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Long-term Effects of N-acyl-homoserine Lactone-Based Quorum Sensing on the Characteristics of ANAMMOX Granules in High-Loaded Reactors

Long-term Effects of N-acyl-homoserine Lactone-Based Quorum Sensing on the Characteristics of ANAMMOX Granules in High-Loaded Reactors

Jing Zhang, Jun Li, Bai-Hang Zhao, Ya-Chao Zhang, Xiu-Jie Wang, Guang-Hui Chen

Chemosphere. 2019 Mar;218:632-642.

PMID: 30502702

Abstract:

Laboratory experiments were carried out to determine the long-term effects of N-acyl-homoserine lactone (AHL)-based quorum sensing on the characteristics of ANAMMOX granules in high-loaded reactors. Results clearly showed that adding 30 mg L-1 N-octanoyl-DL-homoserinelactone (C8-HSL) at the initial stage (1-40 d) of the experiment had long-term positive effects on the settleability of granules and controlled the sludge floatation effectively. C8-HSL decreased the content of bound extracellular polymeric substances (B-EPS) and the ratio of protein to carbohydrate (PN/PS) by 17% and 48%, respectively and increased the relative hydrophobicity (RH) of the granules by 28%. The results of batch tests indicated that C8-HSL significantly reduced the content of loosely-bound EPS (LB-EPS) in the B-EPS, which was responsible for variations in granule settleability and stability. Thus, the settleability of the granules was improved significantly due to addition of C8-HSL, contributing to operational stability and the high TN removal efficiency of the reactor. On day 150, when the nitrogen loading rates of all reactors were 13.4 kg TN m-3 d-1, the nitrogen removal rate and nitrogen removal efficiency of the reactor with C8-HSL (R3) were up to 11.2 kg TN m-3 d-1 and 88%, respectively. N-hexanoyl-DL-homoserine lactone (C6-HSL) improved activity of the granules, while N-dodecanoyl-DL-homoserine lactone (C12-HSL) had no effect on the characteristics of the granules. The long-term effects of C8-HSL on the settleability of granules may be attributed to sustainable release of endogenous signals induced by exogenous signal.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP76924953	N-(β-Ketocaproyl)-DL-homoserine lactone		76924-95-3	Price

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