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Factors Affecting Activity Coefficient

Factors Affecting Activity Coefficient

The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size.
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a decrease in the...

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Assessment of Labile Organic Carbon in Soil Using Sequential Fumigation Incubation Procedures

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Effect of stabilization on biomass activity.

Emine Ubay Cokgor¹, Didem Okutman Tas, Gulsum Emel Zengin

¹Istanbul Technical University, Environmental Engineering Department, 34469 Maslak, Istanbul, Turkey. ubay@itu.edu.tr

Journal of Biotechnology

|July 28, 2011

Summary

Aerobic/anoxic sludge stabilization shows higher efficiency in removing organic matter and biomass compared to aerobic methods alone. This process offers better performance for municipal sludge treatment.

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Area of Science:

Environmental Engineering
Water Treatment Technologies
Biotechnology

Background:

Municipal sludge stabilization is crucial for reducing organic matter and pathogen content.
Aerobic and aerobic/anoxic processes are common methods for sludge stabilization.
Assessing removal efficiencies and biomass activity is key to process optimization.

Purpose of the Study:

To compare the efficiency of aerobic and aerobic/anoxic stabilization processes for municipal sludge.
To evaluate the removal of organic matter and biomass under different stabilization conditions.
To quantify active biomass concentration and its changes during stabilization.

Main Methods:

Municipal sludge was subjected to aerobic and aerobic/anoxic stabilization.
Key parameters monitored included suspended solids (SS), volatile suspended solids (VSS), total organic carbon (TOC), and dissolved organic carbon (DOC).
Oxygen uptake rate (OUR) was measured to determine active biomass concentration.

Main Results:

Aerobic/anoxic stabilization achieved higher removal efficiencies for SS (25%), VSS (27%), and TOC (67%) compared to aerobic stabilization (SS: 22%, VSS: 28%, TOC: 55%) by day 30.
Removal rates for SS and VSS were significantly higher under aerobic/anoxic conditions (102 mg SS/L day, 63 mg VSS/L day) versus aerobic conditions (60 mg SS/L day, 47 mg VSS/L day) by day 17.
Active biomass ratios decreased over time in both processes, with aerobic stabilization showing reductions to 30% and 24% by days 17 and 30, respectively.

Conclusions:

Aerobic/anoxic sludge stabilization demonstrates superior performance in organic matter and biomass removal compared to aerobic stabilization alone.
The findings highlight the effectiveness of aerobic/anoxic conditions for enhanced sludge stabilization.
Understanding biomass activity changes is important for assessing the potential applications of stabilized sludge.