化学沉淀-水解酸化-生物接触氧化-反渗透工艺处理垃圾渗滤液

研究了采用化学沉淀-水解酸化-生物接触氧化-反渗透组合工艺处理垃圾渗滤液的最佳条件,在pH=9,n(Mg2+)∶n(NH4+)∶n(PO34-)=1.2∶1∶1.05,搅拌速率170r/min,搅拌时间21 min条件下进行化学沉淀法脱氮,水解酸化反应器内废水停留时间10 h,生物接触氧化反应器内废水停留时间12 h,...     

一个中药污水处理工程运行实例

江苏省某企业中药污水处理工程采用调节池+深度水解+三级接触氧化+沉淀的处理工艺,该工艺运行费用低,处理效果稳定,便于管理,操作简单,易于维护。运行过程中,进水COD为2 500～3 500 mg/L,BOD5为1 200～1 500 mg/L,其出水各项指标均达到《污水综合排放标准》(GB 8978-1996)中的一级排放标准。     

Early Responses to Acute Ozone Exposure in Two Fagus Sylvatica Clones Differing in Xeromorphic Adaptations: Photosynthetic and Stomatal Processes, Membrane and Epicuticular Characteristics

Two Fagus sylvatica L. clones were used to investigate the early responses to acute O₃ exposure (150 nL L⁻¹, i.e., 1.35× ambient hourly peak in rural Italy) and whether xeromorphic adaptations affect gas exchange, membrane, and epicuticular responses. One clone originated in a wet and temperate climate in Central Italy (Tuscany); the other clone originated in a warmer and drier climate in the southern-most part of the F. sylvatica distribution (Sicily). Because of higher base gas exchange rates, the most negative effects of O₃ exposure (gas exchange impairment, uncoupling between net photosynthesis and stomatal conductance, increased membrane lipid peroxidation) were found in the southern clone. Xeromorphic adaptations (higher epicuticular waxes and stomatal density, lower leaf wettability and size) were found in this clone. Our results suggest that xeromorphism may increase O₃ sensitivity in species not adapted to face water stress, like the mesophilic F. sylvatica, when experiments are carried out with full irrigation. We present evidence describing the relationship between gas exchange and number and status of stomata. Stomatal density and the structural damage to stomata resulting from O₃ exposure did not affect gas exchange: In fact, non-stomatal limitations to photosynthesis prevailed over stomatal limitations.     

某型飞机典型电连接器接插件插拔特性和接触电阻仿真研究

目的 仿真分析电连接器的插拔特性和接触电阻的变化规律.方法 以海军某型飞机典型电连接器接插件为研究对象,采用ANSYS Workbench静力学模块,对电连接器接插件进行插拔特性分析,采用COMSOL对接触电阻进行仿真.结果 开始接触与插针圆形倒角完全进入簧片收口端倒角的中间阶段,插入力达到峰值.插针圆形倒角完全插入插...     

乙酰螺旋霉素废水生物处理的试验研究

采用相同体积 (6 2L)的升流厌氧污泥床和厌氧复合床处理乙酰螺旋霉素废水 ,当容积负荷为 6 0kg(COD) (m3 ·d)时 ,升流厌氧污泥床和厌氧复合床反应器对SS、COD、BOD5的去除率分别为 6 7 4 %、85 1%、91 2 %和 75 6 %、91 7%、96 1%,结果表明厌氧复合床是高效实用的厌氧生物反应器 ;厌氧出水采用相同体积 (6 4L)的生物接触氧化工艺和周期循环活性污泥系统进行处理 ,当容积负荷为 1 6kg(COD) (m3 ·d)时 ,生物接触氧化反应器和周期循环活性污泥系统对SS、COD、BOD5的去除率分别为 87 9%、85 1%、92 8%和 91 6 %、88 7%、95 4 %,结果表明周期循环活性污泥系统是高效实用的好氧生物反应器 .     

DJB-823保护剂对典型航空电连接器腐蚀行为的影响

目的 分析DJB-823保护剂对典型铝合金电连接器的影响.方法 在实验室条件下针对未喷涂和喷涂DJB-823保护剂的典型铝合金电连接器开展对比酸性盐雾试验,以孔蚀率、腐蚀速率和接触电阻为指标参数,表征腐蚀行为规律.结果 保护剂对电连接器有明显的腐蚀防护作用,保护剂使得电连接器孔蚀率降低了24％～37％.保护剂能有效保证...