Abstract: By systematically monitoring and analyzing the temporal and spatial characteristics of nitrogen and phosphorus and other main pollutants, it was found that the ecological pond chain had a better deep purification effect on the tail water of livestock and poultry breeding in rural areas. The average removal rate of total nitrogen and ammonia nitrogen in the ecological pond chain could exceed 80%, the overall removal rate of total phosphorus was about 80%, and the removal rate of permanganate index was close to 40%. The effluent concentration of total nitrogen and ammonia nitrogen were basically lower than 2.5 mg/L, which were superior to the national Grade A standard; The total phosphorus emission concentration was lower than 1 mg/L, reaching the national Class I B standard. The area of ecological ponds was the main factor affecting the removal rate, and the effect of temperature on the removal of total nitrogen and ammonia nitrogen were very significant, but the effect on the removal rate of permanganate index was not obvious.

Key words: ecological pond chain, tail water in poultry farms, deep purification effect, ecological pond area