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Updated: Apr 18, 2026

Use of a Battery of Chemical and Ecotoxicological Methods for the Assessment of the Efficacy of Wastewater Treatment Processes to Remove Estrogenic Potency

Use of a Battery of Chemical and Ecotoxicological Methods for the Assessment of the Efficacy of Wastewater Treatment Processes to Remove Estrogenic Potency

Published on: September 11, 2016

Sludge reduction at low ozone doses: predictive effects and full-scale study.

P Romero¹, M D Coello¹, C A Aragón²

¹Department of Environmental Technology, Faculty of Marine and Environmental Sciences, Universidad de Cádiz, Poligono Rio San Pedro s/n, 11510 Puerto Real, Cadiz, Spain

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|January 31, 2015

Summary

This summary is machine-generated.

Ozonation of activated sludge can reduce excess sludge production (ESP) by 10% in wastewater treatment. This study optimized ozone dosage and application methods for effective ESP reduction with minimal impact on biomass activity.

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Area of Science:

Environmental Engineering
Water Treatment Technologies
Biotechnology

Background:

Activated sludge is a primary wastewater treatment method.
Excess sludge production (ESP) is a significant drawback of this process.
Ozonation of recirculated sludge offers a potential solution for ESP reduction.

Purpose of the Study:

To investigate the effectiveness of ozonation on a fraction of recirculated sludge in a full-scale plant.
To evaluate the impact of lower specific ozone doses (SOD) on biomass activity.
To determine optimal operational parameters for full-scale ozonation to reduce ESP.

Main Methods:

Application of ozonation to a fraction of recirculated sludge in a 50,000 population equivalent plant.
Batch tests to assess changes in nitrification/denitrification rates, phosphate-accumulating organisms, and gravitational properties.
Evaluation of specific ozone doses (SOD) ranging from 0.7 to 5 g O₃/kg MLVSS.

Main Results:

A 10% reduction in dry solids ESP was achieved with SOD between 1.03 and 1.63 g O₃/kg MLVSS.
Ozonation impact on sludge kinetic parameters decreased at SOD > 2 g O₃/kg MLVSS.
The ratio of ozonated to total biomass was identified as a key operational parameter.

Conclusions:

Ozonation is an effective method for reducing ESP in activated sludge systems.
Optimizing SOD and the fraction of ozonated sludge is crucial for minimizing negative impacts on biomass.
The study provides valuable insights for the implementation of ozonation in full-scale wastewater treatment plants, including economic cost analysis.