<![CDATA[Abstrak: Telah dilakukan penelitian tentang degradasi intensitas zat warna air gambut dengan fotokatalis ZnO. Penelitian ini meliputi proses pre-treatment dengan koagulasi dan post treatment dengan penentuan jumlah optimum fotokatalis ZnO, pH optimum dan konstanta laju reaksi (k). Hasil penelitian menunjukkan bahwa proses pre-treatment menggunakan koagulasi dengan koagulan aluminium sulfat pada dosis 110 ppm dan pH 6,5 dengan persentase penyisihan kekeruhan, warna dan TSS, masing-masing 89%, 78% dan 98%. Pada proses fotokatalis menunjukkan bahwa kondisi optimum proses degradasi intensitas zat warna pada air gambut memerlukan 0,5 g/L katalis ZnO, pH 4 dan wakti radiasi sinar UV selama 120 menit. Konstanta laju fotodegrdasi intensitas zat warna sebesar 0,0209 menit-1 dengan persentase degradasi sebesar 20,54 %. Air gambut sebelum perlakuan memiliki konsentrasi intensitas zat warna sebesar 527 Pt.Co dapat disisihkan menjadi 10 Pt.Co dengan kombinasi koagulasi dan fotokatalis ZnO. Kata kunci: Air Gambut, Aluminium Sulfat, Fotokatalis, Koagulasi, ZnO Abstract : Has done research on the degradation of color substances in peat water with photocatalysts ZnO. This study includes pretreatment process with coagulation and post treatment to determine the optimum dose of ZnO photocatalyst, optimum pH and the reaction rate constant (k). The result showed that the pretreatment process using coagulation with Al2SO4 at 110 ppm dose, and pH 6,5 with the percentage of removal for turbidity, color and TSS are 89%, 78%, and 98%, respectively. Photocatalysts process showed that the optimum condition of color substance degradation in peat water requires 0,5 g/L ZnO, pH 4 and UV radiation for 120 minutes. Photodegradation rate constant of 0,0209 min-1 and the percentage of degradation is 20,54%. The peat water before treatment has color substance concentration can be set aside for 527 Pt.Co to 10 Pt.Co with the combination of coagulation and ZnO photocatalyts process. Key words: Aluminum Sulfate, Coagulation, Peat Water , Photocatalyst, ZnO]]>
