title: Emission of Carbon Dioxide and Methane from Duckweed Ponds for Stormwater Treatment.
abstract: This study determined the greenhouse gas emission from two laboratory-scale duckweed ponds for stormwater treatment. The rate of carbon dioxide (CO2) emission from the two duckweed systems was 1472 ± 721 mg/m(2)·d and 626 ± 234 mg/m(2)·d, respectively. After the removal of duckweeds, CO2 emissions decreased to 492 ± 281 mg/m(2)·d and 395 ± 53 mg/m(2)·d, respectively. The higher CO2 emissions in the duckweed systems were attributed to duckweed biomass decay on the pond soil surface. A thin-film model was able to predict the increasing CO2 concentrations in the closed static chamber during 2 weeks of sampling. The initial methane fluxes from the duckweed systems were 299 ± 74 mg/m(2)·d and 180 ± 91 mg/m(2)·d, respectively. After the removal of duckweeds, the flux increased to 559 ± 215 mg/m(2)·d and 328 ± 114 mg/m(2)·d, respectively.
authors.affiliation: Department of Civil and Environmental Engineering, University of Missouri-Columbia, Columbia, MO 65211, USA.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Dai
authors.forename: Chiqian
authors.initials: C
authors.lastname: Zhang
authors.forename: Chung-Ho
authors.initials: CH
authors.lastname: Lin
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Hu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D029064:Araceae / Q000378:metabolism*; D002245:Carbon Dioxide / Q000032:analysis*; D008697:Methane / Q000032:analysis*; D008923:Missouri; D061005:Ponds; D011891:Rain; D014872:Water Movements; D018508:Water Purification
chemical_list: D000393:Air Pollutants; D002245:Carbon Dioxide; D008697:Methane