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Maejo International Journal of Energy and Environmental Communication


The Maejo International Journal of Energy and Environmental Communication (MIJEEC) is a multi-disciplinary, blind peer-reviewed journal published under the School of Renewable Energy (SRE-MJU), covering all areas of energy and environment related fields that apply to the science and engineering communities. MIJEEC aims to promote rapid communication and dialogue among researchers, scientists, and engineers working in the areas of energy and environmental engineering. The journal provides a focus for activities concerning the development, and management of energy and environmental engineering related programs. It is hoped that this journal will prove to be an important factor in raising the standards of discussion, analyses, and evaluations relating to basic and applied science, agricultural application and energy and environment programs.

Latest articles

Journal Type : Original Article (Full Length Paper), Volume : 1, Issue : 3, Year : 2019, Pages : 55-63
Abstract: Three individuals of Bdelloid rotifer (J1, J2 and J3) were isolated from a MBR system in Nagasaki University and one individual of rotifer (J4) in the original seed sludge collected from a wastewater treatment plant for the MBR was isolated. The four rotifer species were able to proliferate in toxic Microcystis cell suspension. The partial sequence of 18S rRNA gene of each isolated rotifer was determined using In-fusion cloning and searched by BLAST. The gene of the four rotifers J1, J2, J3 and J4 showed the same sequence, then the consensus sequence was in the branch of Bdelloid rotifers in the phylogenetic tree. Furthermore, a specific Bdelloid forward primer 55F and reverse primer 395R for real-time PCR was designed based on the consensus sequence for quantitative researches on the Bdelloid rotifers population. We succeeded to quantify the population of a Bdelloid rotifer cultured in toxic Microcystis cell suspension using the new designed primer pairs.
Keyword(s): Rotifer 18S rRNA gene Specific primer In-fusion cloning Real-time PCR

Journal Type : Original Article (Full Length Paper), Volume : 1, Issue : 3, Year : 2019, Pages : 47-54
Abstract: We have focused on membrane vibration in MBR to find an effective design for the reduction of membrane fouling. In the previous study, we developed a direct measurement method for membrane vibration of a hollow fiber membrane (HFM) using an accelerometer (ACM). In this study, we studied on vibration characters on an HFM bundle in a practical membrane module in MBR using the ACMs in a large transparent water tank. Three ACMs were attached at the middle (P1), top (P2) and bottom (P3) position along a center line in the HFM bundle in which air was supplied from a diffuser below the membrane module with different aeration rates from 0 to 250 L/min. The acceleration of membrane vibration time series for the X-axis direction (left-right displacement) and Z-axis direction (back-front displacement) was recorded at three positions. The average vibration amplitudes of the acceleration along both directions at each position were increased as the aeration rate was increased. The HFM bundle showed a collective vibration with a frequency peak between 0 and 50 Hz. The Z-axis motion character of HFM bundle is regarded as a sheet vibration. The obtained vibration character was useful for the new design of a membrane module in MBR against the membrane fouling.
Keyword(s): MBR Membrane fouling Membrane vibration High-speed camera Accelerometer

Journal Type : Original Article (Full Length Paper), Volume : 1, Issue : 3, Year : 2019, Pages : 39-46
Abstract: Kandawgyi Lake is a famous recreational place in Yangon; however, the water quality deterioration and algae blooming occurred in recent years due to the economic development and people’s unawareness. In this study, the dynamic behaviors of water quality and mechanisms of eutrophication is investigated. During one-year field observation’s results showed that the lake’s water quality had been polluted by domestic wastewater depend on the high value of BOD and COD. Moreover, it was found that the thermal stratification exists about 1.0 meters water depth of the lake and anoxic water mass exists near the bottom of the lake. Besides, the one-year water depth observation showed the seasonal changes of water depth and, the water depth prediction by using the IOM mass balance model indicated better agreements in a dry season than a wet season. From the results of this study, it was thought that internal loading of nutrients could be the main reason of the algae blooms. Therefore, we proposed the bottom sediment removal as the most effective method to improve the water quality. Furthermore, small constructed wetlands at each inlet drains also can be an effective method as a countermeasure for the prevention of the next sediment accumulation.
Keyword(s): Eutrophication Thermal stratification Anoxic water mass IOM mass balance model Water depth changes

Journal Type : Original Article (Full Length Paper), Volume : 1, Issue : 3, Year : 2019, Pages : 32-38
Abstract: Recently, biogas production through anaerobic digestion technology has advanced massively. At the moment, caused by high energy demand and environmental concerns as the world’s population increases, the drive for anaerobic digestion processes is achievement drive within research and the industry for sustainable energy generation. The study evaluated biogas production from anaerobic mono-digestion of para grass in laboratory scale studies. In addition, improvement of the biogas yield from the grass via chemical pretreatment and leaching bed reactors was studied. Methane content of biogas was 54.36 % by mono- substrate. The results revealed that para grass can be treated anaerobically and are a good source of biogas.
Keyword(s): Green biomass Para grass Pretreatments Fermentation

