基于水足迹的粘胶短纤维生产水环境负荷评价

Water Environmental Load Assessment of Viscose Staple Fiber Based on Water Footprint

为量化和评价粘胶短纤维生产废水排放造成的水环境影响,分别基于灰水足迹和水劣化足迹理论核算与评价了粘胶短纤维生产过程的水环境负荷。结果表明:制浆阶段的黑液废水和纺练阶段的精练废水的灰水足迹较大,分别为3 375.35m^3/t和4 331.84m^3/t,特征污染物分别为COD和Zn离子;制浆阶段黑液废水的水体富营养化足迹最大,为9.05 kg PO4^3-eq/t,约占生产工序水体富营养化足迹的75%;纺练阶段精练废水的水体生态毒性足迹最大,为3.38×10^6 m^3 H2O eq/t,约占生产工序水体生态毒性足迹的73%;水酸化足迹主要集中于二浴废水和精练废水,分别为34.01 kg SO2 eq/t和46.86 kg SO2 eq/t。

In order to quantify and evaluate the water environment impact caused by wastewater discharge from viscose staple fiber production,the water environmental load of viscose staple fiber production process was calculated and assessed according to grey water footprint method and water degradation footprint method.The results showed that grey water footprints of the black liquor wastewater from the pulping stage and the refined wastewater from the spinning stage were larger than other processes,which were 3 375.35m^3/t and 4 331.84 m^3/t respectively.The characteristic pollutants in these two processes were COD and Zn ions respectively.The water eutrophication footprint of the black liquor in the pulping stage was maximum,9.05 kg PO4^3-eq/t,accounting for 75%of water eutrophication footprint in the production process.The refined wastewater in the spinning stage had the largest water ecotoxicity footprint,3.38×10^6 m^3 H2O eq/t,accounting for 73%of water ecotoxicity footprint in the production process.The water acidification footprint mainly concentrated in the two-bath wastewater and the refined wastewater,which were 34.01 kg SO2 eq/t and 46.86 kg SO2 eq/t,respectively.