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All Journal Jurnal Teknologi Lingkungan Universitas Trisakti Teknisia Community Development Journal: Jurnal Pengabdian Masyarakat Jurnal Cahaya Mandalika Jurnal Sosial dan Teknologi International Journal of Economy, Education and Entrepreneurship (IJE3) INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Pulchra Lingua
Ratnaningsih Ratnaningsih, Ratnaningsih
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Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Public Health Other

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POTENSI PEMBENTUKAN BIOGAS PADA PROSES BIODEGRADASI CAMPURAN SAMPAH ORGANIK SEGAR DAN KOTORAN SAPI DALAM BATCH REAKTOR ANAEROB Ratnaningsih, Ratnaningsih; Widyatmoko, H.; Yananto, Trieko
Jurnal Teknologi Lingkungan Universitas Trisakti Vol 5, No 1 (2009): JUNI 2009
Publisher : Jurnal Teknologi Lingkungan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (216.998 KB)

Abstract

The research device to produced biogas from mixture the cow feces and fresh organic garbage, on laboratory with batch reactors. Biogas fixation on mixture of liquefied the cow feces and fresh organic garbage divided into five groups (1:0; 3:1; 1:1; 1:3; 0:1) by 4 liter substrates in 24 days, and analyzed by regression method. Measurement of another parameters is: C/N ratio, pH substrate, BOD/COD, Total Solid, and biogas composed. This result showed that the best volume of biogas have produced by unit ratio 1:1 (TS 9%; C/N ratio 9,7) as much as 1,03 liter biogas per liter substrate (12 l/kg TS), and 11,57% methane. Overall biogas have started produce in two days, by temperature 25,5°C – 28,5°C and pH beginning 5,32 – 6,25. Meanwhile the process have been reduction Total Solid as 17 – 61%, and reduction of BOD/COD each one as 25 – 40% and 23 – 52%. Poorly of biogas and methane production have been effected by lowest C/N ratio in each substrate (C/N ratio 9,2 – 10,3), so that the methanogenic process haven’t optimum. The problem effected on pH substrate when lowest in the end of process (5,89 – 6,42), this is showed that acetogenic process still turning. Source of lowest C/N ratio in cow feces (9,2) caused by waste of tempe and tahu that cows consumption, the consumption have been 22,7 kg/cow/day or 89% of total consumption per day. The research showed that biogas production had not on optimal condition, effected by lowest C/N ratio.   Abstract in Bahasa Indonesia:  Penelitian ini bertujuan untuk mengolah sampah organik segar yang dicampur dengan kotoran sapi menjadi biogas, pada skala laboratorium menggunakan reaktor batch. Penentuan jumlah biogas terbaik terhadap pengenceran kotoran sapi perah dan sampah organik segar dilakukan dengan komposisi bahan campuran (1:0; 3:1; 1:1; 1:3; 0:1) dengan volume 4 liter dan waktu pemeraman 24 hari, selanjutnya dianalisis dengan metode regresi. Parameter pendukung yang diuji meliputi: C/N rasio, pH isian, BOD/COD, Total Solid, serta komposisi gas. Hasil penelitian menunjukkan bahwa jumlah biogas terbaik dihasilkan oleh bahan campuran 1:1 dengan kadar TS 9% (rasio C/N 9,7), yaitu sebesar 1,03 liter biogas per liter bahan (12 l/kg TS), dengan kandungan metana sebesar 11,57%. Secara keseluruhan biogas terbentuk pada umur isian dua hari, dengan rentang suhu 25,5°C – 28,5°C dan pH awal sebesar 5,32 – 6,25. Disamping itu juga terjadi penurunan kadar Total Solid lumpur substrat sebesar 17 – 61%, dan penurunan BOD/COD masing-masing sebesar 25 – 40% dan 23 – 52%. Rendahnya produksi biogas dan kandungan metana disebabkan tidak sempurnanya proses methanogenesis akibat terlalu rendahnya rasio C/N pada masing-masing substrat (C/N rasio 9,2 – 10,3), sehingga proses dekomposisi anaerob dalam tiap-tiap reaktor tidak mencapai tahapan methanogenic sempurna. Hal ini berdampak terhadap derajat keasaman substrat yang rendah pada akhir produksi (5,89 – 6,42), yang menandakan masih berlangsungnya tahap acetogenic (tahap produksi asam). Sumber pakan ternak berupa ampas tempe dan ampas tahu merupakan salah satu penyebab rendahnya rasio C/N kotoran sapi perah (9,2). Konsumsi ampas tahu dan tempe mencapai 22,7 kg/ekor/hari atau 89% dari total konsumsi per hari. Penelitian ini memperlihatkan bahwa pembentukan biogas yang dihasilkan belum optimal, akibat C/N rasio yang rendah.
An Examination of The Protagonist in Pidi Baiq's Novel Dilan: Dia Adalah Dilanku 1991 Suparni, Suparni; Ratnaningsih, Ratnaningsih
Pulchra Lingua: A Journal of Language Study, Literature & Linguistics Vol. 1 No. 1 (2022): Pulchra Lingua: A Journal of Language Study, Literature & Linguistics
Publisher : Yayasan Kyadiren