Author(s) : Nobutaka Ito
Journal Type : Review Paper, Volume : 1, Issue : 3, Year : 2019, Pages : 27-31
Abstract: Many devices connected to the internet are able to generate valuable data that can help create technologically connected smart and green university campuses. These campuses can electronically monitor activities, including student attendance, security operations, campus lighting, and classroom usage that administrators, staff, and faculty members can use to make better decisions about how to operate more efficiently, effectively, and safely. University campuses have a responsibility not only to provide a quality education for students but also to provide a safe place to learn and operate with an appropriate allocation of resources applying with smart system with reasonable approaches.
Keyword(s): Smart campus Green campus Connected technologically Environmentally friendly

Journal Type : Original Article (Full Length Paper), Volume : 1, Issue : 3, Year : 2019, Pages : 20-26
Abstract: Pruning fruit trees is improving their full health and harvest. Fruit tree pruning leaves waste to represent an abundant amount of organic materials, and these produced during a short period. The basic fuel properties of lignocellulosic biomass from orchards were evaluated on the following fruit tree leaves obtained from pruning operations. Biomass has become a vital source of renewable energy. Biogas is one the renewable energy which can be produced by anaerobic fermentation of biomass. In this study, mango, longan and lychee trees pruning leaves waste was utilized for biogas production. These leaves were examined on proximate analysis and ultimate analysis contents are considered as carbon (C), hydrogen (H), oxygen (O), nitrogen (N) and sulfur (S). In this study, pretreatment was performed using a sodium hydroxide solution (w/v) at different concentrations as above (1, 2, 3, and 4%). For the best feedstock screening, the theoretical biochemical methane potential was confirmed. Mango leaves biomethane content was higher compared to longan and lychee leaves. Finally, this biomass was suggested further large-scale studies. Digestate from biogas system is a highly valuable nutrient and rich fertilizer.
Keyword(s): Mango leaves Longan leaves Lychee leaves Pruning leaves Biomass source Biogas production

Journal Type : Original Article (Full Length Paper), Volume : 1, Issue : 3, Year : 2019, Pages : 9-19
Abstract: In this investigation microalgae Chlorella sp. were isolated and identified from the industrial wastewater. Microalgae species was mass cultivated by using BG11 medium. After 30 days, mixture of Chlorella with different wastewater A, B, C, D, E and F with different ration of Chlorella: wastewater which were 1:6, 1:1, and 2:1. Incubated at room temperature at illuminated area. Dissolved oxygen, TDS, salinity, pH, optical density, oxygen saturation and conductivity were measured for day 0, 10, 20 and 30. For microalgae in wastewater A and C, value of pH, salinity, dissolved oxygen, oxygen saturation, conductivity, salinity and TDS did not change while absorbance value decreased from day 0 to day 30. For wastewater B, D, E and F, the absorbance and pH value increase for all concentration from day 0 to day 30. The highest oxygen saturation after 30 days for wastewater B, D, E and F was at concentration 1:6, 2:1 and 1:1 respectively. The highest dissolved oxygen for wastewater B, D and E was at concentration 1:1 and F was at 2:1. The lowest conductivity, salinity and TDS for wastewater B, C, D and F were all at the concentration of 2:1. The result showed that, Chlorella managed to reduce the salinity for wastewater B, C, D and F, at concentration of 2:1 which were 3.67 %, 4.53 %, 5.4 % and 4.91 % respectively.
Keyword(s): Microalgae Chlorella sp. Industrial waste water Salinity reduction TDS

Journal Type : Original Article (Full Length Paper), Volume : 1, Issue : 3, Year : 2019, Pages : 1-8
Abstract: Coconut pulp residues waste generated after extraction of milk or oil. These wastes end up as feed to animals, fertilizers and firewood/cooking fuel whilst large quantities often left to rot in the field, which causes cause pollution, waste disposal problems and increase handling cost for farmers. In order to alleviate this problem, coconut pulp residue was used as feedstock for bioethanol production. However, improvements on pretreatment are necessary to produce higher sugar concentration prior to fermentation. Bioethanol production from coconut pure pulp residue (PPR) and combined pulp residue (CPRS) was investigated. The results showing 40 minutes’ pre-hydrothermal treatment time and 2% mild sulphuric acid for PPR and 20 minutes’ hydrothermal treatment time and 2% mild sulphuric acid for CPRS.
Keyword(s): Coconut pulp residues Sequential pretreatment Enzyme hydrolysis Bioethanol Production

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