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All Journal Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri Jurnal Rekayasa Proses
Ramadhanti, Annesa Mahsa
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Microplastics pollution in sediment of Serang River Kulon Yogyakarta Province Ismiyati; Utami, Inggita; Tricahya, Fahmi Hermawan; Pidianto; Rahmawati, Suci; Ramadhanti, Annesa Mahsa; Sakti, Anjar Dimara
Jurnal Rekayasa Proses Vol 17 No 1 (2023): Volume 17, Number 1, 2023
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.73233

Abstract

Microplastics that can harm living things have been found in large rivers in Yogyakarta Province to the digestive tract of fish. However, rivers in the suburban areas of the province, such as the Serang River, have not yet been identified, although many local communities still use them. This study aimed to analyze the abundance, type of polymer, and characteristics of microplastics found in Serang River sediments. Sampling was carried out in December 2019 in the upstream, midstream, and downstream areas of the river. Six sediment samples were taken from each area and randomly divided into two stations. Each sediment sample was then dried, weighed dry, separated the microplastics, observed visually, calculated the abundance of microplastics, grouped shape, size, and color (characteristics), identified the type of polymer by Fourier-transform infrared spectroscopy (FTIR) test, and analyzed quantitatively descriptively and inferentially. The results showed that microplastics were present in all samples with an abundance range of 148.88 to 384.58 particles kg-1. The abundance of microplastics in Serang River sediments was highest in the downstream area, with an average of 321.99 ± 46.76 particles kg-1. The microplastic was identified as a polyethylene polymer as the main ingredient for making single-use plastics. The characteristics of microplastics in Serang River sediments are dominated by a size range of 10-50 m, in the form of fragments and films, and transparent colors.
Pengaruh Konsentrasi Karboksimetil Selulosa (CMC) pada Pembuatan Lime Milk dalam Penetralan Air Asam Tambang (AAT) Ramadhanti, Annesa Mahsa; Putra, Arif Ferdiansyah; Hasyim, Ummul Habibah
Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri 2021: Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (163.393 KB)

Abstract

Salah satu permasalahan yang terjadi pada industri pertambangan adalah terbentuknya air asam tambang yaitu air hujan atau air tanah yang tercampur dengan batuan yang mengandung sulfida tertentu yang ada di dalam batubara. Sehingga air tersebut bersifat sangat asam serta mengandung zat besi dan mangan dalam konsentrasi yang tinggi. Dalam hal ini dibutuhkan material basa untuk menetralkan Air Asam Tambang sebelum masuk ke lingkungan. Tujuan penelitian ini untuk mendapatkan produk yang ramah lingkungan sebagai penetral Air Asam Tambang. Penelitian ini menggunakan metode netralisasi dengan Lime Milk yang berbahan baku kalsium hidroksida (Ca(OH)2) untuk menaikan pH Air Asam Tambang. Lime milk tersebut diuji efektifitasnya melalui uji Jartest dan diuji viskositasnya menggunakan viskometer dengan konsentrasi karboksimetil selulosa yang bervariasi sebagai koagulan. Variasi dari konsentrasi karboksimetil selulosa ialah 5, 25, 50, 75 dan 100 ppm dalam 1000 mL larutan kapur Ca(OH)2. Pada konsentrasi 25 ppm karboksimetil selulosa sudah menghasilkan produk Lime Milk dengan kekentalan yang stabil dan efektif untuk menaikan pH Air Asam Tambang dari pH <3 menjadi pH >6.
Co-Authors Ismiyati Pidianto Putra, Arif Ferdiansyah Sakti, Anjar Dimara Suci Rahmawati, Suci Tricahya, Fahmi Hermawan Ummul Habibah Hasyim Utami, Inggita