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Harimbi Setyawati
Institut Teknologi Nasional Malang
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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Journal : Journal of Sustainable Technology and Applied Science

 1 
EFFECT OF ELECTRODE DISTANCE AND VOLTAGE ON CR, COD, and TSS REDUCTION IN WASTE WATER TANNING INDUSTRY USING ELECTROCOAGULATOR BATCH Setyawati, Harimbi; Galuh, Dinda; Yunita, Erni
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 2 No. 1 (2021): Journal of Sustainable Technology and Applied Science, May 2021
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v2i1.3574

Abstract

Wastewater from the tanning industry has relatively high Cr, COD, and TSS metal pollutants. According to the regulation of the Minister of Environment of the Republic of Indonesia No. 5 of 2014 concerning the quality standard of wastewater for industrial activities, the standard quality value is 0.6 mg/L of Cr, 110 mg/L of COD, and 60 mg/L of TSS. This research aimed to determine the effect of electrode distance and voltage on reducing Cr, COD, and TSS levels in the wastewater from the tanning industry using batch electrocoagulation. The electrocoagulation method used in this research with fixed variables was the number of 2 plate electrodes and the changing variables; it was the distance between the electrodes (1, 1.5, 2, 2.5 and 3 cm) and the electric voltage (3, 6 and 9 volts). The research was conducted on a laboratory scale in batches with a capacity of 10 litres. The electrodes used were aluminium (Al) as the anode and the cathode in plates. The analysis showed that the highest percentage reduction in COD reached 88.8889% and the highest Cr reached 83.4712% occurred at a distance of 2 cm with 9 volts voltage, the highest percentage reduction in TSS reached 85.0746% with a distance of 3 cm with 9 volts voltage. From the results of this research, it could be concluded that the electrocoagulation method in the batch electrocoagulator was efficient enough to reduce the levels of Cr, COD, and TSS with variable electrode distance and electric voltage.
ENZIMATIC HYDROLYSIS PROCESS FOR INCREASING GLUCOSE LEVELS FROM COCONUT HUSK WASTE Anggorowati, Dwi Anna; Sriliani, Sriliani; Artiyani, Anis; Setyawati, Harimbi; J, Kevin
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 2 No. 2 (2021): Journal of Sustainable Technology and Applied Science, November 2021
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v2i2.3579

Abstract

Coconut husk waste is waste that has not been used optimally, generally only as a craft material. Seeing the composition of coconut husk, it has the potential to be used as an alternative fuel, one of which is to produce bioethanol products. The purpose of this research was to utilize coconut husk waste as raw material for bioethanol production and to assess the effect of the number of enzymes and time of hydrolysis on the glucose levels produced. In this research, the authors focused on obtaining glucose levels from coconut husks by hydrolysis using cellulase enzymes with an activity of 700 EGU/g. The variations used in this research were the volume of cellulase enzymes (2, 3, 4, 5, 6) ml and the hydrolysis time (4, 8, 12) hours. After the coconut husk undergoes physical and chemical treatment using 10% NaOH, there is a decrease in lignin levels from 44% to 14% and there is an increase in cellulose levels from 24% to 38%, and the use of a cellulase enzyme volume of 2 ml with a hydrolysis time of 4 hours was more optimal with a glucose level of 0.32%.
THE EFFECT OF FILLER CONCENTRATION VARIATIONS AND DRYING TEMPERATURE ON JUWET (SYZYGIUM CUMINI) POWDER INSTANT DRINK Nilna Minah, Faidliyah; Setyawati, Harimbi; Junita, Erni; Muyassaroh
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 3 No. 2 (2022): Journal of Sustainable Technology and Applied Science, November 2022
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v3i2.4338

Abstract

Juwet fruit has a sour taste. The purple color of this ripe juwet comes from anthocyanins. Anthocyanins in fruit or vegetables can appear as red, purple, or blue, depending on the acidity (pH) conditions. Anthocyanins also act as a source of antioxidants. Antioxidants from anthocyanins are relatively safer than synthetic antioxidants that allow the promotion of carcinogenesis. Antioxidants will stimulate the body's system response to destroy free radicals. The magnitude of the benefits of antioxidants has encouraged many researchers to lift the natural potential with high antioxidant content to be processed into practical and easy dishes. Therefore, Juwet fruit processing is needed to increase public acceptance of Juwet fruit, one of which is by removing tannins from Juwet fruit by blanching and processing juwet fruit into instant powder that is practical and easy to consume. Both in the process of evaporation and drying. The purpose of this research is to increase the economic value of Juwet fruit as an instant powder drink which is rich in vitamins and high in antioxidants. Optimization of the process is carried out by combining the evaporation and drying processes to obtain products that comply with SNI standards. From the results of this study, the highest Vitamin C content was obtained at a drying temperature of 500C, which was 0.128%/1 g with an antioxidant reactivity of 50%.
MAKING LIQUID DISHWASHING SOAP FROM USED COOKING OIL WITH KOH AND NaCl CONCENTRATION VARIATIONS USING SAPONIFICATION PROCESS Setyawati, Harimbi; Anggorowati , Dwi Ana; Yunita , Erni; Angreani, Firda Nur; Fajriyatul , Fresti
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 4 No. 2 (2023): Journal of Sustainable Technology and Applied Science, November 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v4i2.5994

