Substrate concentration‐independent aerobic granulation in sequential aerobic sludge blanket reactor

Abstract

The development of aerobic granules was studied in four column-type sequential aerobic sludge blanket reactors fed with different substrate concentrations ranging from 500 to 3000 mg l(-1) COD. Results showed that aerobic granules successfully formed in all reactors fed with different substrate concentrations, indicating that the formation of aerobic granules is independent of the substrate concentration. The granule size, roundness, compactness, physical strength, as well as cell surface hydrophobicity and cell polysaccharides contents of the cultivated aerobic granules were investigated. It was shown that aerobic granules formed with different substrate concentrations had similar roundness and compactness. However, the size of aerobic granules slightly increased with an increase in substrate concentration, while granule strength decreased with substrate concentration. It was found that there was a significant increase in cell surface hydrophobicity and cell polysaccharides of the aerobic granules compared to that of seed sludge. The high cell surface hydrophobicity and high cell polysaccharides contents were believed to play an important role in the formation of aerobic granules. However, substrate concentration seems not to be a governing factor for the formation of aerobic granules. The results of this study would be useful for developing aerobic granules-based bioreactor and for better understanding of the mechanism of aerobic granulation. It was also clearly demonstrated that aerobic granules-based bioreactor would have great potential in the treatment of high-strength wastewater.

Experimentation and mathematical models for partial nitrification in aerobic granular sludge process

“…A stable granular structure is dependent on the production of large Extracellular Polymeric Substances (EPS) by heterotrophic bacteria (Liu and Tay, 2004;Liu et al, 2003). Accordingly, the studies for the partial nitrification in aerobic granular sludge were mainly carried out under the presence of organic compounds.…”

Microbial extracellular polymeric substances: central elements in heavy metal bioremediation

“…Moreover, microbial EPS differs both in specifi city and metal-sorption capacity with only few functional groups potentially involved in cation-binding. In spite of all these constraints, the ease of application of purifi ed EPS and that in biofi lm, activated sludges or biogranules in bioremediation have demonstrated effi ciency in several studies which have led to a large number of reports favoring this approach [9][10][11][12][13][14][15][16].…”

Influence of Organic Loading Rates on Aerobic Granulation Process for the Treatment of Wastewater

“…Tay et al [8] studied the effect of OLR on the reactor performance and a moderate OLR was found to favour the development of stable aerobic granules. Liu et al [9] also studied the effect of substrate concentration on the formation, structure, and characteristics of aerobic granules and observed that granules can be successfully formed with influent COD concentrations from 500 to 3000 mg/l.…”