海南岛河流底泥肥力和重金属污染特征及其风险评价

doi:10.16843/j.sswc.2017.03.017

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Abstract [Background] It is pointed in the governmental document of "Water Pollution Control Action Plan" that the water sediment after dredging and disposal, could directly eliminate the phenomenon of black smelly water. The dredged sediment utilization is the main way of land use, ecological restoration materials, construction materials, sewage treatment, etc. Hainan is a unique volcanic tropical island in China, nutrients and heavy metals in sediments formed by unique soil parent material have become the academic research priorities, and the reuse of river sediment can solve the problem of insufficient exogenous soil in land ecological remediation project. Characterization and evaluation is an important prerequisite for sediment resource utilization. In order to understand the characteristics of river sediment in the tropical basalt area of Hainan Island and the possibility of resource utilization, comprehensive and detailed understanding of river sediment heavy metal pollution status, nutrient level and ecological risk, for the river sediment dredging and subsequent resource disposal, is of great significance. [Methods] The typical river pond Tangliutang was selected as the research object, and the typical section distribution point in August 2015 was used. The heavy metals and fertility of 52 sediment samples were tested and evaluated by different evaluation methods. Data was statistically processed by SPSS 22. [Results] 1) According to the index of soil nutrient grading in the second national soil survey, the total nitrogen content in the sediment reached grade Ⅰ, the contents of total phosphorus, total potassium and organic matter were in grade Ⅱ, and the CEC (Cation Exchange Capacity) reached grade Ⅳ. The gray relational index of each fertility index was higher than that in the control area, which indicated that the nutrient of river sediment was fine. 2) Standard "Environmental Quality Evaluation Standards for Farmland of Edible Agricultural Products" (HJ 332-2006) was used to evaluate the heavy metal pollution of the sediment. The main pollutants were Cd and Hg, Cd exceeded the standard by 14% with 65.4% samples, and Hg exceeded the standard by 11% with 59.6% samples. 3) The evaluation results of geo-accumulative pollution index and comprehensive geo-accumulative pollution index (I_cgeo) showed that the main pollutants in the river sediment were Cd and Hg, while the river sediment was moderate pollution. 4) The evaluation of potential ecological risk index showed that Hg was the most important potential ecological risk factor. The sediment was at the level of "slight ecological hazard" according to comprehensive potential ecological risk index E_RI. [Conclusions] Under the situation of above results. Whether or not the sediment can be applied in land reuse is up to each practical case, for instance, it can be used for forest restoration but not for rice planting. This study provides a scientific basis and technical support for the ecological reconstruction and soil resource utilization of dredged sediment in the major land rehabilitation project of Nandu River ndu River in Hainan Province.

Key words： river sediment nutrient heavy metal pollution geo-accumulative pollution index evaluation potential ecological risk

Received: 02 November 2016

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	Articles by authors
	LIU Yongjie
	HU Zhenhua
	LIU Yongbing
	LI Xiang
	WANG Jiajia
	LUO Nan
	HONG Wenliang

Cite this article:

LIU Yongjie,HU Zhenhua,LIU Yongbing, et al. Fertility, heavy metal pollution characteristics of river sediment and the risk assessment in Hainan Island[J]. SSWC, 2017, 15(3): 131-138.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2017.03.017 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2017/V15/I3/131

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