Health risk assessment of municipal solid waste incineration emissions based on regression analysis

This study examined the potential health risks posed by the operation of 96 waste-to-energy(WtE)plants in 30 cities in the Bohai Rim of China.Utilizing a sophisticated simulation approach,the Weather Research and Forecasting(WRF)model coupled with the California Puff(CALPUFF)model,we obtained the spatial distribution of pollutants emitted by WtE plants in the atmosphere.Hazard indices(HI)and cancer risks(CR)were calculated for each plant using the United States Environmental Protection Agency's recommended methodologies.The results indicated that both HIs and CRs were generally low,with values below the accepted threshold of 1.0 and 1.0×10^(-6),respectively.Specifically,the average HI and CR values for the entire study area were 2.95×10^(-3)and 3.43×10^(-7),respectively.However,some variability in these values was observed depending on the location and type of WtE plant.A thorough analysis of various parameters,such as waste composition,moisture content,and operating conditions,was conducted to identify the factors that influence the health risks associated with incineration.The findings suggest that proper waste sorting and categorization,increased cost of construction,and elevated height of chimneys are effective strategies for reducing the health risks associated with incineration.Overall,this study provides valuable insights into the potential health risks associated with WtE plants in the Bohai Rim region of China.The findings can serve as useful guidelines for law enforcement wings and industry professionals seeking to minimize the risks associated with municipal solid waste(MSW)management and promote sustainable development.

Changes in Large Livestock Breeding Industry and Their Influences on Gross Output Value of Animal Husbandry in Guyuan City of Ningxia

[Objectives]The aim of this paper was to reveal the changes of large livestock industry and their influence on animal husbandry economy in Guyuan City of Ningxia.[Methods]The linear trend method was employed to quantify the change trends of the indicators for large livestock industry,and the ridge regression model was conducted to analyze their impacts on the gross output value of animal husbandry(GOVAH).[Results]The numbers of sold and slaughtered cattle and sheep in Guyuan presented a significant upward trend,while the number for hog had a significant downward trend,during 2000-2019.The GOVAH in Guyuan and its 5 counties had increased by 2-3 times in recent 20 years,which was mainly driven by large-scale livestock breeding.The cattle and sheep breeding sectors had positive effects on GOVAH,while the hog breeding sector had negative effect.[Conclusions]This study provides a reference for the structural adjustment and large-scale development of animal husbandry.