Sludge Pre-Treatment through Ozone Application: Alternative Sludge Reuse Possibilities for Recirculating Aquaculture System Optimization


Contact
Desislava.Boegner [ at ] awi.de

Abstract

Recirculating Aquaculture Systems (RAS) reduce water consumption by efficient filtration to maintain appropriate levels of accumulating compounds and sludge. Sludge is mechanically separated by drum filters and disposed of to the detriment of overall system water budgets. Dissolved nitrogen compounds are reduced via nitrification–denitrification filters, requiring commercial external carbon sources. The reuse of sludge after ozone pre-treatment may represent the next step in RAS optimization. The present study analyzes the content of sludge from RAS and tests ozonation as a pre-treatment for recycling as carbon source. The dissociative effect of ozone and the physicochemical changes due to ozonation lead to a significant increase in soluble carbon availability. Predominantly long-chain fatty acid (FA) (saturated and unsaturated) with 16 and 18 carbon atoms independently of the treatment were found in the profiles. Saturated FA concentrations in solution increased after 20, 40, and 60 min ozonation. The solid content of the sludge was practically unaffected by ozonation in terms of FA profile: only saturated FA slightly increases after 40 min treatment. The implications of these findings for denitrifying bacteria are discussed. Abbreviations: Recirculating Aquaculture Systems (RAS); Advanced Oxidation Processes (AOPs).



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Publication Status
Published
Eprint ID
47953
DOI https://www.doi.org/10.1080/01919512.2018.1510765

Cite as
Bögner, D. , Schmachtl, F. , Mayr, B. , Franz, C. P. , Strieben, S. , Jaehne, G. , Lorkowski, K. and Slater, M. J. (2018): Sludge Pre-Treatment through Ozone Application: Alternative Sludge Reuse Possibilities for Recirculating Aquaculture System Optimization , Ozone: Science & Engineering, 41 (2), pp. 105-117 . doi: https://www.doi.org/10.1080/01919512.2018.1510765


Download
[thumbnail of Boegner_D_et_al_2018.pdf]
Preview
PDF
Boegner_D_et_al_2018.pdf

Download (2MB) | Preview

Share


Citation

Geographical region
N/A

Research Platforms
N/A

Campaigns
N/A

Funded by
31367/01-23


Actions
Edit Item Edit Item