Abstract:

Abundant, economic and ecosafe scoria was used to decontaminate groundwater contaminated by petroleum. This essay shows the response
relationship between its decontamination process and hydrochemistry factors. The main investigation hydrochemical factors included Fe²⁺,Fe³⁺,Mn²⁺,SO^2-₄,NH⁺₄,Ca²⁺,Mg²⁺,NO^-₃,NO^-₂ and so on. The results show that scoria adsorb petroleum hydrocarbons （total petroleum hydrocarbon, TPH） in the water: it is not affected by Mn²⁺,SO^2-₄,Ca²⁺,NH⁺₄, but affected by Fe²⁺,Fe³⁺,Mg²⁺,NO^-₂,NO^-₃. The Fe²⁺,Fe³⁺,Mg^2+ and NO^-₂ have the inhibition effect on the adsorption of the scoria for TPH, while NO^-₃ has the promotion effect on the adsorption of the scoria for TPH. In the purification process of scoria for TPH, it can simultaneously remove all the ions. The removal rate of Ca²⁺ is between 42% to 56%, those of SO^2-₄,Mg²⁺,NH⁺₄ are between 60% to 80%, while those of Fe²⁺,NO^-₃ are greater than 80%, and Fe³⁺,Mn²⁺,NO^-₂ are almost completely removed and the removed rates are more than 95%.

Key words: underground water, scoria, total petroleum hydrocarbon (TPH), chemical factor, change law