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (76.729 KB) | DOI: 10.58989/plj.v1i1.2

Abstract

Novels are fictional stories that are created by human reflection on the environment and experiences. Within a novel, the author uses their aesthetic experience and creativity to arrange storylines and characters. Examining the characters within a contemporary novel can be intriguing as the main character may reflect the author's idealism and response to their own life. With this in mind, the researcher analyzes the novel "Dilan dia adalah Dilanku 1991" by Pidi Baiq, which has gained popularity among millennial youth. The novel follows the story of high school sweethearts, Dilan and Milea. The researcher focuses on the main characters, Dilan and Milea, and uses a descriptive qualitative method and content analysis to identify certain characteristics related to their characterizations. The study found that Dilan was a romantic, brave, stubborn yet intelligent male figure, while Milea was a loyal, loving, and firm woman.
THE INFLUENCE OF WORK DISCIPLINE AND COMPETENCE ON JOB SATISFACTION MEDIATED BY EMPLOYE PERFORMANCE AMONG PUBLIC AND PRIVATE KINDERGARTEN TEACHERS IN BANTEN PROVINCE Ratnaningsih, Ratnaningsih; Rustandi, Tata; Permana, Angrian
International Journal of Economy, Education and Entrepreneurship (IJE3) Vol. 5 No. 2 (2025): International Journal of Economy, Education and Entrepreneurship
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/ije3.v5i2.386

Abstract

This study aimed to examine the influence of work discipline and competence on job satisfaction, with employee performance as a mediating variable, among public and private kindergarten teachers in Banten Province. Performance issues posed challenges for organizations, requiring strategies such as improving discipline, competence, and satisfaction. The hypotheses proposed that work discipline and competence positively and significantly affected job satisfaction and performance, while job satisfaction positively influenced performance. Employee performance was also expected to mediate the effects of work discipline and competence on job satisfaction. A quantitative approach was applied using Slovin’s formula, involving 200 respondents from 401 ASN kindergarten teachers. Data were analyzed through path analysis. Results showed: (1) work discipline significantly affected job satisfaction (β = 0.334; t = 3.177); (2) competence significantly affected job satisfaction (β = 0.442; t = 4.830); (3) work discipline significantly affected performance (β = 0.441; t = 3.636); (4) competence had no significant effect on performance (β = 0.086; t = 0.887); (5) performance significantly affected job satisfaction (β = 0.444; t = 4.995). Employee performance mediated the effects of work discipline (β = 0.254; t = 3.082; p < 0.05) and competence (β = 0.235; t = 2.717; p < 0.05) on job satisfaction. These findings indicate that improving discipline and competence, supported by optimal performance, enhances job satisfaction among ASN kindergarten teachers in Banten Province.
DESIGN OF PLUMBING SYSTEM AT TUNJUNGAN PLAZA APARTMENT, SURABAYA Meilani, Sarah; Astuti, Ariani Dwi; Ratnaningsih, Ratnaningsih
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Volume 1, Number 1, October 2017
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v1i1.2406

Abstract

Aim: This study of plumbing system plan is  aimed at planning a plumbing system that is compatible with clean water, waste water and rain water management at Tunjungan Plaza apartment, Surabaya City, Indonesia according to SNI 8153-2015, and meet 5 aspects of safety, security, simplicity, beauty, and economy.  It applies water supply system which commonly used for tall buildings, namely Roof Tank system. Methodology and Result: Plumbing system planning methods are collecting and analyzing fluctuation in water use, planning clean water and recycled water systems by endorsing alternative piping for clean water and recycled water. In addition to water supply, recycled water system that utilizes waste water to be recycled for flushing closets and watering plants also required to be implemented. Average daily water consumption is 268 m3/day for clean water and 44 m3/day for recycled water with the capacity of ground water tank for clean water is 564.54 m3 and recycled water is 62 m3. Conclusion, significance and impact study: Clean water supply system will implement roof tank system and recycled water will reutilize wastewater for flushing on toilet tank and watering the plants. Waste water use separated system between grey water and black water and then distributed to STP to be treated and reused for flushing water closet and watering plants. Rain water goes to infiltration well by gravity through designed 1 well. Total amount of investment of plumbing equipment is Rp 2,157,697,501,- with cost of water supply per unit Rp 4,445,643,- meanwhile waste water piping cost per units is Rp 1,070,711,-.
Pengembangan Teknis Operasional Pengelolaan Sampah di Kampus A Universitas Trisakti Menggunakan Penilaian UI GreenMetric Kategori Limbah Barka, A B; Ratnaningsih, Ratnaningsih
Jurnal Sosial Teknologi Vol. 3 No. 3 (2023): Jurnal Sosial dan Teknologi
Publisher : CV. Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jurnalsostech.v3i3.651

