Purification of coking-plant effluent

Journal Article · Sat Jan 01 04:00:00 EST 1977 · Coke Chem., USSR (Engl. Transl.); (United States)

OSTI ID:6030366

Biryukova, V Ya; Il'in, Yu N

The purification of coking-plant effluent is a most complicated technical problem, which if correctly solved can make a large proportion of the effluent fit for recycling. Since water supplies in the Donbas are limited, the matter is extremely important. The composition of the effluent reaching the biochemical plant at the Avdeevka Coke and Chemical Works is recorded in a table. Before removing phenols from the phenolic effluent, tar and oils are removed in primary clarifiers and oil separators with AM-350 aerators. Although a long clarification period is allowed (10 hr or more) and oil separators are used, the extent to which tar and oils are removed from the effluent is inadequate. Particular difficulties are experienced with effluents rich in benzene and naphthalene as well as oils, and also with effluents from the oil storage tanks in the coal tar processing shop. The use of ferrous sulfate to enhance the removal of tar and oils from the effluent was introduced in 1975. The additive is introduced before the effluent enters the primary clarifiers, at the rate of 20 to 50 g FeSO/sub 4/ per m/sup 3/ of effluent. It is noteworthy that in the presence of appreciable amounts of H/sub 2/S the action of this coagulant additive differs significantly from that of ferric or ferrous hydroxide. The use of ferrous sulfate significantly enhances the removal of oils from effluents; seriously oil-polluted effluents can be processed without risk to the aeration tank performance. Residual H/sub 2/S is oxidized in the oil separators, thereby improving the conditions for final biological purification.

• OSTI ID: 6030366
• Journal Information: Coke Chem., USSR (Engl. Transl.); (United States), Journal Name: Coke Chem., USSR (Engl. Transl.); (United States) Vol. 8; ISSN COKCA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010401* -- Coal & Coal Products-- Carbonization-- (-1987)
BIODEGRADATION
CHALCOGENIDES
CHEMICAL EFFLUENTS
CHEMICAL REACTIONS
COAL TAR
COKING PLANTS
DECOMPOSITION
EUROPE
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INDUSTRIAL PLANTS
IRON COMPOUNDS
IRON SULFATES
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PURIFICATION
RECYCLING
REMOVAL
SULFATES
SULFIDES
SULFUR COMPOUNDS
TAR
TRANSITION ELEMENT COMPOUNDS
USSR