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| Application of pond system to control non-point pollution in rural area |
| Ran Jianghua1,Wang Keqin1,Chen Zhizhong2,Zhang Ruiguo1,Chen Quanfang1 |
| 1.Faculty of Environment Science and Engineering,Southwest Forestry College,650224;2.Kunming Municipal Hydrolical Bureau,650231: Kunming,China |
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Abstract The domestic sewage discharge is the important source of non-point pollution in rural area.To purify domestic sewage from rural area,pond system were constructed in downstream of domestic sewage rout to test the effect of treatment by pond system.Field monitoring were conducted and lasted more than a year.The result showed: 1) the pond system can control the outputs of ammonia nitrogen,total nitrogen and total phosphorus,the corresponding decreasing value were 3.78,4.20 and 1.06 g/(m2·d),respectively.The decreasing rate of ammonia nitrogen is provided with the best performance,with an average rate of 88.35%.the next are total nitrogen and total phosphorus,with the decreasing rate of 79.28% and 86.49%.2) the variance content of nitric nitrogen was not an criteria for decreasing by pond system owing to the coincidence of denitrification and nitrification.3) the corretation between the purifing effects and input rate of pollutions is negative.The results can provide a theoretical basis for rural non-point source pollution control of the same area.
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Received: 25 March 2009
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