Treatment method of heavy metal pollution of soil in saline-alkali land

The invention belongs to the field of environmental protection soil pollution treatment, and particularly relates to a treatment method for heavy metal pollution of soil in saline-alkali land. The treatment method is used for repairing heavy metal polluted soil containing nickel, chromium (hexavalent), arsenic and copper; according to the method, by adopting combined use of mixed leacheate composed of tartaric acid and rhamnolipid and a mixed passivator composed of straw biochar, organic compost and polyacrylamide, combined use of a chemical leaching method and a passivation stabilizing methodis realized; and compared with the prior art, through the method, the activity of heavy metal ions can be effectively lowered for a long term, the soil quality is improved, secondary pollution is avoided, and the method is suitable for large-scale use and popularization. 本发明属于环境保护土壤污染治理领域，具体涉及一种盐碱地土壤重金属污染的治理方法，用于对含有镍、铬(六价)、砷、铜的重金属污染土壤进行修复，该方法通过采用由酒石酸、鼠李糖脂组成的混合淋洗液与由秸秆生物炭、有机堆肥和聚丙烯酰胺组成的混合钝化剂的联用，从而实现了化学淋洗法和钝化稳定法的联用，与现有技术相比，该