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KMID : 0382419990250040069
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Korean Journal of Environmental Health Society
1999 Volume.25 No. 4 p.69 ~ p.79
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A Study on the Application of Chemical Upgrading in Wastewater Treatment
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Abstract
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This study was perfomed to examine the validity for the practical application of chemical treatment in D wastewater treatment plant. The content rate of Soluble COD/Total COD was characteristically high in the influent. In jar test for the influent to the reservoir tank and the effluent from the aeration tank, alum generally showed better removal efficiencies of COD, SS, turbidity and, especially T-P than FeCl_3, as compared on the basis of metal content, and there was no significant difference in the removal efficiency between Alum and PAC as compared on the basis of Al_2O_3 content. In pilot test for primary chemical treatment, alum showed much enhanced removal efficiencies of BOD, SS and T-P but COD and T-N as compared with the removal efficiencies by current mechanical treatment. The level of treatedwater quality but COD satisfied the permitted limit for discharge. In pilot test for the application of chemical precipitation treatment linked to the current activated sludge process, the best removal efficiencies of BOD, COD and SS were shown when alum was added to the outlet of aeration tank. The removal efficiency of T-P was significantly increased by the same treatment, but that of T-N was not effected. These results suggest that, to maximize the usefulness of chemical upgrading in the wastewater treatment, we should consider many factors, such as the compositional variations, pollution degree of wastewater, the mixture of industrial and domestic sewage, and the type of technologies in use.
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