METHOD AND APPARATUS FOR TREATING WASTE WATER CONTAINING CALCIUM AND SULFURIC ACID

PROBLEM TO BE SOLVED: To reduce a running cost when waste water containing calcium and sulfuric acid is concentrated by boiling and evaporating by indirect heating. SOLUTION: In a reactor 1, sodium carbonate is added to the waste water, calcium included in the waste water is deposited as a crystal o...

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Hauptverfasser:	ISHIDA KAZUHIKO, KAMINARI TORU, MAEKAWA KAZUTO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To reduce a running cost when waste water containing calcium and sulfuric acid is concentrated by boiling and evaporating by indirect heating. SOLUTION: In a reactor 1, sodium carbonate is added to the waste water, calcium included in the waste water is deposited as a crystal of calcium carbonate, and then the waste water in a state of including the crystal of the calcium carbonate is transferred to and concentrated in an evaporation concentration device 6 for boiling and evaporating by indirect heating. COPYRIGHT: (C)2007,JPO&INPIT