Cold Climate Performance Analysis of On-Site Domestic Wastewater Treatment Systems
Abstract:Household on-site septic systems with secondary wastewater treatment in Anchorage, Alaska, were sampled and analyzed for performance parameters during the winter to spring months. System types included intermittent dosing sand filters (ISF), three types of recirculating trickling filters (RTF), and suspended-growth aeration tanks. Total nitrogen from the trickling filter and aeration tank effluent was fairly uniform, at approximately 30 mg/L. Total suspended solids (TSS) means were mostly less than 15 mg/L. The 5-day biochemical oxygen demand (BOD5) showed considerable variability, with means ranging from 9.2 mg/L for ISFs up to 39.5 mg/L for one type of RTF, even though this type has shown excellent results in several test programs. The data suggested that effluent temperature within the sample range had almost no effect on effluent concentrations of BOD5 or TSS and only a small effect on the removal of total nitrogen. Non-climatic factors were probably of equal importance to treatment results.
Keywords: aerobic treatment; nitrate removal; nitrification; nutrient removal; on-site treatment; sand filter; septic system; temperature effects; treatment system performance; trickling filter; wastewater treatment
Document Type: Research Article
Publication date: June 1, 2010
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