Pencemaran lingkungan perairan olch pestisida cukup mengkhawatirkan dan pestisida tersebut di lingkungan bercampur dengan pestisida lain. Pengolahan air yang tercemar pestisida harus dilakukan supaya ridak mencemari sumber air minum. Karbofuran dan endosulfan dipilih sebagai model kontaminan untuk dis isihkan melalui ozonasi, karena insektisida tersebut masih digunakan, kandungannya rneningkat di lingkungan jika insektisida carbosulfan, benfuracarb, dan furathiocarb juga digunakan. Reaksi ozonasi selalu menggunakan 03 dan OH. keduanya oksidator kuat, O3 selektifitasnya tinggi dan oH kurang selektif. Ozonasi dcngan karbon aktif diharapkan dapat mendegradasi campuran endosulfan-karbofuran secara sempu rna. Tujuan penelitian yaitu mcndegradasi karbofuran dan endosulfan, khususnya; (1) mengetahui pengaruh reaksi hidrolisis terhadap laju degradasi carbofuran dan endosulfan pada ozonasi dengan dan tanpa karbon aktif (2) memahami fenomena degradasi karbofuran dan endosulfan tunggal dan campuran pada ozonasi dengan dan tanpa karbon aktif , terutama; (a) menemukan pengaruh degradasi campuran karbofuran-endoulfan terhadap laju degradasi karbofuran dan endosulfan dan (b) mencmukan peran karbon aktif pada degradasi karbofuran dan endosulfan. Percobaan dilakukan 4 tahap. Tahap I hidrolisis pada pH (5, 7, dan 9) karbofuran-endosulfan tunggal dan campuran, tabap ke-11 ozonasi karbofuran dan endosulfan tunggal pada pH (5, 7, dan 9) dengan dan tanpa karbon aktif, tahap III pengaruh suhu (20, 25 dan 30°C) pada ozonasi dengan dan tanpa karbon aktif,dan tahap IV identifikasi produk antara ozonasi campuran karbofuran dan endosulfan dengan dan tanpa karbon aktif pada pH 7 dan suhu 30°C dengan GC/MS. Kcsimpulan pengaruh hidrolisis cukup signifikan pada pcnyisihan karbofuran dan endosulfan terutama pada Kadar dan pH relatif besar. Fenomena degradasi karbofuran dan endosulfan yang terjadi yairu peran oksidasi oleh ozonasi jauh lebih besar dibandingkan terhadap hidrolisis. Ozonasi campuran karbofuran-endosu1fan dapat meningkatkan laju degradasi insektisida dibandingkan ozonasi secara tunggal, hal ini disebapkan adanya pecan hidrolisis campuran karbofuran-endosulfan. Penambahan karbon aktif pada ozonasi campuran karbofuran-endosulfan secara kenetika pengearuh idak signifikan terhadap laju degredasi reaktan awal dibandingkan peningkatan suhu. Namun demikian, karbon aktif berperan pada degredasi lanjut produk antara menjadi produk antara yang lebih sederhana, bersifat polar dan mudah terdegrasi secara alamiah. Dengan demikian, penambahan karbon aktif pada ozonasi dapat digunakan secara proses untuk detoksifikasi karbofuran dan endosulfan.The environtmental pollution by pesticide is relatively worrying as it is mixed with other pesticides. The treatment of water by pesticide must be done to avoid drinking water pollution. Carbofuran & endosulfan are choosen as contaminants model to be removal by ozonation since those insecticides still used, and their content in environment will increase if carbosulfan, benfuracarb, and furathiocarb also used. Ozonation reaction always performed using 03 and 'OH, as they are strong oxidator, high selectivity and OH has low selectivity. Ozonation with activated carbon hope fu lly can degrade the carbofuran-endosulfan mixtures. The aim of this research is to degrade carbofuran - endosulfan by ozonation, especially (1) to the effec of hidrolysis reaction between carbofuran and endosulfan with and without activated carbon, (2) to understand the phenomenon of degradation carbofuran and endosulfan in ozonation with and without activated carbon especially: (a) effect degradation of carbofuran-endosul fan mixtures to the rate of degradation carbofuran and endosulfun respetively, (b) the role of activated carbon in degradation of car bofuran and endosulfan. The experiment was performed in four stages. Firstly, hydrolysis of carbofuran, endosulfan and carbofuran-endosulfan mixtures at different pH condition (5, 7, and 9). secondly, ozonation of carbofuran, endosulfan and carbofuran-endosulfan mixtures at different pH condition with and without activated carbon. Thirdly ozonation with and without at different temperature (20, 25, and 30°C) with and without activated carbon and the last stage was product identification in the ozonation of carbofuran-endosulfan mixtures with and without activated carbon at pH 7, temperature 300C using GC/M S. In conclusion, the effect of hydrolysis is significantly enough at the removal of carbofuran and endosulfan especially at high concentration and high pH condition. The phenomenon of degradation carbofuran-endosulfan occurred is caused by the role of the oxidation by ozon compared to the hydrolysis. Ozonation of carbofuran-endosulfan mixtures can increase the rate of degredation of insecticide compared to single insecticide ozonation. This is because the effect increasing hydrolysis rate of carbofuran-endosulfan mixture. In the kinetic point the addition of activated carbon in ozonation is not significantly effect to the rate of degradation in initial reactant compared to the increasjng temperature. However, The activated carbon plays a role ini the degradation of complex intermediate to simple intermediate, it is easy a polar chemical and it to degrade of naturally. The addition of activated carbon in ozonation can be used as a carbofuran and endosulfan detoxification process in water.