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Abstract
Anammox and denitrification processes play important role in nitrogen removal in wastewater treatment. In final stage of nitrogen compounds metabolism nitrogen gas is produced and released to atmosphere. Process rates can be estimated based on amount of produced nitrogen, but this kind of procedure requires special equipment that may be a significant obstacle in bringing this type of tests to common practice in wastewater treatment plants. A low-cost device was constructed to verify if such installation may be a reliable alternative for expensive commercially available products (e.g. OxiTop ® system). Values of Specific Anammox Activity measured in different temperatures by constructed device and OxiTop ® system were consistent in 86.3%. Average gas production based on pressure growth exceed 94.9% the values obtained by use of chemical analysis. Conducted tests confirmed that low-cost manometric device can be a useful tool in denitrification/Anammox sludge activity tests.
Highlights
Excess nitrogen loads directed with wastewater to lakes and rivers have always been an important issue for their water quality and aquatic biodiversity
This paper presents a description of a self-made apparatus for manometric tests for denitrification/Anammox process rates assessment, including procedure description and validation test for mentioned installation based on comparison with analytical methods and parallel test performed in and OxiTop device
First step to verify if constructed installation can be used for manometric tests was to check its air-tightness by measuring potential pressure loss in time
Summary
Excess nitrogen loads directed with wastewater to lakes and rivers have always been an important issue for their water quality and aquatic biodiversity. In 90s, another crucial for nitrogen removal discovery has been made when Mulder et al [2] reported identification of new autotrophic microorganisms group able to anaerobic ammonium oxidation using nitrite, called Anammox (acronym for ANaerobic AMMonium OXidation). From this moment, process was successfully introduced in sidestream installations for ammonia-rich streams treatment, with over 100 full-scale implementations by 2014 [3]. Implementation of this process for the municipal wastewater treatment (called as mainstream Anammox) is supposed to be the major step for energy self-sufficient and highly effective WWTPs [4]
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