tailieunhanh - ADVANCED ONSITE WASTEWATER SYSTEMS TECHNOLOGIES - CHAPTER 3

Phương tiện truyền thông bộ lọc như được thảo luận trong văn bản này là bộ phim điều trị cố định quá trình thiết kế để theo dõi điều trị chính trong một bể tự hoại và để cung cấp cao hơn xử lý nước thải. Nước thải sản xuất bởi các bộ lọc này có thể được khử trùng và thải ra dưới một hệ thống Loại bỏ Xả chất gây ô nhiễm Quốc gia (NPDES) cho phép, phân tán trong đất dưới bề mặt, hoặc tái sử dụng cho thủy lợi hoặc các mục đích gia đình nonpotable | chapter three Media filters Introduction Media filters as discussed in this text are fixed film treatment processes designed to follow primary treatment in a septic tank and to provide more highly treated effluent. The effluent produced by these filters can be disinfected and discharged under a National Pollutant Discharge Elimination System NPDES permit dispersed in the subsurface soil or reused for irrigation or nonpotable household purposes. Media filters are one of the oldest types of treatment mechanisms for both water treatment and wastewater treatment. During their early use in England sand filters were applied to treat water prior to use as drinking water. Sand filters continue to be used in large and small applications for water and wastewater treatment where they are used as pressure filters. In these cases the media is completely saturated and the water is ponded on top of the filters to provide adequate head to push either the treated drinking water or pretreated wastewater through the crust or schmutzdecke dirty floor of material that accumulates on the filter surface. These types of filters are known as pressure filters and although used for filtering secondary quality treated wastewater such as settled aerobic treatment plant effluent they should not be confused with the filters used for treating septic tank effluent. Although media filters for wastewater treatment may perform some functions similar to pressure filters for water treatment they should not be confused with pressure filters. The physical functions of the media filter are straining entrapment adsorption and impaction. These physical phenomena may be quite effective at the beginning of the filters operation but they may decline and become less important as the filter matures and the biochemical processes become the prevalent method of wastewater treatment. Media filters provide a fixed material for establishing a thin biological film by organisms living on the surface of the media. .

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