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All Journal ASEAN Journal of Chemical Engineering JUARA: JURNAL WAHANA ABDIMAS SEJAHTERA
Siti Rozaimah Sheikh Abdullah
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Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Environmental Science Social Sciences

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Application of Evidence Theory to Automate The Process of Removing Toxic Chromium Ions in Wastewater Mohd Marzuki Mustafa; Siti Rozaimah Sheikh Abdullah; Rakmi Abdul Rahman
ASEAN Journal of Chemical Engineering Vol 5, No 1 (2005)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (619.91 KB) | DOI: 10.22146/ajche.50167

Abstract

A new method to automate the batch process of removing toxic chromium ions from wastewater using Oempster-Shafer's (OS) evidence theory is described. The removal of the toxic chromium ions from wastewater is a good example of a process where conventional output or state feedback controllers cannot be simply applied because the concentration of the ion cannot be easily measured online or estimated from other measured parameters. The batch process of removing toxic chromium ions by adding a reducing agent involves reduction and oxidation (redox) reactions which are usually monitored using the oxidation reduction potential (ORP) probe. However, the relationship between ORP and concentration of chromium ions is difficult to establish, hence, a reliable online control is seldom achieved using output feedback control. The approach here is to treat the sequence of ORP values obtained at each sample interval as partial evidences with different degrees of belief to indicate whether the removal process has been completed or not. Using OS's theory of evidence these partial evidences are fused or aggregated to give a more reliable and robust real time control decision. In this paper, a modification is proposed to overcome deficiencies in the OS's combination rule in combining sequences of evidence from the same source. The algorithm based on this evidence theory has been tested in the laboratory, and the results obtained show that the algorithm is robust with respect to noise and process variation.Keywords: Chromium removal process, Dempster-Shafer's evidence theory, evidence aggregation, information fusion, and oxygen reduction potential (CRP).
PENINGKATAN PENGETAHUAN ANGGOTA ASOSIASI KERAJINAN BATIK DI KABUPATEN JEMBER, JAWA TIMUR TENTANG PENGOLAHAN AIR LIMBAH INDUSTRI BATIK Yeny Dhokhikah; Noven Pramitasari; Firda Lutfiatul Fitria; Siti Rozaimah Sheikh Abdullah
JUARA: Jurnal Wahana Abdimas Sejahtera Volume 1, Nomor 2, Juli 2020
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1164.724 KB) | DOI: 10.25105/juara.v1i2.7398

Abstract

Industri batik di Indonesia merupakan industri dengan kategori industri skala besar, menengah, kecil, dan bahkan home industry atau skala rumah tangga. Selain memberikan manfaat secara ekonomi, industri batik juga menimbulkan dampak berupa dihasilkannya air limbah dari proses produksinya. Air limbah batik yang dihasilkan umumnya berasal dari proses pewarnaan, pencucian dan pelepasan malam. Limbah tersebut umumnya mengandung zat-zat pencemar yang kadarnya melebihi baku mutu. Salah satu zat pencemar pada limbah batik adalah zat warna. Zat warna pada air limbah batik dihasilkan dari sisa bahan pewarna pada proses pencucian dan pembilasan kain batik. Bahan pewarna yang biasa digunakan adalah bahan pewarna sintetik karena mudah menghasilkan warna-warna yang cerah. Bahan pewarna ini selain meningkatkan turbiditas air juga mengadung logam berat yang sangat berbahaya bagi kesehatan manusia. Oleh karena itu kegiatan Pengabdian kepada Masyarakat ini bertujuan untuk meningkatkan kesadaran perajin batik untuk mengolah air limbah batik yang dihasilkan sampai memenuhi baku mutu buangan limbah yang diperbolehkan untuk dibuang ke lingkungan. Adapun metode pelaksanaan kegiatannya adalah dengan memberikan sosialisasi untuk meningkatkan pemahaman anggota Asosiasi Perajin Batik Jawa Timur (APBJ) Kabupaten Jember berupa pemaparan metode dan contoh instalasi pengolahan air limbah batik.
Co-Authors Firda Lutfiatul Fitria Mohd Marzuki Mustafa Noven Pramitasari Rakmi Abdul Rahman Yeny Dhokhikah