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The optimal tax rate of COD and ammonia nitrogen was estimated based on the estimated economic loss caused by domestic sewage and the determined tax base in Binzhou City, The results show that due to the pollution of COD and ammonia nitrogen, the average economic loss of domestic sewage in Binzhou City from 2010 to 2017 was 167.292 million and 178.040 million yuan respectively. The average pollution equivalent amount of COD and ammonia nitrogen in domestic sewage in Binzhou City was43 435 and 3 900 t respectively, and the average optimal tax rate of COD and ammonia nitrogen was 3,85 and 45,65 yuan/kg respectively. That is, residents should pay a pollution tax of 3.85 yuan for every 1 kg of COD discharged and a pollution tax of 45,65 yuan for every 1 kg of ammonia nitrogen discharged. [ABSTRACT FROM AUTHOR]

Relationships between environmental pollution and economic development in Binzhou during 2001-2013 were studied through an Environmental Kuznets Curve (EKC). The results showed that with the increase of GDP per capita, the emissions of industrial wastewater, COD and ammonia nitrogen in Binzhou City increased at first and then decreased during 2001-2013, showing inverted-U-shaped curves where turning points appeared in the middle; the emission of domestic sewage showed an upward trend, and a turning point would not appear in a short term; the emissions of domestic COD and ammonia nitrogen dropped firstly and then rose gradually, showing U-shaped curves, and they would not decrease in a short time. The turning points of industrial wastewater, COD and ammonia were at (4.29,14 550), (2.46, 44 803) and (2.27, 2 708) respectively; domestic sewage had no turning point, and domestic COD and ammonia nitrogen would not reach the turning points in a short term. [ABSTRACT FROM AUTHOR]