CONTAMINATED SOIL CLEANING SYSTEM

This contaminated soil cleaning system is for decomposing a contaminant in a contaminated soil E, and comprises: a step for injecting, from a water injection well, into the contaminated soil, an injection liquid that includes a cleaning agent for decomposing the contaminant or an activator for activating biological decomposition exhibited by the cleaning agent; a step for measuring the concentration of the cleaning agent or the activator in underground water in an observation well or a pumping well provided to a place away from the water injection well; and a step for automatically controllingan added amount of the cleaning agent or the activator to the injection liquid or a pumping amount from the pumping well, on the basis of the measured concentration. 污染土壤净化系统是用于将污染土壤E内的污染物质分解的污染土壤净化系统，其中，其具备：从注水井向污染土壤注入含有将污染物质分解的净化剂或者使上述净化剂的生物性分解活化的活性剂的注入液的工序；对在与注水井分隔开的位置设置的观测井内或抽水井内的地下水中的净化剂或活性剂的浓度进行测定的工序；和基于所测定的浓度，自动控制净化剂或活性剂向注入液的添加量或者从抽水井的抽水量的工序。