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Specific affinity and relative abundance of methanogens in acclimated anaerobic sludge treating low-strength wastewater

  • Applied microbial and cell physiology
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Abstract

Kinetic parameters affecting effluent water quality including half saturation constant (Ks), maximum specific growth rate (μmax), and specific affinity (\( {a}_A^0 \), defined as μmax/Ks) were investigated using three types of anaerobic sludge (raw anaerobic digestion sludge referred to as unacclimated sludge, unacclimated sludge after endogenous decay, and sludge acclimated to low-strength wastewater in an anaerobic membrane bioreactor (AnMBR) for 360 days). Long-term acclimation to low-strength wastewater resulted in sludge with high specific affinity (1.6 × 10−3 L/mg COD/day for acclimated sludge compared to 4.1 × 10−4 L/mg COD/day for unacclimated sludge). The μmax values for unacclimated sludge and acclimated sludge were 0.08 and 0.07 day−1, respectively. The Ks values for unacclimated sludge and acclimated sludge were 194 ± 81 mg COD/L and 45 ± 13 mg COD/L, respectively. Although the Ks of unacclimated sludge after endogenous decay increased to 772 ± 74 mg COD/L, μmax increased to 0.35 day−1 as well, resulting in no statistically significant difference of \( {a}_A^0 \) between the two types of unacclimated sludge. Overall, \( {a}_A^0 \) is a better indicator than μmax or Ks alone for determining effluent water quality, as effluent substrate concentration is approximately inversely proportional to the specific affinity. 16S rRNA sequencing data analysis indicated a high abundance (85.8% of total archaea) of Methanosaeta in the microbial community after long-term acclimation. High \( {a}_A^0 \) associated with the enrichment of Methanosaeta appears to ensure successful anaerobic treatment of low-strength wastewater.

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Correspondence to Junyuan Ji or Zhiqiang Hu.

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Hou, L., Griswold, N., Ji, J. et al. Specific affinity and relative abundance of methanogens in acclimated anaerobic sludge treating low-strength wastewater. Appl Microbiol Biotechnol 104, 291–302 (2020). https://doi.org/10.1007/s00253-019-10149-x

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  • DOI: https://doi.org/10.1007/s00253-019-10149-x

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