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Correlation between the uncoupling metabolism induced by 2,4,6-trichlorophenol and sludge toxicity in sequence batch

Xiurong Chen1, Quanling Lu1, Shanshan Wang1

  • 1Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China and National Engineering Laboratory for High-concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai 200237, China

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|December 2, 2020
PubMed
Summary

This study found that 2,4,6-trichlorophenol (2,4,6-TCP) effectively reduces sludge in wastewater treatment. Higher concentrations increased sludge reduction and toxicity, with 30 mg/L of 2,4,6-TCP identified as optimal.

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Area of Science:

  • Environmental Science
  • Environmental Engineering
  • Biotechnology

Background:

  • Wastewater treatment processes generate excess sludge, posing disposal challenges.
  • Chemical uncouplers can induce sludge reduction, but their impact on toxicity requires investigation.
  • 2,4,6-trichlorophenol (2,4,6-TCP) is explored as a potential agent for sludge reduction.

Purpose of the Study:

  • To investigate the correlation between sludge reduction induced by 2,4,6-TCP and sludge toxicity.
  • To determine the optimal concentration of 2,4,6-TCP for effective sludge management in sequence batch reactors.
  • To analyze the relationship between sludge reduction, chemical oxygen demand (COD) removal, and sludge toxicity.

Main Methods:

  • Sequence batch reactors (SBRs) were operated for 100 days.
  • Influent concentrations of 2,4,6-TCP tested were 10 mg/L, 30 mg/L, and 50 mg/L.
  • Measurements included sludge reduction, COD removal rate, sludge toxicity, and protein analysis using 2D-PAGE.

Main Results:

  • Sludge reduction increased with 2,4,6-TCP concentration, reaching 41.5% at 50 mg/L.
  • Sludge toxicity also increased, correlating positively with sludge reduction (up to 53.0% at 50 mg/L).
  • Extracellular and intracellular proteins were linked to increased sludge toxicity.

Conclusions:

  • Sludge reduction induced by 2,4,6-TCP is positively correlated with sludge toxicity.
  • An optimal influent concentration of 30 mg/L 2,4,6-TCP was identified for balancing sludge reduction and acceptable COD removal.
  • Wastewater treatment managers can utilize these findings for efficient sludge management strategies.