Procedure of designing wastewater biological treatment facilities
with nutrients removal

Summary

The procedure of designing wastewater biological treatment facilities with nitrification-denitrification is presented. Biological treatment facilities shall be designed on the basis of experimentally determined kinetic constants, nitrification and denitrification process factors, and for every limiting value depending on the requirements to the quality of treatment. Kinetic constants and factors required for designing municipal wastewater treatment facilities are given. Design algorithm is set out including the following stages: substantiation of the initial data on flow rates and qualitative wastewater composition according to the required level of reliability (more than 85–90% probability); selection of the process flow scheme – number of steps and(or) stages, operation procedure and lay out; determination of kinetic constants of equations of enzyme kinetics of every basic pollution component transformation from experimental data or from the available data base; preliminary calculation of excess activated sludge volume and adjustment of nitrogen and phosphorus mass balance; determination of limiting pollution component that needs maximum time to be oxidized; calculation of the facility capacity by limiting component with determination of the treatment level for other pollution components. The results of the long-term experimental studies of nitrification-denitrification processes with different types of municipal and industrial wastewater provide for supplementing the method of aeration tank design specified in SNiP 2.04.03-85 with formulae and data for design and optimization of aeration tank operation with nitrogen and phosphorus removal.

Key words

wastewater , biological treatment , nitrification , activated sludge , kinetic constants , denitrification

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REFERENCES

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