针对城市污水处理厂运行过程中产生微生物气溶胶,工作人员暴露于气溶胶环境可经呼吸摄入致病性微生物,最终造成健康寿命损失的问题,通过对污水处理厂空气中气溶胶颗粒及其携载的病原体进行定量识别,明确工作人员的职业暴露风险,进一步...针对城市污水处理厂运行过程中产生微生物气溶胶,工作人员暴露于气溶胶环境可经呼吸摄入致病性微生物,最终造成健康寿命损失的问题,通过对污水处理厂空气中气溶胶颗粒及其携载的病原体进行定量识别,明确工作人员的职业暴露风险,进一步结合微生物定量风险评估及疾病负担研究方法,以伤残寿命(disability adjusted life year, DALY)为健康评价指标,提出基于DALY的微生物气溶胶职业健康风险评估新模式及计算方法体系,并进一步遴选典型病原体进行疾病负担计算。结果表明:典型污水处理厂工作人员职业暴露过程中,经气溶胶摄入诺如病毒、腺病毒和轮状病毒造成的健康损失均明显高出WHO标准,需改进工艺或限制接触。展开更多
The characteristics of aerosol flotation, which include the effect of the concentration and particle size of kerosene aerosol on the molybdenum (Mo) flotation index and the effect of kerosene aerosol dosing method o...The characteristics of aerosol flotation, which include the effect of the concentration and particle size of kerosene aerosol on the molybdenum (Mo) flotation index and the effect of kerosene aerosol dosing method on the kerosene dosage and flotation time, were studied in the flotation of low-grade refractory molybdenum ores using kerosene aerosol. The results revealed that the particle size and concentration of kerosene aerosol had little effect on the Mo grade but had significant effect on the Mo recovery. A smaller particle size and a lower con-centration of kerosene aerosol were beneficial to the Mo aerosol flotation. For the received Mo ore samples, the optimized particle size of kerosene aerosol was 0.3-2 μm and the optimized aerosol concentration was 14 mg/L. The compressed air atomizer had a more uniform dis-tribution of aerosol particles than the ultrasonic atomizer, and the aerosol concentration was controlled easily, so the compressed air atomizer was more suitable for the research of aerosol flotation. Compared with conventional flotation in which kerosene was directly added into the ore pulp, the flotation time was reduced by ~30%, and the dosage was decreased by ~20% in aerosol flotation, while the Mo flotation index was similar.展开更多
文摘针对城市污水处理厂运行过程中产生微生物气溶胶,工作人员暴露于气溶胶环境可经呼吸摄入致病性微生物,最终造成健康寿命损失的问题,通过对污水处理厂空气中气溶胶颗粒及其携载的病原体进行定量识别,明确工作人员的职业暴露风险,进一步结合微生物定量风险评估及疾病负担研究方法,以伤残寿命(disability adjusted life year, DALY)为健康评价指标,提出基于DALY的微生物气溶胶职业健康风险评估新模式及计算方法体系,并进一步遴选典型病原体进行疾病负担计算。结果表明:典型污水处理厂工作人员职业暴露过程中,经气溶胶摄入诺如病毒、腺病毒和轮状病毒造成的健康损失均明显高出WHO标准,需改进工艺或限制接触。
文摘The characteristics of aerosol flotation, which include the effect of the concentration and particle size of kerosene aerosol on the molybdenum (Mo) flotation index and the effect of kerosene aerosol dosing method on the kerosene dosage and flotation time, were studied in the flotation of low-grade refractory molybdenum ores using kerosene aerosol. The results revealed that the particle size and concentration of kerosene aerosol had little effect on the Mo grade but had significant effect on the Mo recovery. A smaller particle size and a lower con-centration of kerosene aerosol were beneficial to the Mo aerosol flotation. For the received Mo ore samples, the optimized particle size of kerosene aerosol was 0.3-2 μm and the optimized aerosol concentration was 14 mg/L. The compressed air atomizer had a more uniform dis-tribution of aerosol particles than the ultrasonic atomizer, and the aerosol concentration was controlled easily, so the compressed air atomizer was more suitable for the research of aerosol flotation. Compared with conventional flotation in which kerosene was directly added into the ore pulp, the flotation time was reduced by ~30%, and the dosage was decreased by ~20% in aerosol flotation, while the Mo flotation index was similar.