نوع مقاله : مقاله پژوهشی

نویسندگان

1 صنعتی اصفهان

2 دانشگاه صنعتی اصفهان

چکیده

در این تحقیق برای اولین بار، عملکرد رس سپیولیت فعال‏شده با اسید در شفاف‏سازی آب‏سیب مورد بررسی قرار گرفت. از روش آماری سطح پاسخ جهت یافتن شرایط بهینه فرایند شفاف‏سازی استفاده شد و میزان کدورت آب‏سیب به‌عنوان پاسخ در نظر گرفته شد. سپس در شرایط بهینه، کارایی سپیولیت، بنتونیت و ترکیب این عوامل شفاف‏کننده با ژلاتین و کیزل‏ژل جهت شفاف‏سازی آب‏سیب مورد ارزیابی قرار گرفت. نتایج نشان داد که افزایش غلظت رس سپیولیت از 1/0 به 05/0 درصد وزنی/ حجمی، سبب افزایش کدورت آب‏سیب شد. در دو دمای 50 و 60 درجه سانتی‏گراد، بیشترین میزان کاهش کدورت مشاهده شد و با افزایش زمان فرایند تا 7 ساعت، میزان کدورت به‌صورت منحنی درجه دوم کاهش یافت. شرایط بهینه شفاف‏سازی، غلظت رس 05/0 درصد، دمای 50 درجه‏سانتی‏گراد و زمان 7 ساعت بدست آمد. نتایج نشان داد که دو تیمار ترکیب سپیولیت- ژلاتین-کیزل‎ژل و بنتونیت- ژلاتین- کیزل‎ژل فعال‏ترین عوامل شفاف‏کننده هستند و قادرند کدورت آب‏سیب را به میزان 7/99 درصد کاهش دهند. مطالعات کینتیکی نشان داد که سرعت تغییرات در کدورت، ویسکوزیته، میزان ترکیبات فنولیک کل و رنگ طی زمان شفاف‏سازی به ترتیب از مدل های کینتیکی درجه یک، صفر، یک و صفر تبعیت می‏کنند.

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