| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 93 === The objective of this study is to investigate co-conditioning and dewatering of phosphorus-rich biological sludge with alum sludge. Capillary suction time (CST) and specific resistance to filtrate (SRF) were utilized to assess sludge dewaterability. The removal efficiency and the removal mechanism of soluble phosphorus from sludge were examined as well. To assess its role in phosphorus removal, the adsorption of phosphorus on alum sludge was studied. Both Langmuir and Freundlich adsorption isotherms were used to model adsorption reactions .
In co-conditioning, aluminum sludge, acted as skeleton builder, increased the incompressibility of phosphorus-rich biological sludge and induced adsorption of soluble phosphorus. The addition of phosphorus-rich biological sludge resulted in a broader range for polymer dosing, by shifting the zeta potential of aluminum sludge from nearly neutral to negative range.
In adsorption experiments, it was found that the adsorptive capacity decreased as pH increased. In addition, the amount of aluminum hydroxide in sludge affected adsorptive capacity significantly.
|
|---|
