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Variables affecting efficiency of molasses fermentation wastewater ozonation
1Departamento de Ingeniería Química y Tecnología del Medio Ambiente, Universidad de Valladolid, P(o) Prado de la Magdalena s/n, 47011 Valladolid, Spain. monicacocasanz@yahoo.es
Chemosphere
|August 2, 2005
Summary
Ozone treatment effectively removes color from beet molasses wastewater, with optimal results at 40°C. Bicarbonate ion removal enhances efficiency, though total organic carbon removal remains limited.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
Background:
- Beet molasses alcoholic fermentation generates wastewater with significant color and organic matter.
- Ozonation is a potential advanced oxidation process for treating such industrial effluents.
Purpose of the Study:
- To investigate the key operating variables influencing ozonation efficiency for beet molasses wastewater.
- To analyze the impact of pH, bicarbonate ion, temperature, and stirring rate on color and organic matter removal.
Main Methods:
- Semibatch experiments were conducted to evaluate ozonation parameters.
- Gel permeation chromatography was used to analyze organic compounds before and after treatment.
Main Results:
- Ozonation efficiency was largely independent of pH, suggesting direct ozone reactions dominate.
- Eliminating bicarbonate ions improved color and Chemical Oxygen Demand (COD) removal.
- Optimal temperature for highest efficiencies was 40°C, achieving ~90% color and ~37% COD reduction.
- Total Organic Carbon (TOC) removal was limited to 10-15%.
Conclusions:
- Direct ozone reactions are primary mechanisms in beet molasses wastewater ozonation.
- Bicarbonate inhibition necessitates its removal for enhanced treatment.
- Temperature control and understanding mass transfer are crucial for optimizing ozonation processes.