TREATMENT METHOD FOR MANGANESE-CONTAINING WASTEWATER

Japanese Patent JP3921695

B2

PROBLEM TO BE SOLVED: To stably and efficiently treat manganese-containing wastewater, e.g. flue gas desulfurization wastewater, by making manganese insoluble by adding a permanganate to the manganese-containing wastewater and then insolubilizing the remaining permanganate by adding a sulfur-containing compound and successively separating insoluble substances by solid-liquid separation.
SOLUTION: Manganese-containing wastewater, e.g. flue gas wastewater, is led to an adjustment tank 1, pH of the wastewater is adjusted to be 8.0-9.5 by adding an alkali such as NaOH and, at the same time, air aeration is carried out by an air bubbling pipe 13. Next, the wastewater flowing out of the adjustment tank 1 is led to a first reaction tank 2 and fluorine is converted into an insoluble substance by adding a permanganate, e.g. KMnO4, or an aluminum compound, an alkali, etc., and adjusting pH to about 6.0-7.5. After that, the resultant wastewater flowing out of the first reaction tank 2 is led to a second reaction tank 3 and the permanganate is converted into an insoluble substance by adding a sulfur-containing compound. The obtained wastewater flowing out of the second reaction tank 3 is then led to a membrane separation apparatus 5 through a circulation tank 4 and a pump P and the insoluble substances are separated and removed.

Kazuhiro Ishiyama
Yu Sasaki
Tadashi Takadoi
Kiyohito Chikazawa
Seiichiro Mita
Takeshi Sato

JP18706595A

May 30, 2007

July 24, 1995

Click for automatic bibliography generation  

Tohoku Electric Power Co., Inc.
Kurita Water Industries Ltd.

C02F1/64; (IPC1-7): C02F1/64

JP7108281A
JP52073544A
JP54070643A
JP7068273A
JP55094679A
JP2229593A
JP57117385A

Tsuyoshi Shigeno

Previous Patent: ELECTROLYTIC FLOCCULATOR

Next Patent: ASYMMETRIC EPOXIDIZING REACTION OF CYCLOALKADIENES