Sewage sludge effects on soil: Heavy metal accumulation and movement
作者:
RobertW. Taylor,
DeshR. Duseja,
PrabhakarR. Thangudu,
期刊:
Journal of Environmental Science and Health . Part A: Environmental Science and Engineering
(Taylor Available online 1982)
卷期:
Volume 17,
issue 3
页码: 427-441
ISSN:0360-1226
年代: 1982
DOI:10.1080/10934528209375040
出版商: Taylor & Francis Group
关键词: heavy metal accumulation;heavy metal movement;heavy metal phytotoxicity;organic waste
数据来源: Taylor
摘要:
Treated municipal sewage sludge at 0, 11.2, 33.6, and 67.2 metric tons/ha was applied each year for two consecutive years and incorporated into a Byler loam soil (Typic Fragiudalf) having an initial pH of 5.6. Sorghum (Sorghum vulgare L.) was grown in replicated plots (6.1m × 4.6m). Soil samples were taken at 0 to 20 cm and 20 to 40 cm depth at the end of each year and analyzed for DTPA‐extractable Cu, Zn, Cd, and Ni. Surface soil exhibited significant increases in heavy metal concentrations in the first year at the 67.2 metric tons/ha rates. Heavy metal concentrations increased with continued sludge application. However, this increase was not in proportion to the amount of sludge applied suggesting some immobilization of metals with time. After two years, downward movement and significant increases in Cu, Zn, and Ni levels were noted at the 20 to 40 cm depth at the higher rates. Heavy metal levels in the surface soil did not appear to be phytotoxic as judged from sorghum grain and dry matter yields and comparisons with other similar studies. Sludge applications had little effect on soil pH.
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