scholarly journals Simultaneous Removal of Hexane and Ethanol from Air in a Biotrickling Filter—Process Performance and Monitoring Using Electronic Nose

2020 ◽  
Vol 12 (1) ◽  
pp. 387
Author(s):  
Piotr Rybarczyk ◽  
Bartosz Szulczyński ◽  
Jacek Gębicki
Keyword(s):  
Electronic Nose ◽  
Synergistic Effects ◽  
Biotrickling Filter ◽  
Simultaneous Removal ◽  
Process Performance ◽  
Feed Composition ◽  
Hydrophobic Compounds ◽  
Start Up ◽  
Filter Process ◽  
Air Streams

Biofiltration is a well-accepted method for the removal of malodorous compounds from air streams. Interestingly, the mechanisms underlying this process are not fully understood. The aim of this paper was to investigate the simultaneous removal of hydrophobic hexane with hydrophilic ethanol, resulting in the enhanced removal of hexane in the presence of ethanol. Investigations were performed in a peat-perlite packed biotrickling filter and the process performance was monitored using both gas chromatography and electronic nose techniques. The results indicate that the length as well as the efficiency of biofiltration during the start-up period depend on the feed composition, with higher efficiency obtained when hexane and ethanol were fed together from the process initiation. The experiments in the steady-state period present the biofilter performance when different ratios of hydrophilic to hydrophobic compounds were fed to the biofilter. The obtained results show the synergistic effects of the addition of a hydrophilic compound on the removal efficiency of hydrophobic hexane. The influence of the ratio of hydrophilic to hydrophobic compounds is discussed in terms of enhancing the mass transfer phenomena for hydrophobic volatile organic compounds.

scholarly journals Investigating the species of microorganisms from activated sludge for handling phenol contaminated-air streams in biotrickling filter

2013 ◽  
Vol 16 (3) ◽  
pp. 96-105
Author(s):  
Anh Thi Kim Nguyen ◽  
Mi Thi Tra Le ◽  
Phu Ly Sy Nguyen ◽  
Nga Diep Yen Dang ◽  
Hien Thi To
Keyword(s):  
Bacillus Thuringiensis ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
High Efficiency ◽  
Bacillus Pumilus ◽  
Air Flow ◽  
Biotrickling Filter ◽  
Inlet Concentration ◽  
Air Streams ◽  
Removal Equipment

This research aimed at investigating the species of microorganisms from activated sludge is capable of handling gas-containing phenol vapor by means of trickling biofilter. By isolating and culturing microorganisms, two species, Bacillus pumilus and Bacillus thuringiensis, was discovered to dominate in phenol vapor removal equipment with high efficiency (about 90% with B. pumilus strain and 92% with B. thuringiensis strains) at inlet concentration about 650 - 850 mg/Nm3 and air flow of 1.5 L/min. Simultaneously, similar experiments were carried out with mixed microorganisms obtained removal efficiency of more than 80%. This result showed that microorganisms after being isolated gave higher performance than mixture of microorganisms. In particular, strain of B. thuringiensis could handle up to 3600 mg/Nm3 in inlet concentration at about 184.3 gphenolm-3.h-1 elimination capacity when removal efficiency was over 92%.

Evaluation of Two Upflow Anaerobic Digesters Purifying Industrial Wastewaters High in Organic Matter

1994 ◽  
Vol 29 (9) ◽  
pp. 225-229 ◽  
Author(s):  
Alan R. Howgrave-Graham ◽  
Helen A. Isherwood ◽  
F. Mike Wallis
Keyword(s):  
Pollutant Removal ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Feed Composition ◽  
Anaerobic Digesters ◽  
Start Up ◽  
Acetogenic Bacteria ◽  
Uasb Granules ◽  
Anaerobic Sludge Blanket ◽  
Microbial Morphotypes

Two full-scale anaerobic digesters, one a clarigester purifying a maize processing wastewater and the other with an upflow anaerobic sludge blanket (UASB) configuration treating brewery effluent, contained well settling, granular sludges efficient in pollutant removal. Due to differences in both digester design and feed composition, the sludges differed in activity and microbial population. The clarigester granules contained a diverse population with a multiformity of hydrolytic, acidogenic and acetogenic bacteria while the predominant methanogens, in order of significance, were Methanothrix and Methanosarcina. These granules did not reconstitute on re-start up following digester shutdown and possible reasons for this are discussed. The UASB granules contained a more uniform population with three major microbial morphotypes, the predominant methanogens being Methanothrix and, possibly, Methanobacterium. In this paper the differences in digester design, feed composition, sludge microbiology and process performance are discussed.

Search Engine, Inc.: Growth Versus Exit Strategy for a Mature Tech Start-Up

2018 ◽  
Vol 1 (2) ◽  
pp. 166-193
Author(s):  
Adora D. Holstein
Keyword(s):  
Search Engine ◽  
Private Equity ◽  
Synergistic Effects ◽  
Growth Strategy ◽  
Exit Strategy ◽  
Revenue Growth ◽  
Enterprise Search ◽  
Start Up ◽  
Search Market ◽  
To Come

This case is about an information technology start-up that has grown into a global tech company in 10 years with revenue growth of 35.4% from 2008 to 2011. However, during that same period, four major competitors were acquired by integrated search providers like Microsoft and Oracle. These firms integrate enterprise search into broader information services like data mining, analytic, and predictive services. This case enables students to role-play as a consulting team hired by Search Engine, Inc.’s Board to assess the company’s strengths and weaknesses relative to its changing competitive environment and to evaluate whether industry consolidation should be viewed as a threat to its long-term viability or as an opportunity for further growth. If the team recommends selling the company, it needs to identify a potential buyer who would benefit the most from synergistic effects of acquiring their technology, talents, and clients. If the team recommends a growth strategy, it has to specify whether the company should grow within the specialized search market or compete in the integrated search market and whether to finance such growth with private equity or with an IPO. Whether a growth or exit strategy is recommended, the team needs to come up with a fair market valuation.

Process Performance of a Biotrickling Filter Using a Flow-Directional-Switching Method

2013 ◽  
Vol 41 (6) ◽  
pp. 522-527 ◽  
Author(s):  
Liping Wang ◽  
Shilong He ◽  
Jiangcen Xu ◽  
Jie Li ◽  
Zhen Mao
Keyword(s):  
Biotrickling Filter ◽  
Process Performance ◽  
Switching Method

VOC removal and odor abatement by a low-cost plasma enhanced biotrickling filter process

2017 ◽  
Vol 5 (6) ◽  
pp. 5501-5511 ◽  
Author(s):  
Daniel Dobslaw ◽  
Andreas Schulz ◽  
Steffen Helbich ◽  
Christine Dobslaw ◽  
Karl-Heinrich Engesser
Keyword(s):  
Low Cost ◽  
Biotrickling Filter ◽  
Voc Removal ◽  
Odor Abatement ◽  
Filter Process
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