Significant performance enhancement of a UASB reactor by using acyl homoserine lactones to facilitate the long filaments of Methanosaeta harundinacea 6Ac

Applied Microbiology and Biotechnology
Lingyan LiXiuzhu Dong

Abstract

Methanosaeta strains are frequently involved in the granule formation during methanogenic wastewater treatment. To investigate the impact of Methanosaeta on granulation and performance of upflow anaerobic sludge blanket (UASB) reactors, three 1-L working volume reactors noted as R1, R2, and R3 were operated fed with a synthetic wastewater containing sodium acetate and glucose. R1 was inoculated with 1-L activated sludge, while R2 and R3 were inoculated with 200-mL concentrated pre-grown Methanosaeta harundinacea 6Ac culture and 800 mL of activated sludge. Additionally, R3 was daily dosed with 0.5 mL/L of acetyl ether extract of 6Ac spent culture containing its quorum sensing signal carboxyl acyl homoserine lactone (AHL). Compared to R1, R2 and R3 had a higher and more constant chemical oxygen demand (COD) removal efficiency and alkaline pH (8.2) during the granulation phase, particularly, R3 maintained approximately 90 % COD removal. Moreover, R3 formed the best granules, and microscopic images showed fluorescent Methanosaeta-like filaments dominating in the R3 granules, but rod cells dominating in the R2 granules. Analysis of 16S rRNA gene libraries showed increased diversity of methanogen species like Methanosarcina and Metha...Continue Reading

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Citations

Aug 24, 2018·Environmental Microbiology Reports·Takashi NarihiroWen-Tso Liu
Jul 18, 2018·Frontiers in Microbiology·Maria C GaglianoCaroline M Plugge
Mar 17, 2020·Frontiers in Microbiology·Maria Cristina GaglianoCaroline M Plugge
Feb 9, 2021·Frontiers in Microbiology·Patricia Bovio-WinklerClaudia Etchebehere
Feb 19, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Huizhi HuXiangguo Zeng
Sep 26, 2020·Biochemical and Biophysical Research Communications·James A Shapiro
Jan 11, 2020·New Biotechnology·Maria Cristina GaglianoCaroline M Plugge
Nov 7, 2021·Bulletin of Mathematical Biology·A TenoreL Frunzo

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