Addition of wood sawdust during the co-composting of sewage sludge and wheat straw influences seeds germination
| Autor: | Hassiba Kebibeche, Meriem Kaid Harche, Omar Khelil, Mourad Kacem |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nitrogen
Health Toxicology and Mutagenesis Streptococcaceae 0211 other engineering and technologies Sewage Germination 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences Lepidium sativum Soil Enterobacteriaceae Escherichia coli Sanitation Kjeldahl method Soil Microbiology Triticum 0105 earth and related environmental sciences 021110 strategic defence & security studies Chemistry Compost business.industry Composting Brassica rapa Temperature Public Health Environmental and Occupational Health General Medicine Hydrogen-Ion Concentration Lettuce Straw Wood Pollution Carbon Horticulture visual_art Seeds engineering visual_art.visual_art_medium Phytotoxicity Sawdust business Sludge |
| Zdroj: | Ecotoxicology and Environmental Safety. 168:423-430 |
| ISSN: | 0147-6513 |
| Popis: | The objective of this study was to investigate the effect of addition of sawdust co-composted with sewage sludge and wheat straw on seeds germination. Two mixtures were piled and composted over 90 days. The first mixture (C1) was composed of sewage sludge and wheat straw, while the second mixture (C2) was composed of sewage sludge, wheat straw and wood sawdust. The results showed that the physicochemical parameters of both composts, i.e., temperature (> 55 °C in the thermophilic phase), moisture content (~ 30%). pH (6.73 for C1 and 7.19 for C2) and EC values (1.81 mS cm−1 for C1 and 1.32 mS cm−1 for C2) reached the required maturity standard. The values of C/N were below 12 indicating a high degree of maturity. Also, no bacterial pathogens were detected in the final composts. The concentration of total heavy metals has been reduced allowing the elimination of sewage sludge toxicity, confirmed by the germination index, which reached over 80%. Strong positive correlations were noticed between total Kjeldahl nitrogen of C2 and germination indexes of all the studied species. The obtained results indicate that the addition of wood sawdust increases the nitrogen content leading to slightly alkaline compost which influences seeds germination by reducing the phytotoxicity of sewage sludge. |
| Databáze: | OpenAIRE |
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