Zain S M, Basri H, Suja F, Jaafar O
Department of Civil and Structural Engineering, Faculty of Engineering, Universiti Kebangsaan Malaysia, Bangi, Selangor.
Water Sci Technol. 2002;46(9):303-8.
Some of the major concerns when applying sewage sludge to land include the potential effect on pH and cation exchange capacity; the mobility and the accumulation of heavy metals in sludge treated soil; the potential of applying too much nutrients and the problems associated with odors and insects. The main objective of this study is to identify the effects of sewage sludge application on the physical and chemical properties of sludge treated soil. Sewage sludge was applied to soil at various rates ranging from 0 L/m2 to 341 L/m2. In order to simulate the natural environment, the study was carried out at a pilot treatment site (5.2 m x 6.7 m) in an open area, covered with transparent roofing material to allow natural sunlight to pass through. Simulated rain was applied by means of a sprinkler system. Data obtained from sludge treated soil showed that the pH values decreased when the application rates were increased and the application period prolonged. The effect of sewage sludge on cation exchange capacity was not so clear; the values obtained for every application rate of sewage sludge did not indicate any consistent behaviour. The mobility of heavy metals in soils treated with sludge were described by observing the changes in the concentration of the heavy metals. The study showed that Cd has the highest mobility in sludge treated soil followed by Cu, Cr, Zn, Ni and Pb.
将污水污泥施用于土地时的一些主要问题包括对土壤pH值和阳离子交换容量的潜在影响；污泥处理土壤中重金属的迁移性和积累；施用过多养分的可能性以及与气味和昆虫相关的问题。本研究的主要目的是确定污水污泥施用对污泥处理土壤物理和化学性质的影响。以0 L/m²至341 L/m²的不同施用量将污水污泥施用于土壤。为了模拟自然环境，该研究在一个露天的试验处理场地（5.2米×6.7米）进行，场地覆盖有透明屋顶材料，以允许自然阳光透过。通过洒水系统施加模拟降雨。从污泥处理土壤中获得的数据表明，随着施用量增加和施用期延长，pH值下降。污水污泥对阳离子交换容量的影响不太明显；污水污泥各施用量下获得的值未显示出任何一致的变化趋势。通过观察重金属浓度的变化来描述污泥处理土壤中重金属的迁移性。研究表明，镉在污泥处理土壤中的迁移性最高，其次是铜、铬、锌、镍和铅。
