Selectively enriched mixed sulfate-reducing bacteria for acrylamide biodegradation
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ORIGINAL PAPER
Selectively enriched mixed sulfate‑reducing bacteria for acrylamide biodegradation K. Tahir1,2 · W. Miran3 · J. Jang4 · A. Shahzad1 · M. Moztahida1 · H. Jeon1 · B. Kim1 · S.‑R. Lim5 · D. S. Lee1 Received: 19 March 2020 / Revised: 13 May 2020 / Accepted: 16 June 2020 © Islamic Azad University (IAU) 2020
Abstract Acrylamide (AM) is a carcinogen and neurotoxicant, and its growing application in numerous industrial processes is contaminating the environment. In addition, the inhibitory effect of AM makes its biodegradation in the environment challenging. This study investigated AM degradation using a selectively enriched inoculum of mixed sulfate-reducing bacteria (SRB) isolated from a local wastewater treatment plant in Daegu, Korea. The use of SRB is promising for effectively treating several environmental pollutants, but the feasibility for biodegrading AM has not yet been reported. Experimental results showed that 73% AM (initial concentration: 7 mM) biodegradation was achieved in just 120 h, together with 42% and 96% TOC and sulfate removal, respectively. In addition, the SRB performance was not significantly affected by a threefold increase in the AM concentration; biodegradation performance dropped by only 12%. These results imply SRB immunity toward lethal contaminants and the viability of using SRB in different treatment processes. The kinetic results of batch studies enabled development of a pseudo-first-order kinetic model for AM biodegradation, TOC, and sulfate removal. In addition, although the sulfate removal efficiency was affected by a higher sulfate loading, it had little effect on AM and TOC removal. This study shows the potential of using SRB to effectively degrade recalcitrant pharmaceutical pollutants. Keywords Acrylamide · Biodegradation · Sulfate-reducing bacteria · Microbial community analysis
Introduction Editorial responsibility: Parveen Fatemeh Rupani. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13762-020-02819-5) contains supplementary material, which is available to authorized users. * D. S. Lee [email protected] 1
Department of Environmental Engineering, Kyungpook National University, 80 Daehak‑ro, Buk‑gu, Daegu 41566, Republic of Korea
2
Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, 1.5 KM Defence Road, Off Raiwind Road, Lahore 54000, Pakistan
3
International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1‑1 Namiki, Tsukuba, Ibaraki 305‑0044, Japan
4
R&D Institute of Radioactive Wastes, Korea Radioactive Waste Agency, 174 Gajeong‑ro,Yuseong‑gu, Daejeon 34129, Republic of Korea
5
Department of Environmental Engineering, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
The increasing production of chemicals and their abundant global usage have caused severe environmental pollution and disorder of natural systems. In addition to the negative ecological impacts, several hormonal and genetic disorders
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