Journal
BIORESOURCE TECHNOLOGY
Volume 200, Issue -, Pages 820-829Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.10.063
Keywords
Polyhydroxyalkanoates; Nitrogen removal; Nitritation/denitritation; Fermentation liquid; Feast/famine
Funding
- Ministerio de Educacion, Cultura y Deporte
- Water_2020 (COST Action ES1202)
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A novel scheme was developed for the treatment of municipal wastewater integrating nitritation/denitritation with the selection of polyhydroxyalkanoates (PHA) storing biomass under an aerobic/anoxic, feast/famine regime. The process took place in a sequencing batch reactor (SBR) and the subsequent PHA accumulation in a batch reactor. The carbon source added during the selection and accumulation steps consisted of fermentation liquid from the organic fraction of municipal solids waste (OFMSW FL) (Period I) and OFMSW and primary sludge fermentation liquid (Period II). Selection of PHA storing biomass was successful and denitritation was driven by internally stored PHA during the famine phase. Under optimum conditions of SBR operation ammonia removal was 93%, reaching a maximum nitrite removal of 98%. The treated effluent met the nitrogen limits, while PHA-storing biomass was successfully selected. The maximum accumulation of PHA was 10.6% (wt.) since the nutrients present in the carbon source promoted bacterial growth. (C) 2015 Elsevier Ltd. All rights reserved.
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