Cell-to-cell pollution reduction effectiveness of subsurface domestic treatment wetlands.

摘要: Quarterly water quality data from 1998 to 2003 for eight single-family domestic systems serving 2-7 people in Ohio, USA, were studied determine the cell-to-cell and system wide pathogen reduction efficiency effectiveness of these meeting compliance standards. Two-cell wastewater treatment displayed significant variability their performance that directly impacted overall ability meet effluent Fecal coliform was effectively reduced (approximately 99%) while two-thirds input biochemical oxygen demand mitigated each cells systems. typically below 2000 counts per 100 ml 15 mg/l (respectively) before discharge surface waters. Total suspended solids by approximately 80% with cell one retaining majority 70%). These discharged more than 18 less 5% samples thus displaying a very high rate. Ammonia total phosphorus treated 30-40% reductions cell) exceeded standards (1.5 mg/l) frequently. Analyses based on number occupants indicated two-cell design used here most effective smaller occupancy More study is required value this large In future, wetlands should be evaluated loads delivered watershed rather concentrations.