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This paper studies the bottom sludge and water of fishing ports near Yamen Waterway in Taishan City, and Xi-Nanyong Riverway in Foshan City, which are one of the most polluted areas in the Pearl River Estuary. By changing different ecological repair methods, we have studied the changing trend of nitrate nitrogen ammonium ∼ anaerobic ammonia oxidation ∼ denitrification pathway, and clarified the fate of nitrogen from the macroscopic view; we have established a continuous culture flow simulation device, which can Clarify the weight of ammonia nitrogen, which is generated by ammonium nitrate nitrogen. We changed the water quality parameters and concentration during the operation of the continuous flow device, including salinity, temperature and dissolved oxygen, aeration, flow rate, ammonia nitrogen, nitrate nitrogen, etc. We analyzed the relationship between the conversion rate of ammonia nitrogen and environmental factors. We obtained the DNRA rate through a continuous flow device. We analyzed the effects of different removal methods on nitrogen removal. The research results show that under the environment of salinity (0.48ppt), higher dissolved oxygen, lower temperature, higher ORP (greater than 300mV), it is conducive to the discharge of reactive nitrogen. On the contrary, the rate of ammonia nitrogen generated by DNRA increases, the max is 19nmol/(g h). making Nitrogen stays in the water. This conclusion can provide a theoretical basis for the accurate evaluation of the denitrification effects and the effectiveness of the methods for ecological restoration of the Pearl River Estuary and other similar estuaries.

Study on the mechanism of the increase/inhibition of nitrate ammonium by the ways of ecological restoration in the Pearl River Estuary