« Previous AbstractA Microvalve Module with High Chemical Inertness and Embedded Flow Heating for Microscale Gas Chromatography    Next Abstract"An EAR-motif-containing ERF transcription factor affects herbivore-induced signaling, defense and resistance in rice" »

Chemosphere

Title:		Analysis of chemical compositions contributable to chemical oxygen demand (COD) of oilfield produced water
Author(s):		Lu J; Wang X; Shan B; Li X; Wang W;
Address:		"Ocean University of China, Qingdao 266003, PR China"
Journal Title:		Chemosphere
Year:		2006
Volume:		20050606
Issue:		2
Page Number:		322 - 331
DOI:		10.1016/j.chemosphere.2005.04.033
ISSN/ISBN:		0045-6535 (Print) 0045-6535 (Linking)
Abstract:		"This work was to give a comprehensive estimation for the chemical compositions contributable to COD of the produced water treatment system. For this purpose, the wastewater samples were collected from an onshore wastewater treatment plant. The chemical compositions of the wastewater were investigated, and the COD contributed by each component was estimated. The results showed that the COD levels of O&G and SS presented decreasing trends during the whole process and achieved total removal percentages of 95.1% and 62.3%, respectively. The final COD of organic acids and low-molecular-weight carbonyl compounds were respectively lowered to nearly 64% and 35% of their initial levels, and no regular trends were found for the COD of these chemicals during the whole treatment process. The COD of inorganic components presented minor variations at all sampling spots. The majority of COD was originated from O&G in raw wastewater. The COD contributed by O&G decreased greatly with continuous treatment and finally was lower than 17% of measured COD. At each sampling spot, the ratios of COD contributed by SS did not exceed 7.6% of measured COD. Other measured chemicals, including organic acids, carbonyl compounds, volatile phenols, reductive anions, metals and TDP were not the main sources of COD during the whole treatment process, and the ratio of COD was below 9% at each sampling spot. Most of the soluble components contributable to residual COD were still unknown after biological treatment, and the COD contributed by these components was greater than 57% of measured COD"
Keywords:		"China Industrial Oils/*analysis Industrial Waste/*analysis Oxidation-Reduction Oxygen/*chemistry Water Pollutants, Chemical/*analysis Water Purification/*methods;"
Notes:		"MedlineLu, Jinren Wang, Xiulin Shan, Baotian Li, Ximing Wang, Weidong eng Research Support, Non-U.S. Gov't England 2005/06/09 Chemosphere. 2006 Jan; 62(2):322-31. doi: 10.1016/j.chemosphere.2005.04.033. Epub 2005 Jun 6"