Danau di Universitas Hasanuddin atau Danau UNHAS telah mengalami pencemaran sehingga tidak dapat dimanfaatkan secara optimal. Kitosan dari limbah kulit udang Vannamei dari Kawasan Industri Makassar (KIMA) dapat digunakan sebagai bahan untuk proses penjernihan air. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi kitosan dan kecepatan pengadukan pada proses penjernihan air danau UNHAS. Metode yang digunakan adalah jar test, rapid mixing dan slow mixing dengan varian penambahan konsentrasi kitosan berturut-turut 0.5, 1, 1.5, 2, 2.5 (% berat) pada kecepatan putar pengadukan cepat berturut-turut 100, 300, 500, dan pengadukan lambat 70 rpm. Hasil penelitian menunjukkan bahwa kualitas air danau terbaik dari segi pH dicapai pada penambahan kitosan 0,5%, sedangkan dari segi TDS dan suhu, kualitas air terbaik diperoleh pada penambahan kitosan 2,5%. Kecepatan optimum pengadukan yang memberi kualitas air terbaik dari segi pH dan TDS adalah pada 500 rpm, sedangkan kecepatan optimum yang meberikan kualitas air dengan suhu terbaik diperoleh pada kecepatan 100 rpm. Secara umum, penelitian ini menunjukkan bahwa kitosan kulit udang memiliki potensi untuk digunakan sebagai koagulan untuk proses perbaikan kualitas air danau.
The lake in UNHAS is thought to have experienced pollution which causes the water quality to be poor so that it cannot be utilized at all. For that we need a way to improve water quality. In this study, a natural coagulant was used, namely chitosan from Vannamei shrimp shell waste from KIMA which from the past until now has not been optimally managed, so that it is an aspect that also needs attention. The method used was a jar test, through rapid mixing and slow mixing processes with variants of increasing the concentration of chitosan 0.5, 1, 1.5, 2, 2.5 (%) at stirring speed of 100, 300, 500, and 70 rpm. The results of the study, namely the effect of shrimp shell chitosan on lake water quality for TDS testing showed that, the more addition of chitosan which was parallel with the stirring speed, the solid content decreased so that the shrimp shell chitosan as a coagulant was indeed quite good to be used as an alternative to improve lake water quality in reducing solids content. Optimal at a stirring speed of 500 rpm with the addition of the concentration of chitosan as much as 10 ml / 2.5% to the volume of the lake water sample.
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