Water 2016, 8(4), 117; doi:10.3390/w8040117
Acid Fermentation Process Combined with Post Denitrification for the Treatment of Primary Sludge and Wastewater with High Strength Nitrate
1
Department of Environment and Energy, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143‐747, Korea
2
Department of Civil and Environmental Engineering, Bogor Agricultural University, Jl. Kamper, Gedung FATETA, Kampus IPB Dramaga, Bogor, Jawa Barat 16680, Indonesia
3
Taeyoung Engineering and Construction, Yeouigongwon-ro 111, Yeougdeunpo-gu, Seoul 143‐747, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Yung-Tse Hung
Received: 21 January 2016 / Revised: 29 February 2016 / Accepted: 17 March 2016 / Published: 24 March 2016
Abstract
In this study, an anaerobic baffled reactor (ABR), combined with a post denitrification process, was applied to treat primary sludge from a municipal wastewater treatment plant and wastewater with a high concentration of nitrate. The production of volatile fatty acids (VFAs) was maximized with a short hydraulic retention time in the acid fermentation of the ABR process, and then the produced VFAs were supplied as an external carbon source for the post denitrification process. The laboratory scale experiment was operated for 160 days to evaluate the VFAs’ production rate, sludge reduction in the ABR type-acid fermentation process, and the specific denitrification rate of the post denitrification process. As results, the overall removal rate of total chemical oxygen demand (TCOD), total suspended solids (TSS), and total nitrogen (TN) were found to be 97%, 92%, 73%, respectively, when considering the influent into ABR type-acid fermentation and effluent from post denitrification. We observed the specific VFAs production rate of 0.074 gVFAs/gVSS/day for the ABR type-acid fermentation, and an average specific denitrification rate of 0.166 gNO3−-N/gVSS/day for the post denitrification. Consequently, we observed that a high production of VFAs from a primary sludge, using application of the ABR type acid fermentation process and the produced VFAs were then successfully utilized as an external carbon source for the post denitrification process, with a high removal rate of nitrogen. View Full-TextKeywords:
acid fermentation; anaerobic baffled reactor; nitrate; post denitrification; primary sludge; volatile fatty acids
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Kurniawan, A.; Kwon, S.Y.; Shin, J.-H.; Hur, J.; Cho, J. Acid Fermentation Process Combined with Post Denitrification for the Treatment of Primary Sludge and Wastewater with High Strength Nitrate. Water 2016, 8, 117.
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