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Evaluation the role of soluble microbial products for denitrification sludge characteristic under starvation stress. | LitMetric

AI Article Synopsis

  • The study investigates how soluble microbial products (SMP) from preserved denitrifying sludge (DS) can help maintain physiological changes during long-term starvation stress at different temperatures.
  • Results indicate that adding SMP at room temperature (15-20 °C) significantly preserves the denitrifying activity of sludge, with the best outcome achieved using a dosage of 2.0 mL per mL of sludge over a 10-day bio-augmentation period.
  • The presence of SMP enhances the secretion of extracellular polymeric substances (EPS), providing a protective layer against starvation, while proteins in the SMP can serve as an energy source during the denitrification process.

Article Abstract

Physiological changes with the assist role of soluble microbial products (SMP) of preserved denitrifying sludge (DS) undergoing long-term stress of starvation under different storage temperature is extremely important. In this study, SMP extracted from DS were added into DS in starvation condition under room temperature (15-20 °C), 4 °C and -20 °C with three different bio-augmentation phases of 10, 15 and 30 days. Experimental results showed that added SMP in room temperature was optimal for preservation of DS under starvation stress with optimized dosage of 2.0 mL mL sludge and bio-augmentation phase of 10 d. SMP was more effective in maintaining the specific denitrification activity of DS, and it was nearly boosted to 94.1 % of control one due to assist of 2 times SMP addition with 10 days interval of each. Under assist of SMP, extracellular polymeric substances (EPS) secretion was enhanced as the defense layer to withstand starvation stress, and the protein may be utilized as an alternative substrate to gain energy, accelerate electron transport and transfer during denitrification process. This investigation revealed the feasibility of SMP as an economical and robust strategy for preservation of DS.

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Source
http://dx.doi.org/10.1016/j.scitotenv.2023.163319DOI Listing

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