Removal of trace organic chemicals in onsite wastewater soil treatment units: a laboratory experiment.

摘要: Onsite wastewater treatment is used by 20% of residences in the United States. The ability these systems, specifically soil units (STUs), to attenuate trace organic chemicals (TOrCs) not well understood. TOrCs released STUs pose a potential risk downstream groundwater and hydraulically-connected surface water that may be as drinking source. A series bench-scale experiments were conducted using sand columns represent evaluate efficacy TOrC attenuation function hydraulic loading rate (1, 4, 8, 12, 30 cm/day). Each was examined triplicate experimental columns. Columns initially seeded with raw establish microbial community, after which they fed synthetic spiked 17 TOrCs, four equal doses per day, provide consistent influent quality. After an initial start-up phase, effluent from all consistently demonstrated >90% reductions dissolved carbon nearly complete (>85%) oxidation ammonia nitrate, comparable performance field STUs. results this study suggest are capable attenuating many present domestic wastewater, but compound-specific. subset exhibited inverse relationship efficiency. Atenolol, cimetidine, TCPP more effectively attenuated over time each experiment, suggesting community evolved stage where biotransformed. Aerobic conditions compared anaerobic resulted efficient acetaminophen cimetidine.