Development of a biofilter media for removal of hydrogen sulphide

2013 ◽  
Vol 11 (2) ◽  
pp. 218-222
Keyword(s):  
Base Material ◽  
Environmental Benefits ◽  
Industrial Facility ◽  
Sulphur Compounds ◽  
Industrial Facilities ◽  
Binding Agents ◽  
Volatile Organic ◽  
And Performance ◽  
Micro Organisms ◽  
Reduced Sulphur Compounds

Industrial facilities emit pollutant air that contains volatile organic compounds (VOCs) and reduced sulphur compounds (RSCs) which are nuisance, corrosive to materials and dangerous to health. In recent years, biofiltration has replaced numerous conventional processes (i.e. adsorption) due to its more effective, economical and environmental benefits. Thus, increasingly industrial facility operators are adopting biofilters for removal of air pollutants. Biofiltration takes place in bioreactors that are packed with media particles. On these media particles micro-organisms form biofilms where biological oxidation takes place. The new biofilter media developed in this study consists of a base material, hydrophobic coatings, nutrients and binding agents. In this contribution, method of development, evaluation and performance of this new bioreactor media are discussed.

Impact of septic compounds and operational conditions on the microbiology of an activated sludge system

2007 ◽  
Vol 55 (6) ◽  
pp. 135-142 ◽  
Author(s):  
Carl Pelletier ◽  
Mary Ann Fitzsimmons ◽  
Sophie Deschênes ◽  
Michael Paice
Keyword(s):  
Activated Sludge ◽  
Digital Imaging ◽  
Volume Index ◽  
Operating Parameters ◽  
Sludge Volume Index ◽  
Sulphur Compounds ◽  
Operational Conditions ◽  
Volatile Organic ◽  
Volatile Organic Acids ◽  
Reduced Sulphur Compounds

In activated sludge (AS) biotreatment, septic compounds such as volatile organic acids and reduced sulphur compounds have been frequently cited as a major cause of Thiothrix and Type 021N filamentous bulking. These filaments are common in Canadian pulp and paper biotreatment systems, where they cause settling problems in secondary clarifiers. We conducted a 14-week study of a TMP/newsprint mill effluent to characterize the septic compounds entering the biotreatment, and to determine correlations with AS biomass characteristics and biotreatment operating parameters. A significant correlation was found between the sludge volume index, the abundance of Type 021N, and the propionic acid (PA) concentration in the primary clarified effluent. PA also induced a significant change in the flocculating bacteria size distribution determined by digital imaging. Consequently, the correlation observed between PA and Type 021N bulking is an indirect effect of inhibition of floc-forming microorganisms, giving a competitive advantage to filaments.

scholarly journals Oxidation of volatile reduced sulphur compounds in biotrickling filter inoculated with Thiobacillus thioparus

2010 ◽  
Vol 13 (5) ◽  
pp. 0-0 ◽  
Author(s):  
Manuel Cáceres ◽  
Marjorie Morales ◽  
Ricardo San Martín ◽  
Homero Urrutia ◽  
Germán Aroca
Keyword(s):  
Biotrickling Filter ◽  
Sulphur Compounds ◽  
Thiobacillus Thioparus ◽  
Reduced Sulphur Compounds

Experimental Evaluation and Comparison of the Performance and Emissions of a Regenerative Gas Microturbine Using Biodiesel From Various Sources as Fuel

2007 ◽  
Author(s):  
Marco A. R. Nascimento ◽  
Electo S. Lora ◽  
Guido A. Sierra R. ◽  
Manuel A. Rendon
Keyword(s):  
Palm Oil ◽  
Heat Rate ◽  
Environmental Benefits ◽  
Steady State Condition ◽  
Turbine Engine ◽  
Performance And Emissions ◽  
Heat Value ◽  
Unburned Hydrocarbons ◽  
Micro Turbine ◽  
And Performance

Biodiesel is an alternative fuel that has become more attractive recently because of its environmental benefits and the fact that it is made from renewable resources. As it can be blended in any proportion with mineral Diesel, and there are several reports which presented substantial reductions in emissions of unburned hydrocarbons, carbon monoxide and particulate in IC engines without reducing the output power significantly. The aim of this work was to perform an emissions and performance experimental analysis to evaluate and compare the use of Biodiesel obtained from different sources, Castor, Soy and Palm Oil, on a 30 kW regenerative gas micro turbine engine installed in the laboratories of the Federal University of Itajuba´ – Unifei, Brazil, at different power levels at steady state condition. All the fuels were characterized in terms of its viscosity and heat value, and the thermal performance and the emissions were measured. In all cases, it was performed a comparison between the obtained results with Biodiesel and Diesel. None of the fuels presented any problem related to atomization process in the related tests, and have shown no significant changes in performance of the microturbine reaching levels of around 26% of thermal efficiency. The minimum Heat Rate obtained at full load, was for the Biodiesel from Palm oil case, and the maximum was for Castor oil with a value 8.38% higher than when operated with Diesel. In Addition, when measuring pollutants emissions in the exhaust gases, it was observed a slightly increment in CO and a reduction in NOx concentration.

