To contribute to the prevention of the so-called environmental pollution at the time of insolubilization treatment of a harmful substance contained in back-filling polluted soil.

The supply part conveyor in the supply means S arranged on a base stand B to receive polluted soil, the treatment part conveyor 4 in the treatment means D arranged on the base stand B in the same way to subject the polluted soil from the supply means S to insolubilization treatment and a grinding mechanism 5 are set to an electromotive type using the dynamo G, which is arranged on the base stand B, as a power supply.