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All Journal JURNAL AIR INDONESIA Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Ilmiah Profesi Pendidikan BAHTRA: Jurnal Pendidikan Bahasan dan Sastra
A. Haris
Jurusan Kimia, Fakultas Sains dan Matematika Universitas Diponegoro
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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CORRELATION BETWEEN BIOMASS CONCENTRATION AND EXTENT OF SULPHATE REDUCTION IN AN ACIDOGENIC REACTOR Haris, A.; Pullammanappallil, P. C.; Keller, J.
Jurnal Air Indonesia Vol. 6 No. 1 (2010): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (203.716 KB) | DOI: 10.29122/jai.v6i1.2443

Abstract

Two stage high rate anaerobic treatment systems comprising of an acidogenic reactor (or equalisation/ buffer tank) followed by a methanogenic reactor are becoming increasingly popular to treat high strength wastewater from industries.  In these systems, sulphate present in the wastewater is reduced to sulphide either partially or completely in the acidogenic reactor and completely in the methanogenic reactor.  The effect of fermentation products on the extent of sulphate reduction in the acidogenic reactor was investigated in a continuously-fed, well mixed laboratory-scale 3 L fermenter operating at a temperature of 35oC and pH of 6.  The feed was based on either glucose or molasses as the carbon source.  It was observed that as the carbohydrate concentration in feed was increased sulphate reduction was suppressed.  It was confirmed that volatile organic acids like acetic, propionic and butyric acids, hydrogen and residual glucose did not cause inhibition of sulphate reduction.  However, biomass concentration correlated negatively with extent of sulphate reduction.  This correlation was expressed mathematically and the same expression with the same parameters adequately predicted the effect of biomass concentration on extent of sulphate removal for both steady state and transient data irrespective of glucose or molasses feed.  It was seen from the best fit of this expression that a biomass concentration of 3300 mg-COD.L-1 would completely repress sulphate reduction in the acidogenic reactor.  Even when sulphate removal was suppressed the presence of sulphate reducing bacteria (SRB) in the reactor was confirmed through Fluorescent In Situ Hybridisation (FISH) visualisation.  Moreover, the numbers of SRB seemed to increase with carbohydrate concentration in feed.  It was speculated the suppression of sulphate removal might be due to a switch in function of SRB from sulphate reducing to fermentation or acetogenesis.    Keywords: sulphate reducing bacteria, anaerobic digestion, inhibition, sulphate reduction, acidogenic reactor, high rate anaerobic treatment
CORRELATION BETWEEN BIOMASS CONCENTRATION AND EXTENT OF SULPHATE REDUCTION IN AN ACIDOGENIC REACTOR Haris, A.; Pullammanappallil, P. C.; Keller, J.
Jurnal Air Indonesia Vol. 6 No. 1 (2010): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jai.v6i1.2443

Abstract

Two stage high rate anaerobic treatment systems comprising of an acidogenic reactor (or equalisation/ buffer tank) followed by a methanogenic reactor are becoming increasingly popular to treat high strength wastewater from industries.  In these systems, sulphate present in the wastewater is reduced to sulphide either partially or completely in the acidogenic reactor and completely in the methanogenic reactor.  The effect of fermentation products on the extent of sulphate reduction in the acidogenic reactor was investigated in a continuously-fed, well mixed laboratory-scale 3 L fermenter operating at a temperature of 35oC and pH of 6.  The feed was based on either glucose or molasses as the carbon source.  It was observed that as the carbohydrate concentration in feed was increased sulphate reduction was suppressed.  It was confirmed that volatile organic acids like acetic, propionic and butyric acids, hydrogen and residual glucose did not cause inhibition of sulphate reduction.  However, biomass concentration correlated negatively with extent of sulphate reduction.  This correlation was expressed mathematically and the same expression with the same parameters adequately predicted the effect of biomass concentration on extent of sulphate removal for both steady state and transient data irrespective of glucose or molasses feed.  It was seen from the best fit of this expression that a biomass concentration of 3300 mg-COD.L-1 would completely repress sulphate reduction in the acidogenic reactor.  Even when sulphate removal was suppressed the presence of sulphate reducing bacteria (SRB) in the reactor was confirmed through Fluorescent In Situ Hybridisation (FISH) visualisation.  Moreover, the numbers of SRB seemed to increase with carbohydrate concentration in feed.  It was speculated the suppression of sulphate removal might be due to a switch in function of SRB from sulphate reducing to fermentation or acetogenesis.    Keywords: sulphate reducing bacteria, anaerobic digestion, inhibition, sulphate reduction, acidogenic reactor, high rate anaerobic treatment
EKSPLORASI NILAI-NILAI SOSIAL DALAM SASTRA LISAN MASYARAKAT DONGGO KABUPATEN BIMA Abimanyu, Dwi Yanto; Ikra, Ikra; Haris, A.
BAHTRA: Pendidikan Bahasa dan Sastra Vol 5, No 02 (2024): November 2024
Publisher : STKIP Harapan Bima