Abstract

ABSTRACT. Used cooking oil is cooking oil that has been used repeatedly until the colour changes into dark brown or black. If this substance is immediately disposed of, it will pollute the environment and can reduce soil fertility. Used cooking oil as used cooking oil can be reprocessed into raw materials for non-food industries, such as biodiesel, candles, and soap. This study aims to obtain optimal variables of KOH concentration and NaCl concentration in the saponification process of making liquid dish soap from used cooking oil. The variables used in this study consisted of a fixed variable, namely the amount of used cooking oil, and the changing variables were variations in the concentration of KOH (10%, 20%, 30%, 40%, 50%) and variations in the concentration of NaCl (24%, 27%, 30 %). The research was conducted at the Microbiology Laboratory of ITN Malang. The analysis showed that the highest percentage decrease in water content reached 8.4%, free fatty acids 1.03% at 50% KOH concentration and 30% NaCl concentration. The highest percentage increase in viscosity is called 2214.25 cps, 0.15% free alkali, 1.88% high foam, and pH 11.2 at 50% KOH concentration and 30% NaCl concentration. From the study results, it can be concluded that the saponification process with variations in the concentration of KOH and NaCl used in making liquid soap affects the characteristics of the liquid soap produced.
CHEMICAL DELIGNIFICATION OF MALANG ARABICA COFFEE HUSK WASTE FOR ALTERNATIVE ENERGY Anggorowati, Dwi Anna; Setyawati, Harimbi; Handaratri, Anitarakhmi; Dewi, Rini Kartika; Surbakti, Sriliani
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 6 No. 1 (2025): Journal of Sustainable Technology and Applied Science, May 2025
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v6i1.8131

Abstract

Malang Regency is an area that has the potential to be the largest coffee producer in Indonesia. The coffee processing in Malang Regency will yield approximately 65% coffee beans and 35% coffee husk waste, resulting in an estimated production of about 3,235 tons of coffee husk waste from a total coffee productivity of 9,245 tons. The coffee husk, a by-product of coffee processing, is a waste that has not been utilized to its full potential. Generally, people only use it for fodder and compost. The coffee husk waste contains a lignin content of 29%, hemicellulose at 24%, and the highest cellulose at 33%. Adequate cellulose content of the material for the manufacture of bioethanol is more than 30%; from the composition of Arabica coffee husk, the cellulose content is more than 30%. So it can be used as an alternative fuel, like bioethanol. This research aimed to reduce the lignin content and increase the cellulose content in coffee husk waste through chemical treatment with NaOH. The research stages involved placing 5 grams of coffee husk powder, sized at 80 mesh, into a glass beaker. Next, 50 ml of NaOH solution with concentrations of 5.0%, 5.5%, 6.0%, 6.5%, and 7.0% (v/v) was added. The sample was put in an autoclave at 121°C for 15, 30, 45, and 60 minutes. The best time was 30 minutes with an NaOH concentration of 7%, with the highest cellulose content obtained; it was 55%.
Co-Authors -, Solekah -, Solekah Ahmad Rifa'i, Andi Alexander Marsen, Vinsen Anggorowati, Dwi Anna Angreani, Firda Nur Anis Artiyani Anita Anitarakhmi Handaratri Arif, Muhammad Amrizal Ashari, Mohammad Ibrahim Bagas A. Jatyaraga Bagas A. Jatyaraga, Bagas Budiharso, Hery Setyo Dayal Gustopo Dhea Dwi Novitasari Dian Kurnia S. Dinda An Nisa Dinda Galuh Puspitaningrum Dita aulia, Dewi Dwi A. Anggorowati Dwi A. Anggorowati, Dwi Dwi Ana A Dwi Ana A Dwi Ana Anggorowati Erni Junita Erni Junita Sinaga Erni Junita Sinaga Erni Yunita, Erni Faidliyah Nilna Minah Fajriyatul , Fresti Galuh, Dinda Gustopo, Dayal Hastuti, Rakhmawati Indriani, Sri Iva Izatul Mila J, Kevin Jimmy Jimmy Josephine Vania Wisnurusnadia Julianus Hutabarat Krismantono, Mawan L.A, Salammia LA, ST Salamia Lalu Topan Sulistiyono Leonardo K. Atmadja Leonardo K. Atmadja, Leonardo Lisdayanti, Rahajeng M. Zamroni B. F. A Masfianis Rahayu, Alfickril Mawan Kriswantono Mona Riso S. MUYASSAROH Muyassaroh Muyassaroh Muyassaroh Muyassaroh Muyassaroh Nanik Astuti Rahman Nathania, Devona Nelly Budiharti Nisa, Dinda An Nugraha, Ivan Nur Handayani, Hetty Nur Hendri Wahyu Firdaus Nurwijayanti Priscilla Tamara Putri, Chrysant Arasati Rakhmawati Kriswantono Rini Kartika Dewi S., Dian Kurnia S., Mona Riso Salammia LA Sandy, Faradilla Sanny Andjar Sari Sanny Anjarsari Sari, Fitria Rekno Sari, Sanny Andjar Satria Y Sekar Arum Sari Sri Indriani Sriliani Surbakti Sriliani, Sriliani ST. Salamia LA Sudjana, Wayan Sumanto Wahyuni , Nani Wayan Sujana Wulandari, Luluk Sutri Yulianti, Erni Yunita , Erni Zahwa, Nadila