This study combined an algae treatment with post-ozonation for the robust treatment of piggery effluent in which high levels of organic constituents, inorganic nutrients, color, and salts remained. Due to a nearly complete light limitation resulting from a high level of color, the algae treatment was conducted with continuous O2 supplementation instead of using the combination of high lighting and CO2 injection. The microalga Acutodesmus obliquus KGE-17 showed tolerance to high salinity (up to 5.2% as chloride) and was capable of utilizing dissolved organics (1923 mg-COD/(g-cell)(day)) under the heterotrophic growth conditions. The use of A. obliquus for remediation of piggery effluent also resulted in an operational simplicity in the simultaneous removal of nitrogen and phosphorus in a single treatment process, in contrast to conventional biological nutrient removal processes. Subsequent ozonation was successful in decolorizing the algae-treated wastewater and in improving the biodegradability of residual organics in post-treatment processes.
Bibliographical noteFunding Information:
This work was supported by the Korea Institute of Science and Technology (KIST) Institutional Program ( 2E26300 ), the Eco-Innovation Technology Development Project (Grant no. 405-112-037 ) funded by the Ministry of Environment , and the R&D Program for Society of the National Research Foundation (NRF) funded by the Ministry of Science , ICT and Future Planning ( 2014M3C8A4030496 ), South Korea . This research was also partially supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science , ICT and Future Planning ( 2015R1A2A2A03005744 ).
© 2016 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Biomedical Engineering