Pelletization of Iron Oxide Based Sorbents for Hydrogen Sulfide Removal

2017 ◽  
Vol 751 ◽  
pp. 449-454 ◽  
Author(s):  
Pathompong Janetaisong ◽  
Viset Lailuck ◽  
Somsak Supasitmongkol
Keyword(s):  
Hydrogen Sulfide ◽  
Iron Oxide ◽  
Iron Oxides ◽  
Sorption Capacity ◽  
Flow Rate ◽  
Large Scale ◽  
Gas Adsorption ◽  
Positive Impact ◽  
Engine Performance ◽  
Hydrogen Sulfide Removal

Biogas derived from anaerobic digestion of biological wastes has been extensively used for heating purposes and/or electricity generation. Presence of hydrogen sulfide (H2S) in biogas affects engine performance adversely, thus reducing H2S content is a valuable part in practical application before utilizing biogas. Adsorptive separation is very appealing due to being an economical and effective method including the use of iron oxide based adsorbents. Pelletization of iron oxide adsorbents has never been reported among the adsorbents described to date. Therefore, H2S capture in two iron oxides (ferric oxide (Fe2O3) and magnetite (Fe3O4)) was experimentally investigated to determine technical feasibility of shaping pellets based on active iron oxide sorbent in removing H2S from a simulated gas stream (0.35 vol.% H2S balanced in N2). Many factors affecting the behavior of gas adsorption such as gas in-flow rate, adsorption temperature, binder loadings and textural characteristics were considered. The pellet strengths were also undertaken using a bulk crushing strength analyzer. The results indicated that higher temperature favors the diffusion of H2S molecules from the surface into the bulk of iron oxides. The H2S-sorption capacity of Fe3O4 sorbent was higher than that of Fe2O3 sorbent corresponding with the different pore volume and surface area in each adsorbent. With the same active Fe3O4, the extruded pellet produced with starch binder showed the excellent H2S uptake and crushing resistance. The higher gas in-flow rate had positive impact to contacting efficiency and mass transfer of solid and gas phase. The adsorbed H2S gas can be readily desorbed from the pellets with the desorption temperature below 60°C and the H2S-sorption capacity was consistent over repeated cycles. The pellets can be reused several times for consecutive adsorption/desorption cycles, without loss of performance in a large-scale reactor and therefore represent serious candidates for use in commercial absorbers.

scholarly journals Continuous High-Flow System to Trap and Separate Magnetic Particles from Liquid Mixtures

2018 ◽  
Author(s):  
Georgios Banis ◽  
Maria Elisavet Kouli ◽  
Evangelos Hristoforou ◽  
Angelo Ferraro
Keyword(s):  
Iron Oxide ◽  
Flow Rate ◽  
Large Scale ◽  
Magnetic Particles ◽  
Flow System ◽  
Scaling Up ◽  
Liquid Solution ◽  
Liquid Mixtures ◽  
Separation Process ◽  
High Flow

Bio-separation of natural molecules as well as clinical compounds has been constantly developed in last decades. Several techniques are available but the majority of them presents drawbacks such us impossibility to be applied for industrial purposes. The main limitations for the scaling up are high costs and the fact that the devices work with microfluid dynamics. Nevertheless, magnetic bio-separation is considered the most prone to be used for large scale applications. Herein, we propose a simple magnetic separation method that is not based on microfluid dynamics, can work in a continuous- and high-flow rate and can be easily automated in order to be used for standard separation purposes. It is based on the use of an anisotropic flexible ferric magnetic strip, Teflon hoses and a pumping device. We show the modelling of the separation process along with an experimental test on iron oxide magnetic particles. The results showed that it is possible to remove, and separately collect, more than 92% of magnetic particles from a liquid solution of 100 ml in roughly 15 minutes.

Effect of Surface Properties of Iron Oxide Sorbents on Hydrogen Sulfide Removal from Odor

2015 ◽  
Vol 43 (7) ◽  
pp. 975-979 ◽  
Author(s):  
Danlin Zeng ◽  
Shenglan Liu ◽  
Wanjun Gong ◽  
Guanghui Wang ◽  
Jianghua Qiu ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Iron Oxide ◽  
Surface Properties ◽  
Sulfide Removal ◽  
Hydrogen Sulfide Removal ◽  
Effect Of Surface

Hydrogen Sulfide Removal by Iron Oxide-Based Clay from Biogas for Community Use

2019 ◽  
Vol 886 ◽  
pp. 159-165
Author(s):  
Chedsada Mingchai ◽  
Sriprai Sakunphun ◽  
Suttirat Palas ◽  
Soiratda Samposree
Keyword(s):  
Hydrogen Sulfide ◽  
Iron Oxide ◽  
Local Community ◽  
Rubber Tree ◽  
Medium Size ◽  
Security Level ◽  
Hydrogen Sulfide Removal ◽  
Randomized Design ◽  
Groundwater Supply ◽  
Completely Randomized Design

The purpose of this study was to absorb the hydrogen sulfide (H2S) produced by biogas system for local community six absorbents, namely activated carbon, shredded rusty iron and iron oxide-based clay with 4 different size distributions that were tested by employing Completely Randomized Design (CRD). The results showed that iron oxide-based clay from a groundwater supply with smallest size (8.73 mm in diameter) was the most effective absorbent in removing the H2S judging by security level of biogas users and security level of the engine of 368 and 406 minutes, respectively. However, the security level of the engine of the smallest iron oxide was not significantly different from that of medium size (12 mm in diameter) in 325 minutes. For the durability of absorbent determined from H2S was less than 500 ppm, the iron oxide with the smallest size was also effective with the best removal (506 minutes) but was not significantly different from those of the medium size (491 minutes) and the mixed size (435 minutes). Therefore, the smallest iron oxide-based clay was selected for the technology transfer to rubber tree farmers and fishermen in the south of Thailand.

Effect of Microwave Heating Variables on Nitrogen-Enriched Palm Shell Activated Carbon toward Efficient Hydrogen Sulfide Removal

2018 ◽  
Vol 280 ◽  
pp. 315-322
Author(s):  
N. Mohammad Nor ◽  
L. L. Chung ◽  
Bassim H. Hameed ◽  
S. Sethupathi ◽  
A. R. Mohamed
Keyword(s):  
Hydrogen Sulfide ◽  
Activated Carbon ◽  
Microwave Heating ◽  
Flow Rate ◽  
Heating Temperature ◽  
Research Work ◽  
Heating Time ◽  
Operating Parameters ◽  
Palm Shell ◽  
Hydrogen Sulfide Removal

This research work is focuses on understanding the characteristics of modified nitrogen-enriched palm shell activated carbon (N-PSAC) that undergo different microwave (MW) operating parameters towards efficient H2S removal. The nitrogen functional groups were tailored onto PSAC micropore structures through impregnation of urea onto palm shell activated carbon (PSAC). The effect of MW heating variables (heating temperature, N2 flow rate, heating time and amount of adsorbent) on N-PSAC adsorbent was investigated and analyzed with respect to H2S adsorption capacity.One factor at a time (OFAT) approach was used to produce an efficient N-PSAC adsorbent, where theH2S breakthrough capacity (measured at 5% of H2S outlet concentration) attained was in the range of 98.71 – 211.35 mg/g.It was found that MW heating variables contribute a significant impactto the modification of N-PSAC adsorbent in catering the H2S emission.

Mesoporous SBA-15 Supported Iron Oxide: A Potent Catalyst for Hydrogen Sulfide Removal

2008 ◽  
Vol 193 (1-4) ◽  
pp. 247-257 ◽  
Author(s):  
Xiaohui Wang ◽  
Jinping Jia ◽  
Ling Zhao ◽  
Tonghua Sun
Keyword(s):  
Hydrogen Sulfide ◽  
Iron Oxide ◽  
Sulfide Removal ◽  
Hydrogen Sulfide Removal ◽  
Supported Iron

Knowledge and awareness about MERS-CoV among the dental students in Chennai

2020 ◽  
Vol 11 (SPL1) ◽  
pp. 847-851
Author(s):  
Nithyanandham Masilamani ◽  
Dhanraj Ganapathy
Keyword(s):  
College Students ◽  
Large Scale ◽  
Preventive Measures ◽  
Positive Impact ◽  
Educational Programs ◽  
Dental Students ◽  
Professional Organizations ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Mode Of Transmission

Middle East Respiratory Syndrome (MERS) induced by new ß coronavirus MERS-(CoV) had first been described in Saudi Arabia in September 2012. MERS-CoV communication inside the population is often identified with clustered households and cramped communal spaces. The purpose of the study is to assess the knowledge and awareness of MERS-CoV among dental students in India. This was a questionnaire-based cross-sectional survey of 100 dental college students in Chennai. The self-designed questionnaires contained ten questions focused on the knowledge and awareness of MERS-CoV amongst dental college students. Questionnaires were circulated through an online website survey planet. After the responses were received from 100 participants, data were collected and analyzed, .87% are aware of MERS-CoV through media 13% from professional channels. 84%are aware of the clinical manifestation of MERS-CoV. 81%Are aware of the mode of transmission of MERS-CoV. 76%are aware of the preventive measures against MERS -CoV.68%. Are aware of the incubation period of MERS-CoV. 74%aware of PCR as a diagnostic test for MERS-CoV. This study concluded that dental students had strong awareness and knowledge of MERS. Also, there are a few differences in information and behaviours that require change. Large-scale health educational programs on MERS also should be facilitated by professional organizations to expand their reach and to strengthen knowledge to have a positive impact on their behaviour.

Accidental Sustainability

2017 ◽  
Author(s):  
Geoffrey Jones
Keyword(s):  
Large Scale ◽  
Negative Impact ◽  
Positive Impact ◽  
Organic Food ◽  
The United States ◽  
Air Travel ◽  
Business Leaders ◽  
Natural Beauty ◽  
And Diffusion ◽  
Whole Foods

This chapter examines the scaling and diffusion of green entrepreneurship between 1980 and the present. It explores how entrepreneurs and business leaders promoted the idea that business and sustainability were compatible. It then examines the rapid growth of organic foods, natural beauty, ecological architecture, and eco-tourism. Green firms sometimes grew to a large scale, such as the retailer Whole Foods Market in the United States. The chapter explores how greater mainstreaming of these businesses resulted in a new set of challenges arising from scaling. Organic food was now transported across large distances causing a negative impact on carbon emissions. More eco-tourism resulted in more air travel and bigger airports. In other industries scaling had a more positive impact. Towns were major polluters, so more ecological buildings had a positive impact.

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