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Ledoh, Sherlly M. F.
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy 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.
Purification and Characterization of Silica Rice Husk Ash (Oryza Sative L.) From Kupang Regency Lede, Mega O. L.; Wogo, Hermania Em; Lulan, Theodore Y. K.; Ledoh, Sherlly M. F.
Chemistry Notes Vol 3 No (1) (2021): Chem. Notes 2021, 3(1)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v3i(1).4745

Abstract

This research had been done to purify and characterize silica from rice husk ash for two varieties of rice from Kupang Regency. The purification method used is the extraction method with alkaline solution (NaOH) and precipitation with acid solution (H2SO4). The stages in this research were preparation of rice husk ash, purification of silica rice husk ash with NaOH and H2SO4 solutions, and characterization covered: determination of acidity and surface area and determination of composition using X-ray fluorescence spectrophotometer (XRF). The results of the surface acidity test showed that the highest acidity was in Ciherang silica from Tarus, which was 2.288 mmol/g. While the surface area test showed that the largest surface area was Inpari 46 silica from Pariti, which was 184.297 m2/g with an optimum contact time of 50 minutes. The results of characterization using XRF exhibited that the highest silica purity was Ciherang rice variety from Tarus, with initial silica content data, purification with NaOH and H2SO4 were 93.9%; 98.2% and 99.1%. So that the purification process with NaOH and H2SO4 is proven to increase the silica content in the sample.
Penurunan Kadar TSS Dan COD Limbah Cair Rumah Pemotongan Hewan Menggunakan Elektrolisis Ledoh, Sherlly M. F.; Dasul, Aprilia R. T.; Ola, Pius D.; Ola, Antonius R. B.
Chemistry Notes Vol 4 No 2 (2022): Chem. Notes 2022, 4 (2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v4i2.9652

Abstract

Research has been carried out on Reducing COD and TSS Levels of Slaughterhouse Liquid Waste Using the Electrolysis Method. This study aims to analyze the effect of electrolysis time and voltage (voltage) on the reduction of COD and TSS levels of RPH waste water using the electrolysis method. Electrolysis is the decomposition of electrolytes by direct electric current using two kinds of electrodes as conductors of electric current. The results showed that the longer the electrolysis time and the greater the voltage, the percentage of reduction in COD and TSS levels increased. The percentage reduction obtained was 31.43% COD and 95% TSS at 120 minutes of electrolysis time and 12 volts of voltage.
Analisis Penurunan Kadar TSS, COD Dan BOD Pada Limbah Cair RSUD Mgr. Gabriel Manek, SVD Atambua Nusa Tenggara Timur Dengan Metode Elektrolisis Ledoh, Sherlly M. F.; Bere, Dau D.; Darmakusuma, Dodi D.; Lerrick, Reinner Ishaq
Chemistry Notes Vol 4 No 2 (2022): Chem. Notes 2022, 4 (2)
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/cn.v4i2.9658

Abstract

A research on waste water treatment using electrolysis has been carried out. The purpose of this study was to determine the optimum condition of electric voltage or time in reducing the Total Suspended Solid (TSS), Chemical Oxygen Demand (COD) and Biochemical Oxygent Demand (BOD) of Mgr. Gabriel Manek, SVD hospitall’s waste effluent. The method used in this study was carbon-carbon electrolysis method. The results showed decreasing of TSS levels from 2880 mg/L to 40 mg/L with % removal of 98.61%, COD levels from 8,240 mg/L to 2,883 mg/L with % removal of 65.34% and BOD levels of 520 mg/L to 40 mg/L with a % removal of 92.30%.
Co-Authors Antonius R.B. Ola Bere, Dau D. Bokay, Ernawati A. Darmakusuma, Dodi D. Dasul, Aprilia R. T. Gauru, Imanuel Hermania Em Wogo Lede, Mega O. L. Lerrick, Reinner Ishaq Lulan, Theodore Y. K. Ola, Pius D. Tawa, Bibiana D. Weking, Maria Y. T.