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| COD environmental capacity of different zones of the Bohai Sea with the consideration of self-purification |
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Abstract To determine the partial water quality, it is essential to divide large water area into smaller partitions according to the geographical structure. In present paper, China’s Bohai Sea was divided into four zones (i.e., Laizhou Bay, Bohai Bay, Liaodong Bay and the center of Bohai Sea). The hydrodynamic induced mass convection and diffusion and the chemical degradation were considered, the former was used to compute the diffusion capability of cumulative chemical oxygen demand (COD) in different zones, and the latter was applied to solve COD decreasing property, thus the degradation ability could be estimated. After the comprehensive consideration of these two parts, the COD environmental capacity was obtained with different water quality standards considered. The result shows that COD capacity is different in these four areas. For Laizhou Bay, the COD concentrations could satisfy the standard of “relatively clean”, and the environmental capacity has additional 26% to reach the standard; For Laizhou Bay, the COD concentrations was very close to the standard of “light pollution”, and the environmental capacity only has 5% left. For Liaodong Bay, COD concentrations met the standard of “relatively clean”, and the environmental capacity remained 88%.
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Received: 05 October 2014
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