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56842/bahtra.v5i02.630

Abstract

This study aims to explore the social values embedded in the oral literature of the Donggo community, Bima Regency. The underlying issue of this research is the limited number of studies on how oral literature functions as a medium for transmitting social values within the Donggo indigenous community. Using a qualitative approach, this research employs a descriptive-analytical method with data collected through in-depth interviews and participatory observation. The data were thematically analyzed to identify key social values contained in the oral narratives. The findings indicate that Donggo oral literature is rich in social values, with cooperation, wise leadership, and social harmony emerging as dominant themes. The value of cooperation is reflected in 32% of the analyzed stories, while leadership and social harmony appeared in 24% and 20% respectively. These findings demonstrate that oral literature plays a crucial role in reinforcing social solidarity and maintaining order within the community. This study concludes that Donggo oral literature serves not only as entertainment but also as an instrument for preserving socially relevant values in the lives of the people. The results of this study can serve as a foundation for the preservation of oral traditions and the development of character education based on local culture.
Digital Based Literacy Learning Integration to Increase The Appreciation and Creativity of High School Students Farniati, Farniati; Arwan, Arwan; Haris, A.
Jurnal Ilmiah Profesi Pendidikan Vol. 10 No. 3 (2025): Agustus
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jipp.v10i3.3912

Abstract

This study aims to examine the effectiveness of digital-based literary learning in enhancing high school students’ literary appreciation and creativity. The background of the study lies in the low student interest in literary learning, which is often delivered using conventional methods with limited media integration. This research employed a mixed-methods approach with an embedded design, combining quantitative data from pretests and posttests with qualitative data from observations and interviews. The intervention was conducted over four sessions using digital platforms such as Canva and Padlet to support both literary appreciation and creative production. The paired sample t-test results showed a significant improvement between pretest and posttest scores, indicating the effectiveness of the digital approach. Moreover, qualitative findings revealed that students were more enthusiastic, expressive, and engaged throughout the learning process. In conclusion, digital literary learning is an innovative instructional approach that responds to the challenges of modern literacy and is highly recommended for broader implementation in secondary education.
Karakterisasi Struktur Bawah Permukaan Menggunakan Inversi Data Gravitasi di Cekungan Ombilin Fitria; Haris, A.; Rinaldo
Jurnal Penelitian Pendidikan IPA Vol 11 No 8 (2025): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i8.11762

Abstract

The Ombilin Basin in West Sumatra is one of the oldest intermontane basins in Indonesia that has significant geological potential, especially in relation to coal content and possible petroleum systems. This study uses a three-dimensional gravity inversion method to model the distribution of subsurface density from a depth of 0 to 6000 meters. The purpose of this study is to examine the subsurface geological modeling in the Ombilin Basin and to be a reference in exploration geophysical studies in other basins in Indonesia that have similar characteristics. Corrected regional gravity data are used as input in the inversion process to reconstruct the relative density model of rocks. The inversion results show a low-density zone (Δg between -0.1995 to -0.0099 gr/cc) in the central and southwest parts of the basin associated with sedimentary deposits such as sandstone, shale, and coal. At depths of more than 4000 meters, a high-density zone is identified that reflects the presence of basement rocks or possible magmatic intrusions. This density distribution strengthens the understanding of the basin geometry and potential hydrocarbon traps. This study shows that the gravity inversion method is an effective and economical approach for subsurface geological interpretation, especially in areas with limited exploration data.
Co-Authors Abimanyu, Dwi Yanto Arwan Arwan Farniati, Farniati Fitria Ikra, Ikra J. Keller Pullammanappallil, P. C. Rinaldo