淹没式生物膜-稳定塘组合技术处理农村生活污水研究

以淹没式生物膜-稳定塘组合技术处理农村生活污水,系统取消了二沉池、污泥回流。运行结果表明:系统对COD、NH3-N、TN和TP的平均去除率分别为84.33%、97.02%、80.18%和77.34%,出水平均浓度分别为14.88,1.06,9.92,0.53 mg/L。淹没式生物膜系统出水污泥浓度为零,稳定塘出水水质良好,可满足中水回用。     

基于间歇饥饿的SNAD工艺运行

在室温下(22℃±3℃)用SBR反应器运行SNAD工艺,通过定期延长系统水力停留时间,营造间歇饥饿环境,探讨间歇饥饿策略下SNAD工艺的运行情况.结果表明,系统经过间歇饥饿运行后,好氧阶段末的NO₃^--N浓度降至8. 72 mg·L^-1,亚硝酸盐积累率达到83. 18%,表明NOB活性得到了有效抑制,实现了亚硝化性能的提高;系统经过间歇饥饿运行后,好氧阶段末的亚氮与氨氮基质的比例得到调整,为后续厌氧氨氧化过程提供了合适底物,使出水氨氮浓度降至1. 0 mg·L^-1以下,同时由于出水硝氮浓度降低,总氮去除率达到了92. 07%左右,系统处理性能提高;通过测定功能菌活性,发现饥饿后亚硝化性能提高的主要原因是饥饿期AOB活性衰减速率低于NOB及恢复期前期AOB活性恢复速率显著高于NOB.     

Changes in the central and peripheral circulatory system in response to the cold: own studies using impedance plethysmography and Doppler ultrasound

The aim of the study was to determine the cardiovascular response to continuous (4 °C for 60 min) and intermittent (10 min at 4?°C and 10 min at room temperature alternately) exposure to the cold in 30 healthy young men. The subjects were equipped with a set of identical clothing (insulation 2.1 clo) and during the stay in the chamber and outside performed the same activities, i.e., walking on a treadmill at a speed of 0.5?km/h. The tests included assessing the central circulatory system using the Holter system and assessing the peripheral circulatory system using impedance plethysmography and Doppler ultrasound. The analysis of the parameters that describe the central and peripheral circulation poses a difficulty in determining which variant of exposure constitutes a greater load on the circulatory system. It should be noted that even the conditions used in the study may cause adverse effects in the cardiovascular system.     

福田保税区污水处理厂工艺选择

针对福田保税区的敏感地理位置 ,阐述了在该区域建设污水处理厂所采用工艺的确定过程和选择依据 ,并对第二阶段的比选工艺作了较为详细的比较 ,最终选出满足要求的SBR处理工艺     

湖泊沉积物短时间反复扰动下悬浮物上生物有效磷的动态变化

以太湖梅梁湾、月亮湾的沉积物和上覆水为材料,研究了较短时间尺度和沉积物反复扰动条件下,悬浮物中不同形态生物有效磷数量分布的变化特征.结果表明,随着扰动次数的增加,上覆水中藻类可利用磷(AAP)占溶解态总磷(DTP)的百分比均有所降低.试验期间,悬浮物中弱吸附态磷(NH4Cl-P)、可被生物利用颗粒态磷(BAPP)占总磷(Tot-P)的百分比平均值分别增加了3.5%、37.3%(梅梁湾)和2.0%、50.7%(月亮湾).梅梁湾悬浮物上AAP含量及其占Tot-P的百分比随扰动次数增加而增加,月亮湾则恰好相反.扰动期间,悬浮物上BAPP含量始终大于NH4Cl-P和AAP之和,表明BAPP的80%是由NH4Cl-P和AAP组成的.这也暗示了,仅仅以悬浮物中NH4Cl-P、AAP来估算BAPP存在一定的不合理性.     

低表观气速间歇曝气AGS-SBR系统处理实际生活污水

实验选用3个SBR反应器接种污水厂活性污泥,R1采用高表观气速（SGV）连续曝气,R2采用低SGV连续曝气,R3采用低SGV间歇曝气,在低碳氮比的实际生活污水中培养好氧颗粒污泥,探究不同SGV曝气条件对好氧颗粒污泥的形成及系统处理效果的影响.经过120d的培养,R1、R2和R3中颗粒粒径分别为（754±78）,（812±86）,（1183±93）μm,R3的脱氮除磷效果优于R1和R2.结果表明,应用低SGV间歇曝气策略在低碳氮比实际生活污水中培养的好氧颗粒污泥脱氮除磷性能良好,且系统中反硝化聚磷菌（DPAO）占聚磷菌（PAO）比例为24.75%.     

GIS‐Based Stream Classification in a Mountain Watershed for Jurisdictional Evaluation

This study analyzed stream characteristics in a mountain watershed in southwestern Colorado and developed a three‐level hierarchical classification scheme using national datasets to demonstrate jurisdictional evaluation as “waters of the United States (U.S.)” under U.S. Clean Water Act Section 404 at the watershed scale. The National Hydrography Dataset and USGS StreamStats were used with field observations to classify streams in the 53 km² Cement Creek Watershed based on flow duration (Level 1), stream order (Level 2), and other biophysical metrics (Level 3). Kruskal‐Wallis tests and discriminant analysis showed significant differences among Level 2 classes. Level 3 classification used cluster analysis for stream length, distance to the downstream traditional navigable water (TNW), and the ratio of mean annual flow from the source stream to the TNW. Results showed all perennial and intermittent streams are jurisdictional relatively permanent waters (RPWs), which include over a third of all streams, 64% are intermittent or ephemeral, and almost half are ephemeral first order. All ephemeral reaches are non‐RPWs requiring significant nexus evaluation to determine jurisdiction. These ephemeral first‐order streams can contribute 5% of the annual flow to the TNW at the confluence, while the Cement Creek main stem contributes 21% of the TNW flow. The study demonstrated that the classification provides key biophysical and regulatory information to aid jurisdictional evaluations in mountain watersheds.     

新型厌氧反应器启动运行试验

自行设计了一种新型厌氧反应器,并以模拟高浓度废水为基质,对其进行启动试验研究,考察在负压控制和间歇曝气条件下新型厌氧反应器的运行效果。结果表明:启动阶段COD去除率较高,平均去除率为70%,出水pH和SS稳定,反应器内无浮渣出现。同时,负压条件下反应器内所产沼气可优先分离,产气量及上升速度明显高于正压条件;另外,对反应器沉淀区污泥进行间歇曝气可加速污泥中微气泡的分离。     

化学防护服渗透性试验方法比较研究

渗透性是衡量化学防护服防护性能好坏的一项重要指标。本文就美标、欧标和ISO三大标准体系所涉及的渗透性测试相关试验方法进行了比较研究,找出了三种方法的相通之处以及其差异所在,对化学防护服渗透性测试研究提供指导。