استفاده از ازن و كربن فعال گرانولي در تصفيه پساب صنايع الكل‌سازي

Application of Ozone and Granular Activated Carbon for Distillery Effluent Treatment

هدف از اين تحقيق، تصفيه پساب كارخانه‌هاي توليد الكل (ويناس) در فرايند تركيبي ازن و كربن فعال گرانوله (GAC) در سيستم پيوسته بود. سيستم پيوسته توسط ازن و كربن فعال گرانولي به‌تنهايي و در فرايند توام GAC/O3 براي تعيين ميزان اثر هم‌افزايي GAC و ازن بر حذف رنگ و COD ويناس حاصل از فرايند توليد آزمايشگاهي اتانول از ملاس نيشكر بررسي گرديد. آزمايش‌هاي پيوسته با ميزان ازن 240 ميلي‌گرم بر ساعت و در دماي محيط و ميزان دز GAC معادل 100 گرم انجام گرفت. كارايي ازن در حذف رنگ (74 درصد) بيشتر از حذف COD (25درصد) در شرايط بهينه بود. فرايند GAC/O3اثر هم‌افزايي بر حذف رنگ و COD ويناس نداشت، بلكه اثر منفي داشت كه البته اين اثر منفي با افزايش pH ويناس ورودي كاهش يافت. مطالعات نشان داد كه تغيير pH اثر زيادي در هر سه فرايند تصفيه دارد.

The main objective of this study was to investigate the treatment of distillery vinasse through the integrated process of ozone oxidation and Granular Activated Carbon (GAC) in a continuous process. The continuous process was carried out both by each of the GAC and ozone processes alone and by the combination of the two in order to investigate the synergistic effects of the two modes on COD and color removal in the treatment of vinasse from laboratory ethanol production from cane molasses. The continuous processes were performed at an ozone generation rate of 240mg/h, GAC dose of 100g, and at room temperature (25°C). Color removal efficiency of O3 was higher than its COD removal from vinasse. The COD and color removal efficiencies of the O3 process were about 25% and 74%, respectively. Moreover, GAC/O3 process was found to negatively affect the synergy of COD and color removal efficiency from distillery vinasse. This negative effect decreased by increasing influent pH level. The results indicate that the initial pH has a considerable effect on the three processes investigated.