초록 ▼

A reducing water purification material having a reducing iron-based precipitate selected from green rust, iron ferrite, reducing iron hydroxide, and a mixture thereof. A wastewater treatment process having steps of adding a reducing iron compound to wastewater, leading the wastewater to which the re

A reducing water purification material having a reducing iron-based precipitate selected from green rust, iron ferrite, reducing iron hydroxide, and a mixture thereof. A wastewater treatment process having steps of adding a reducing iron compound to wastewater, leading the wastewater to which the reducing iron compound is added to a reaction tank and forming a precipitate, separating the formed precipitate by a solid-liquid separation to obtain a sludge, and alkalinizing all or a portion of the separated sludge to form an alkaline sludge followed by returning to the reaction tank, wherein in the precipitation step, the wastewater to which the reducing iron compound is added and the alkaline sludge are mixed and are allowed to react in a non-oxidizing atmosphere under alkaline condition to form a reducing iron compound precipitate as the precipitate, thereby incorporating contaminants in the precipitate to remove the contaminants from the wastewater.

대표청구항 ▼

The invention claimed is: 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 was

The invention claimed is: 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 (Fe2+/Fe(T)) said slurry being included in the reduced wastewater purification material;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 (Fe2+/Fe(T)) is 0.4 to 0.8, and the ORP of the slurry in the reduced wastewater purification material is −500 mV to −800 mV versus Ag/AgCl electrode.