Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 6, Pages 1781-1786Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.10.038
Keywords
Fixed media bioreactor; Sanitary sewer overflow; Biochemical oxygen demand; Total suspended solids; Nutrient removal
Funding
- City of Columbus, Ohio
- Environmental Science Graduate Program
- Ohio Agricultural Research and Development Center
- Finnish Funding Agency for Technology and Innovation [402/06]
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Five types of fixed media bioreactors (biofilters) - sand, felt (textile), peat, felt/sand, and peat/sand - were used to treat sanitary sewer overflow (SSO). A simulated 6-h peak flow of a 25-yr SSO event contained 40-125 mg/l biochemical oxygen demand (BOD5) and was loaded on the bioreactors at a high hydraulic loading rate of 0.2 m/h. The sand bioreactors were the most effective in the treatment, reducing BOD5 by 84 +/- 9%. The combination media peat/sand and felt/sand showed similar efficiency with peat, higher than felt. After the initial start-up, all the bioreactors; reached >90% reduction of total suspended solids. The bioreactors also effectively removed ammonia and total phosphorus concentrations in a 2-h SSO loading, which would occur more often than a 6-h peak flow in a 25-yr SSO event. The effluent concentration of nutrients increased with continued loadings after the first 2 h. (C) 2009 Elsevier Ltd. All rights reserved.
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