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A fortified filler system (FFS) for treating septic tank effluent (STE) is effective. Two reactors were set up. One is a FFS and the other is a traditional soil system as contrast reactor. During seven months running, the soil system was clogged three times, but the FFS never. The removal rate of FFS for CODCr ranged from 80.0 to 92.8%, for ammonium nitrate (NH4+-N) from 61.8 to 99.0%, for total...
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