| A subsurface flow wetland was constructed to assess its ability to treat agricultural and domestic wastewaters. Problems identified with the agricultural wastewaters were that silage leachate could not be treated in the wetland and solids were a problem associated with fat buildup from the milkhouse washwater. After the diversion of these wastewaters mass reductions increased from 77 to 99% for TSS; 0 to 99% for BOD5; 0 to 75% for TKN; 41 to 92 % for TP; 0 to 82% for NO3-N; 0 to 68% for NH4+-N and 84 to 99% for E. coli . k values determined were 14.6, 8.4, 3.2, 7.5, 5.7, 2.8, and 0.6 m y-1, respectively. Hydraulic loading rate and mass loading showed significant correlation (P<0.05) with k values for E. coli, TSS, TKN, TP, NH4+-N and NO3--N. Tracer studies determined retention time with in theoretical retention time from 0.8 to 9.5 d. |
