TITLE:
Biological Toxicity of Sewage Sludge Stabilized by Reed Bed on the Luminescent Bacteria
AUTHORS:
Jiangang Li, Yubo Cui, Wanjun Zhang, Yuying Dong, Shuran Jia
KEYWORDS:
Reed Bed, Activated Sludge, Luminous Bacteria, Biological Toxicity
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.3 No.1,
March
20,
2015
ABSTRACT: With the expanding scale of urban wastewater treatment, the resulting
excess sludge quantity is also growing. Excess sludge treatment and disposal
has become an important part of the sewage treatment. Sludge itself is rich in
essential nutrients of plant growth such as nitrogen and phosphorus, so it’s a
good organic fertilizer; but it often also contains harmful substances such as
heavy metals. If the sludge treatment is not good, it not only can bring
secondary pollution to the environment, but also can cause the waste of
resources. Luminescent bacteria tests are conducted in this research by
comparing the effects on the absorption and transformation of toxic substances between
traditional sludge drying bed and reed bed. The study finds that the biological
toxicity of surface layer sludge either in reed bed or in traditional drying
bed has little change with the seasons and maintains in low level. While the biological
toxicity in the bottom of sludge has change with the seasons and achieves the
lowest level in summer and fall, and the biological toxicity of sludge in reed
bed is lower than that of traditional drying bed.