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All Journal Journal of Applied Chemical Science Chemistry Indonesian Journal of Chemical Research Chemical Engineering Journal Storage (CEJS) Chemistry Notes
Bibiana D. Tawa
Department of Chemistry Faculty of Science and Engineering, Nusa Cendana University
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science

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PEMANFAATAN BATU KARANG-PASIR DALAM PROSES PENGOLAHAN GREYWATER Weking, Maria Y. T.; Tawa, Bibiana D.; Ledoh, Sherlly M. F.; Gauru, Imanuel
Chemistry Notes Vol 1 No 1 (2018): Chem. Notes 2018, 1(1)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v1i1.1573

Abstract

A study of Greywater treatment has been conducted. By utilising vast local coral reefs and sand as filter media, we aimed to treat synthetic waste water in term of reducing its pH, temperature, COD, phosphates and turbidity parameter. The sample was passed gravitationally through 3 variation of filtering agent composition i.e. 1:1, 2:1 and 1:2 of coral reefs to sand ratio respectively in 2 flow rates: 0,4 and 0,8 mL/s. The collected up flow effluent was then analysed. Data resulted were then tested with ANOVA statistical test. The result showed that the mass ratio of the media and the flow rate influenced parameters. The best treatment was obtained at the 1:1 mass ratio in 0,4 mL/s flow rate. The effluent fulfilled the Indonesian water standard quality according to PP No 82 tahun 2001 and PERMENKES No 416/MENKES/PER/1990.
PEMANFAATAN ABU LAYANG (FLY ASH) SEBAGAI ADSORBEN PADA MINYAK JELANTAH Wogo, Hermania Em; Bokay, Ernawati A.; Tawa, Bibiana D.; Ledoh, Sherlly M. F.
Chemistry Notes Vol 2 No 2 (2020): Chem. Notes 2020, 2(2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v2i2.3279

Abstract

A research on the conducted on the use of fly ash as an adsorbent in used cooking oil. This research was conducted with the aim to know the characteristics of fly ash without activation and activation with 6M HCl and to improve the quality of used cooking oil from adsorbent processing based on the Indonesian national standard (SNI). This research was conducted in several stages, namely surface acidity with the titration method, determination of surface area with the blue methylene method, determination of functional groups by FTIR analysis and oil quality based on parameters of acid number, peroxide number and smoke point. The results showed that the acidity of the surface of the fly ash was activated and without activation of 4 and 3.6 m2 / g respectively. surface area of ​​fly ash without activation 17,480 m2/g at contact time 80 and activated fly ash 18,471 m2/g at contact time 70. FTIR spectra of fly ash without activation 795,38 and 779.95 cm-1 and activated 795.38 and 778,02 cm-1 which is a symmetrical stretching adsorption band of symmetric ≡Si-O (≡Si-O-Si≡). Fly ash used for refining used cooking oil (2,468 mg KOH / g) is able to reduce the acid number 0.361 mg KOH / g in activated fly ash and 0.561 mg KOH / g for fly ash without activation, the peroxide number for activated fly ash decreased by 72.34% compared to fly ash without activation 69.14%, oil smoke point purification results from activated fly ash 203ºC and without activation 210ºC which is close to the new oil smoke point value of 200ºC. When compared with SNI, the values ​​of acid numbers, peroxide numbers and smoke points meet the standard.
PENGARUH KOMPOSISI BIOAKTIVATOR KOTORAN SAPI DAN DAUN GAMAL (GLIRICIDIA SEPIUM) DENGAN NUTRISI UBI JALAR TERHADAP KUALITAS KOMPOS Tawa, Bibiana D.; Tnunay, Yarni R.; Suwari, Suwari; Nitbani, Febri O.
Chemistry Notes Vol 2 No 2 (2020): Chem. Notes 2020, 2(2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v2i2.3362

