多种物化生化组合工艺处理印染电镀混合废水

通过"混凝+预处理曝气+预处理沉淀+A2/O生化法+物化"组合工艺对污水处理厂废水进行处理,对COD、TP、TN、NH3-N等测定数据进行分析,评价污水处理厂运行效果.结果表明:COD、TP、TN、NH3-N的平均去除率分别为97％、96％、70％、97％,出水各项指标的平均值分别为:COD浓度为46 mg/L、TP浓度为0.06 mg/L、TN浓度为8 mg/L、NH3-N浓度为0.6 mg/L,出水满足《城镇污水处理厂污染物排放标准》(GB 18918-2002)中的一级A标准要求,在进水浓度低于设计值的情况下,出水污染物浓度不易受进水量增加的影响.     

A/A/O工艺脱氮除磷最佳运行参数的确定

通过对COD、TN、TP和NH3-N监测分析,确定了A/A/O最佳的工艺参数为污泥负荷为0.20kg COD/(kg MLSS·d),停留时间为8h,最佳污泥浓度为3000mg/L,泥龄为15d,其脱氮除磷效果良好,COD、TP、TN、NH3-N去除率分别为89.0%、93.0%、63.1%、84.5%,其出水达到了《城镇污水处理厂污染物排放标准》(GB18918-2002)Ⅰ级标准。     

咸阳某污水处理厂CASS工艺运行参数优化

针对污水处理厂CASS工艺处理城市污水过程中COD、BOD5、SS、NH3-N去除率较高,但TN、TP去除效果不佳的情况,优化调整了CASS工艺运行参数。调整后COD、BOD5、SS、TN、NH3-N、TP的去除率分别为94.2%、88.6%、93.7%、69.9%、96.8%、78.4%,各项出水指标均达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级B标准。     

A~2/O氧化沟—纤维转盘滤池工艺处理城市污水

以某污水厂为例,介绍了水解酸化—A2/O氧化沟—纤维转盘滤池组合工艺处理城市污水的效果。该工程处理水量7万m3/d,进水COD、BOD5、SS、NH4+-N、TN、TP分别为326.2、138.8、156.8、32、63、1.6 mg/L。采用该工艺处理后,COD、BOD5、SS、NH4+-N、TN、TP的去除率分别为90.1%、93.3%、94.4%、90.0%、77.3%、75%,出水达到了《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A排放标准。该工艺具有运行费用低、处理效果好、操作方便的优点。     

超滤膜在城市污水深度处理技术中的研究

本文分析了鄂尔多斯市达拉特旗污水处理厂污水中COD、NH4+-N、TP出水浓度水质特征以及经过MBR工艺处理后进出水浓度变化过程,结果表明:该工艺对COD、NH4+-N的平均去除率分别为94.78%、96.88%;试验平均出水COD浓度为31.42mg/L,NH4+-N浓度为1.99mg/L,均达到了《城镇污水处理厂污染物排放标准(GB18918-2002)》的一级A标准,可见该工艺对城市生活污水的有机污染物和氨氮有很好的去除效果。但是试验对污水中TP的平均去除率只有67.00%,平均出水TP浓度为1.84mg/L,远高于国家城市污水排放标准中的TP的排放限值。     

A~2/O生化法+物化法污水处理厂运行效果分析

介绍了采用A2/O生化法+物化法工艺的污水处理厂的工艺流程、主要构筑物参数,对COD、TP、TN、NH3-N等测定数据进行分析,评价污水处理厂运行效果。结果表明,污水经过处理后,COD、TP、TN、NH3-N平均去除率分别达到88.9%、89.0%、49.7%、98.4%,出水COD为17 mg/L,TP、TN、NH3-N的质量浓度分别为0.145、9.15、0.23 mg/L,满足GB 18918-2002的一级A标准要求。在进水COD低于设计条件的情况下,出水污染物含量不易受进水量增加的影响。     

水力停留时间对SBR工艺脱氮除磷效果的影响分析

以西安市第四污水处理厂初沉池实际出水为研究对象,研究了SBR试验装置中HRT对有机物、氮、磷的去除效果。结果表明,HRT对COD、PO43--P的去除效果影响较小,对TN和NH4+-N的去除影响较大。TN和NH4+-N的去除率随好氧停留时间、缺氧停留时间的增加而增大。试验装置在缺氧段、好氧段停留时间分别为5 h、3.5 h的运行条件下,对COD、NH4+-N和TN的平均去除率分别达到了86%、98%和74%,出水水质除TP之外,均达到了城镇污水处理厂污染物排放标准(GB 18918-2002)一级A排放标准要求,试验结果为SBR工艺污水厂升级改造提供了工艺运行参数,也可供同类型污水处理厂工艺升级改造设计时参考。     

某城镇污水处理厂污染物去除效果研究

以某污水处理厂升级改造工艺(改良A~2/O+MBBR组合工艺+混凝深度处理工艺)为研究对象,对2015年污水处理厂主要进出水水质指标进行分析,发现该污水处理厂主要水质指标COD、TN、NH3-N和TP出水浓度均能稳定达到一级A标准,出水浓度年平均值分别为28.6mg/L、9.5mg/L、1.49mg/L、0.22mg/L,平均去除率分别为96.4%、86.8%、97.3%、97.3%,该污水处理厂污染物去除效果良好,去除率较高。     

