Journal of Water and Environment Technology
Online ISSN : 1348-2165
ISSN-L : 1348-2165
Original Papers
In-sewer Treatment System of Enhancing Self-Purification: Performance and Oxygen Balance in Pilot Tests
Tadashi SHOJIYoshiharu MATSUBARASatoshi TAMAKIKatsuo MATSUZAKAHiroyasu SATOHTakashi MINO
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2015 Volume 13 Issue 6 Pages 427-439


A novel sewer pipe with a double-deck structure was developed for in-sewer treatment. The upper deck is designed for the smooth transportation of wastewater, while the treatment is conducted by sponge media in the lower deck, which is intermittently exposed to wastewater and oxygen as with a trickling filter. The performance of the novel pipe was examined in the pilot-scale demonstration fed with domestic wastewater for 9 months. The indices of organic matter (BOD, COD, and SS) decreased for several hours of batch-mode recirculating tests. The removal rates ranged between 12 and 39 g-COD/(m•d) and were not significantly affected by temperature (18 - 29°C) and flow rate (6 - 15 m3/h). The estimated oxygen requirement was balanced with the intermittent oxygen supply, i.e., sum of reaeration with water flow and direct exposure without water flow. Furthermore, the performance of the novel pipe coupled with simple post-treatments was also examined. The coagulation was the most efficient: BOD was successfully decreased to below 20 mg/L by the in-sewer treatment for 3.5 h followed by the addition of 100 mg/L of polyaluminum chloride. The novel pipe, therefore, may be promising technology for both COD reduction (independent usage) and alternative secondary treatment (coupled with coagulation).

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© 2015 Japan Society on Water Environment
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