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Cold Climate Performance Analysis of On‐Site Domestic Wastewater Treatment Systems
Author(s) -
Williamson Eric
Publication year - 2010
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143009x12529484815557
Subject(s) - wastewater , sewage treatment , environmental science , waste management , environmental engineering , cold climate , engineering , meteorology , geography
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 (BOD 5 ) 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 BOD 5 or TSS and only a small effect on the removal of total nitrogen. Non‐climatic factors were probably of equal importance to treatment results.