Research On The Nitrogen Pollution Of Municipal Water Body In Guangzhou

This paper researched the present nitrogen pollution in overlying water and interstitial water of 10 municipal water body in Guangzhou. We discussed the translation of nitrogen in samples of the simulation experiments in summer and in winter, compared the nitrification-denitrification with assimilation to find which was more important for the translation of nitrogen. The results show:1. The NH₄⁺-N and TN of overlying water in 10 municipal rivers were 6.21mg/l-22.4mg/l and 8.18mg/l-25.6mg/l respectively. The quality of water all belong to Under-V according to Standard for Surface Water Environmental Quality. The NH₄⁺-N and TN of interstitial water in 10 municipal rivers were 19.9mg/l-152mg/l and 21.8mg/l-154mg/l respectively. NH₄⁺-N was the most serious sources of pollution, however, there was almost no NO₂^- -N and NO₃^- -N in the overlying or interstitial water. The relativity between the value of concentration of ammonic and total nitrogen was very hard, but there was no visible relativity between two kinds of water no matter what about ammonic or total nitrogen.2. The simulation experiments showed that the temperature could accelerate the translation of nitrogen very visible. When in the same temperature, the value of DO resumed more quickly with the light, and there was no NO₂^- -N and NO₃^- -N cumulated in water samples. However, the translation of nitrogen in water samples was similar with the theory in anticipation when without light.3. In summer experiment, the results showed: adding photosynthetic bacteria (PSB) could not accelerate the dissolved oxygen resuming when without light. In the group of indoor the dissolved oxygen of sample which added PSB was higher than the sample with nothing; however, in the group of outside, there was no visible rule with the samples. Adding PSB could also accelerate the translating velocity of ammonic when within light, but there was no visible indication to prove it could affect the translating velocity of NO₂^- -N and NO₃^- -N for the concentrations of them were too low. But in the group of incubator, adding PSB would incumber the translation of nitrogrn.