TSLCDM长袋低压脉冲布袋除尘器及其应用

为了使电炉烟气治理过程中污染源的排放达到国家排放标准,提出一种TSLCDM长袋低压脉冲除尘器(简称TSLCDM除尘器)。通过对该除尘器结构、除尘原理以及不同工况下除尘效率和过滤阻力的分析,得到该除尘器的除尘效率>99.9%,压力损失<1200 Pa,最终排出的烟气含尘质量浓度约5.54 mg/m3,满足了国家的超低排放要求,以泉州某公司电炉项目除尘系统为研究对象,证明了该新型脉冲布袋除尘器在电炉烟气治理除尘系统的应用效果,具有很好的经济和环境效益。     

Applying a new method for direct collection, volume quantification and determination of N2 emission from water

The emission of N₂ is important to remove excess N from lakes, ponds, and wetlands. To investigate the gas emission from water, Gao et al. (2013) developed a new method using a bubble trap device to collect gas samples from waters. However, the determination accuracy of sampling volume and gas component concentration was still debatable. In this study, the method was optimized for in situ sampling, accurate volume measurement and direct injection to a gas chromatograph for the analysis of N₂ and other gases. By the optimized new method, the recovery rate for N₂ was 100.28% on average; the mean coefficient of determination (R²) was 0.9997; the limit of detection was 0.02%. We further assessed the effects of the new method, bottle full of water, vs. vacuum bag and vacuum vial methods, on variations of N₂ concentration as influenced by sample storage times of 1, 2, 3, 5, and 7 days at constant temperature of 15°C, using indices of averaged relative peak area (%) in comparison with the averaged relative peak area of each method at 0 day. The indices of the bottle full of water method were the lowest (99.5%-108.5%) compared to the indices of vacuum bag and vacuum vial methods (119%-217%). Meanwhile, the gas chromatograph determination of other gas components (O₂, CH₄, and N₂O) was also accurate. The new method was an alternative way to investigate N₂ released from various kinds of aquatic ecosystems.     

城市安全生产风险评估调研和信息处理方法研究

为城市安全生产风险评估调研工作的合理有序开展,本文结合实际案例归纳了城市安全生产风险评估调研的目的、范围、内容和流程,具体介绍了走访座谈法、常专结合法、函件调研法等信息采集方法,总结了综合归纳法和逻辑处理法等信息处理方法。结果表明,在调研的不同阶段运用不同的调研方法可有效获取城市安全生产风险源信息及安全生产基本信息,为城市安全生产风险评估工作奠定坚实的信息数据资料支撑。     

巢湖蓝藻的机械清除工艺以及藻水分离实验研究简

对巢湖蓝藻进行机械清除以及藻水分离实验研究，实验采用的浮式围栏引导-机械清除-投加剥离液辅助机械清除工艺处理量大，除藻效率高，筛网过滤-浓缩-卧螺离心机脱水成藻泥的藻水分离工艺较为理想，藻泥含水率仅为89%。2011年5—10月在巢湖运用上述方法清除湖面水华蓝藻，共处理富藻水1.6万m³，得到藻泥970 t，累计清除蓝藻106.7 t（干重）。按照所清除蓝藻的总氮、总磷的平均含量计算，相当于从湖中移除了氮6.25 t，磷2.1 t。表明在富营养湖泊中水华蓝藻大量暴发时，采用上述方法除藻，对控制蓝藻水华污染，有效降低内源氮、磷等污染物负荷具有十分重要的作用。     

Selective collection as a pretreatment for indirect solid recovered fuel generation

Effective selective collection (SC) has been increasing in many countries of the European Union. As a consequence the composition of residual municipal solid waste (RMSW) is changing not only because of economic development, but also due to the collection system. The input of RMSW treatment plants is thus not homogeneous. This paper analyses two case studies involving a total of five SC scenarios and their impact on the generation of solid recovered fuel (SRF) with/without bio-drying, post-treatment and packaging take back programs (TBPs). These case studies are based on two types of SC: kerbside and drop-off. The latest regulation on SRF classification is taken into account: energy content, Cl and Hg concentrations are assessed and discussed. The role of the respirometric index (RI) is also analyzed. Results show that when SC is highly efficient RMSW can be classified directly as SRF, but only if the introduction of RI does not set stringent respirometric targets. The role of packaging TBPs is important as the residual waste remaining after the packaging has been processed, can be valorized increasing the lower heating value (LHV) of the residual RMSW and minimizing the streams that should be landfilled. The source separation of food waste has a significant impact on the suitability of bio-drying: when the SC of food waste is very efficient, its percentage in the RMSW may be too low for effective bio-drying.     

再生资源产业发展的战略思考与对策建议

再生资源产业对于破解我国资源环境约束、推动新型城镇化建设和促进产业结构调整具有重要的支撑作用.但是我国再生资源产业处于发展初期,面临管理体系不善、技宋鬟备落后、产业规 缺位和产业政策不清等突出问题.对此,提出六点具体建议,包括：加强立法和产业发展的顶层设计,构建再生资源高效回收体系,推动技术装备升级和推广,完善配套财税政策,强化产业规划统筹和部门政策衔接,加强与新型城镇化建设的融合等.     

The influence of collection facility attributes on household collection rates of electronic waste: The case of televisions and computer monitors

In the US, household electronic waste collected for recycling is primarily by voluntary drop-off at designated collection facilities. This study examines the influence of specific collection facility attributes (recycling fees charged, number of days open, and driving distance) on the household collection rate of e-waste in the US state of Maine. Data were collected for household computer monitor and television collection for 92 municipal waste transfer facilities representing 30% of the state's population for one year. Results suggest that recycling fees are negatively correlated with the number of televisions and computer monitors collected; furthermore, the more frequently facilities were open, the more televisions and computer monitors were collected per capita. The distance from the facility had no correlation, which prompted an analysis of whether the existence of a curbside collection system in the municipality was influential. Results show a negative correlation between computer monitor and television collection and a municipality having recycling (but not e-waste) curbside collection. Based on the results of this study, policymakers may be able to increase the collection rate of household e-waste by eliminating or lowering recycling fees, expanding collection days and hours to increase convenience, and/or considering curbside collection of e-waste.     

生活垃圾源头沥水的减量提质效应研究

针对我国生活垃圾厨余组分含量高、含水率高和热值低的特点,提出以降低厨余组分含水率为主要手段,实现生活垃圾源头减量和提质为主要目标的源头沥水和选择性分质收集模式.在苏州市两个居民小区进行了为期10个月的项目试点,监测结果显示,居民家庭采取源头沥水措施后,生活垃圾产生量减少6.47%,含水率降低2.23%,低位热值提高10.94%.生活垃圾源头沥水的减量提质效应良好,有助于提高后续焚烧及填埋处理设施运行效率和二次污染控制水平,降低运输及处理成本.     

电除尘器电源交流分量对PM_(2.5)等细微颗粒物除尘效率的影响

除尘器对颗粒物的除尘效率与颗粒物的荷电量密切相关,PM2.5等细小颗粒物由于其荷电量不足而导致其吸收效率较低,对环境造成危害。为了增加粒子的荷电量,以粒子荷电原理为理论依据,从离子电流密度和通过电凝并扩大尘粒中位径2个方面研究了电除尘电源中交流电压分量对PM2.5等细小颗粒物荷电特性的影响,得出了电除尘器电源中交流电压分量可从以上2个方面提高装置对PM2.5等微小颗粒物的荷电量,且频率越高,幅值越大,荷电效果越好,从而可以提高装置对细小颗粒物的除尘效率。