Application of Sewage Sludge on an Acid Tropical Soil: Crop Response and Heavy Metals Uptake by Maize and Their Accumulation in The Soil
At present, Malaysia produces about 5 million m3 sludge per year (wet weight basis). Land application of sewage sludge is considered the most economical and also provides an opportunity to recycle beneficial plant nutrients and organic matter to soil for crop production. However, sewage sludge al...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2002
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10614/1/FP_2002_28.pdf http://psasir.upm.edu.my/id/eprint/10614/ |
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| Institution: | Universiti Putra Malaysia |
| Language: | English English |
| Summary: | At present, Malaysia produces about 5 million m3 sludge per year (wet weight
basis). Land application of sewage sludge is considered the most economical and also
provides an opportunity to recycle beneficial plant nutrients and organic matter to soil
for crop production. However, sewage sludge also contain varying amounts of heavy
metals which may pose a hazard of metal toxicity to crops and the consumer of these
crops. Thus the uptake of heavy metals by crops and the fate of these heavy metals in
soils need to be monitored.
The first study, which involved ten sewage sludges, were collected from
different wastewater treatment plants and classified into domestic sludge (type A) and
light-industry sludge mixed with domestic sludge (type B). The chemical properties of
sewage sludge with emphasis on heavy metal content were determined. In general, type B sludge has higher heavy metal content than type A sludge. The concentration of heavy
metals in these sludges did not exceed the maximum permitted concentrations (MPC) of
the European Community Standard (ECS), for land application, except for Zn (7110.10
mg kg-I). Also, the Cu concentration is rather high in type B sludge. Therefore, type B
sludge can be characterized as quite hazardous and unsuitable for agricultural use. |
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