应用生物强化活性滤池的滤料选择及效果

生物强化活性滤池是一种经济有效的给水处理工艺,可去除约90％的AOC,保证出水的生物稳定性。滤料的选择应用是构建生物强化活性滤池的基础,直接影响了生物活性滤池内富集的生物量和出水水质。本文着重从滤料的角度,探讨了在构建和运行生物强化活性滤池过程中应予以注意的问题。     

饮用水生物滤池中亚硝酸盐氧化细菌的生长规律

饮用水生物滤池工艺中亚硝酸盐氧化细菌的生长状况可以作为反应器挂膜是否成功的标志，其生长具有明显的阶段性，在经历了延迟期和对数期之后进入稳定期，由于氨氧化细菌和亚硝酸盐氧化细菌在生态学上存在以后者为受利方的偏利互生关系，延迟期后期与氨氧化细菌的对数期生长相对应，表现为表观去除率的“对数下降”期．亚硝酸盐氧化细菌对数期生长的时间在1mo左右；低温可以使其长期处于延迟期．图7表3参12     

氨荒酸膦酸树脂滤器的制备及其在AAS分析中的应用研究

介绍了氨荒酸膦酸树脂过滤器的制备方法,以及应用该过滤器分离与富集地面水(海水)中Cu、Pb、Zn、Cd等元素的适用条件。实际样品中的Cu、Pb、Zn、Cd等重金属离子经过过滤器过滤,被吸附在树脂滤层中,用少量酸洗脱,以AAS测试,结果稳定、准确度高。此过滤器在痕量分析中具有很高的应用价值。     

环空带压气井保护液液位测试方法研究

为了有效检测环空保护液位,评估气井环空带压情况,在传统回声法检测的基础上,提出了基于频谱分析及自相关分析的2种液位检测方法;搭建了液位检测试验系统,开展了不同环空压力下的液位检测试验,计算了不同压力下的环空声速;设计了FIR低通滤波器对液面回波信号进行滤波处理,同时利用了上述2种方法计算液位值并与实际值及传统液位计算方法对比,得出了声衰减系数并评判了衰减过程对液面回波信号频谱分析的影响程度。研究结果表明:设计的FIR低通滤波器适用于所建液位检测试验的滤波处理过程;频谱分析及自相关分析都能够有效检测液位高度,最大误差分别为1.65%和0.61%,自相关分析方法具有更高的精确度;声衰减系数整体较小,对液面回波信号频谱分析结果影响较小。     

卧式滤筒除尘器的气流组织模拟研究

为了研究卧式滤筒除尘器内部气流的不均匀性问题,采用计算流体动力学软件Fluent对卧式滤筒除尘器内部气流组织进行数值模拟研究。参考目前市面上常见卧式除尘器,设计有、无挡板的2种卧式滤筒除尘器模型,通过分析2种模型下过滤过程的速度分布和滤筒流量分配情况得出:在无挡板模型下存在射流冲刷、气流分布不均等问题,而在进风口加设挡板能解决气流冲刷问题,滤筒流量分配得到明显改善;在相同滤室高度下分别对挡板角度为150°,160°,165°,170°,175°,180°对比发现,挡板角度在165°~170°时其内部气流组织能达到均匀标准。     

KALMAN FILTER ESTIMATION AND PREDICTION OF DAILY STREAM FLOWS: II. APPLICATION TO THE POTOMAC RIVER1

Results are reported from an application of the state space formulation and the Kalman filter to real-time forecasting of daily river flows. It is shown that the application of filtering techniques improves the overall forecasting performance of the model. As is true for most hydrologic systems, the model is not completely known. Therefore, the procedures pertaining to on-line parameter and noise statistics estimation, as presented in the first paper, are implemented. The example in this paper shows that these techniques also perform satisfactorily when applied to a real-world situation.     

BACTERIAL LEVELS IN CISTERN WATER SYSTEMS OF NORTHERN KENTUCKY1

ABSTRACT: In rural Northern Kentucky, rainwater is commonly collected from rooftops and stored in cement block cisterns as the sole source of drinking water. Although every cistern system is unique in some aspect of design, use, or maintenance, a bacterial survey of 30 rural Northern Kentucky cistern systems suggests that coliforms and heterotrophic bacteria are common to all types of cistern storage systems. An average of 600 coliforms/ml and 3.6 ± 10⁵ heterotrophic bacteria/ml were detected in water samples from the bottoms of the cistern storage tanks. Bacterial levels in water delivered to household cold tap faucets were similar to the levels found in the storage tanks. When detected, fecal coliforms were recovered throughout the entire system including the household cold tap faucet. Current U.S. regulations for drinking water quality are discussed, with a suggestion that fecal coliform levels may be a more appropriate guideline for interpreting the water quality of individually maintained, nonchlorinated, nonpiped water supplies, such as cistern storage systems.     

造纸中段废水与生活污水合并深度处理工艺

采用水解酸化＋CAST＋混凝＋复合滤池与水解酸化＋接触氧化＋混凝＋复合滤池2种组合工艺对造纸中段废水与生活污水进行合并处理对照试验.结果表明,两种工艺都是切实可行的,二级出水均可达到《污水综合排放标准》（GB8978-1996）二级标准,深度处理出水可达中水水质要求.其中以水解酸化＋CAST＋混凝＋复合滤池组合工艺效果最好.     

铁屑过滤+H2O2预处理难降解染料废水的研究

介绍了铁屑过滤+H2O2预处理难降解染料废水实验研究结果.采用铁屑过滤微电解法预处理难降解染料废水,当进水pH为4,停留时间为8 min时,出水BOD5/COD较原水提高0.2-0.3;若在铁屑过滤进水中加入H2O2(30%)8‰投加量,可使废水可生化性得到显著改善,有利于后续采用生化法处理.     

混凝沉淀-厌氧折流板反应池-两级好氧生化工艺处理毛毯废水

采用混凝沉淀 厌氧折流板反应池 两级好氧生化工艺处理毛毯废水。在废水 pH为 4 .6 3— 6 .95、CODCr为96 6— 1990mg/L、BOD5为 2 4 3— 4 97mg/L、SS为 344— 4 36mg/L、色度 4 0 0倍时 ,处理出水达到一级排放标准。该处理技术先进、可靠。