بازیافت پسماند لجنی و تهیه کمپوست از سیستم تصفیه کارخانه روغن خوراکی (مطالعه موردی،کارخانه گنجه رودبار)
محورهای موضوعی : کاربرد شیمی در محیط زیست
حسین رمضانی گنجه
1
,
زهره قاضی طباطبایی
2
1 - گروه مهندسی شیمی ، واحد اهر، دانشگاه آزاد اسلامی، اهر، ایران
2 - دانشگاه آزاد اسلامی - واحد اهر
کلید واژه: مدیریت پسماند لجنی, کمپوست, هوازی, نسبت کربن به نیتروژن.,
چکیده مقاله :
تولید کمپوست از پسماندهای لجنی تصفيه خانه های صنايع روغن خوراكي، به دلیل وجود مقادیر قابل توجهی بار آلی در لجن، یک روش مناسب جهت بازيافت و مدیریت پسماندهای لجنی میتواند باشد. در این تحقیق قابلیت تبدیل پسماند کارخانه گنجه رودبار به کمپوست با استفاده از سیستم کمپوست سازی در شرایط هوازی و برگرداندن سطحی توده انجام گرفت. پسماند کارخانه با 30 درصد کاه گندم برای تنظیم نسبت کربن به نیتروژن به صورت لایه لایه مخلوط شد و چند بار برای همگن شدن مخلوط زیر و رو گردید و در انتها توده ای فشرده با ابعاد 2 در 2 در 5/1 متر ارتفاع ایجاد گردید. فرکانس برگرداندن توده کمپوست جهت فرایند هوازی هر 4 روز یکبار بود. تغییرات دما، رطوبت، pH، هدایت الکتریکی و نسبت کربن به نیتروژن در طی روند کمپوست سازی به مدت 91 روز مورد پایش قرار گرفت و هر هفته یک بار نمونه گیری صورت گرفت. بررسی ها نشان داد توده کمپوست در روز 14 ام به بالاترین دما، 57 درجه سانتی گراد، رسید. سپس توده شروع به سرد شدن کرد و در آخرین روز پایش به دمای 23 درجه سانتی گراد رسید. رطوبت مواد در حین کمپوست سازی از8/65% به 3/29% در پایان تحقیق کاهش یافت. تغییرات pH از 43/6 به 78/7 رسید. نسبت کربن به نیتروژن از 21/30 با شیب ملایمی به عدد 74/19 کاهش یافت. نتایج این تحقیق نشان داد که توده ی کمپوست با موفقیت دوره ی گرمایی خود را طی کرده و نسبت کربن به نیتروژن در نمونه نهایی به حد مطلوب خود رسیده که حاکی از به بلوغ رسیدن توده کمپوست می باشد.
Production of compost from the sludge wastes of oil refineries, due to the presence of significant amounts of organic load in the sludge, can be a suitable method for recycling and management of sludge wastes. In this research, the ability to convert the waste of Ganjeh Rudbar factory to compost in aerobic conditions and return the surface of the mass was investigated. The sludge deposited in factory-treated wastewater was mixed with 30% wheat straw in layers to volume the waste and it adjust the carbon to nitrogen ratio. The mixture was stirred several times to homogenize. A mass with dimensions of 2 ⨯2 meters and a height of 1.5 meters was created. For aerobic process, the mass was returned every 4 days. The factors were monitored during the composting process for 91 days. During the composting process, changes in temperature, humidity, pH, EC and carbon to nitrogen ratio were monitored for 91 days and sampling was done once a week. Studies showed that the compost mass reached its highest temperature (57 °C) on the 14th day. The mass then began to cool, reaching a temperature of 23 ° C on the last day of monitoring. Humidity at the end of the study decreased from 65.8% to 29.3%. The carbon to nitrogen ratio decreased from 30.21 with a slight slope to 19.74 at the end of the study.The results of this study showed that the compost mass has successfully passed its heating period and the ratio of carbon to nitrogen in the final sample has reached its desired level, which indicates that the compost mass has matured.
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