Study On Contaminated Land Suitability Evaluation For Reuse After Remediation

Population growth and social and economic development have made scarcity of land resources aggravation. It has two causes led to such a situation. Firstly, it due to natural causes. Secondly, it is artificial reasons. Phenomenon of land pollution exists widely and contaminated land quantity is a nonnegligible quantity. Land contamination reflects on deterioration of land quality and recession of land potential productivity, also harming ecological safety and human health, reducing the amount of available land.Using modern technology to remedy the contaminated land is a effective means for enhancing land quality, optimizing land resource, alleviating land problems. However, due to the toxicity of pollutants of contaminated land, there is risk for its reuse to some degree. Based on the protection of human health and the optimum land utilization, it should be carried out land suitability evaluation for contaminated land reuse after remediation.Researches on land suitability evaluation and remediation assessment of contaminated land (mainly about health risk assessment) were summarized in this paper. It point out that there are differences between contaminated land suitability evaluation after remediation and the general land suitability evaluation. It is lack of researches in this aspect and no perfect suitability evaluation system.The author holds that the critical factor to consider in contaminated land reuse after remediation is the risk on human health from residual pollutants in soil and groundwater. Health risk determines land-use pattern to some degree. Therefore, indices system for land suitability evaluation was established based on health risk assessment for contaminated land which has been renovated. It indicates the future land use modes of remedied land which providing scientific evidence for contaminated land reuse. Finally, this article makes and empirical study by taking Pu Jin Chemical Co Ltd site for example, and aiming at the assessment results giving advices for future land use patterns. This thesis key research is on land suitability evaluation theory and methods for contaminated land reuse after remediation.Conclusions of this study are as follows:(1)Health risk assessment for land plays basis role in land reuse. In order to fix on contaminated land use patterns after its remediation, it is necessary to estimate human health risk which brings by remainder pollutants of land after remediation. That means conducts a health risk assessment.(2) Reuse of contaminated land need to carry out health risk assessment, and different future land use patterns induce to different evaluation results. Health risk assessment under different land use patterns is one basis for optimizing land resource allocation.(3) Health risk assessment index system was constructed for contaminated land after land remediation in this artical, including the exposure index, toxicity evaluation index and risk assessment index.(4) There are differents between general land suitability evaluation and contaminated land suitability evaluation after remediation. Land suitability evaluation index system was constructed for contaminated land after land remediation in this paper. The key is to join a health risk assessment value which combining health risk assessment with land suitability evaluation.(5)Accroding to pollutants'toxicity, main contaminated zone and concentration of remainder pollutants of original Pu Jin Chemical Co Ltd site, a land suitability evaluation for future land use patterns which bases on a health risk assessment has been done in this paper. Land suitability evaluation shows that the land after remediation is suitable to business and industry in the future, not so suitable to resident in the future.