Input of pollutants with wastewater in Peter the Great Bay through the estuaries
Quantitative and qualitative composition of wastewater and total amount of pollutants released into estuaries of the Barabashevka, Razdolnaya, Artemovka, Shkotovka, and Sukhodol rivers flowing into the Amur and Ussuri Bays (Peter the Great Bay, Japan Sea) are calculated. Percentage of pollutants amount entering through each river from the total amount of pollutants released into the Amur and Ussuri Bays is estimated, as well as the portion of untreated sewage for each river. The largest amount of wastewater is released into the Razdolnaya: 14.567. 106 m3/year, the minimum volume - to the Sukhodol: 0.005. 106 m3/year. The amount of pollutants discharged into the Amur Bay with waters of the Razdolnaya is estimated as 20,173 t/year, whereas only 5 t/year is discharged into the Ussuri Bay with waters of the Sukhodol. Mean concentrations of pollutants in wastewater are: 1.38 kg/m3 for the Razdolnaya, 1.05 kg/m3 for the Sukhodol, 1.05 kg/m3 for the Shkotovka, and 0.28 kg/m3 for the Barabashevka. The whole volume of the wastewater discharged into the Sukhodol is untreated; on the contrary, the Artemovka has the largest portion of treated sewage.