Karvelas Michalis, Katsoyiannis Athanasios, Samara Constantini
Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124, Thessaloniki, Greece.
Chemosphere. 2003 Dec;53(10):1201-10. doi: 10.1016/S0045-6535(03)00591-5.
The occurrence and the fate of heavy metals (Cd, Pb, Mn, Cu, Zn, Fe and Ni) during the wastewater treatment process were investigated in the wastewater treatment plant (WTP) of the city of Thessaloniki, northern Greece, operating in the activated sludge mode. For this purpose, wastewater and sludge samples were collected from six different points of the plant, namely, the influent (raw wastewater, RW), the effluent of the primary sedimentation tank (primary sedimentation effluent, PSE), the effluent of the secondary sedimentation tank (secondary sedimentation effluent, SSE), sludge from the primary sedimentation tank (primary sludge, PS), activated sludge from the recirculation stream (activated sludge, AS), and the digested/dewatered sludge (final sludge, FS).The distribution of metals between the aqueous and the solid phase of wastewater was investigated. Good exponential correlation was found between the metal partition coefficient, logK(p), and the suspended solids concentration. The mass balance of heavy metals in the primary, secondary and the whole treatment process showed good closures for all metal species. The relative distribution of individual heavy metals in the treated effluent and the sludge streams indicated that Mn and Cu are primarily (>70%) accumulated in the sludge, while 47-63% of Cd, Cr, Pb, Fe, Ni and Zn remain in the treated effluent.
在希腊北部塞萨洛尼基市采用活性污泥法运行的污水处理厂中，研究了重金属（镉、铅、锰、铜、锌、铁和镍）在废水处理过程中的存在情况和归宿。为此，从该厂六个不同位置采集了废水和污泥样本，分别是进水（原废水，RW）、初沉池出水（初沉池出水，PSE）、二沉池出水（二沉池出水，SSE）、初沉池污泥（初沉污泥，PS）、回流 stream 的活性污泥（活性污泥，AS）以及消化/脱水污泥（最终污泥，FS）。研究了废水中金属在水相和固相之间的分布。发现金属分配系数 logK(p) 与悬浮固体浓度之间存在良好的指数相关性。初级、二级以及整个处理过程中重金属的质量平衡表明，所有金属种类的平衡情况良好。处理后出水和污泥流中各重金属的相对分布表明，锰和铜主要（>70%）积累在污泥中，而镉、铬、铅、铁、镍和锌有47 - 63%残留在处理后的出水中。
