Fluid purification system

A fluid purification system, comprising:

• a reaction tank which purifies a purification target fluid by decomposing an organic substance in a purification target fluid with an oxidation reaction while heating and pressurizing a mixed fluid of the purification target fluid and an oxidant;
• a crusher which crushes an organic solid waste so as to obtain an organic crushed product;
• a mixer which mixes the organic crushed product and liquid so as to obtain high concentration organic slurry;
• and
• a mixing pump which mixes the purification target fluid with the high concentration organic slurry, so as to be pumped to the reaction tank.