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Method for treatment of a discharge liquid produced in treatment of an exhaust gas

Patent ·
OSTI ID:5961871
;

A process is described fortreating an exhaust gas discharged from a coal combustion apparatus. The exhaust gas is first led to a dry type dust collecting device, and after fly ash in said exhaust gas is removed, said exhaust gas is treated by a wet type exhaust gas cleaning device; a part of said fly ash collected in said dry type dust collecting device is added to a discharge liquid or a discharge sludge discharged from said wet type exhaust gas cleaning device. The amount of the fly ash to be added to the discharge sludge should be at least three times (In weight) as much as the amount of water contained in said discharge sludge. Preferably fly ash of approximately the same weight as that of said discharge sludge should be added to the discharge sludge discharged from said wet type exhaust gas cleaning device, and subsequently calcium hydroxide of about onetenth in weight of said discharge sludge should be added to the mixture for solidifying said discharge sludge. In a preferred embodiment, the mixture of the discharge liquid and the fly ash is led to a solid-liquid separator to separate the mixture into clear water and sludge, and the clear water is returned to said wet type exhaust gas cleaning device, while the separated sludge is mixed with additional fly ash to further eliminate a discharge water.

Assignee:
Mitsubishi Jukogyo K K (Japan)
Patent Number(s):
US 4297332
OSTI ID:
5961871
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
AEROSOL WASTES
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
ASHES
BOILERS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM SULFATES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
CONTROL
DESULFURIZATION
DUST COLLECTORS
ENERGY SOURCES
EQUIPMENT
EXHAUST GASES
FLUIDS
FLY ASH
FOSSIL FUELS
FUELS
GASEOUS WASTES
GASES
GYPSUM
HYDROGEN COMPOUNDS
HYDROXIDES
LIQUID WASTES
MANAGEMENT
MATERIALS
MINERALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PROCESSING
RECYCLING
REMOVAL
RESIDUES
SEPARATION PROCESSES
SLUDGES
SOLIDIFICATION
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES