基于污泥堆肥产物与余泥渣土制备的人工土壤的理化性质分析与评价

Analysis and evaluation of physical and chemical properties of the artificial soil based on sludge compost products and sludge mud residue

为实现污水厂污泥及余泥渣土的协同处理和资源化利用,以“两步法”制备人工土壤,考察不同配比条件对人工土壤理化性质的影响。结果表明:污水污泥与3种不同辅料(玉米秸秆、菌菇渣、木屑)配比后进行好氧堆肥,堆肥结束后腐熟度符合国家相关标准要求,将污泥堆肥产物和余泥渣土制备得到人工土壤,其理化性质与天然土壤类似。堆肥添加量能显著影响人工土壤水稳性团聚体、pH值、EC、有机质、总氮及有效磷含量,在人工土壤种植应用时,污泥+玉米秸秆的堆肥种植效果最好,采用改进的内罗梅综合指数法进行综合评价,综合考虑,污泥+玉米秸秆堆肥产物添加量为30%、余泥渣土添加量为70%和污泥+玉米秸秆堆肥产物添加量为50%、余泥渣土添加量为50%是最优质的人工土壤,污泥+木屑堆肥次之,污泥+菌菇渣堆肥效果最差。

In order to realize the synergetic treatment and resource utilization of sewage sludge and mud residue,this study prepared the artificial soil by "two-step method",and investigated the effect of different ratio conditions on the physical and chemical properties of the artificial soil.The aerobic composting was carried out with sewage sludge mixing with three different auxiliary materials(corn stalk,mushroom residue and wood chips) and the results showed that the maturity and heavy metal content after composting were in line with relevant national standards.The artificial soil was prepared by sludge composting and sludge residue,and its physical and chemical properties were similar to those of natural soil.The added amount of compost can significantly affect the water-stable agglomerates,pH value,electrical conductivity,organic matter,total nitrogen and available phosphorus of the artificial soil.In the application of artificial soil planting,the compost planting effect of corn stalk+sludge was the best.The improved Nemerow comprehensive index method was used for comprehensive evaluation.After comprehensive consideration,sludge+corn stalk compost product addition of 30%,residual sludge residue content of 70% and sludge+corn straw compost product addition of50%,residual mud residue addition of 50% are the best artificial soil,followed by sludge+wood chips compost,sludge+mushroom residue compost effect is the worst.