Abstract

A research conducted about effect of bioaktivator of cow feces and gamal (gliricidiasepium) leaves with sweet potato nutrition toward the compost quality. This research hadpurpose to know the compost characteristics of cow`s dung composition and gamal. Thecharacteristic determined to 60% of cow`s dung and 40% gamal leaves used purple sweetpotatoes nutrition and water that made constant. The variation of cow`s dung and gamal leaveswas 90%: 10%, 50%: 50%, 30%: 70%. The research result show that in the 14th days therewere compost characteristics to produce compost based on SNI 19-7030-2004 andrequirements of the minister of agriculture number 70/Permentan/SR.140/10/2011. Thevariations of cow`s dung and gamal leaves did not effect towards C/N ratio compost.
Pengaruh Komposisi Daun Gamal (Gliricidia sepium Hbr.) dan Kotoran Sapi dengan Nutrisi Pisang terhadap Rasio C/N Kompos Sedo, Karolina M.; Tawa, Bibiana Dho; Lulan, Theodore Y. K.; Gauru, Imanuel; Cunha, Theodorus M. Da
Chemistry Notes Vol 3 No 2 (2021): Chem. Notes 2021, 3(2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v3i2.6089

Abstract

It has been done a research on the effect of the composition of gliricidia sepium Hbr. And cow dung with banana nutrition on the composting process on the C/N ratio. This research was conducted with the aim of knowing the effect of the composition and the length of time required for fermentation. Composting was made with a variety of cow dung : gliricidia sepium Hbr. In a ratio of 1:9, 1:1, 3:2, 7:3, 9:1, and 2:3 in % by using 25% banana nutrition and 100% water from the total weight of the manure. On this research was found that the optimal time is on 14th day with characteristic of compost that was produced, equal with the the Indonesia National Standar (SNI Kompos 19-7030-2004). The conclusion is the compcsition of cow dung and Gliricidia sepium leaves did not significant affect to the C/N compost ratio.
Karakteristik Pelumas Bekas Hasil Adsorpsi Menggunakan Arang Batang Kesambi (Schleichera oleosa) dan Zeolit Alam Ende Teraktivasi H3PO4 Cunha, Theodorus M. Da; Fone, Maria Y.B.; Tawa, Bibiana Dho; Ola, Antonius R. B.
Chemistry Notes Vol 4 No (1) (2022): Chem. Notes 2022, 4 (1)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v4i(1).7734

Abstract

Used lubricants contain contaminants from oxidation and thermal degradation, resulting in a decrease in the quality and performance of the lubricant. Therefore, the adsorption process is carried out using kesambi stem charcoal and natural zeolite Ende activated H3PO4 to remove contaminants and improve the quality of used lubricants. Determination of the density and kinematic viscosity of used lubricants mass variations of 0.5, 0.66, 1 and 2 grams for each adsorbent. The results obtained show that the value of the used lubricant density from the adsorption results is relatively the same, namely 0.83 g/cm3, while the kinematic viscosity is different for each variation of the mass and type of adsorbent. Kesambi stem active charcoal has an optimum mass of 0.66 grams with a kinematic viscosity value of 128.84 cSt, active natural zeolite at a mass of 0.5 grams of 113.59 cSt and continued use of active natural zeolite-active natural charcoal, namely at a mass of 2 grams of 106, 38 cSt. These results indicate that the variation in the mass of the adsorbent has no effect on the change in density value but shows a significant change in the increase in the value of the kinematic viscosity of the used lubricant from the adsorption. The best percentage of kinematic viscosity increase efficiency is using activated charocoal, which is 71.83%.
Co-Authors Afred, Merymistika Yufrani Antonius R.B. Ola Bokay, Ernawati A. Cunha, Theodorus M. Da E. Selan, Odi Th. Fone, Maria Y.B. Gauru, Imanuel Hadijah Salim, Siti Hermania Em Wogo Kale, Alfius R. Ledoh, Sherlly M. F. Lulan, Theodore Y. K. Merymistika Y. Afred Nitbani, Febri O. Nurhadyati Pius Dore Ola Pius Dore Ola Sedo, Karolina M. Suwari Suwari Tnunay, Yarni R. Weking, Maria Y. T.