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Pressure Effect on Turbidity, pH, Lead Content, and Coliform during the Demineralization Process of Brackish Water Camelia Amandasari; Ilma Fadlilah; Rosita Dwityaningsih
CHEESA: Chemical Engineering Research Articles Vol. 8 No. 2 (2025)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v8i2.17424.103-109

Abstract

Brackish water is a mixture of freshwater and seawater and typically exhibits intermediate physicochemical characteristics. Cilacap City is located in a coastal area, resulting in the mixing of freshwater from river systems with seawater intrusion, thereby producing brackish water with relatively high mineral content. Demineralization is a water purification method that can be applied to treat this type of water or wastewater, producing water with significantly reduced mineral content suitable for various uses. Therefore, this research aimed to investigate the effects of operating pressure on turbidity, pH levels, lead (Pb) concentration, and coliform content during the demineralization of brackish water. This research was carried out from March to June, and the sample of brackish water was obtained from the Northern Cilacap Payau Forest Tour Area. Purification method of demineralization process consists of the filtering of silica sand, zeolite adsorption, membrane filtration, and ion exchange with anion resin and cation resin repeatedly. The best result obtained was a pressure of 10 psi with a pH level of 5.9, decreasing turbidity of 90.81%, lead level content of 28.125%, and coliform bacteria of 55.49%
Synthesis of KAl(SO4)2 Solid Coagulants from Used Pots and Beverage Cans Nanda Mustikarini; Ilma Fadlilah; Theresia Evila Purwanti Sri Rahayu
CHEESA: Chemical Engineering Research Articles Vol. 7 No. 2 (2024)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v7i2.17766.84-89

Abstract

Used pots and beverage cans are good sources of aluminum-rich raw materials for the synthesis of potassium aluminum sulfate (KAl(SO4)2), a solid coagulant. The synthesis process includes preparation, dissolution, extraction, sedimentation, and drying. Therefore, this research aimed to determine the characteristics of KAl(SO4)2 synthesized from aluminum pots and beverage cans waste, adjusted to the quality requirements of commercial KAl(SO4)2 according to SNI 06-2102-1991 standard. The materials used were aluminum pots, as well as a mixture of pots and beverage cans, with varying concentrations of 20%, 30%, and 40% KOH solvent. The synthesis results, characterized by XRF (X-ray fluorescence), showed an Al content of 0.001-3%. In addition, the results of the data analysis, adapted to SNI 06-2102-1991 standard for potassium aluminum sulfate, indicated that the synthesis met the required parameters for water-insoluble parts, Fe, Pb, and As, and Al2SO3, which was close to the quality requirements.
PEMANFAATAN ZEOLIT NaY SEBAGAI ADSORBEN UNTUK PENGOLAHAN LIMBAH CAIR SISA PENGUJIAN CHEMICAL OXIGEN DEMAND (COD) Rena Jayana; Ilma Fadlilah; Oto Prasadi
Jurnal Reka Lingkungan Vol 14, No 1 (2026)
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekalingkungan.v14i1.85-96

Abstract

Limbah yang dihasilkan oleh laboratorium kimia yang masih mengandung logam berat yaitu Fe merupakan definisi limbah cair sisa pengujian Chemical Oxygen Demand (COD). Adsorpsi merupakan satu dari beberapa metode yang dapat digunakan untuk mengolah limbah cair tersebut. Zeolit NaY merupakan zeolit sintesis dengan sumber Si dari limbah daun nipah dan sumber Al dari alumunium foil bekas yang digunakan sebagai adsorben untuk menurunkan logam Fe, Chemical Oxigen Demand (COD),  dan Total Suspended Solid (TDS) dalam limbah cair sisa pengujian COD. Tujuan penelitian ini adalah untuk mengetahui waktu kontak optimum zeolit NaY dalam mengolah limbah cair sisa pengujian COD. Limbah cair yang akan diolah menggunakan zeolit NaY akan dikondisikan pH awal nya di angka 5. Variasi waktu kontak zeolit NaY dengan limbah cair dalam penelitian ini yaitu 30 menit, 60 menit, 90 menit, 120 menit, dan 150 menit. Waktu kontak 120 menit dan 150 menit merupakan waktu kontak optimum oleh zeolit NaY yang dapat menyisihkan logam Fe dengan efisiensi sebesar 93,2 %. Parameter COD dapat disisihkan dengan efisiensi sebesar 31,4 % pada waktu kontak 150 menit. Serta parameter TDS dapat disisihkan dengan efisiensi sebesar 75,5 % pada waktu kontak 60 menit.Kata kunci: zeolit NaY, adsorpsi, limbah cair.
Pengaruh Komposisi Bahan Baku dan Kadar Perekat Tepung Tapioka Terhadap Kualitas Briket dari Campuran Daun Ketapang dan Tempurung Kelapa Hanan Izdihar Rashif Hunsa; Rosita Dwityaningsih; Ilma Fadlilah; Zhilal Shadiq; Sari Sekar Ningrum
Infotekmesin Vol 16 No 2 (2025): Infotekmesin: Juli 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i2.2483

Abstract

Ketapang leaves are an example of biomass that can be used to make briquettes. However, ketapang leaves produce a low calorific value, so they require additional ingredients to increase the calorific value, one of which is coconut shell. This research aims to evaluate how variations in raw material composition and adhesive content of tapioca flour affect the quality of briquettes on the parameters of calorific value, water content, ash content, volatile substances, fixed carbon content, and density. The method applied in this research involved mixing ketapang leaf charcoal and coconut shell charcoal, then adding adhesive in the form of tapioca flour. The study results showed that all the briquettes tested met SNI 8966-2021 standards except for the density parameter. The conclusion of this study is that the greater the composition of the briquette raw materials and the lower the adhesive content of tapioca flour, the better the quality of the briquettes. The mixed briquettes that produce the best quality are composed of 20% Ketapang leaf charcoal and 80% coconut shell charcoal. The tapioca flour adhesive that delivers the best quality briquettes is at a percentage of 5%.