PEMBENIHAN DAN AKLIMATISASI PADA SISTEM ANAEROBIK

2018 ◽  
Vol 6 (2) ◽  
Author(s):  
Indriyati Indriyati
Keyword(s):  
Growth Rate ◽  
Total Population ◽  
Fixed Bed ◽  
Support Material ◽  
Anaerobic Process ◽  
Anaerobic Reactor

Seeding in Fixed Bed anaerobic reactor are infl uenced by several condition such as the growth rate total population of microbial, bacterial adaption to infl uent and the retention of biomass in reactor. The aim of this observation is to fi nd out the seeding and acclimation process in anaerobic process by using plastic as support material. Seeding and acclimatization process run smoothly can be seen from the increasing of infl uent or substrate and following by the increasing degradation of soluble COD, beside that the decreasing of VSS concentration indicates that microorganism are all ready fi x in support material, therefore reactor can be operated continuously and the acclimatization process can be stopped.Keywords : anaerobic seeding, acclimation anaerobic process

scholarly journals Anaerobic Degradation of Individual Components from 5-Hydroxymethylfurfural Process-Wastewater in Continuously Operated Fixed Bed Reactors

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 677
Author(s):  
Muhammad Tahir Khan ◽  
Johannes Krümpel ◽  
Dominik Wüst ◽  
Andreas Lemmer
Keyword(s):  
Levulinic Acid ◽  
Anaerobic Degradation ◽  
Fixed Bed ◽  
Methane Yield ◽  
Process Stability ◽  
Anaerobic Process ◽  
Anaerobic Filter ◽  
Fixed Bed Reactors ◽  
Process Wastewater ◽  
By Products

Production of bio-based materials in biorefineries is coupled with the generation of organic-rich process-wastewater that requires further management. Anaerobic technologies can be employed as a tool for the rectification of such hazardous by-products. Therefore, 5-hydroxymethylfurfural process-wastewater and its components were investigated for their biodegradability in a continuous anaerobic process. The test components included 5-hydroxymethylfurfural, furfural, levulinic acid, and the full process-wastewater. Each component was injected individually into a continuously operating anaerobic filter at a concentration of 0.5 gCOD. On the basis of large discrepancies within the replicates for each component, we classified their degradation into the categories of “delayed”, “retarded”, and “inhibitory”. Inhibitory represented the replicates for all the test components that hampered the process. For the retarded degradation, their mean methane yield per 0.5 gCOD was between 21.31 ± 13.04 mL and 28.98 ± 25.38 mL. Delayed digestion was considered adequate for further assessments in which the order of conversion to methane according to specific methane yield for each component from highest to lowest was as follows: levulinic acid > furfural > 5-hydroxymethylfurfural > process-wastewater. Disparities and inconsistencies in the degradation of process-wastewater and its components can compromise process stability as a whole. Hence, the provision of energy with such feedstock is questionable.

scholarly journals Co-digestion of Oil Palm Trunk Hydrolysate and Slaughterhouse Wastewater for Biohydrogen Production in a Fixed Bed Reactor by Immobilized Thermoanaerobacterium thermosaccharolyticum KKU19 on Expanded Clay

2021 ◽  
Vol 9 ◽  
Author(s):  
Sontaya Khamtib ◽  
Sureewan Sittijunda ◽  
Tsuyoshi Imai ◽  
Alissara Reungsang
Keyword(s):  
Oil Palm ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Hydrogen Yield ◽  
Support Material ◽  
Slaughterhouse Wastewater ◽  
Term Operation ◽  
Oil Palm Trunk ◽  
Thermoanaerobacterium Thermosaccharolyticum

The goal of this study was to evaluate the use of expanded clay as a support material for Thermoanaerobacterium thermosaccharolyticum KKU19 to produce hydrogen from oil palm trunk hydrolysate (OPT) and slaughterhouse wastewater (SHW) in a fixed-bed reactor (FBR) under non-sterile conditions. The effects of hydraulic retention time (HRT) on the performance of the FBR were also investigated. The FBR was operated at an OPT hydrolysate to SHW ratio of 2.55:1 (v:v), 60°C, initial pH 6.5, and 1.2 mg (as total volatile solids/g expanded clay) of T. thermosaccharolyticum KKU19 immobilized on expanded clay. A maximum hydrogen production rate (HPR) and hydrogen yield (HY) of 7.15 ± 0.22 L/L day and 234.45 ± 5.14 mL H2/g-COD, respectively, were obtained at an HRT of 6 h. Long-term operation of FBR at 6 h HRT indicated that expanded clay efficiently immobilizes T. thermosaccharolyticum KKU19, for which an HPR of 6.82 ± 0.56 L H2/L day, and an HY of 231.99 ± 19.59 mL H2/g-COD were obtained. Furthermore, the COD removal efficiency of 30% obtained under long-term operation was comparable to that under short-term operation at an HRT of 6 days. Butyric and acetic acids were the main soluble metabolite products, thereby indicating a butyrate–acetate type fermentation. Our findings indicate that expanded clay is an effective support material that contributes to the protection of microbial cells and can be used for long-term operation.

scholarly journals Characterization of the biomass of a hybrid anaerobic reactor (HAR) with two types of support material during the treatment of the coffee wastewater

