珠三角某河涌底泥各功能区污染特征与资源化利用分析

Analysis on Pollution Characteristics and Resource Utilization of Sediment in Various Functional Areas of a River in the Pearl River Delta

为了分析珠三角地区典型河涌底泥的污染特征并对其资源化利用于农业生产的可行性进行探究,以佛山市顺德区某镇为例,针对河涌所处不同环境功能区,依据《农用污泥污染物控制标准》(GB 4284—2018)对底泥污染特征进行分析。结果表明,该镇河涌底泥主要存在重金属砷、锌及矿物油污染,重金属污染程度为工业区>居民区>种养区,矿物油污染则是居民区>工业区>种养区。在农用标准的允许范围内,污染风险较小的种养区底泥改造后可用作农业生产中的园林绿化土、育苗基质、肥料等。

In order to analyze the pollution characteristics of typical river sediment in the Pearl River Delta region and explore the feasibility of its resource utilization for agricultural production,this paper took a town in Shunde District,Foshan City as an example,analyzed the pollution characteristics of sediment of the different environmental function areas where the river was located,according to the Agricultural Sludge Pollutant Control Standard(GB 4284-2018).The results showed that the sediment of the river in the town mainly contained heavy metal arsenic,zinc and mineral oil pollution.The degree of heavy metal pollution was ranked as industrial area>residential area>cultivation area,and the degree of mineral oil pollution was ranked as residential area>industrial area>cultivation area.Within the allowable scope of agricultural standards,the sediment of cultivation areas with less pollution risk could be remediated,and then used for agricultural production such as landscaping soil,seedling substrate and fertilizer.