تأثیر کاربرد لجن فعال در تولید ورمی‌کمپوست از پسماندهای مزارع ذرت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی منابع طبیعی، دانشگاه تربیت مدرس، نور

2 دانشیار گروه مهندسی محیط‌ زیست، دانشگاه منابع طبیعی، دانشگاه تربیت مدرس، نور

3 دانشجوی دکترای مهندسی منابع طبیعی، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور

چکیده

در این پژوهش اثر تلقیح لجن فعال فاضلاب به پسماندهای آلی تولید شده در مزارع ذرت با هدف بررسی تغییرات مواد مغذی طی ورمی‌کمپوست، موردمطالعه قرار گرفت. از لجن فاضلاب به‌عنوان منبع باکتری‌های تثبیت کننده نیتروژن و محلول کننده فسفر در چهار سطح استفاده شد. تیمارها به‌مدت 30 روز، پیش‌کمپوست شده و سپس توسط لجن فاضلاب تلقیح شدند و به‌مدت 40 روز ورمی‌کمپوست شدند. نتایج بررسی نشان داد که عمل تلقیح این باکتری‌ها به بستر تولید ورمی‌کمپوست همراه با فعالیت کرم‌های خاکی، موجب تسریع فرایند تجزیه زیستی مواد آلی می‌شود. افزایش غلظت لجن فاضلاب از 0 تا6000 میلی‌گرم در لیتر، موجب کاهش میزان مواد آلی کل (از 76/32 به 91/29 درصد)، مواد جامد فرار (آلی) کل (از 85/49 به 02/48 درصد) و نسبت کربن به نیتروژن (از 59/19 به 06/16) و افزایش میزان نیتروژن کلدالی کل (از 68/1 به 87/1درصد)، نیترات (از 75/1476 به60/1699 میلی‌گرم در کیلوگرم)، میزان فسفر کل (از 66/1 به77/1 گرم در کیلوگرم) و هدایت الکتریکی (از 10/3 به48/3 میلی زیمنس بر سانتی‌متر) شد. نتایج نشان داد غلظت6000 میلی‌گرم در لیتر لجن فاضلاب در میان سایر تیمارها، اثرات مطلوب‌تری بر کیفیت ورمی‌کمپوست نهایی داشت. بنابراین، تکرارپذیری فرایند و کیفیت محصول نهایی، این امکان را فراهم می‌کند که از روش این آزمایش برای پژوهش‌هایی که در آن نیاز به کاهش جرم مخلوط زائدات کمپوست است، استفاده شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Application of Active Sewage Sludge on the Vermicomposting of Agricultural Waste

نویسندگان [English]

  • seyyedeh maryam kharrazi 1
  • Habibollah Younesi 2
  • Javad Abedini Torghabeh 3
1 Tarbiat Modares University
2 Tarbiat Modares University
3 Recycle Organization of Mashhad Municipality
چکیده [English]

In this experiment, active sewage sludge was inoculated in organic waste. The objective was to study its effect on nutrient dynamics during vermicomposting. Active sewage sludge, as a source of nitrogen fixing and phosphorous solubilizing bacteria, was added in four combinations to the vermicomposting substrate. Prior to inoculation with active sludge, the treatments were precomposted for 30 days and finally vermicomposted for 40 days. Results showed that inoculation of microorganisms in the substrate accompanied by earthworms’ activity enhances the organic waste biodegradation rate. Increasing sludge concentration from 0 to 6000 mg/l led to reduced Total Organic Carbon from 32.76 to 29.91%, Total Volatile Solids from 49.85 to 48/02%, and C/N ratio from 19.59 to 16.06 but increased Total Kjeldahl Nitrogen from 1.68 to 1.87%, nitrate from 1476.75 to 1699.60 mg/kg, Total Phosphorous from 1.66 to 1.77 g/kg, and Electrical Conductivity from 3.10 to 3.48 mS/cm. By increasing the concentration of sewage sludge, heavy metals content also increased significantly due to the enhanced organic matter biodegradation. Finally, the results showed that, among the treatments, the one with an active sewage sludge concentration of 6000 mg/l had more desirable effects on the final vermicompost quality. Based on the reproducibility of the process and the quality of the final products, this experimental procedure may be proposed for studies requiring a mass reduction in the initial composted waste mixtures.

کلیدواژه‌ها [English]

  • Microorganism
  • nutrients
  • Vermicompost
  • Organic Waste
  • Carbon Mineralization
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