https://journal33.ar-raniry.ac.id/lingkar <p><strong>Frequency: </strong>2 issues per year (June and December)<strong><br>Language: </strong>Indonesian &amp; English<strong><br>E-ISSN: <a href="https://issn.brin.go.id/terbit/detail/20230320051236820" target="_new">2986-8807</a><br>P-ISSN: <a href="https://issn.brin.go.id/terbit/detail/1594911174" target="_new">2746-2498</a><br>Editor in Chief:</strong> <a href="https://scholar.google.co.id/citations?user=He30q50AAAAJ&amp;hl=id" target="_new">Aulia Rohendi, S.T., M.Sc.</a><strong><br>Managing Editor: </strong><a href="https://scholar.google.co.id/citations?hl=id&amp;user=yjFXrqgAAAAJ" target="_new">M. Faisi Ikhwali, S.T., M.Eng.</a><strong><br>Publisher:</strong> <a href="http://ptl.uin.ar-raniry.ac.id/index.php/id" target="_new">Dept. of Environmental Engineering</a>, UIN Ar-Raniry Banda Aceh<br><strong><em>Lingkar: Journal of Environmental Engineering</em></strong> is a distinguished biannual, double-masked, peer-reviewed journal spotlighting Environmental Engineering and Science advancements. With a broad scope encompassing&nbsp; <strong><em>water and waste management</em></strong>, <em><strong>s</strong><strong>olid waste solutions</strong></em>, <em><strong>air pollution</strong></em>, <em><strong>pollution control</strong></em>, <em><strong>remediation</strong></em>, <em><strong>environmental management</strong></em>, <em><strong>sustainability</strong></em>, <em><strong>energy</strong></em>, <em><strong>green technologies</strong></em>, and <em><strong>HSE</strong></em> (<em><strong>Health, Safety, and Environment</strong></em>) considerations, Lingkar remains at the discipline's cutting edge.<br>The journal is deeply committed to pioneering change and contributes significantly to advancing knowledge in environmental engineering and its related fields. Beyond publishing incisive research results and insightful review articles, <em><strong>Lingkar</strong></em> is a platform for researchers, scholars, and practitioners to exchange insights and explore innovative solutions for addressing environmental challenges. <em><strong>Lingkar</strong></em> serves as a repository of knowledge and a catalyst for change, bridging the environmental knowledge gap and fostering a sustainable and informed future.</p> Department of Environmental Engineering (Prodi Teknik Lingkungan), Fakultas Sains dan Teknologi, UIN Ar-Raniry Banda Aceh en-US Lingkar: Journal of Environmental Engineering 2746-2498 https://journal33.ar-raniry.ac.id/lingkar/article/view/4421 <p><em>Pollution of dug well water in Gampong Jawa Banda Aceh is caused by an imbalance in the ecosystem of organic and inorganic pollutants. The purpose of this study was to determine the effect of chitosan biocoagulant as a dug-well water purifier. The stages of this research were making chitosan from shrimp shells, making chitosan biocoagulant with the addition of 1% CH₃COOH, and coagulation and flocculation with various biocoagulants (0.1%, 0.2%, and 0.5%) using the jar test method with fast stirring at 150 rpm and slow stirring at 50 rpm. The results of FTIR research on chitosan were characterized by the loss of the C=O group in the deacetylation process to change the acetyl amino group in chitin to amino, with a degree of deacetylation of 93.27%. The optimum performance of biocoagulants at a concentration of 0.5% can reduce pH from 7.1 to 6.9, the turbidity level to 99.99% (NTU), and E. coli to 0 jml/mL. The conclusion from this study is that chitosan biocoagulants are able to reduce turbidity levels (NTU), pH, and Escherichia coli bacteria.</em></p> Reni Silvia Nasution Febrina Arfi Alfan Ferdiansyah Alhafiz Khairun Nisah Copyright (c) 2024 Reni Silvia Nasution, Febrina Arfi, Alfan Ferdiansyah Alhafiz, Khairun Nisah https://creativecommons.org/licenses/by-sa/4.0 2024-08-14 2024-08-14 5 1