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All Journal Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY
Safitri, Lisma
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Energy Engineering Environmental Science

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ASSESSING GROUNDWATER QUALITY IN NORTH JAKARTA: A STATISTICAL APPROACH Wijayanti, Yureana; Kusumadewi, Riana Ayu; Wijaya, Nicholas Albert; Safitri, Lisma; Kristanti, Risky Ayu
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 8, NUMBER 1, APRIL 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v8i1.18152

Abstract

Aims: This study investigates the groundwater quality in North Jakarta. Methodology and results: The groundwater data from thirty-one sampling sites were analyzed for physical and chemical parameters such as total dissolved solids (TDS), pH, turbidity, nitrate (NO3), sulfate (SO4), chloride (Cl), manganese (Mn), fluoride (F), and iron (Fe). Principal Component Analysis (PCA) and Spearman’s correlation matrix were utilized to evaluate the contamination sources. Conclusion, significance, and impact study: The findings reveal significant variability in chloride and total dissolved solids (TDS) concentrations, while fluoride levels remained stable. Strong correlations were found between TDS and chloride, as well as, turbidity and iron, suggesting contamination from seawater intrusion and industrial activities. PCA identified four key components explaining 77% of the total variance. The first component, dominated by TDS, turbidity, iron, and chlorine, indicates ongoing seawater infiltration in the coastal aquifer. The second component, associated with turbidity, nitrate, and fluoride, indicates contamination from human activities. This study shows the value of multivariate statistical techniques like PCA, in assessing groundwater quality. The correlation matrix further confirms the influence of seawater on groundwater salinity and the presence of heavy metals, possibly due to soil disturbance. Moreover, there is an influence of geological and geographical factors, particularly the excessive groundwater extraction leading to seawater intrusion and groundwater quality deterioration. 
Minimize Oil Losses in Palm Oil Mill through Optimalization of Sludge Separator Performance Fadhilah, Nabillah Nissya; Safitri, Lisma; Alfian, Ulil Albab; Dharmawati, Nuraeni Dwi; Renjani, Rengga Arnalis
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 1 (2024): March 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i1.123-131

Abstract

One of the most important clarification station engine parts for reducing oil loss is the sludge separator. The sludge separator uses high-speed centrifugal force to capture any oil that is still adhered to the sludge. This study aims to improve the working performance of sludge separator to minimize oil losses through variations in feeding rate, oil under flow and temperature of flow rate. The experiment was conducted at one of the palm oil mills in Central Kalimantan, with a capacity of 45 ton/h. Variations in sludge separator feed rates: 23, 25 and 27 tons/hour. Oil underflow variations: 5%, 6%, and 7%. Feed temperature variations are: 90°C, 93°C, and 95°C. Feed temperature variations:  90°C, 93°C, and 95°C. Based on research that has been done, using bait rate of 23 ton/h, temperature 90 °C, and oil underflows 5%, resulting in oil losses of 0.54% – 0.61%. This study has managed to lower oil losses in the sludge separator by 0.11 % and shows the level of stability below the standard that has been determined. Keywords:  Crude palm oil,  Oil losses,  Palm oil mill,  Sludge separator, Underflow
Co-Authors Alfian, Ulil Albab Dharmawati, Nuraeni Dwi Fadhilah, Nabillah Nissya Kusumadewi, Riana Ayu Renjani, Rengga Arnalis Risky Ayu Kristanti Wijaya, Nicholas Albert Wijayanti, Yureana