Assessment of Physico-chemical, Microbial and Phytotoxic Changes of Various Organic Wastes During their Composting Process

Journal of Environmental and Agricultural Studies Pub Date : 2021-10-02 DOI:10.32996/jeas.2021.2.2.3

F. Ayed, O. Boussadia, Hanem Grissa, R. A. Abdallah, H. Jabnoun-Khiareddine, .. M.Daami-Remadi

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Abstract

In this study, the aerobic composting in windrows of five mixtures of organic materials was compared. Composting temperatures rose to 60-67°C within 7 to 22 days and stayed above 45°C for 4-5 months before declining. Decomposition after 223 days was 40-43% for organic materials and 23-25% for carbon. The pH values decreased during the composting process and became neutral at maturation. Electric conductivity dropped to 3.6-5.22 mS/cm after 170 days. Dry matter increase to 96.2-97.8% within 182 days of composting and dropped to 70.13-73.87% at maturation. Bulk density increased from 0.20-0.26 g/cm3 to 0.34-0.55 g/cm3 and varied depending on composts. Porosity and water retention decreased during composting. Nutrient contents varied over composting times and wastes. Composts' phytotoxicity, evaluated on barley (Hordeum vulgare L.) seeds, decreased by 0.2-13.2% and 63.2-81.3% after 30 and 220 days of composting, respectively. Benefits of composting organic wastes into agriculturally valuable final products was discussed.

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不同有机废弃物堆肥过程中理化、微生物和植物毒性变化的评价

在本研究中，比较了五种有机物混合物在窗内的好氧堆肥效果。堆肥温度在7 - 22天内上升到60-67℃，在45℃以上保持4-5个月后下降。223 d后有机物分解率为40-43%，碳分解率为23-25%。pH值在堆肥过程中逐渐降低，成熟后趋于中性。170天后，电导率降至3.6-5.22 mS/cm。干物质在182 d内增加到96.2 ~ 97.8%，成熟时下降到70.13 ~ 73.87%。堆积密度由0.20 ~ 0.26 g/cm3增加到0.34 ~ 0.55 g/cm3，堆积密度随堆肥的不同而变化。堆肥过程中孔隙率和保水率降低。养分含量随堆肥时间和废弃物的变化而变化。对大麦(Hordeum vulgare L.)种子进行植物毒性评价，堆肥处理30 d和220 d后，分别降低了0.2 ~ 13.2%和63.2 ~ 81.3%。讨论了将有机废物堆肥成具有农业价值的最终产品的效益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Environmental and Agricultural Studies

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