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Technical Description during filtration, but precludes any penetration beyond the surface layer. A more efficient media system incorporating varied media layers is recommended. The different materials are always different specific gravities and are usually made up of various sizes of gravel, garnet. sand, and anthracite coal. The denser filter media are placed below the coarser but less dense coal, thus allowing deeper penetration in the direction of floe and main- taining a coarse surface layer even after backwash. This filter media design concept is termed multimedia. BODS concentrations that are trapped in the suspended solids of the secondary effluent can be effectively removed in a well-designed tertiary filter; however, standard multimedia filtration has little or no measurable effect on the removal of soluble BOD, which is generally less than 10 mi- crons in size. In applications where extreme effluent dedl shinfter the multimedia filtertlters, ultrafil- red, micro ters, nanofilters, and even reverse osmosis may RO, in conjunction with microfilters, is at a state in technological development where it is possi- ble to remove particulates down filtration ati0.1 on will ever be cron or 0.00000394 g000�in4�e wash water trethough atment andikrecy that the need for this type of f larnation area except to produce drinking water. The most important consideration in the sizing of tertiary filters, and one requiring considerable engineering judgment, is selection of the application rate, which is expressed as gallons per min- ute applied per square foot of filter surface aiea. In many cases, the maximum application rate is fixed by a regulatory agency. Some factors that must be considered in selection of the rate of application include: 1) efficiency of the secondary filter cycle duration and backwash water production; and 4) treatment process;2) flow pattern; 3) capital cost of equipment. With the Nitro-Raptor system, designed-in plant flow equalization allows loe'ulttfrom periodic slter flow rate ulec- rge tions based on equalized flow rates, which removes the problems that flows. With the unique batch design of the Nitro-Raptor secondary process, daily flow patterns (as well as peak flow rates) are near constant. thus a set schedule can be maintained for backwashing the filter media during low system flow periods. COM PUTERIZED/ELECTRONIC/ELECTRICAL-CONTROOSYSTEM td monitors the operational The Nitro-Raptor system. control unit provided by and microprocessoroperational of the entire treatment system with solid-state memory controlling down stream computerized systems. These systems are capable of monitoring m uand contrntr with capability m effluent disposal and reclaimed water systems. This system provides of monitoring all remote systems from their Headquarters in Grass Valley, California. They can coincidentally provide the client with the same information of monitored systems by modem or Internet Access to 7-H's Web Page. •17- 7-H Tecnnical Services Group.Inc.