| 摘要 |
Although sewage sludges are excellent plant nutrients, they cannot be used as fertilizers in industrialized countries, in particular because of their heavy metal content. In the process disclosed, the dehydrated sewage sludge is placed in a sack together with hygroscopic materials, ingredients and microorganisms essential to plant growth and protection, and a seedling. The sack is then embedded in the ground. Contamination of the surrounding soil by heavy metals is thereby prevented. The process is also useful for cultivating arid regions. |
