Analysis concerning the biological treatment of wastewater with high concentrations of ammonia nitrogen

The treatment of the domestic wastewaters in one biological treatment step with active sludge is limited by the practical treatment efficiency, which is max. 93%. This efficiency can provide satisfactory treatment when the wastewaters do not exceed the values from NTPA 002/2005. In case of the waste...

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Bibliographic Details
Published inAdvances in environmental sciences : international journal of the Bioflux Society Vol. 7; no. 2; pp. 163 - 172
Main Authors Crăciun, Ioan Mircea, Vlad, Grigore, Ignat, Daniela, Ciuban, Vasile, Berkesy, Corina M
Format Journal Article
LanguageEnglish
Published Cluj-Napoca Bioflux SRL 01.06.2015
Subjects
Aeration
Ammonia
Biological treatment
Chemical oxygen demand
Design specifications
Dry matter
Efficiency
Load
Nitrogen
Organic loading
Oxygen demand
Reduction
Sludge
Sludge treatment
Wastewater treatment
Romania
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Summary:The treatment of the domestic wastewaters in one biological treatment step with active sludge is limited by the practical treatment efficiency, which is max. 93%. This efficiency can provide satisfactory treatment when the wastewaters do not exceed the values from NTPA 002/2005. In case of the wastewaters that extensively exceed the values from the regulation standards and especially at the ammonia nitrogen indicator, the total efficiency called for tends to be 98% and cannot be optimally provided in one biological step, irrespective of the process applied. In this paper we set out a treatment technology in two biological steps, for domestic wastewaters with high concentrations of ammonia nitrogen, which provides an up to 98% total treatment efficiency, alongside a reduction of the specific oxygen demand from 4.3 kg O2/kg CBO5, as necessary for one treatment step, to 1.4 kg O2/kg CBO5, as needed in the two steps variant, and a reduction of the constructive equivalent total volume to 50%. The first step of biological treatment chosen is with high load aeration, where the sludge organic load ranges between 1.5 and 2 kg CBO5/kg dry matter/day, and the second step of biological treatment with a full mixture, where the sludge organic load is between 0.2 and 0.6 kg CBO5/kg dry matter/day. We will highlight the resemblances and the differences versus the known treatment processes, as well as the advantages and the disadvantages of the method on a practical application.
ISSN:2066-7620
2066-7647