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Optimal Configuration of Wastewater Treatment System for the Reuse of Municipal Wastewater

  Experimental study of Pilot-plant scale has been performed with ASA system connected with Sand filter, GAC, and RO as wastewater reusing system. As the results of the batch test performance of ASA + Sand filter + GAC connecting with RO, Cl？, COD, NH₄-N and PO4-P were over 99% in all cases of 20 bar, 30 bar and 40 bar. Especially, Cl？ level was shown with excellent removal rate of over 99%. It was sure that all the items had over 90% removal. 20 bar selected in RO batch test was adopted to continuous test. The results have it that Cl？, COD, NH₄-N, PO₄-P and Ca²？ except for turbidity were over 91%. Through the assessment of wastewater reuse, only the treatment by ASA + Sand filter or ASA + Sand filter + GAC system is applicable to toilet flushing or cleaning. Particularly, it is considered that ASA + Sand filter plus RO system is very effective as dyeing industy water which need high water quality.