an electric field intensity compensation method for constructing a non-uniform electric field through an auxiliary electrode, including steps of: in a matrix electrode unit, designing an auxiliary electrode arrangement position according to the spatial distribution of the pollutant concentration; designing the polarity of the auxiliary electrode according to the position relationship between the auxiliary electrode and matrix electrodes; and constructing a non-uniform electric field by the auxiliary electrode and the matrix electrodes to implement space compensation of the electric field intensity.

Abstract: The present invention relates to an electric field intensity compensation method for constructing a non-uniform electric field through an auxiliary electrode, comprising the following steps: in a matrix electrode unit, designing auxiliary electrode arrangement position according to the spatial distribution of the pollutant concentration; designing the polarity of the auxiliary electrode according to the position relationship between the auxiliary electrode and matrix electrodes; and constructing a non-uniform electric field by the auxiliary electrode and the matrix electrodes to implement space compensation of the electric field intensity, In the present invention, a non-uniform electric field matching a pollutant concentration field is constructed by setting the space arrangement and polarity of the auxiliary electrodes on the basis of the matrix electrodes according to the spatial distribution of the pollutant concentration, the contradiction of consistency between the heterogeneity of the spatial distribut