تأثیر اندازه و فعال‌سازی شیمیایی بیوچار بر زیست‌فراهمی برخی فلزات سنگین در کمپوست مشترک پسماند جامد شهری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران

2 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران.

چکیده

بیوچار به‌منظور کاهش اثرات نامطلوب فرایند کمپوست‌شدن و ارتقای کیفیت کمپوست نهایی مورد استفاده قرار می‌گیرد. در این پژوهش بخش آلی پسماند جامد شهری با بیوچار 2 تا 4 میلی‌متر B2-4mm))، بیوچار 1 تا 2 میلی‌متر B1-2mm))، بیوچار 5/0 تا 1 میلی‌متر B0.5-1mm))، بیوچار فعال‌شده با H2SO4 (AB0.5-1mm-H2SO4) و NaOH (AB0.5-1mm-NaOH) برای تهیه کمپوست مشترک مخلوط شد. نتایج نشان داد که فعال‌سازی شیمیایی بیوچار با تخریب سطح بیوچار باعث ایجاد سطوح ناهموار و ساختار نامنظم شد. در کمپوست مشترک حاصله بالاترین دما ( oC 5/71)، طولانی‌ترین دوره ترموفیلی (7 روز)، بیشترین شاخص جوانه‌زنی (131%) و درصد نیتروژن کل (37/1%) مربوط به AB-NaOH 5% و بالاترین غلظت ماده آلی (38%)، مربوط به B1-2mm 10% بود. در کمپوست نهایی تیمار AB-H2SO4 10% دارای کمترین غلظت روی و منگنز، تیمار B1-2mm 10% دارای کمترین غلظت آهن و سرب و تیمار AB-NaOH 10% دارای کمترین غلظت کادمیوم بود (p<0.05) . بر اساس حد مجاز فلزات سنگین در استاندارد ملی ایران، غلظت Fe، Zn، Mn، Cu، Pb و Cd در کمپوست‌های تولید شده در این تحقیق کمتر از حد مجاز بودند. اما تیمار شاهد از نظر غلظت کل و غلظت فلزات سنگین عصاره‌گیری‌شده با DTPA دارای بیشترین مقدار بود. در نهایت چنین نتیجه‌گیری می‌شود که چون افزودن بیوچار به‌ویژه بیوچار فعال‌شده و بیوچار در اندازه کوچک‌تر (5/0 الی 2 میلی‌متر) به پسماند جامد شهری در حال کمپوست‌شدن باعث کاهش غلظت کل و غلظت زیست‌فراهم فلزات سنگین می‌شود، لذا توجه به موضوع کمپوست مشترک و تحقیقات بعدی حائز اهمیت است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Biochar Particle Size and Chemical Activation on the Bioavailability of Some Heavy Metals in Co-Compost of Municipal Solid Waste

نویسندگان [English]

  • kamal khalkhal 1
  • Adel Reyhanitabar 2
  • Shahin Oustan 2
  • Nasser Aliasgharzad 1
1 Department of Soil Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
2 Department of Soil Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
چکیده [English]

Biochar is commonly used to mitigate the adverse effects of the composting process and enhance the quality of final co-compost product. In this research, municipal solid waste (MSW) was mixed thoroughly biochar of particle sizes (B2-4mm, B1-2mm, B0.5-1mm), and activated biochars (H2SO4-AB0.5-1mm and NaOH-AB0.5-1mm) and co-composted. Results demonstrated that chemical activation of biochar, which involved surface degradation, created rougher and more irregular structures. In co-composting, NaOH-AB (5%) showed the longest thermophilic period (7 days), the highest temperature (71.5°C), total nitrogen content (1.37%) and germination index (131%). The highest organic matter content (38%) was recorded in B1-2mm (10%). Among the biochar treatments, special attention should be given to the H2SO4-AB (10%) treatment due to its lowest Zn and Mn concentrations, the B1-2mm (10%) treatment for having the lowest Fe and Pb concentrations, and the NaOH-AB (10%) treatment for exhibiting the lowest Cd concentration in final co-compst (p < 0.05). Based on the permissible limits for heavy metals established by the national standard of Iran, the concentrations of Fe, Zn, Mn, Cu, Pb, and Cd in the composts produced in this study were all below the allowable limits. However, the control exhibited the highest total and DTPA-extractable HM concentrations. Overall, the addition of biochar, especially activated biochar (H2SO4-AB and NaOH-AB) and those with smaller particle sizes (0.5-2 mm), led to a reduction in both total concentration and bioavailability of HMs. In conclusion, the addition of biochar—particularly activated biochar and smaller particle sizes (0.5–2 mm)—to MSW during composting reduces both the total and bioavailable concentrations of HMs. Therefore, further research on co-composting and its implications is of great importance.

