以生活污泥、牛粪、蚓粪、菌菇渣、粉煤灰、脱硫石膏、钢渣和煤矸石8种固体废物为原料配置人工土壤,探讨不同有机和无机固体废物配比对人工土壤性质的影响。结果表明,获得的人工土壤中,粒级〉0.250mm的水稳性团聚体质量分数总体在20%~50%,接近或达到正常的自然土壤标准,制得的人工土壤为弱碱性,pH实测值在7.12~8.14。培养过程中,人工土壤中有机碳含量大大降低。生活污泥组、蚓粪组人工土壤在培养过程中呈现铵态氮向硝态氮的转化,而牛粪组人工土壤在培养过程中虽然有较多的有机氮被矿化,但同时也有较多的硝态氮被重新同化成有机氮。合成的人工土壤在物理、化学、养分和生物毒理学性质方面均已达到自然土壤相关参数的正常范围值,可以满足植物生长的要求。但由于部分固体废物原料重金属超标,则应尽量避免用于种植可食用类植物。
Artificial soil were synthesized with eight types of solid wastes (sewage sludge,cow dung,vermicom- post, mushroom residue, fly ash, gypsum, steel slag and coal gangue) as raw materials. Effects of different ratios of or- ganic and inorganic wastes on physical, chemical and biological properties of artificial soils were investigated. The re- sults showed that content of water stable aggregates with diameter of〉0.250 mm was generally ranged 20%-50% in artificial soils, closing to or meeting the normal standard of natural soil. The obtained artificial soil was weak alkaline with monitored pH of 7.12 8.14. During the process of incubation,content of organic carbon in artificial soils was sig- nificantly decreased. Ammonium-N was converted to nitrate N in the sewage sludge group and the vermicompost group. More organic nitrogen was mineralized in cow dung group and in the meantime more nitrate-N was assimilated into organic nitrogen. The physical, chemical, biological, nutrimental and toxicological characteristics of the artificial soil obtained in this experiment had reached similar range value of natural soil. The artificial soil could i-neet the re- quirements of plant growth,but considering the high content of heavy metals in some solid waste,the products should be avoided to be used for production of edible plants.