Wastewater treatment using ferrous sulfate

Journal Article · Tue Jan 01 04:00:00 EST 1980 · Coke Chem. USSR (Engl. Transl.); (United States)

OSTI ID:5633274

Boetskaya, K P; Ioffe, E M

Treatment of industrial wastewater with coagulants is used extensively in the thorough removal of emulsified tars and oils. The central plant laboratory at the Zhdanov Coke Works conducted investigations of the treatment of wastewater, subsequently used for quenching coke, with ferrous sulfate. Laboratory tests and subsequent industrial tests demonstrated the efficiency of the method. In order to further intensify the wastewater treatment process we conducted laboratory tests with the addition of certain quantities of other coagulation reagents, for example polyacrylamide (PAA) and caustic soda, in addition to the ferrous sulfate. The combined use of polyacrylamide and ferrous sulfate permits instant coagulation of the sludge and very rapid (5 to 10 min) clarification of the water. In addition, in this case the degree of purification of the water is less dependent on the initial concentration of impurities. The purification is also improved when caustic soda is added, raising the pH. From the data it is apparent that an identical degree of purification of the water may be achieved either by increasing the consumption of ferrous sulfate, or by adding PAA or NaOH. During industrial tests of the purification of wastewater with ferrous sulfate, we also investigated the resulting sludge. The use of ferrous sulfate causes a significant increase in its quantity (by a factor of 1.5 to 1.8) and in its oil content (by a factor of 2 to 2.5). The water content in the sludge decreases. The sludge (in the quantity of 0.6% of the charge) may be added to the coking charge.

• OSTI ID: 5633274
• Journal Information: Coke Chem. USSR (Engl. Transl.); (United States), Journal Name: Coke Chem. USSR (Engl. Transl.); (United States) Vol. 4; ISSN COKCA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010401* -- Coal & Coal Products-- Carbonization-- (-1987)
010800 -- Coal
Lignite
& Peat-- Waste Management
ASIA
COKING PLANTS
COLLOIDS
DISPERSIONS
EASTERN EUROPE
EMULSIONS
EUROPE
FLOCCULATION
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
IRON COMPOUNDS
IRON SULFATES
LIQUID WASTES
OXYGEN COMPOUNDS
PRECIPITATION
SEPARATION PROCESSES
SLUDGES
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
USSR
WASTE PRODUCT UTILIZATION
WASTE WATER
WASTES
WATER
WATER TREATMENT