NATURE-BASED SOLUTIONS FOR CLIMATE RESILIENT BUILDINGS AND CITIES

2020 ◽  
Author(s):  
Barbara Widera
Keyword(s):  
Urban Design ◽  
Well Being ◽  
Sustainable Growth ◽  
Environmental Benefits ◽  
Raw Material ◽  
End User ◽  
Material Consumption ◽  
Local Conditions ◽  
Sustainable Urbanization ◽  
And Performance

The paper addresses the topic of nature-based solutions applied in the architectural and urban design. These ideas are analyzed in the context of the opportunities they create for the humanity in terms of the sustainable growth and environmental protection. Nature-based solutions are inherently taken from nature. The first part of the paper presents their tremendous potential to be energy and resource-efficient, and resilient to change. In the second part of the research particular concepts driven from nature (copied form nature or inspired by nature) proposed for the buildings and cities are described and evaluated. The author discusses their functional usefulness, spatial appropriateness, adaptation to local conditions, end-user comfort, environmental benefits and the possibility of duplication. Nature-based solutions applied in urban planning can make cities more climate resilient and contribute to ecosystems restoration. The paper describes how sustainable urbanization can stimulate economic growth, make cities more attractive and enhance well-being of the inhabitants. It is also explained how particular buildings can benefit from the concepts driven from nature e.g. by increasing their energy efficiency and performance in terms of raw material consumption. In purpose to properly response to the climate challenge, humanity has to establish a new kind of partnership with nature. Using nature-based solutions should be considered as an important part of this approach. The concepts presented in this paper show some of the most promising options, such as integration of living systems with built systems and innovative combinations of soft and hard engineering. In conclusion some of the most promising nature-based solutions for climate resilient buildings and cities are indicated

scholarly journals Zeolite based microconcentrators for volatile organic compounds sensing at trace-level: fabrication and performance

2016 ◽  
Vol 26 (8) ◽  
pp. 084010 ◽  
Author(s):  
Fernando Almazán ◽  
Ismael Pellejero ◽  
Alberto Morales ◽  
Miguel A Urbiztondo ◽  
Javier Sesé ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Trace Level ◽  
Volatile Organic ◽  
And Performance

Emissions of reduced sulphur compounds from the surface of primary and secondary wastewater clarifiers at a Kraft Mill

2008 ◽  
Vol 156 (1-4) ◽  
pp. 37-49 ◽  
Author(s):  
Lionel Catalan ◽  
Victor Liang ◽  
Andrea Johnson ◽  
Charles Jia ◽  
Brian O’Connor ◽  
...  
Keyword(s):  
Sulphur Compounds ◽  
Kraft Mill ◽  
Reduced Sulphur Compounds

GT26 2006 Turbine Stage 1 Blade Reconditioning Development and Qualification at Ansaldo Repair Centre

2021 ◽  
Author(s):  
Elisa Mela ◽  
Federico Fignino ◽  
Alessio Gabrielli ◽  
Paola Guarnone ◽  
Emanuele Porro ◽  
...  
Keyword(s):  
Gas Turbines ◽  
Base Material ◽  
Repair Process ◽  
Market Demand ◽  
Technology Improvement ◽  
Industrial Gas Turbines ◽  
And Performance ◽  
Stage 1 ◽  
Welding Procedure ◽  
Repair Techniques

Abstract The evolution of industrial gas turbines towards increased efficiency and performance requires even higher operating temperatures for the engines. In order to remain competitive in the market, OEM companies continuously need to develop maintenance programs and repair technologies able to extend the life of these components as much as possible. The repair technology improvement is fundamental to reduce scrap rates and maintenance costs to be competitive on the market. The Ansaldo Repair Centre answers to this market demand by providing advanced and competitive repair techniques and an increasing broad repair portfolio to its customers. This paper describes the steps and approach to determine the repair process of GT26 LPT Blade 1 in order to allow the component to run another service interval. The base material status and the indication found after service was used as the foundation for a development of a dedicated repair sequence from stripping, to suitable heat treatments, to enhanced repair technique to recoating of the blade. Particular attention was paid to the most damaged area, for which a particular welding procedure including an optimized filler material has been applied for the rebuilding of the tip and platform zones as well as for the restoration of the unique tip closing features.

scholarly journals The Detection of Wound Infection by Ion Mobility Chemical Analysis

Biosensors ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 19 ◽  
Author(s):  
Emma Daulton ◽  
Alfian Wicaksono ◽  
Janak Bechar ◽  
James A. Covington ◽  
Joseph Hardwicke
Keyword(s):  
Donor Site ◽  
Area Under The Curve ◽  
Cost Effective ◽  
Wound Dressings ◽  
Control Group ◽  
Infected Wound ◽  
Non Invasive ◽  
Volatile Organic ◽  
Split Skin ◽  
Micro Organisms

Surgical site infection represents a large burden of care in the National Health Service. Current methods for diagnosis include a subjective clinical assessment and wound swab culture that may take several days to return a result. Both techniques are potentially unreliable and result in delays in using targeted antibiotics. Volatile organic compounds (VOCs) are produced by micro-organisms such as those present in an infected wound. This study describes the use of a device to differentiate VOCs produced by an infected wound vs. colonised wound. Malodourous wound dressings were collected from patients, these were a mix of post-operative wounds and vascular leg ulcers. Wound microbiology swabs were taken and antibiotics commenced as clinically appropriate. A control group of soiled, but not malodorous wound dressings were collected from patients who had a split skin graft (SSG) donor site. The analyser used was a G.A.S. GC-IMS. The results from the samples had a sensitivity of 100% and a specificity of 88%, with a positive predictive value of 90%. An area under the curve (AUC) of 91% demonstrates an excellent ability to discriminate those with an infected wound from those without. VOC detection using GC-IMS has the potential to serve as a diagnostic tool for the differentiation of infected and non-infected wounds and facilitate the treatment of wound infections that is cost effective, non-invasive, acceptable to patients, portable, and reliable.

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