Compliant, Stable Effluent in Coking Plant

The application of BioRemove COD to a coking plant’s wastewater treatment system helped ensure compliance and stable effluent.

Benefits

• Reduced Sludge Volume Index by 40%
• Maintained COD removal efficiency despite 43.2% increase in influent COD

Background

The treatment plant of a particular company’s coking branch operated under strict management and high environmental protection standards. Overall, the operation of the wastewater treatment system at the plant was good; however, the treatment plant hoped to further ensure compliant and stable effluent.

The secondary sedimentation tank effluent COD fluctuated greatly between 145-307 ppm, and large amounts of chemical flocculants had to be added to ensure effluent water quality.

Application

A bioaugmentation program was designed for the plant based on their specific situation, recommending BioRemove COD for a dosing period of 60 days. The goal of the program was to improve the biomass’ COD removal capabilities at higher loading rates, while improving floc structure to improve settling.

Results

System data from May 1 to July 31 was analyzed to determine the effect of the bioaugmentation program on the system in reference to COD changes, sludge concentration changes, dilution water and flocculant reduction.

Over the course of the program, influent COD increased, due to an increase in influent volume after the bioaugmentation program began. The use of BioRemove COD maintained a relatively stable COD effluent under substantial increases in the influent loads.

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BioRemove COD

BioRemove COD is a versatile product for industrial and municipal wastewater, effective within highly complex waste streams. It offers a diverse set of microorganisms that target a wide range of organics found in a variety of industries. BioRemove COD delivers the broadest range of biological activity and helps maintain wastewater system compliance and control.

• Improves BOD/COD degradation, floc formation, and settleability
• Lowers operating costs by reducing surcharges and permit violations
• Blend of specialized microorganisms able to degrade a wide variety of organics
• Supports production of a high-quality effluent with fewer system upsets

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After the bioaugmentation program, the system’s sludge activity improved significantly.

Furthermore, bioaugmentation significantly improved sludge settling.

Despite an increase in water flow during the program, the effluent COD remained stable, representing improved COD removal efficiency.

For multiple reasons, (oils, greases, filaments, poor settling, etc.), foam is a common problem for wastewater treatment in coking plants. After adding BioRemove COD, foam was significantly reduced due to improved settlement and overall reduction of oils and greases.

Conclusion

EnviroZyme’s biological program was easy to implement and provided significant benefits over alternatives, increasing COD removal efficiency. The use of BioRemove COD resulted in:

• Improved plant efficiency
• Simplified operations