Soil remediation and improvement method

The invention provides a soil remediation and improvement method which comprises the following steps: regulating and controlling a crystalline phase of a mineralized product biological calcium carbonate induced by bacillus pasteurii by using a biological surfactant, so that calcite is converted into vaterite. Preparing a biochar/magnesium ammonium phosphate composite material from the filtrate obtained after the biological calcium carbonate is prepared, the biochar activated by phosphoric acid, magnesium oxide and the like, and then sequentially applying the biological calcium carbonate and the biochar/magnesium ammonium phosphate composite material to the surrounding soil, polluted by harmful metal elements, of the mining area. The method is simple in process, low in cost and free of secondary pollution, and has the effects of repairing and improving the soil around the heavy metal/rare earth element polluted mining area. 本发明提供了一种土壤修复改良方法，包括利用生物表面活性剂调控巴氏芽孢杆菌诱导矿化产物生物碳酸钙的晶相，使其由方解石转变为球霰石。利用制备生物碳酸钙后的滤液与磷酸活化后的生物炭