The Effect of Temperature on Biochemical Oxygen Demand Removal in a Subsurface Flow Wetland
| Autor: | Hongjian Xiang, Rishi Raj Bhattarai, D. M. Griffin |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Hydrology
Biochemical oxygen demand geography geography.geographical_feature_category Ecological Modeling Wetland Seasonality medicine.disease Pollution Filter (aquarium) Wastewater medicine Environmental Chemistry Environmental science Subsurface flow Waste Management and Disposal Effluent Water Science and Technology |
| Zdroj: | Water Environment Research. 71:475-482 |
| ISSN: | 1061-4303 |
| Popis: | Investigators have reported that seasonal variation in wastewater temperature has little or no effect on biochemical oxygen demand (BOD) removal in subsurface flow wetlands (also referred to as rock-plant filters). This study examined temperature and BOD data collected biweekly (every 2 weeks) over an 18-month period from a rock-plant filter treating high-strength wastewater (median pump station discharge BOD = 425 mg/L) at an interstate highway rest area in south central Louisiana. Results show a seasonal variation in effluent BOD with greater mean removal occurring when wastewater temperature in the splitter box is greater than 20 °C, whereas removal at wastewater temperature less than 20 °C exhibits a wider variation and lower mean. An exponential model relating splitter box temperature to effluent BOD concentration, R 2 = 0.69, fits the data only slightly better than an Arrhenius type relationship R 2 = 0.67. Both models suggest that two cells in series may be required for this facility to meet its BOD permit limit in colder weather. A linear model relating percent of BOD removed to splitter box temperature did not fit data as well (R 2 = 0.50). |
| Databáze: | OpenAIRE |
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