水解酸化+水力增氧床+人工湿地组合工艺处理生活污水的试验研究

研究了水解酸化-水力增氧床-人工湿地组合工艺对实际生活污水中COD、NH_4~+-N、TN、TP和浊度的去除效果。结果表明,组合工艺对污水中COD、NH_4~+-N、TN、TP和浊度的去除效果显著,平均去除率分别为94.3%、92.0%、60.3%、83.6%、93.4%,出水满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准,可用于中水回用。     

纳米陶瓷膜在工业园区污水处理工程中的应用

广西某工业园区污水处理厂采用纳米陶瓷膜污水处理工艺(NCMT)进行升级改造,处理规模为5 000m3/d,介绍了该工艺流程,给出了主要构筑物设计参数及处理效果。连续稳定运行30 d的结果表明, COD、BOD5、 NH3-N和TP平均去除率分别为91.4%、 94.8%、 90.8%和91.2%,出水水质稳定达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级A标准,吨水处理成本降低了21.5%。     

一方圆玺 一朝国事

一方圆玺,不知见证了多少的历史风云!     

千碉之国·丹巴

丹巴县是四川省甘孜州的东大门.被誉为"深藏在横断山脉中的世外桃源",是嘉绒藏族风情文化的中心,属岷山、邛崃山区,是川西高山峡谷的一部分.文化底蕴厚重,民俗风情浓郁,区内遍布的古碉是藏族先民的建筑艺术杰作,具有悠久灿烂的历史.     

A SIMULATION OF A MOTIONLESS MIXER

Continuous laminar mixing in segmented twisted-tape motionless mixers is considered. A solution to the steady isothermal creeping flow of a Newtonian fluid in a twisted-tape mixer has been obtained via two-dimensional numerical procedures. The developed flow within a section of the mixer has been solved in a helical coordinate system by an iterative scheme. The resulting solution is rigorously correct in the absence of entrance and exit flows at the junction between sections. An algorithm is presented for the modelling of these junction flows via two-dimensional procedures. Simulated cross-sectional mixing patterns have been generated for comparison with experimental results

The performance of twisted-tape mixers is simulated for various designs, beginning with the particular geometry of the Kcnics Static Mixer, and for different operating conditions Results suggest that the rate of mixing as a function of the total twist per section is optimized with respect to pressure drop when sections contain 80 degrees of twist. The capability for rational improvement in other design and operating parameters is illustrated. The mechanisms of laminar mixing are discussed and quantified; of primary importance is the tendency for interfacial area to assume an orientation within each section which is favorable to mixing in subsequent sections.     

A MATHEMATICAL ANALYSIS OF A MEMBRANE BIOREACTOR CONTAINING A SLUDGE DISINTEGRATION SYSTEM

The activated sludge process is widely used to treat domestic and industrial wastewater. A significant drawback of this process is the production of “sludge”, the disposal of which can comprise a significant proportion of the total operating costs of a wastewater treatment plant. We analyze the steady-state operation of a membrane bioreactor system (MBR) incorporating a sludge disintegration unit (SDU) to reduce sludge production. We provide a qualitative understanding of the model by finding analytically the steady-state solutions of the model and determining its stability as a function of the residence time. In practice a target value of the mixed liquor suspended solids (MLSS) content within the membrane reactor is specified. Applying the mathematical technique of singularity theory we show that if the sludge disintegration factor is sufficiently high then the MLSS content is guaranteed to be below the target value. This model prediction, of key interest from a practical perspective, was not identified in the original investigation of this model, which relied upon numerical integration of the governing equations.     

一起制氮设备的故障分析

在浮法玻璃生产过程中,氮气流量保持恒定,是保持锡槽工况稳定的重要条件,是生产优质浮法玻璃的重要前提条件之一.只有制氮设备的稳定运行,才能保证氮气供应.本文就制氮空压机运行中出现的故障现象、原因进行了分析,并提出了改进措施.     

一种新型传动结构的斜坡辊道

浮法玻璃厂联合车间受工艺限制,往往将2楼熔制成形车间和1楼包装车间用斜坡辊道连接起来。而2楼与斜坡之间衔接的凸弧辊道、1楼与斜坡之间衔接的凹弧辊道,其结构形式往往成为设计及安装调试的难点。传统的弧段结构采用锥齿轮箱和同步带传动结构,与当前主流的通轴弧齿锥齿轮结构相比较为落后。本文对浮法玻璃车间斜坡辊道结构进行详细阐述,并提出了一种新的凸、凹弧辊道的传动结构。     

A MATHEMATICAL MODEL FOR A YANKEE HOOD

Drying of thin paper sheet on a Yankee cylinder equipped with a steam heated high velocity hood is examined. When possible infiltration of air from the surroundings is considered, then the process is fully determined by twelve variables. One of these can be chosen as an independent variable. An equation group of eleven equations is derived. The method of solution is iterative. Finally, a numerical demonstration example is presented.