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All Journal Journal of Science Education Research Nusantara Science and Technology Proceedings
Hidayah, E. N.
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Economics, Econometrics & Finance Education Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Social Sciences

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Effect of Preoxidant on The Changing of Low Molecular Weight of Natural Organic Matter Hidayah, E. N.; A. T. Agripina; O. H. Cahyonugroho
Nusantara Science and Technology Proceedings International Seminar of Research Month Science and Technology for People Empowerment.
Publisher : Future Science

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Abstract

Natural organic matter (NOM) is a complex organic compound that have been exist in water sources. The presence of NOM in water, especially the aromatic compound, could trigger the formation of disinfectant by-products (DBPs). Low molecular weight of NOM, one of the characterisctic of organic based on their molecular weight, is quite difficult to be removed in coagulation process. Preoxidation is one the effort to reduce carbon structure of organic matter and it has been known as pretreatment before coagulation process and advanced ones. The objective of this research is to track the changing of low molecular weight of NOM through preoxidation with pottasium permanganaate (KMnO4). Low molecular weight of NOM is presented by synapic acid. Detection of NOM properties was observed quantitatively by using total organic carbon (TOC) and qualitatively by using fourier transform infrared (FTIR). The results shown that KMnO4 could increase the concentration of TOC. According to FTIR analysis, the increasing of TOC concentration is proably due to the transformation of low organic matter into lower organic compound. FTIR showed the increasing of % transmitance of all functional groups of organic matter.
Effect of Coagulant to Enhance Floatation Performance in Removing Organic and Grease Hidayah, E. N.; A. Amalia; R. K. H. Putro; D. Putranto
Nusantara Science and Technology Proceedings International Seminar of Research Month Science and Technology for People Empowerment.
Publisher : Future Science

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Industrial wastewater treatment has been facing in high concentration of pollutant issues. One of the parameters issues is fat, oil, and grease (FOG) concentration. These parameters is needed to be considered since it will affect biological processes. Floatation is widely used processes in removing fat, oil, and grease in wastewater treatment processes. Recently, high concentration of oil, fat, and grease instead of suspended solid could decrease the performance of floatation. Therefore, it is necessary to enhance floatation performance. The objective of this research is to enhance floatation performance through coagulation by using various coagulant. Alum, FeCl3, and polyaluminium chloride (PAC) under various dosage was used as coagulant before flotation processes. The results shown that 20 mg/L PAC has high performance in removing FOG 230 mg/L into 20 mg/L or 91.3% FOG removal, and COD 1152 mg/L was treated into 230 mg/L or 80% COD removal.
Analysis of Pre-service Science Teachers' Technological Pedagogical Content Knowledge (TPACK) Khasanah, A. N.; Septiyanto, A.; Jumadi, J.; Wilujeng, I.; Hidayah, E. N.
Journal of Science Education Research Vol 9, No 1 (2025): J. Sc. Edu. Research
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jser.v9i1.72907

Abstract

Professional teachers are expected to be able to integrate TPACK into their learning to meet the demands of changing science and technology in the world of education. This study examined the TPACK used by pre-service science teachers, as evidenced by the direct application of preschool field introductions in Indonesia called PLP. The study was a mixed method study using an Explanatory Sequential Design approach. The quantitative data collection instrument employed a survey method for pre-service science teachers participating in PLP. Technical triangulation was used in qualitative data collection instruments, such as observations, interviews, and documents. Data analysis Techniques used descriptive quantitative and qualitative data. The quantitative results showed that the TCK (3.50) and TK (3.43) domains were in the high category, followed by CK (3.24), PK (3.21), TPK (3.17), PCK (3.15), dan TPACK (3.10) in the moderate category. Qualitative evidence suggests that pre-service science teachers used the seven TPACK domains in their learning during PLP, as evidenced by observation, interviews, and documentation. The research has implications for studying longitudinal conducting to track the development of TPACK competencies over time, providing insights into how these skills evolve from training through to professional teaching.
Co-Authors A. Amalia A. N. Khasanah, A. N. A. T. Agripina D. Putranto I. Wilujeng, I. Jumadi, J. O. H. Cahyonugroho R. K. H. Putro Septiyanto, A.