Comparing effects of untreated and treated wastewater on riverine greenhouse gas emissionsWastewater may alter riverine fluxes of dissolved organic matter (DOM) and CO 2 , yet little is known about how treated and untreated wastewater affects riverine DOM biodegradation and CO 2 emission to a different degree. In order to compare effects of treated vs untreated wastewater on DOM biodegradation and CO 2 emission in downstream rivers, a three-day incubation experiment with river water mixed with wastewater (10%) was conducted under dark laboratory conditions. Initial dissolved organic carbon (DOC) concentrations were eight times higher in untreated sewage from Phnom Penh than in effluents from a wastewater treatment plant. Biodegradable DOC (BDOC) measured as % of initial DOC during the three-day incubation was 31 times higher in sewage than in treated wastewater, indicating abundant labile DOM moieties in sewage. The mixtures showed higher concentrations of BDOC and dissolved CO 2 than the levels expected from the mixing ratio, suggesting mixing-enhanced biodegradation of DOM. Differential excitation-emission matrices (EEMs) exhibited consistent patterns of enhanced consumption of DOM especially in untreated wastewater and its mixtures. Overall results suggest that labile DOM derived from sewage can enhance the biodegradation of riverine DOM and hence CO 2 emission, especially in rapidly urbanizing river systems receiving loads of untreated sewage across developing countries. Biodegradation, CO 2 , Dissolved organic carbon, Wastewater
We estimated sediment pollution by the analysis of COD and AVS. We also estimated the contents of Cu, Cd, Pb, Zn in sediment of Gwangyang bay, Mokpo inner bay and Shinan Bigum coastal area from 2011 July to 2012 February. In these results of sediment COD and AVS show III level pollution in Mokpo inner bay, however Gwangyang and Shinan Bigum coast show I level pollution. The results of Igeo show over 2 on the contents of Cu and Cd in Gwangyang bay and Mokpo inner bay. It also know that Igeo can more and detail estimate sediment pollution in industrial coastal area. These results show that it is suitable to estimated sediment pollution by COD and AVS with trace metal in industrial and initial polluted coastal area rather than analysis of COD and AVS only in coastal area.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.