Temporal variation pollution source and decontamination characteristics of the Myriophyllum spicatum treatment pond
2020
Xue, Jinfeng | Li, Haicai | Du, Jiazhi | Zhou, Mingyue | Mei, Yang
The analyses for temporal variation pollution sources of Qijiawan treatment pond show that in non-livestock and poultry breeding area, total phosphorus (TP) pollution mainly happens during the period from June to August with both farmland and domestic sewage as the main pollution source and during the Spring Festival with domestic sewage as the source. Total nitrogen (TN) pollution mainly occurs during the rainy season from July to September taking domestic sewage and nitrogen fertilizer as main sources, besides the Spring Festival with domestic sewage as the main pollution source. As for ammonia nitrogen pollution, it is similar to TN pollution, and domestic sewage is the first pollution source. The emphasis of pollution control should be put on the phosphorus especially particle phosphorus (PP) in the domestic sewage and dissolved organic nitrogen (DON) in the sewage and farmland fertilizer. In addition, nitrate‑nitrogen (NO₃⁻-N) is mainly from the impervious land surface and transfers into the treatment pond with rainfall. COD into the pond in the rainy season was greater than that in the dry season, but anyhow, it firstly comes from domestic sewage, especially in the Spring Festival. Research on the purification performance of Myriophyllum spicatum treatment pond shows that it is relatively difficult for Myriophyllum spicatum to absorb COD and TN with DON as the main form, but it is very easy to absorb TP and NH₃-N before October. Therefore, Myriophyllum spicatum should be harvested in this month in order to realize effective removal. The removal of COD and TN mainly depends on microbial degradation, and so it should be enhanced in order to improve water quality of treatment pond.
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