Swine Wastewater Treatment Using Submerged Biofilm SBR Process: Enhancement of Performance by Internal Circulation through Sand Filter
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Environmental engineering study of swine wastewater treatment.
The study evaluates wastewater-treatment performance rather than research practice.
Environmental engineering of swine wastewater treatment processes.
Abstract
Pollutants removal from swine wastewater by a submerged biofilm sequencing batch reactor (BSBR) with internal circulation of liquor through a sand filter was studied. The variation of nutrient removal efficiencies with changes in volumetric circulation ratios and rates were determined. The reactor was operated under the following conditions: One cycle per day, hydraulic retention time of 15 days, average NH4–N loading rate of 55 g m−3 d−1 , and without supplemental external carbon source. System performance was enhanced by conducting internal circulation of liquor through the sand filter. When compared with the performance of a single BSBR without sand filter, nitrogen and phosphorus removal efficiencies were found to increase by 18% and over 33%, respectively. With a circulation rate of 170 L h−1 m−3 , and duration of 22 h (circulation ratio of 0.9), TOC, NH4–N , and total soluble inorganic nitrogen (as NH4–N plus NOx–N ) removal efficiencies of 73, 97.8, and 85.6%, respectively, were achieved. The enhancement of nitrogen removal was attributed to the occurrence of denitrification in the sand filter during circulation of liquor. The denitrification rate was proportional to the volumetric circulation ratio per day, resulting in an average 15% NOx–N removal in the sand filter. Also, it was found that continuous circulation during the entire reaction phases could be one way to achieve better performance.
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The record
- Venue
- Journal of Environmental Engineering
- Topic
- Wastewater Treatment and Nitrogen Removal
- Field
- Environmental Science
- Canadian institutions
- University of British Columbia
- Funders
- Korea Science and Engineering FoundationKangwon National University
- Keywords
- DenitrificationHydraulic retention timeNitrogenPulp and paper industryFilter (signal processing)WastewaterEnvironmental engineeringChemistrySequencing batch reactorPhosphorusEnvironmental scienceEnvironmental chemistry
- Has abstract in OpenAlex
- yes