کلیدواژه‌ها [English]

  • biochar
  • co-composting
  • heavy metals
  • bioavailability
  • municipal solid waste

EXTENDED ABSTRACT

 

Introduction

Municipal solid waste (MSW) management is a global concern due to the continuous increase in MSW generation driven by industrialization and population growth. Without urgent intervention, MSW production is projected to reach 3.8 billion tons by 2050. The environmental impacts of illegal dumping or improper management of MSW include climate change, biodiversity loss, and contamination of air, water, and soil. Therefore, effective MSW management-aimed at minimizing waste generation, maximizing reuse, recycling, composting, and utilizing environmentally friendly alternative materials-must be rigorously implemented. Composting is of interest in various waste management strategies due to its low operating costs as well as social and environmental benefits. However, compost production and application face challenges such as greenhouse gas emissions (CH4, CO2, and N2O), odor generation, nitrogen loss, and contamination of water and soil resources with heavy metals. To mitigate these negative effects and improve compost quality, the use of additives such as biochar at the initial stage of composting-known as co-composting-has been proposed. This study aims to investigate the effects of biochar particle size and its activation by NaOH and H2SO4 on the mobility of macronutrients and heavy metals in MSW compost with a low initial C/N ratio.

Materials and methods

MSW was collected from the Municipal Waste Management Organization, Tabriz, Iran. The waste biomass for the production of biochar, was prepared by mixing the pruning branches of plum and pomegranate trees. Biochar was produced by slow pyrolysis at 400 °C with a heating rate of 10 °C per minute and a one-hour holding time at the target temperature. The biochar was separated using 0.5-1 mm (B0.5-1 mm), 1-2 mm (B1-2 mm), and 2-4 mm (B2-4 mm) sieves. For biochar activation, the biochar (B0.5-1mm) was activated with solutions of 2M NaOH and/or H2SO4 at a solid-to-solution ratio of 1:2 (w/v) with gentle stirring for 2 hours. In this research, the MSW were mixed thoroughly with different-sized biochars (B0.5-1mm, B1-2mm and B2-4mm) and activated biochars (NaOH-AB and H2SO4-AB) and co-composted for 90 days until compost maturity. The biochar properties were analyzed using various techniques, including CHNS, FTIR and SEM, while the co-compost samples were subjected to some physicochemical analyses. Repeated measures ANOVA was used for the statistical analysis.

Results

The results revealed that the activation of biochar with NaOH and H2SO4 solutions caused the appearance of a mesh structure with irregularly sized cavities and deep pores by modifying the biochar surface structure. The activation of biochar with NaOH and H2SO4 compared to biochar each produced a peak of approximately 1260 to 1270 cm-1 related to the presence of C-O in aryl esters (aromatic structure). On the other hand, H2SO4-AB produced a peak of approximately 1384 cm-1 compared to NaOH-AB and NAB (related to the presence of C-H in CH2 or CH3 (aliphatic structure)). In co-compost, NaOH-AB (5%, w/w) showed the highest temperature (71.5°C), the longest thermophilic period (7 days), total nitrogen content (1.37%) and germination index (130.9%). The highest organic matter content (OM) (37.9%) was recorded in B1-2mm (10%, w/w). Among the biochar treatments, special attention should be given to the H2SO4-AB (10%) treatment due to its lowest Zn and Mn concentrations, the B1-2mm (10%) treatment for having the lowest Fe and Pb concentrations, and the NaOH-AB (10%) treatment for exhibiting the lowest Cd concentration (p < 0.05). In this research, biochar particle size had no significant effect on the temperature of compost in the thermophilic phase (P>0.05).

Conclusion

Based on the permissible limits for heavy metals in the national standard of Iran, the composts produced in this study contained heavy metal concentrations below the allowable limits. However, the control treatment exhibited the highest total and DTPA-extractable heavy metal concentrations. High-quality co-compost was produced through the incorporation of 10% biochar rather than 5% biochar (w/w). The addition of biochar, especially activated biochar (H2SO4-AB and NaOH-AB) and biochar with smaller particle sizes (0.5 to 2 mm), led to a reduction in both the total concentration and bioavailable of heavy metals. Therefore, further research on co-composting and its implications is of great importance.

Author Contributions

Kamal Khalkhal: Conceptualization, Methodology, Software, Validation, Formal analysis, Investigation, Resources, Data Curation, Writing - Original Draft, Writing - Review and Editing. Adel Reyhanitabar: Conceptualization, Validation, Resources, Supervision, project administration, funding acquisition, Writing - Review and Editing. Shahin Oustan: Supervision, Validation, project administration, Writing - Review and Editing. Nasser Aliasgharzad: Supervision, Validation, Writing - Review and Editing.

Data availability

 Data will be available based on request from the authors.

Acknowledgments

This paper is published as a part of a Ph.D. dissertation supported by the Vice Chancellor for Research and Technology of the University of Tabriz, Iran. We thank Dr. Mohammad Moghaddam Vahed Professor of the Department of Plant Biotechnology and Breeding at University of Tabriz for his help in statistical analysis.

Funding.

This work is based upon research funded by the Iran National Science Foundation (INSF) under project No. 4004390.

Ethical considerations

The authors avoided data fabrication, falsification, plagiarism, and misconduct.

Competing interests

The author declares no conflict of interest.

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تحقیقات آب و خاک ایران
دوره 56، شماره 7
مهر 1404
صفحه 1967-1986

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