广州垃圾填埋场周围水体中PAHs和PAEs的污染特征

The characteristics of polycyclic aromatic hydrocarbons and phthalate esters in the water around landfills of Guangzhou city

目前填埋处置仍是城市生活垃圾处理的主要措施之一,而填埋处置产生的垃圾渗滤液可能对填埋场周围水体产生有机物污染.以广州的李坑和兴丰2个代表性的垃圾填埋场为对象,调查垃圾渗滤液中多环芳烃(PAHs)和邻苯二甲酸酯(PAEs)的浓度水平以及周围水体的污染特征.结果表明,李坑和兴丰2个填埋场渗滤液中的PAHs和PAEs的浓度高,∑PAHs和∑PAEs平均值分别为417和180μg·L^(-1).周围水体样品中均检出PAHs和PAEs,其中∑PAHs浓度为1.4~2.8μg·L^(-1),平均值为2.0μg·L^(-1);∑PAEs浓度为1.1~7.4μg·L^(-1),平均值为2.4μg·L^(-1).地下水体中的PAHs和PAEs的浓度沿地下水流动方向降低.填埋场周围地表水、地下水和渗滤液中的PAHs和PAEs成分组成特征和变化规律表现出较好的一致性,揭示了3者的同源性.

Landfill is regarded as one of the main approach for municipal solid waste treatment for its mature technology and economy all over the word. However, the landfill sites will produce leachates which contain abundant organic pollutants and may cause serious pollution to water around the Landfill. Two landfills--Likeng and Xingfeng in Guangzhou city were chosed for investigating. By analyzing the content and distribution of two typical persistent organic pollutants-- polycyclic aromatic hydrocarbons and phthalate esters in leachate, surface and underground water around the landfill sites, their pollution characteristics were estimated. The results showed that the concentration of ∑ PAHs and ∑ PAEs in all the leachate samples was high and with mean values of 417 μg·L^-1 and 180 μg·L^-1 respectively. PAHs and PAEs were detected in all the water samples taken from the Likeng and Xingfeng landfills. The concentration of ~ PAHs was 1.4 ~ 2. 8 μg·L^-1,with mean value of 2. 0 μg·L^-1. The concentration of ∑ PAEs was 1.1 - 7.4μg·L^-1, with mean value of 2.4μg·L^-1. The concentration of ∑ PAHs and ∑ PAEs in underground water decreased as they moved away from the landfill sites. The similar characteristics of constituents and changes in PAHs and PAEs in surface water, under- ground water and the leachates indicated that these organic pollutants came from the same source.