2013 ◽  
Vol 56 (3) ◽  
pp. 495-504 ◽  
Author(s):  
Vivian Galdino da Silva ◽  
Cláudio Milton Montenegro Campos ◽  
Erlon Lopes Pereira ◽  
Júlia Ferreira da Silva
Keyword(s):  
Support Material ◽  
Anaerobic Reactor

scholarly journals Psychiatry in Iran

2005 ◽  
Vol 2 (10) ◽  
pp. 10-12 ◽  
Author(s):  
Majid Sadeghi ◽  
Gholamreza Mirsepassi
Keyword(s):  
Growth Rate ◽  
Rural Areas ◽  
Persian Gulf ◽  
Population Growth Rate ◽  
Total Population ◽  
Islamic Republic ◽  
Land Area ◽  
The Caspian Sea ◽  
Islamic Republic Of Iran ◽  
The Persian Gulf

The Islamic Republic of Iran is located in the Middle East between the Caspian Sea and the Persian Gulf. Iran's total land area is 1 648 000 km2. Its total population in 2003 was about 68 920 000 (UNICEF, 2003). The population growth rate is 1.41%. Of the total population, 60.4% live in urban and 39.6% in rural areas (Yasamy et al, 2001).

Influence of porosity and composition of supports on the methanogenic biofilm characteristics developed in a fixed bed anaerobic reactor

2001 ◽  
Vol 44 (4) ◽  
pp. 197-204 ◽  
Author(s):  
A. P. Picanço ◽  
M. V.G. Vallero ◽  
E. P. Gianotti ◽  
M. Zaiat ◽  
C. E. Blundi
Keyword(s):  
Polyurethane Foam ◽  
Fixed Bed ◽  
Microscopic Analysis ◽  
Synthetic Wastewater ◽  
Refractory Brick ◽  
Anaerobic Reactor ◽  
Support Materials ◽  
Anaerobic Biomass ◽  
Biofilm Development ◽  
Material Porosity

This paper reports on the influence of the material porosity on the anaerobic biomass adhesion on four different inert matrices: polyurethane foam, PVC, refractory brick and special ceramic. The biofilm development was performed in a fixed-bed anaerobic reactor containing all the support materials and fed with a synthetic wastewater containing protein, lipids and carbohydrates. The data obtained from microscopic analysis and kinetic assays indicated that the material porosity has a crucial importance in the retention of the anaerobic biomass. The polyurethane foam particles and the special ceramic were found to present better retentive properties than the PVC and the refractory brick. The large specific surface area, directly related to material porosity, is fundamental to provide a large amount of attached biomass. However, different supports can provide specific conditions for the adherence of distinct microorganism types. The microbiological exams revealed a distinction in the support colonization. A predominance of methanogenic archaeas resembling Methanosaeta was observed both in the refractory brick and the special ceramic. Methanosarcina-like microorganisms were predominant in the PVC and the polyurethane foam matrices.

scholarly journals Agricultural land use and Population growths in Nigeria: The Need for synergy for a Sustainable Agricultural Production

2021 ◽  
Vol 61 (3) ◽  
Author(s):  
Sunday Brownson Akpan ◽  
Victor O. Ebong
Keyword(s):  
Land Use ◽  
Growth Rate ◽  
Population Growth ◽  
Rural Population ◽  
Total Population ◽  
Agricultural Land ◽  
Arable Land ◽  
Agricultural Land Use ◽  
Land Utilization ◽  
Near Future

The study examined the relationship between agricultural land use and population growth rates from 1961 to 2018 in Nigeria. Secondary data were obtained from Food and Agricultural Organization and the World Bank. Descriptive statistics, trend equation and correlation analyses were used. Findings revealed that agricultural and arable land utilization grew at the rate of 0.62% and 0.72%, respectively per annum; while the total population growth rate stood at 2.57%. Also, urban and rural population grew at a rate of 4.75% and 1.67% respectively. In addition, the agricultural and arable land utilization rates had significant positive correlations with the total population, urban and rural population. Besides, the findings revealed that, agricultural land (to total land ratio) has continued to increase and currently averaged at 68.78% indicating massive land expansion put under agricultural used. Findings revealed that, most arable crop outputs increase majorly from land expansion rather than land productivity, a situation that cannot assure sustainable agricultural land use food security in a near future. Hence, the country needs agricultural land sparing policies and technologies to slow the current agricultural land expansion drive. Besides, the country’s agricultural land policies should focus on achieving land productivity and sustainable land-sharing strategies among major land users in the country. Again, the rural population growth rate is lower than the urban growth rate, implying that, the rural population is deteriorating with its probable negative effect on farm labour. This needs to be addressed urgently if the sustainable agricultural system is to be achieved in the near future in Nigeria.

scholarly journals Psychiatry in Bangladesh

2006 ◽  
Vol 3 (3) ◽  
pp. 16-18 ◽  
Author(s):  
M. Rezaul Karim ◽  
Fakhruzzaman Shaheed ◽  
Siddhartha Paul
Keyword(s):  
Growth Rate ◽  
Population Growth ◽  
South Asia ◽  
Rural Areas ◽  
Urban Areas ◽  
Population Growth Rate ◽  
Total Population ◽  
Land Area

The People's Republic of Bangladesh is located in South Asia. The total land area of Bangladesh is 147570 km2. Its total population in 2001 was about 123 million. The population growth rate is 1.47%; of the total population, 75% live in rural areas and 25% in urban areas (Bangladesh Bureau of Statistics, 2000).

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