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| Characteristics and spatial distribution of the rural non-point source pollution in Haihe River Basin |
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Abstract The emission characteristics of COD, TN, TP and NH3-N in Haihe River Basin which were discharged from three main kinds of rural non-point sources (NPS) including rural sewage, livestock and fertilizer loss were evaluated using pollution emission coefficient based on the national and provincial statistics in 2008, and the emission intensities and spatial distribution were analyzed. Total COD, TN, TP and NH3-N emission were 2435826, 3042079, 540568, 1798760 t/a, and emission intensities were 11.10, 13.97, 2.98, 8.28 t/(km2·a), respectively. The maximum NPS emission was from Hebei Province among the seven provinces in Haihe River Basin, and the rural sewage became the largest and top-priority controlling pollution sources among three kinds of NPS. Ziya River System was the largest receiving water of NPS pollutants among the nine river systems in Haihe River Basin. Tuhaimajia River System suffered from the largest NPS emission intensity and became the most heavily polluted river system, which was mainly resulted from the rural sewage discharged from Shandong Province. Moreover, the NPS pollutants emissions and emissions intensity were significantly regional distribution, the mountainous area presented a low pollution level and the plain area presented a high pollution levels.
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Received: 03 June 2011
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. [J]. CHINA ENVIRONMENTAL SCIENCECE, 2004, 24(3): 0-0. |
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