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- W2214652221 abstract "Glacial till, often with poor hydraulic conductivity or a topography that limits the use of traditionalwastewater soil infiltration systems (WSIS), is the dominant soil type in Norway. A newly developedcombined distribution and pretreatment unit overcomes some of the soil limitations and extends the useof WSIS. The new system, which may be used in any soil type, allows easy access to the infiltrativesurface and is thus superior to traditional gravel filled trenches regarding monitoring and maintenance ofWSIS.The new system is based on high head pumping of septic tank effluent to one or several units filled withlightweight clay aggregates (LWA). Each unit is directly connected to the pump by a small diameterpipe, and one small pump can serve several units. The wastewater is dosed through a singletangential/fullconical (TF)-nozzle that distributes the water evenly over the 2.3m 2 surface of thepretreatment filter. The filter medium can easily be replaced, and the nozzle can be refitted by hand.The wastewater is distributed to the different units using a hydrosplitter, or for larger or moreadvanced systems, using solenoid valves controlled by a timer or a programmable logic controller(PLC). The use of a PLC makes individual loading rates and dosing frequencies possible. It is alsopossible to adjust the loading to soil moisture conditions or groundwater levels beneath or adjacent tothe unit. The even distribution assures good utilization of the LWA filter media, and a significantreduction in BOD, SS, number of coliforms as well as nitrification is achieved. Higher soil acceptancerates for wastewater are therfore possible." @default.
- W2214652221 created "2016-06-24" @default.
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- W2214652221 date "2013-11-14" @default.
- W2214652221 modified "2023-09-24" @default.
- W2214652221 title "A NEW COMBINED DISTRIBUTION AND PRETREATMENT UNIT FOR WASTEWATER SOIL INFILTRATION SYSTEMS" @default.
- W2214652221 doi "https://doi.org/10.13031/2013.6028" @default.
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