Treatment of coke-oven wastewater with the powdered activated carbon-contact stabilization activated sludge process. Final report

Technical Report · Tue Nov 01 04:00:00 EST 1983

DOI:https://doi.org/10.2172/5163907· OSTI ID:5163907

Suidan, M. T.; Deady, M. A.; Gee, C. S.

The objective of the study was to determine optimum parameters for the operation of an innovative process train used in the treatment of coke-over wastewater. The treatment process train consisted of a contact-stabilization activated sludge system with powdered activated carbon (PAC) addition, followed by activated sludge nitrification, followed by denitrification in an anoxic filter. The control and operating parameters evaluated during the study were: (a) the average mixed-liquor PAC concentration maintained in the contact-stabilization system, (b) the solids retention time practiced in the contact-stabilization system, and (c) the hydraulic detention time maintained in the contact aeration tank. Three identical treatement process trains were constructed and employed in this study. The coke-oven wastewater used for this investigation was fed to the treatment units at 30% strength. The first part of the study was devoted to determining the interactions between the mixed liquor PAC concentration and the solids retention time in the contact-stabilization tanks. Results showed that optimum overall system performance is attainable when the highest sludge age (30 day) and highest mixed liquor PAC concentration were practiced. During the second phase of the study, all three systems were operated at a 30 day solids retention time while different detention times of 1, 2/3 and 1/3 day were evaluated in the contact tank. PAC addition rates were maintained at the former levels and, consequently, reduced contact times entailed higher mixed liquor carbon concentrations. Once again, the system receiving the highest PAC addition rate of PAC exhibited the best overall performance. This system exhibited no deterioration in process performance as a result of decreased contact detention time. 72 references, 41 figures, 24 tables.

• Research Organization: Illinois Univ., Urbana (USA). Dept. of Civil Engineering
• DOE Contract Number: FG22-80PC30233
• OSTI ID: 5163907
• Report Number(s): DOE/PC/30233-T4; ON: DE84008300
• 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
ACTIVATED CARBON
ACTIVATED SLUDGE PROCESS
ADSORBENTS
ADSORPTION
CARBON
CHEMICAL REACTIONS
COKE OVENS
DATA
DENITRIFICATION
ELEMENTS
EXPERIMENTAL DATA
FUNCTIONS
HYDROGEN COMPOUNDS
INFORMATION
KINETICS
LIQUID WASTES
MANAGEMENT
NONMETALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PROCESSING
RETENTION FUNCTIONS
SORPTION
STABILIZATION
TIME DEPENDENCE
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER