scholarly journals The Removal of Hydrogen Sulfide in the Biodesulfurization System Using Granulated Phosphogypsum

2016 ◽  
Vol 18 (1) ◽  
pp. 47 ◽  
Author(s):  
L.D. Plyatsuk ◽  
Ye.Yu. Chernysh
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfur Compounds ◽  
Gas Cleaning ◽  
Hydrogen Sulfide Removal ◽  
Support Medium ◽  
New Type ◽  
Sulfur Oxidizing ◽  
Biotechnological Processes ◽  
First Time

<p>This paper focuses on the study the possibility of phosphogypsum utilization in the biotechnological processes for hydrogen sulfide removal from biogas. The optimal parameters of the process of granulation dihydrate phosphogypsum were determined. The biochemical characteristics of granular carrier based on phosphogypsum was studied. The efficiency of the gas cleaning under immobilization of the thiobacillus on the surface support medium was analyzed. The main parameters of the gas cleaning process were determined. The degree of H<sub>2</sub>S removal from a gas stream was 98.22% at pH = 5.0 and optimum empty bed residence time of 10 h. The possibility of the phosphogypsum using as a new type of mineral support medium for the associations of sulfur-oxidizing microorganisms developing was determined in the process of biological gases purification from sulfur compounds. It was the first time both theoretically and experimentally proved that the mineral support on the basis of phosphogypsum has a sufficient micro and macro elements that necessary for the thiobacteria development. Thus it is eliminating the need to supply additional sources of feeding organisms to biofilter. The gas purification biotechnology with support medium using on the basis of phosphogypsum was developed. This technological solution which allows providing the high quality of gas stream purification with a high content of sulfur compounds, particularly hydrogen sulfide (more than 10% of the gas total volume).</p>

The potential for water hyacinth to improve the quality of Bogota River water in the Muña Reservoir: comparison with the performance of waste stabilization ponds

2002 ◽  
Vol 45 (1) ◽  
pp. 103-110 ◽  
Author(s):  
E. Giraldo ◽  
A. Garzón
Keyword(s):  
Water Quality ◽  
Hydrogen Sulfide ◽  
Water Hyacinth ◽  
Suspended Solids ◽  
Surface Loading ◽  
Waste Stabilization Ponds ◽  
Hydrogen Sulfide Removal ◽  
Waste Stabilization ◽  
Almost All

The potential application of Water Hyacinth (Eichhornia crassipes) in organic matter degradation, sedimentation, nutrient and heavy metal absorption and sulfur reduction in the Muña Reservoir has been tested in experimental lagoons. The lagoons were operated at hydraulic retention times (HRT) of 6, 9 and 15 days. One lagoon was covered with Water Hyacinth, which is naturally growing in the Muña Reservoir, while another lagoon was operated as a conventional oxidation pond. The Water Hyacinth lagoon had better removal efficiencies for almost all parameters measured: BOD5, total suspended solids, COD, nitrogen, phosphorus and heavy metals. The oxidation lagoon was facultative for HRT of 9 and 15 days, and anoxic when operated at 6 days HRT. At HRT of 15 days the water quality in the effluent of the covered lagoon corresponded to 12 mg/l of BOD, 6 mg/l of suspended solids and 0.8 mg/l of hydrogen sulfide. Hydrogen sulfide levels in the Muña reservoir can be substantially reduced at HRT higher than 15 days in both lagoons. The uncovered lagoon had better hydrogen sulfide removal during the day but presents high levels at night. If the hydraulic retention time in the Muña reservoir is increased, the water quality of the Bogota river can be substantially improved for all the HRTs tested in the pilot units. HRT seems to give a better prediction of overall effluent water quality than surface loading. More research is needed in order to define the optimum water hyacinth density in the Muña reservoir to determine its influence on the water quality of the effluent. The influence is expected to be negative due to an internal increase of BOD, solids, nutrients and metals loads due to plant decay.

scholarly journals HYDROGEN SULFIDE REMOVAL FROM BIOGAS BY SULFUR OXIDIZING BACTERIA UNDER MICROAEROPHILIC ENVIRONMENT IN THE ANAEROBIC DIGESTER

2009 ◽  
Vol 65 (2) ◽  
pp. 104-113 ◽  
Author(s):  
Takuro KOBAYASHI ◽  
Yu-You LI ◽  
Kengo KUBOTA ◽  
Hideki HARADA ◽  
Takeki MAEDA ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Anaerobic Digester ◽  
Sulfide Removal ◽  
Hydrogen Sulfide Removal ◽  
Sulfur Oxidizing ◽  
Sulfur Oxidizing Bacteria

Hydrogen sulfide removal from livestock biogas by a farm-scale bio-filter desulfurization system

2013 ◽  
Vol 67 (6) ◽  
pp. 1288-1293 ◽  
Author(s):  
J.-J. Su ◽  
Y.-C. Chang ◽  
Y.-J. Chen ◽  
K.-C. Chang ◽  
S.-Y. Lee
Keyword(s):  
Experimental Data ◽  
Power Generation ◽  
Hydrogen Sulfide ◽  
Removal Efficiency ◽  
Removal Rate ◽  
H2s Removal ◽  
Hydrogen Sulfide Removal ◽  
Farm Scale ◽  
Pig Farm ◽  
Sulfur Oxidizing

A farm-scale biogas desulfurization system was designed and tested for H2S removal efficiency from livestock biogas. This work assesses the H2S removal efficiency of a novel farm-scale biogas bio-desulfurization system (BBS) operated for 350 days on a 1,000-head pig farm. Experimental data demonstrated that suitable humidity and temperature can help sulfur-oxidizing bacteria to form active bio-films on the bio-carriers. The daily average removal rate increased to 879.16 from 337.75 g-H2S/d with an average inlet H2S concentration of 4,691 ± 1,532 mg/m3 in biogas. Thus, the overall (0–350 days) average H2S removal efficiency exceeded 93%. The proposed BBS overcomes limitations of H2S in biogas when utilizing pig farm biogas for power generation and other applications.

Communication Sciences and Disorders PhD Graduates' Perceptions of Their PhD Program

2020 ◽  
Vol 5 (2) ◽  
pp. 463-478
Author(s):  
Elizabeth Crais ◽  
Melody Harrison Savage
Keyword(s):  
Detailed Examination ◽  
Career Expectations ◽  
Doctoral Preparation ◽  
Creative Solutions ◽  
Phd Education ◽  
Doctor Of Philosophy ◽  
First Time ◽  
Students Success ◽  
Phd Program

Purpose The shortage of doctor of philosophy (PhD)–level applicants to fill academic and research positions in communication sciences and disorders (CSD) programs calls for a detailed examination of current CSD PhD educational practices and the generation of creative solutions. The intended purposes of the article are to encourage CSD faculty to examine their own PhD program practices and consider the perspectives of recent CSD PhD graduates in determining the need for possible modifications. Method The article describes the results of a survey of 240 CSD PhD graduates and their perceptions of the challenges and facilitators to completing a PhD degree; the quality of their preparation in research, teaching, and job readiness; and ways to improve PhD education. Results Two primary themes emerged from the data highlighting the need for “matchmaking.” The first time point of needed matchmaking is prior to entry among students, mentors, and expectations as well as between aspects of the program that can lead to students' success and graduation. The second important matchmaking need is between the actual PhD preparation and the realities of the graduates' career expectations, and those placed on graduates by their employers. Conclusions Within both themes, graduate's perspectives and suggestions to help guide future doctoral preparation are highlighted. The graduates' recommendations could be used by CSD PhD program faculty to enhance the quality of their program and the likelihood of student success and completion. Supplemental Material https://doi.org/10.23641/asha.11991480

Resveratrol: A new potential therapeutic agent for melanoma?

2019 ◽  
Vol 26 ◽  
Author(s):  
Mohamad Hossein Pourhanifeh ◽  
Kazem Abbaszadeh-Goudarzi ◽  
Mohammad Goodarzi ◽  
Sara G.M. Piccirillo ◽  
Alimohammad Shafiee ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Therapeutic Agent ◽  
Current Knowledge ◽  
Treatment Resistance ◽  
Anti Cancer ◽  
Apoptosis Inducer ◽  
Life Threatening ◽  
First Time

: Melanoma is the most life-threatening and aggressive class of skin malignancies. The incidence of melanoma has steadily increased. Metastatic melanoma is greatly resistant to standard anti-melanomatreatments such as chemotherapy, and 5-year survival rate of cases with melanoma who have metastatic form of disease is less than 10%. The contributing role of apoptosis, angiogenesis and autophagy in the pathophysiology of melanoma has been previously demonstrated. Thus, it is extremely urgent to search for complementary therapeutic approachesthat couldenhance the quality of life of subjects and reduce treatment resistance and adverse effects. Resveratrol, known as a polyphenol component present in grapes and some plants, has anti-cancer properties due to its function as an apoptosis inducer in tumor cells, and anti-angiogenic agent to prevent metastasis. However, more clinical trials should be conducted to prove resveratrol efficacy. : Herein, for first time, we summarize current knowledge of anti-cancerous activities of resveratrol in melanoma.

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