汉江上游十大洪水气象特征分析

本文分析了安康大洪水的气候分布和气象成因,讨论了水文气象接口问题,指出进行气象洪水预报是可能的。     

接触氧化法处理屠宰废水

介绍了采用接触氧化法处理屠宰废水的设计、运行效果以及运行经验和体会。在进水COD为 80 0mg/L～13 0 0mg/L的情况下 ,经本系统处理 ,出水均在 5 5mg/L以下 ,最高去除率达 96%。     

印染废水处理工程设计与运行

根据印染废水水质特点．采用水解酸化、生物接触氧化、气浮脱色工艺处理印染废水。实际运行监测表明：出水COD,BOD,SS等各项指标均能达到GB4278--1992《纺织染整工业水污染物排放标准》中Ⅱ级排放标准,工程投资和运行费用较低。运行效果稳定,能广泛应用于纺织染整工业废水处理的实际工程中。     

某城市地下车库联络通道的消防安全研究

城市地下车库联络通道作为一种新型的地下交通联络通道,可净化地面交通,提高土地利用率,解决城市交通拥堵问题。然而这种通道兼有地下车库和城市交通隧道的特点,结构复杂,一旦发生火灾,损失较大。其防火设计的难点在于如何定性并选择合适的规范条文,因此有必要系统研究其消防安全问题并提出有效解决方案。以某城市地下车库联络通道为例,研究该通道的火灾危险性,提出防火分隔、探测报警、排烟以及人员安全疏散等消防设计方案和管理对策,并通过数值模拟方法验证了该方案的有效性和可行性。     

ABR-接触氧化-化学氧化组合工艺处理垃圾渗滤液方法研究

以垃圾渗滤液为研究对象,应用ABR 接触氧化 化学氧化组合工艺进行处理。通过分阶段污泥培养驯化以及变容积负荷进行试验研究,试验结果表明:进水有机负荷小于10 kg COD/(m3·d),好氧出水COD稳定在1 000~1 500 mg/L,去除率可以稳定在80%~85%;好氧池出水经过Fenton氧化处理,出水COD小于100 mg/L。该组合工艺对垃圾渗滤液能够进行有效处理,运行效果较好,技术上可行。     

Structural reliability analysis of contact fatigue design of gears in wind turbine drivetrains

Advances in the design of large scale wind turbines have raised an interest for more optimized life cycle design of mechanical components (e.g. gears, bearings, shafts, etc.), with a better understanding of their performance over time. Development of the non-systematic, often deterministic design methods followed by the application of corresponding design standards that incorporate experience from current common practice have managed to produce mechanical components that comply with minimum safety requirements. However, such approaches cannot achieve optimized mechanical components, neither account for the performance over their service lives. Reliability-based design currently represents the most advanced method in order to achieve the targets mentioned above, by explicitly considering uncertainty of design variables. This paper describes a structural reliability method (SRM) for fatigue analysis of mechanical components of wind turbines. The method is based on the ‘so-called’ limit state functions of relevant failure modes. Two gear tooth fatigue failure modes (surface and subsurface pitting) were considered. The method is exemplified by a time-domain based gear contact fatigue analysis of the National Renewable Energy Laboratory's 750 kW land-based wind turbine. The sensitivity of the reliability index on some random parameters used for reliability-based gear contact fatigue analysis is estimated. The effect of inspection on reliability analysis is also briefly investigated.     

Assessing public opinion regarding potential ATV-related policies

Problem

States with laws regarding ATV use and safety have lower mortality and injury rates than states with few or no restrictions. Our objective was to assess the attitudes of registered Ohio voters concerning potential legislation regarding ATV use and safety to determine the feasibility of its enactment.

Method

A statewide telephone survey of 838 registered Ohio voters was conducted and results were weighted by region to accurately represent all Ohio voters.

Results

Registered voters were in favor of restricting the use of ATVs by children < 16 years (81%), prohibiting passengers on ATVs (81%), requiring helmets (78%), and requiring all ATV owners and users to take a safety class (77%). ATV riders indicated that a mandatory helmet law would increase helmet use.

Impact on Industry

Assessing public opinion regarding public health and safety laws is a critical first step when considering legislation to improve ATV safety.     

A two stage batch adsorber design for methylene blue removal to minimize contact time

The adsorption of methylene blue onto bentonite in a batch adsorber has been studied. Three kinetic models, the intraparticle diffusion equation and the pseudo first and second order equations, were selected to follow the adsorption process. Kinetic parameters, rate constants, equilibrium adsorption capacities and related correlation coefficients for each kinetic model were calculated and discussed. It was shown that the adsorption of methylene blue onto bentonite could be described by the pseudo second order equation. Adsorption of methylene blue onto bentonite followed the Langmuir isotherm. A model has been developed for the design of a two stage batch adsorber based on pseudo second order adsorption kinetics. The model has been optimized with respect to operating time in order to minimize total contact time to achieve a specified amount of methylene blue removal using a fixed mass of adsorbent. The results of two stage batch adsorber design studies showed that the required times for specified amounts of methylene blue removal significantly decreased. This design is particularly suitable for low-cost adsorbents/adsorption systems when minimising contact time is a major operational and design criterion and a significant volume of effluent needs to be treated in the minimum amount of time.     

屠宰生产废水治理技术应用研究

某禽类屠宰厂年屠宰加工肉鸡3000万只,根据屠宰废水有机物浓度较高,可生化性好的特点,选择了"水解酸化+A/O工艺+接触氧化池"处理工艺。运行结果表明,经该工艺处理后,废水中的COD、BOD5、氨氮等指标均能达标排放,有利于企业的可持续发展。