污水污泥裂解目标产物及残焦促进植物生长的研究

研究了污水污泥的低温裂解特性，考察了裂解终温和干燥到一定程度后污泥含水率对裂解产物分布及产物性质的影响，并分析了裂解产物中最合适的目标产物形式.经过分析比较，最终确定以污泥裂解残焦为目标产物并通过与普通土壤混拌进行了栽种大蒜和测试大蒜重金属浓度水平的实验,并考察残焦中重金属向植物迁移的情况.结果表明，干燥到一定程度的污水污泥在550℃下裂解时残焦的产率在40%以上，其中灰分含量在60%～65%之间，富含氮、 磷、 钾.该残焦中重金属含量符合有关土地使用规定，能明显促进大蒜植株的生长，实验组平均株高比普通组高出3～4　cm；但是快速生长的大蒜植株中重金属浓度略有增加.研究表明残焦是合适的污水污泥裂解目标产物，具有土地使用的前景，能够用于促进非食用目的的植物的生长.

Analysis on the Target Product from Sewage Sludge Pyrolysis and Experiments on Using the Char for Enhancing Plant Cultivation

Characteristics of sewage sludge pyrolysis under low temperatures were studied and the influences of reaction temperature and moisture content on products distribution and their properties were also investigated with a purpose to select a proper target product.After a dissective comparison,char produced from the pyrolysis process was chosen as the target product and then its effect on plant cultivation was checked by using it to plant garlic when blended into normal soil;also its heavy metals contents and t...