Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada.
Environment and Climate Change Canada, Burlington, Ontario, Canada.
Ground Water. 2023 Jul-Aug;61(4):586-598. doi: 10.1111/gwat.13316. Epub 2023 May 3.
Monitoring of a seasonal-use, on-site wastewater disposal system (septic system) in Canada, over a 33-year period from 1988 to 2021, showed that during recent sampling the groundwater plume had TIN (total inorganic nitrogen) averaging 12.2 mg/L that was not significantly different than early values, representing 80% removal, whereas SRP (soluble reactive phosphate), although higher than early values averaging 0.08 mg/L, was still 99% lower than the effluent concentration. Evidence suggests that the anammox reaction and possibly also denitrification contribute to TIN removal, whereas SRP removal is primarily the result of mineral precipitation. Most of the removal occurs in close proximity to the drainfield infiltration pipes (within about 1 m) demonstrating that reaction rates are relatively fast in the context of typical groundwater plume residence times. This long-term consistency demonstrates that sustainable nutrient treatment can be achieved with conventional on-site wastewater disposal systems that have low capital costs and require minimal energy input and maintenance.
对加拿大一个季节性使用的现场废水处理系统（化粪池系统）进行了长达 33 年的监测，从 1988 年到 2021 年。监测结果表明，在最近的采样中，地下水羽流中的 TIN（总无机氮）平均为 12.2mg/L，与早期值没有显著差异，代表 80%的去除率，而 SRP（可溶解性反应磷）虽然高于早期值，平均为 0.08mg/L，但仍比出水浓度低 99%。有证据表明，厌氧氨氧化反应和可能的反硝化作用有助于去除 TIN，而 SRP 的去除主要是矿物沉淀的结果。大部分去除发生在靠近排水渗透管的地方（约 1m 范围内），这表明在典型的地下水羽流停留时间内，反应速率相对较快。这种长期的一致性表明，可持续的养分处理可以通过具有低资本成本、最小能源投入和维护要求的传统现场废水处理系统来实现。
