The increasing volume of organic waste in garbage dump facilities will emit methane gas, which is one of the greenhouse gases that cause global warming. By producing eco enzymes from fruit peel and vegetable waste, we can minimize organic waste while also creating beneficial products. In this research, eco-enzyme was produced from papaya, dragon fruit, and orange peel waste mixed with water and molasses. The weight ratio between water, organic compounds, and molasses was 10:3:1. The mixture was fermented for 3 months. The DNS method was used to test enzyme activity; the ASTM 2315:2008 method was used to measure bacteria killing power; and the SNI 06-6989-3-2004 method was used to measure TSS levels in liquid waste.The Eco enzyme product generated from this research has an amylase enzyme activity of 2.15 and a cellulase activity of 1.69. Eco enzyme effectiveness in killing E. coli bacteria reaches 99.95% and P. aeruginosa bacteria at 99.90% with only 20% of eco enzyme concentration within 15 seconds of contact time. The results of liquid waste processing using this eco enzyme show that TSS reduction rate is 65-88% on an initial TSS concentration of 345 ppm.
Penentuan laju infiltrasi bertujuan untuk menentukan laju masuknya air kedalam tanah. Dimana penentuan ini di uji dari berbagai penggunaan lahan dengan memperhatikan faktor infiltrasi seperti, kerapatan vegetasi penutup, tekstur tana, permeabilitas, dan kemiringan lereng. Model yang di uji bersifat empiris yang dimana model ini merupakan fungsi persamaan tergantung waktu, dengan menggunakan model Horton. Infiltrasi sangat menentukan berlangsungnya proses hidrologi yang terjadi di suatu daerah. Dimana infiltrasi ialah proses masuknya air kedalam tanah baik air hujan maupun air irigasi. Laju infiltrasi dengan nilai yang kecil mendadakan kondisi tanah di daerah tersebut telah jenuh dan jenuhnya air tersbut akan menyebabkan air permukaan dan akan mengakibatkan aliran permukaan. Semakin kecil nilai infiltrasi makan akan semkain besar air limpasnya. Pada kegiatan pertambangan nilai laju infiltrasi berpengaruh pada kondisi tanah selain itu juga berpengaruh terhadap limpasan air yang terjadi di area pertambangan. Penelitian dilakukan di LIPI Karangsambung lebih tepatnya di Desa Tlepok, Karangsambung, Kebumen, Jawa Tengah. Data infiltrasi diperoleh dengan menggunakan alan doublering infiltrometer. Pada akhirnya akan diketahui perta persebaran laju infiltrasi menggunakan metode IDW dari perangkat lunak Arcgis.
Mining activities in general are high risk and high financing activities. One of the risks that are of concern to mining activities is related to occupational health and safety (OHS). The importance of OHS for the mining industry, the Community Service (CS) team of the Faculty of Earth and Energy Technology conducted counseling activities and discussions on the importance of the implementation of OHS in the field of mining. OHS counseling is done at Pillar Artha Sejahtera Company which is one of the small-scale mining industries that conduct andesite stone mining with a quarry system located in Lampung. Participants in this CS activity in addition to the team consisting of lecturers and employees and also followed by employees and leaders of PAS Company. CS activities are carried out by the method of exposure of material by the team which was previously preceded by field survey activities conducted by the CS team and furthermore is a discussion activity. Based on the discussions that developed during the activity, employees and leaders of PAS Company appreciates and is very grateful for the implementation of CS activities, because through this activity there is a refreshment of understanding and deepening of OHS material that has been an integral part of PAS Company. PAS Company hopes that activities like this should continue to be carried out, even not only for CS activities, it can also be for teaching and research activities.
Bencana longsor yang terjadi di Bukit Kaliwadas, Kecamatan Kedungwaru, Karangsambung, Kebumen, Jawa Tengah, mengakibatkan rusaknya jalan, terputusnya jembatan yang menghubungkan daerah di bawah dan di atas bukit serta mengganggu sistem irigasi sawah warga setempat. Air hujan yang mengalir pada bukit tersebut akan meresap ke dalam tanah dan akan menjadi air tanah. Keberadaan air tanah akan menyebabkan pori-pori tanah terisi oleh air sehingga tanah tidak mampu menahan beban pada lapisan tanah tersebut. Keberadaan air tanah dipengaruhi oleh hujan. Curah hujan yang tinggi akan meningkatkan tinggi muka air tanah dan menurunkan nilai faktor keamanan lereng. Hal ini yang dikhawatirkan akan menimbulkan longsor susulan. Pengaruh keberadaan air tanah terhadap kestabilan lereng harus diteliti lebih lanjut agar diperoleh nilai faktor keamanan pada lokasi penelitian. Keberadaan air tanah dapat diperoleh dengan menggunakan metode geolistrik resistivitas. Metode geolistrik resistivitas memanfaatkan sifat kelistrikan material dibawah permukaan bumi. Pengukuran dilakukan dengan menggunakan konfigurasi Schlumberger. Metode pengambilan data menggunakan metode 1D (Vertical Electrical Sounding) dengan 4 titik pengukuran. Panjang tiap bentangan elektroda arus berkisar antara 50-89 meter. Keberadaan aquifer akan diperoleh dari pengukuran geolistrik. Aquifer bebas akan menunjukkan tinggi muka air tanah. Semakin tinggi keberadaan muka air tanah, semakin besar pula pengaruhnya terhadap faktor keamanan lereng. Perhitungan faktor keamanan lereng menggunakan metode Janbu yang disederhanakan dan perhitungan diakukan menggunakan software Slide 6.0. Hasil yang diperoleh dari perhitungan software Slide berupa nilai faktor keamanan. Hasil yang diperoleh menunjukkan nilai faktor keamanan deterministik sebesar 1,942 dan nilai faktor keamanan probabilistik yang dihasilkan sebesar 1,926 yang semua nilainya diatas 1. Pada kondisi ini keberadaan air tanah belum menyebabkan longsor
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