净水厂污泥中多环芳烃和金属的分布特征

来源期刊:中南大学学报(自然科学版)2015年第1期

论文作者:孙敏 周园

文章页码:366 - 372

关键词:净水厂;污泥;多环芳烃;金属

Key words:drinking water plant; sludge; PAHs; metal

摘    要:以南京市某净水厂的沉淀池、滤池污泥为研究对象,采用Udden-Wentworth标准将净水厂污泥粒径分为4级,即<3.9 μm,3.9~63 μm,63~250 μm和>250 μm。3.9~63 μm粒径的污泥分别占沉淀池和滤池污泥总体积的55%和73%;滤池污泥的有机质含量比沉淀池的高,在各粒径组分中的含量范围分别为12.64%~15.11%和8.09%~ 10.27%;沉淀池和滤池污泥中共检出14种多环芳烃,总质量分数平均值分别为556.59 ng/g和468.44 ng/g,其中2环和3环PAHs的质量分数之和为4环和5环的2~3倍,PAHs在各粒径组分中的质量分数分布与有机质的质量分数分布一致,PAHs在>250 μm和<63 μm的粒径组分中的质量分数较高,在63~250 μm粒径组分中质量分数相对较低;污泥粒径和有机质质量分数影响污泥中金属浓度的分布,沉淀池和滤池污泥中8种金属(Al,Fe,Cd,Cu,Cr,Pb,Mn和Zn)在<63 μm的粒径组分中质量分数相对较高。

Abstract: The particle size distribution, organics and polycyclic aromatic hydrocarbon (PAH) content in the sludge from sedimentation and filter of drinking water treatment plant in Nanjing were studied. According to Udden-Wentworth standard, the sludge particles can be divided into four fractions: <3.9 μm, 3.9-63 μm, 63-250 μm and >250 μm. The size fraction of 3.9-63 μm accounts for 55% and 73% (volume fraction) of sludge from sedimentation and filter respectively. The organics contents in sludge from filter range from 12.64% to 15.11% in different size fractions, which are higher than those from sedimentation (8.09% to 10.27%). The 14 types of PAHs are detected in both sludges, and the average mass fraction in sedimentation sludge is 556.59 ng/g while that in filter sludge is 468.44 ng/g. The total concentration of 2-3 rings PAHs is 2-3 times as much as that of 4-5 rings PAHs. The distribution characteristic of PAHs in different size fractions is coincidence with that of organics, and the concentrations of PAHs is higher in size fractions of >250 μm and <63 μm, while that of 63-250 μm is relatively lower. The particle size and organics content of sludge have influence on metals distribution, and the concentration of eight metals (aluminum, iron, cadmium, copper, chromium, lead, manganese and zinc) in fraction of <63 μm is slightly higher than in other fractions.

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