Abstract
Industrial waste by-products has been found to be suitable for using as a substratum in CWS (Constructed Wetland System) as it absorbs phosphorus (P as orthophosphate) to a greater extent than sand, soil or gravel matrices. In this study, the possibility of using the slag (waste by-products obtained from BHP steel industry, Australia) as a flocculant (in-line adsorbent addition) was investigated in the batch flocculation experiments. P removal efficiency increased with the increases of the flocculant dose, mixing rate and pH. The pH in the supernatant of the P solution kept increased up to intrinsic pH of the flocculant. This increase was proportional to the flocculant dose and its time. The given sample was introduced for the possible application of upgrading the sewage treatment plants with CWS. The economical feasibility and toxic materials discharge are found to be important factors for the application of this system. A brief discussion was introduced on the use of the slag to suppress P liberation from sediment which is one of major causes for eutrophication of closed water bodies.
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