排序方式: 共有43条查询结果,搜索用时 15 毫秒
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鼓泡填料塔中水与餐厅污水氧传递特征 总被引:3,自引:0,他引:3
用不稳定传质模型对鼓泡填料塔中水和污水氧传递进行了理论分析,通过定义表面更新速率和含气率导出了鼓泡填料塔中水和污水中氧传递系数与操作条件和填料特征之间的关系式,并通过实验确定了关系式中特征参数.用关系式计算得到的氧传递系数与实测值基本吻合,最大偏差为20%.结果表明:采用的组合型填料具有优良的氧传递性能;在相同操作条件下餐厅污水中的氧传递系数小于清水中的数值. 相似文献
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利用超声场鼓泡塔和双电导探针气泡特征参数测量仪实时测定了加入不同种类和不同浓度添加剂前后鼓泡塔内氨气气含率与传质系数变化规律。实验结果表明:无添加剂时,超声频率为20-50-100 kHz组合,功率100 W时,鼓泡塔内气含率比无超声作用时增加了37%~74%,传质系数增大了39%~61%;气含率和传质系数随加入正辛醇浓度的增大呈现逐渐增长的趋势,当正辛醇浓度超过1.0%(V)时,气含率和传质系数趋于稳定;超声频率为20-50-100 kHz组合,超声功率100 W,正辛醇浓度为1.0%时鼓泡塔内气含率比无添加剂加入时增加了20%,传质系数增大了16%,可见超声场与添加剂协同作用有利强化气液相间分布、提高传质效果。 相似文献
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A novel and efficient technology for separating and recovering precious metals from waste water containing traces of Pd and Ag was studied by the combination of agglomeration and adsorption. The recovery process and the impacts of operating conditions such as pH value of waste water, adsorption time, additive quantity of the flocculant and adsorbent on the recovery efficiency were studied experimentally. The results show that Freundlich isothermal equation is suitable for describing the behavior of the recovery process, and the apparent first-order adsorption rate constant k at 25℃ is about 0.233 4 h^-1. The optimum technology conditions during the recovery process are that pH value is 8-9; the volume ratio of flocculant to waste water is about 1 :(2 000-4 000); the mass ratio of adsorbent to waste water is 1 :(30-40); and processing time is 2-4 h. Finally, the field tests were done at the optimum technology conditions, which show that the total concentration of Pd and Ag in the waste water below 11 mg/L can be reduced to be less than 1 mg/L. 相似文献
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本文从常规折流板式换热器的结构特点出发,指出其严重缺陷,提出了能克服这些弱点的新型高效折流杆换热器,阐述了其有效的防振性和高效节能性,着重介绍了新型高效低翅片管折流杆换热器的水力学和传热学设计预测方法。 相似文献
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混凝法处理餐厅酒楼污水的分析与研究 总被引:1,自引:0,他引:1
采用混凝法处理餐厅污水,在一定的pH值下,选择三种混凝剂对餐厅污水进行处理,结果表明:聚合氯化铝的混凝效果优于硫酸铝和聚合硫酸铁。聚合氯化铝的适宜投药量约为110mg/L,当pH为8-9,沉降时间为30min时,餐厅污水中油脂去除率可达90%以上。 相似文献
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