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| Influxes of COD in coastal rivers around the Bohai Sea and their contribution for total COD capacity in the Bohai Sea |
| JIN Chun-hong1,2, LI Zhao-ran2, SHENG Yan-qing2 |
1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;
2. Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China |
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Abstract During August 2013 to October 2014, four seasonal field sampling and investigation were conducted to get the fluxes of COD in 36coastal rivers around the Bohai Sea, the effects of COD on seawater quality were evaluated as well. The results showed that most rivers have been heavily polluted (COD reached grade IV, National Surface Water Quality Standard). However, the maximum values of COD and flux of COD did not appear in the same river. There was no significant correlation was observed between maximum value of COD and the maximum flux of COD. The annual flux of CODCr was the highest (606million tons), followed by the acidic CODMn (62million tons), the flux of alkaline CODMn was the lowest one with 53million tons. In rainy season, the flux of COD shared 68% of total value, followed by normal water season (28%) and the withered water period (only 4%). Approximately 25% of total CODMn (239million tons) in the Bohai Sea was from coastal rivers.
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Received: 08 November 2015
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