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Biogas Purification through the use of a Microalgae-Bacterial System in Semi-Industrial High Rate Algal Ponds

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Formaldehyde removal from air by a biodegradation system.

Zhongjun Xu¹, Haiping Hou

¹Department of Environmental Science and Engineering, Beijing University of Chemical Technology, 100029 Beijing, China. zhongjunxu@163.com

Bulletin of Environmental Contamination and Toxicology

|April 17, 2010

Summary

This study shows a trickling biofilter effectively treats formaldehyde-polluted air, achieving high degradation efficiency. It performs better than activated sludge for lower formaldehyde concentrations.

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Area of Science:

Environmental Science
Environmental Engineering
Biotechnology

Background:

Formaldehyde is a common air pollutant requiring effective treatment methods.
Biodegradation systems offer a promising biological approach for air pollution control.

Purpose of the Study:

To evaluate the performance of a trickling biofilter for formaldehyde biodegradation.
To compare the degradation capacity and efficiency of the biofilter with activated sludge.

Main Methods:

A trickling biofilter system was operated for approximately 4 months to treat formaldehyde-polluted air.
The system's degradation capacity and efficiency were measured across varying influent formaldehyde concentrations (20-300 mg m(-3)).
Performance was compared against an activated sludge bioreactor.

Main Results:

The trickling biofilter demonstrated a formaldehyde degradation capacity of 4.0-40.0 mg h(-1) with efficiencies ranging from 100% to 66.7%.
The biofilter outperformed activated sludge in formaldehyde removal at influent concentrations below 200 mg m(-3).
Conversely, activated sludge showed higher degradation amounts than the biofilter at concentrations exceeding 200 mg m(-3).

Conclusions:

Trickling biofilters are effective for treating formaldehyde-polluted air, particularly at lower concentrations.
The choice between trickling biofilters and activated sludge depends on the influent formaldehyde levels.
Further research can optimize biofilter design for enhanced formaldehyde removal across a wider range of concentrations.