Remediation method for heavy metal Cd and polycyclic aromatic hydrocarbon combined polluted soil

• Main Authors: LI GUIRONG, WANG ZONGSHUO, THE INVENTOR HAS WAIVED THE RIGHT TO BE MENTIONED, JIA SHENGYONG
• Format: Patent
• Language: Chinese; English
• Published: 15.05.2020
• Subjects: DISPOSAL OF SOLID WASTE; PERFORMING OPERATIONS; RECLAMATION OF CONTAMINATED SOIL; RECLAMATION OF CONTAMINED SOIL SOIL; TRANSPORTING

The invention provides a remediation method for heavy metal Cd and polycyclic aromatic hydrocarbon combined polluted soil, and belongs to the technical field of soil remediation. The method comprisesthe following steps: (1) calcining crop straws in the absence of oxygen to prepare charcoal for later use; (2) spreading biochar into soil, plowing the soil, then planting an enriched plant ryegrass in the soil, uniformly spreading 135 g of ryegrass seeds on the land with the planting density of 1 m , spreading a layer of thin soil, and watering to keep the water content of the soil at 55-65%. The method is applied to remediation of soil polluted by heavy metal Cd and polycyclic aromatic hydrocarbon pyrene, and particularly has a remarkable removal effect on pyrene in the soil. 本发明提供了一种重金属Cd和多环芳烃复合污染土壤的修复方法，属于土壤修复技术领域。该方法包括以下步骤：（1）将农作物秸秆隔绝氧气煅烧，制备生物炭，备用；（2）将生物炭撒入土壤中，对土壤进行翻耕，随后在土壤中种植富集植物黑麦草，种植密度为：1m的土地上均匀播撒135g的黑麦草种子，撒上一层薄土，浇水并保持土壤含水量在55%~65%。该方法应用于修复重金属Cd和多环芳烃芘复合污染的土壤，尤其是对土壤中的芘具有显著的去除效果。