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| Effects of Sewage Sludge Compost Application on Heavy Metal Accumulation in Soil and Green Pepper |
| Received:April 09, 2015 |
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| KeyWord:sewage sludge compost;heavy metal;green pepper;rhizosphere soil;enrichment coefficient |
| Author Name | Affiliation | | WANG She-ping | Xi'an Municipal Engineering Design & Research Institute Co.Ltd, Xi'an 710068, China
Xi'an University of Architecture and Technology, Xi'an 710055, China | | CHENG Xiao-bo | Xi'an University of Architecture and Technology, Xi'an 710055, China | | YAO Lan | Northwest A&F University, Yangling 712100, China | | LIU Xin-an | Xi'an Municipal Engineering Design & Research Institute Co.Ltd, Xi'an 710068, China | | WANG Yi | Xi'an University of Architecture and Technology, Xi'an 710055, China | | WANG Tong-yue | Chang'an University, Xi'an 710064, China |
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| Abstract: |
| Sewage sludge composts applied to soil could supply soil organic matter and plant nutrients, but might also cause heavy metal pollution in soil and plants. In this study, a pot experiment was employed to investigate the effect of applying sewage sludge compost on heavy metal accumulation in soil and green pepper and to determine the maximum application rate of sewage sludge composts. The sewage sludge compost was mixed with soil at different ratios of compost:soil(m:m), i.e., 0:100, 1:99, 5:95, 10:90, 20:80, 40:60, 80:20 and 100:0. The total dry biomass of green pepper increased with sewage sludge compost ratio from 1% to 5%. At 5% compost, the total dry biomass of green pepper was 2.67g per plant with fruit weight of 0.84 g per plant. However, the total dry biomass and yield of green pepper decreased at the compost ratios higher than 5%. Concentrations of Cu, Zn, Pb, Cr and Cd in soil increased gradually with increasing rates of the compost. At 5% compost, the content of Cu, Zn, Pb, Cr, Cd and Ni in both soil and green pepper fruit did not exceed the national standards. These results show that the acceptable application rate of the sewage sludge compost would be 5%. |
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