Abstract

Perubahan iklim merupakan tantangan terbesar dunia saat ini. UI GreenMetric merupakan sebuah program Green Campus untuk memberikan informasi terkait kondisi dan kebijakan setiap universitas di dunia dalam upaya menghentikan perubahan iklim global. Salah satu kategori penilaiannya adalah limbah. Penelitian ini bertujuan untuk mengevaluasi dan merencanakan pengelolaan sampah di Kampus A Universitas Trisakti, yang memiliki jumlah civitas akademika rata- rata 22.451 jiwa/tahun dan timbulan sampah sebesar 19,68 m3/hari. Kondisi eksisting di Kampus A meliputi pewadahan dan pengangkutan. Setelah dievalusi, hasil penilaian kategori limbah di tahun 2020 mendapatkan skor 600, sesuai dalam UI GreenMetric. Pemilahan sampah di sumber dapat mengurangi sampah yang masuk ke TPS hingga 63,4%. Sampah yang bernilai ekonomis dijual kepada pihak ketiga untuk diolah dan sisanya dikirim ke Bank Kompos serta diolah menjadi briket bahan bakar dengan nilai kalor 5123,53 kcal/kg di TPS 3R Kampus A. Usulan tersebut diharapkan dapat membantu Universitas Trisakti untuk terus meningkatkan kinerja kampus yang berkelanjutan.
PERENCANAAN METODE PRELOADING DENGAN KOMBINASI PREFABRICATED VERTICAL DRAIN (PVD) PADA PERBAIKAN TANAH PROYEK KONTRUKSI JALAN TOL Ratnaningsih, Ratnaningsih; Vidayanti, Desiana
Jurnal Cahaya Mandalika ISSN 2721-4796 (online) Vol. 3 No. 3 (2022)
Publisher : Institut Penelitian Dan Pengambangan Mandalika Indonesia (IP2MI)

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Abstract

Proyek pembangunan infrastuktur jalan tol merupakan upaya dalam mewujudkan pelayanan umum, antara pemerintah daerah dan pemerintah pusat. Salah satu pembangunan jalan tol yang akan dilakukan yakni proyek jalan tol di Kabupaten Semarang, jalan tol ini menghubungkan daerah Kabupaten Semarang dan Yogyakarta. Kondisi tanah dasar pembangunan jalan tol tersebut memiliki jenis tanah lempung lunak dan tanah pasir dengan nilai N-SPT<10. Tanah lempung lunak mencapai kedalaman 24 m, sedangkan tanah pasir dengan N-SPT rendah tersebar pada kedalaman tertentu. Daya dukung tanah lempung lunak tersebut rendah dan memilki permeabilitas tinggi, serta untuk tanah pasir dapat berpotensi akan likuifaksi, sehingga akan dilakukan perencanaan perbaikan metode preloading dengan prefabricated vertical drain (PVD) untuk meningkatkan daya dukung tanah. Metodologi penelitian dimulai dengan pengumpulan data, dan studi literatur. Selanjutnya adalah mengidentifikasi statigrafi perlapisan tanah berdasarkan Boring Log dan Uji Penetrasi Standar. Dilanjutkan dengan menentukan besar penurunan dan lama waktu pemampatan. Penurunan mencapai 0,841 m dengan tinggi preloading 2,7 m. Waktu untuk mencapai derajat konsolidasi alami adalah 16,7 tahun, sedangkan lama waktu konsolidasi dengan PVD adalah 90 hari.
BUDI DAYA MAGGOT SEBAGAI UPAYA PEMROSESAN FOOD LOSS DAN FOOD WASTE (FLW) Purwaningrum, Pramiati; Yanidar, Ramadhani; Ratnaningsih, Ratnaningsih; Yulinawat, Hernani; Yuslim, Silia
Community Development Journal : Jurnal Pengabdian Masyarakat Vol. 5 No. 3 (2024): Volume 5 No. 3 Tahun 2024
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/cdj.v5i3.29711

