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ارزیابی هضم مشترک و پیشتیمار بر تخریب‌پذیری زیستی سوبسترای لیگنوسلولزی و تولید متان در راکتورهای مزوفیلیک ناپیوسته | ||
| نشریه محیط زیست طبیعی | ||
| دوره 75، شماره 4، آبان 1401، صفحه 652-666 اصل مقاله (880.98 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jne.2022.333931.2332 | ||
| نویسندگان | ||
| ترحم مصری گندشمین* 1؛ منصور احمدی پیرلو1؛ غلامحسین شاه قلی1؛ امیرحمزه فرج الهی2 | ||
| 1گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران | ||
| 2گروه مهندسی هوافضا، دانشگاه افسری امام علی (ع)، تهران، ایران | ||
| چکیده | ||
| مطالعة حاضر با هدف بررسی هضم مشترک و اثرات شرایط پیشتیمار قلیایی بر تخریب پذیری سوبسترا و تولید متان از پسماندهای شهری و لجن فاضلاب به‌صورت پایلوت و با رویکرد تجربی در راکتورهای ناپیوسته و با زمان ماند 30 روز انجام شد. برای این منظور، بخش آلی پسماندهای شهری و لجن فاضلاب با 5 نسبت اختلاط مواد اولیه برای ارزیابی تولید بیوگاز و متان و با شرایط دمایی مزوفیلیک (C° 37) مورد بررسی قرار گرفت. نتایج نشان داد که افزایش لجن فاضلاب (تا 40 درصد وزنی مواد اولیه) در سوبسترا منجر به افزایش عملکرد متان شد، در حالی که زمان ماند طولانی تر با افزایش درصد پسماند شهری به دست آمد. بنابراین، نسبت پسماندهای شهری (60 درصد) و لجن فاضلاب (40 درصد) (60:40) به‌عنوان نسبت ترجیحی برای تولید بیوگاز بهینه تعیین شد. بر اساس نسبت ترجیحی، اثر غلظت های مختلف پیشتیمار قلیایی (2، 6 و 10 درصد NaOH) برای دوره های زمانی مختلف (1/5، 3 و 6 ساعت) بر تخریب پذیری زیستی پسماندها شهری، تولید بیوگاز و متان ارزیابی شد. نتایج نشان داد که بهترین بهبود با تیمار در غلظت 6 درصد NaOH و به مدت 3 ساعت بود که منجر به بهبود 26/4درصدی در تولید متان شد. سایر تیمارها نیز مؤثر بودند، که در آن تیمار 6 درصد NaOH به‌مدت 1/5 ساعت منجر به بهبود 14/3درصدی عملکرد متان در مقایسه با نمونة شاهد شد. بنابراین، پیشتیمار قلیایی به‌طور قابل توجهی باعث بهبود تجزیه پسماند آلی شده و در نتیجه تولید متان افزایش می یابد. | ||
| کلیدواژه‌ها | ||
| پیشتیمار؛ پسماند شهری؛ مزوفیلیک؛ نسبت اختلاط؛ هضم بی‌هوازی | ||
| عنوان مقاله [English] | ||
| Evaluation of co-digestion and pretreatment on lignocellulosic substrate biodegradability and methane production in non-continuous mesophilic reactors | ||
| نویسندگان [English] | ||
| Tarahom Mesri Gundoshmian1؛ Mansour Ahmadi-Prlou1؛ GholamHossein Shahgholi1؛ Amirhamzeh Farajollahi2 | ||
| 1Department of Biosystems Engineering, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran | ||
| 2Department of Aerospace Engineering, Imam Ali University, Tehran, Iran | ||
| چکیده [English] | ||
| This research aimed to investigate co-digestion and the effects of alkaline pretreatment conditions on substrate degradability and methane production from municipal solid waste (MSW) and sewage sludge (SS) in a pilot and experimental approach in non-continuous reactors with a retention time of 30 days. For this purpose, co-digestion of the organic fraction of MSW and SS with 5 mixing ratios of raw materials was evaluated to evaluate the biogas and methane production from it in with mesophilic temperature conditions (37 °C). Therefore, the results showed that the increase of SS (up to 40% by weight of raw materials) in feed led to increased methane yield, while longer retention times were obtained by increasing the percentage of MSW. So, the ratio of MSW (60%) and SS (40%) (60:40) was determined as the preferred ratio for optimal biogas production. Based on the preferred ratio, the effect of different concentrations of alkaline pretreatment (2, 6 and 10% NaOH) for different time periods (1.5, 3 and 6 hours) on the biodegradability of MSW, biogas and methane production was evaluated. The results showed that the best improvement was with the treatment at a concentration of 6%NaOH for 3 hours, which led to a 30% improvement in methane production. Other treatments were also effective, in which 6%NaOH treatment for 1.5 hours resulted in a 17% improvement in methane yield compared to the control sample. Therefore, alkaline pretreatment significantly improves the decomposition of solid organic waste and thus increases methane production. | ||
| کلیدواژه‌ها [English] | ||
| Pretreatment, Municipal waste, Mesophilic, Mixing ratio, Anaerobic digestion | ||
| مراجع | ||
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