Modern air pollution control technologies have emerged over the past 40 years to mitigate emission problems in industrial facilities and thereby comply with environmental regulations. A variety of technologies have been developed to meet the needs of both the industries and the regulatory agencies keeping in view the techno economics. Some air pollutants like H2S, NH3 and VOC’s are emitted in the industry causes odour and this not only causes occupational health but also damages public image of the company. Engineered biofiltration is a sustainable technology for VOC and odor control. Bio-filtration is a method of pollution control in which pollutants are biologically degraded using microorganisms. Generally, the energy demands for biofiltration are one-fourth to one-tenth that of physico-chemical destructive technologies.
Biofilters are being developed and effectively used for a wide variety of industries, including wood products, paint manufacturing, petroleum remediation etc. Biofilters are cost-effective and straightforward options for pollutants capable of biodegrading reasonably easily.
Triethylamine(TEA) is a Volatile organic compound widely used as a catalyst for polymerization reactions and a solvent and corrosion inhibitor in industry and it is also used as an intermediate in the production of various chemicals, including pesticides. It is necessary to remove TEA from water and gas in the environment. TEA gas-phase bio treatment has emerged as an effective and inexpensive alternative to conventional physicochemical treatment systems. The technology is still under development in terms of economics, equipment, process kinetics, and operational skills and different layouts and flow trains are being proposed including biofiltration, biotrickling filter, and bioscrubber. In the present work, studies are being carried out on biofilter contaminated with TEA. The contaminated gas is passed through a packed bed where TEA compound is absorbed into the biofilm in which diffusion and aerobic biodegradation occur simultaneously in a complex set of physical, chemical and biological interactions. Therefore, selection of suitable microbial consortia and biofilter configuration is very important from commercial perspective.
Table of Contents
1 Introduction
2 Literature review
3 Materials and methods
3.1 Source of micro organisms
3.2 Specifications of biofilters
3.3 Packing materials
3.4 Air pump
3.5 Experimental procedure
3.6 VOC analyser
3.7 Performance of biofilter
3.7.1 Moisture content
3.7.2 Pressure drop
3.7.3 pH
3.7.4 Microbial count
3.7.5 Acclimination time
4 Results and disscusions
4.1 Performance of biofilter-1
4.2 Performance of biofilter-2
4.3 Performance of biofilter-3
5 Scope and discussions for future work
Research Objectives and Key Topics
The primary objective of this study is to investigate the efficacy of biofiltration systems in treating air contaminated with triethylamine (TEA), a volatile organic compound. The research focuses on isolating and identifying specific TEA-degrading microorganisms, understanding the microbial biodegradation pathways, and evaluating the performance of different biofilter configurations under varying operational parameters such as inlet concentration, moisture content, and pH.
- Isolation and identification of TEA-oxidizing bacteria from industrial effluent.
- Characterization of diverse filter bed materials for optimized biofiltration performance.
- Comparative analysis of different biofilter unit performance (Biofilter-1, -2, and -3).
- Evaluation of operational parameters including EBRT, removal efficiency, and pH stability.
Excerpt from the Book
Biofilter
Biofilter (BF) processes differ from scrubbing techniques in that no free liquid phase is involved. As far as waste air treatment is concerned, biofilters have proven cost effective operation mainly in two fields: odour abatement and organic solvent vapours removal from waste air steams. In this process, contaminated gas is passed through a reactor containing an active microbial biofilm attached to a solid packing medium. Contaminants are transferred from the gas phase to the biofilm where they are oxidized to carbon dioxide, water, and biomass. Contaminant transfer from the gas phase directly into the biofilm minimizes the mass transfer from the gas phase to a large moving aqueous phase and then to the biofilm [48].The basic components of a biofilter include a packed bed reactor, a system for maintaining moisture content, and a blower to push or pull contaminated air through the porous medium. Several process configurations may be used. For example, air flow may be either up-flow or down-flow and water may be added to maintain moisture content by humidifying influent air or to the filter bed via a sprinkler or soaker hose. Packing media may consist of natural materials (e.g., compost) or synthetic media such as porous ceramic pellets or polyurethane foam cubes [39].
BFs now find wide application in treatment of several VOCs and odours. Among these are odourants such as ammonia, hydrogen sulphide, mercaptan,disulphides, etc., and VOCs like TEA, propane, butane, styrene, phenols, ethylene chloride, methanol, etc. Bench and pilot scale studies have shown that 60 out of 189 hazardous air pollutants (HAPs) can be successfully treated with biofiltration [20][54]. In Europe, more than 600 chemical processing industries use BFs for deodorization and treatment of VOCs.
Summary of Chapters
1 Introduction: Provides an overview of air pollution control technologies, the environmental and health impacts of VOCs like triethylamine, and the principles of biological waste gas treatment.
2 Literature review: Discusses the historical context and development of biofiltration processes, biofilter operation, biofilm characteristics, and parameters influencing performance like nutrient availability, oxygen levels, and pH.
3 Materials and methods: Details the isolation of TEA-degrading bacteria, the specific setup and specifications of the biofilter units, packing materials used, and the analytical procedures for measuring system performance.
4 Results and disscusions: Presents the experimental data and comparative performance analysis of three distinct biofilter configurations under various load conditions and operating times.
5 Scope and discussions for future work: Summarizes the key findings regarding the effectiveness of TEA-degrading microbial strains and provides insights into the potential for future biofiltration system optimization.
Keywords
Biofilter, Triethylamine, TEA, Volatile Organic Compounds, VOC, Biodegradation, Biofilm, Air Pollution Control, Removal Efficiency, Microbial Consortia, Packing Material, Aeromonas, Industrial Effluent, Waste Gas Treatment, Elimination Capacity.
Frequently Asked Questions
What is the core focus of this research?
The research focuses on the biological purification of industrial air streams contaminated with triethylamine (TEA) using biofiltration technology.
What are the central themes discussed in this document?
Key themes include biofilter design, microbial degradation of volatile organic compounds, the impact of filter bed materials on efficiency, and the maintenance of operational parameters like moisture and pH.
What is the primary goal of the study?
The goal is to demonstrate that specific, isolated TEA-oxidizing bacterial strains can achieve high removal efficiency in a biofiltration system compared to traditional methods.
Which scientific methods were employed?
The study utilized bacterial isolation from soil, biochemical tests for identification, and long-term pilot testing of biofilter units under controlled airflow and concentration variables.
What topics are covered in the main section of the paper?
The main sections cover the literature review on biofiltration, materials and methodologies used, and the detailed presentation of performance data for three different biofilter configurations.
Which keywords best characterize this work?
The work is characterized by terms such as biofiltration, TEA, VOC, biodegradation, microbial consortia, and removal efficiency.
Why is triethylamine (TEA) considered a critical pollutant?
TEA is a volatile organic compound that is toxic, has a very low odor threshold, and poses severe health risks including dermal and respiratory irritation.
What were the findings regarding the acclimation of bacteria?
The study found that after an initial acclimation period of approximately 7 days, the system reached a stable removal efficiency of 99.9% to 100%.
How does biofilter-II compare to biofilter-I according to the results?
Biofilter-II, using specific co-cultures of TEA-assimilating bacteria, was found to be superior in terms of higher and more stable removal efficiency and pH control.
- Citar trabajo
- Venu Gopal (Autor), A.G Rao (Autor), M.P. Durga Prasad (Autor), 2012, Biofilter for the purification of air contaminated with triethylamine (TEA), Múnich, GRIN Verlag, https://www.grin.com/document/286444