Abstract

FLW merupakan ancaman serius terhadap ketahanan pangan serta perekonomian dunia. SDG 12.3 adalah konsumsi dan produksi yang bertanggung jawab yaitu menargetkan pengurangan FLW per kapita sampai separuhnya pada 2030. Timbulan sampah Indonesia 17 juta ton/tahun, hampir 70% merupakan sampah organik bersumber 38,3% dari rumah tangga dan jenis sampah terbanyak 42,4% adalah sisa makanan. Sekitar 44% limbah makanan berkontribusi terhadap Tempat Pemrosesan Akhir (TPA) di Indonesia. Metode PkM yang digunakan adalah penyuluhan pemilahan FLW dan pelatihan budidaya maggot menggunakan larva Black Soldier Fly (BSF), untuk mendaur ulang dan mengolah sampah organik. Masyarakat sangat antusias karena Tim PkM FALTL Universitas Trisakti menyiapkan insektarium sederhana agar budidaya maggot dapat langsung diterapkan. Peran masyarakat dalam mengurangi timbulan food waste di rumah tangga sangat penting dan signifikan. Hal ini juga sangat signifikan dalam penurunan gas rumah kaca (GRK) jika dibandingkan dengan pengurangan yang sama di food waste katering, restoran dan hotel, serta food loss pasca panen dan produksi. Kemampuan masyarakat dalam membudidayakan BSF penghasil maggot dan kasgot sebagai media pemrosesan sampah organik FLW perlu didukung dengan pelatihan dan penerapan prosedur secara benar agar tidak menyebabkan masalah lingkungan dan kesehatan baru.
Evaluation of liquefaction potential in reworked volcanic-colluvial deposits of the Bawen Area, Semarang Regency Vidayanti, Desiana; Ramli Nazir; Ratnaningsih, Ratnaningsih; Komerdevi, Det; Simatupang , Pintor Tua; Fitriani, Eka Nur
Teknisia Vol 30 No 2 (2025): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol30.iss2.art1

Abstract

Liquefaction is a major geotechnical hazard that can severely damage infrastructure in earthquake-prone areas. This study evaluates the liquefaction potential of volcanic–colluvial deposits in Semarang Regency, Central Java, using Standard Penetration Test (SPT) data and the Simplified Procedure of Seed and Idriss (1971). Cyclic Stress Ratio (CSR) and Cyclic Resistance Ratio (CRR) were computed to obtain Factors of Safety (FS) under three earthquake scenarios (Mw = 5.0, 5.9, and 6.5). Results show that for Mw = 6.5, the shallow sandy layers at 0-3 m have FS = 0.07-0.21 (highly susceptible), while the 4.5-9 m interval is FS = 0.8-0.96 (marginal to near-threshold) and and the >10 m strata remain stable (FS > 1.2). For Mw = 5.9, shallow liquefaction is confined to 0-3 m (FS = 0.09-0.27), with the 4.5-9 m zone showing FS = 1.0-1.2 (marginal to stable). Even for Mw = 5.0, the 0-3 m layer yields FS = 0.14-0.41, indicating liquefaction susceptibility, whereas deeper layers are stable (FS > 1.0-1.2). These findings indicate that loose, saturated silty-sand layers with shallow perched groundwater are the most critical to cyclic softening. The site is underlain by reworked volcanic-colluvial materials derived from Mount Ungaran, characterized by fine-grained, near-saturated deposits within the upper 10 m. Compared with previous studies in northern Semarang, this study highlights the moderate liquefaction susceptibility of southern volcanic-colluvial terrains, an area rarely analyzed in Central Java and provides practical insights for toll-road foundation design and mitigation strategies in similar geological settings.
Co-Authors Angrian Permana, Angrian Ariani Dwi Astuti Asih Wijayanti, Asih Barka, A B Dwi Indrawati, Dwi Ellis Salsabila, Ellis Fitriani, Eka Nur H. Widyatmoko, H. Ibnu Hadi Komerdevi, Det Kusumadewi, Riana Ayu Meilani, Sarah Pramiati Purwaningrum, Pramiati Ramadhani Yanidar Ramli Nazir Rositayanti Hadisoebroto Rustandi, Tata Silia Yuslim Simatupang , Pintor Tua Suparni suparni Tazkiaturrizki, Tazkiaturrizki Vidayanti, Desiana Winarni Winarni Yananto, Trieko Yulinawat, Hernani