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《Journal of Anhui Agricultural Sciences》 2008-09
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Study on the Effects of Extraction Time on the Leaching of Heavy Metals in Sewage Sludge

SONG Xue-dong et al(College of Water Conservancy and Civil Engineering;Shandong Agricultural University,Taian,Shandong 271018)  
[Objective] The research aimed to discuss the dynamic characteristics of heavy metal release in sewage sludge.[Method] The residual sewage sludge was collected from sewage plant in Nanjing.And the effects of extraction time on the leaching of heavy metals in sewage sludge were studied by using the leaching method for leaching the toxicity from solid wastes.[Result] The leaching of heavy metals in sewage sludge in water solution had an obvious dynamic equilibrium process of adsorption-desorption(release).The maximum leaching concn.of heavy metal release in sewage sludge had greater difference because of different heavy metals.Among of them,the maximum leaching concn.of Cr,Cu,Fe,Ni,and Zn all occurred on the 8th hour and that of Mn was on the 18th hour.Though the leaching concn.of Mo began to change slowly after the 8th hour,it didn't reach the highest leaching concn.until the 24th hour.[Conclusion] Extraction time had a significant effect on the leaching of heavy metals in sewage sludge.Sewage sludge had higher content of nutrient elements such as organic matter,N,P,etc.,so it had higher potential utilization value in agriculture.
【CateGory Index】: X703
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