Patent ID: 7892426
Filing Date: 2011-02-22
Classification: C02F,Y10S

Abstract:
1. A wastewater treatment apparatus for treating wastewater with a reduced wastewater purification material comprising: a first addition tank in which a ferrous iron compound is added to wastewater; a sealed reaction tank having a non-oxidizing atmosphere for allowing the wastewater from said first addition tank to which the ferrous iron compound is added to react at a pH of 8.5 to 11, thereby forming a slurry containing a mixture of green rust and iron ferrite (Fe a solid-liquid separation means for subjecting a slurry which is extracted from the reaction tank to a solid-liquid separation to obtain a sludge; a second tank in which an alkaline compound is added to the separated sludge to alkalinize all or the portion of the separated sludge to adjust a pH of the sludge to 11 to 13, thereby forming an alkaline sludge; a line through which the alkaline sludge is returned to the reaction tank; and lines which connect each of the tanks and the solid-liquid separation means, arranged to form the slurry in the sealed reaction tank so that the ratio of divalent ions in the slurry (Fe