大型冷却塔噪声综合控制技术

大型冷却塔运行时有其特殊的环境要求 ,噪声治理有一定难度。现以南通某化工企业大型冷却塔噪声治理为例 ,对其位置、结构、机理和特性进行了探讨 ,阐述了一整套实用的控制措施。结果表明 ,方案严密、结构紧凑、造价低、降噪效果明显 ,该技术适用于同类型噪声的治理     

人工湿地床示踪剂的研究

本文介绍了对适宜于人工湿地床的示踪剂筛选的原则和方法，从四种染料和食盐中，选定食盐作为人工湿地床的示踪剂，并介绍了食盐示踪剂的注入方法和检测系统。     

处理氯霉素废水优势菌的筛选

建立了降解氯霉素废水优势菌的筛选方法。经过筛选、分离和驯化后可得到 4个属的优势菌及其在培养基中的生长曲线。这些优势菌分别为黄杆菌属、产碱杆菌属、假单胞菌属和棒杆菌属。将优势菌制成混合菌液 ,用于处理氯霉素废水时 ,12h降解率达 91% ,较SBR法驯化污泥效率高。     

液晶屏抛光废液的资源化利用

以液晶屏抛光废液为原料制备冰晶石,首先加入碳酸钠,反应生成氟硅酸钠沉淀,去除废液中的氟硅酸根;再向滤液中加入NaOH和NaAlO2混合溶液,反应生成冰晶石。最佳工艺条件为:碳酸钠加入量为理论加入量的2.2倍,冰晶石制备反应温度为80℃,反应原料中n(HF)∶n(NaAlO2)为5.4、n(Na)∶n(Al)为3.4、NaOH和NaAlO2质量分数为20%。在最佳条件下制得的冰晶石产品中n(Na)∶n(Al)为2.84,达到GB/T4291-2007《冰晶石》中牌号CH-1的质量标准。采用该工艺可实现液晶屏抛光废液的资源化综合利用。     

Endocrine disrupting activities in sewage effluent and river water determined by chemical analysis and in vitro assay in the context of granular activated carbon upgrade

As part of endocrine disruption in catchments (EDCAT) programme, this work aims to assess the temporal and spatial variations of endocrine disrupting chemicals (EDCs) in River Ray, before and after the commissioning of a full-scale granular activated carbon (GAC) plant at a sewage treatment works (STW). Through spot and passive sampling from effluent and river sites, estrogenic and anti-androgenic activities were determined by chemical analysis and in vitro bio-assay. A correlation was found between chemical analyses of the most potent estrogens (estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (EE2)) and yeast estrogen screen (YES) measurement, both showing clearly a reduction in estrogenic activity after the commissioning of the GAC plant at the STW. During the study period, the annual average concentrations of E1, E2 and EE2 had decreased from 3.5 ng L⁻¹, 3.1 ng L⁻¹ and 0.5 ng L⁻¹ to below their limit of detection (LOD), respectively, with a concentration reduction of at least 91%, 81% and 60%. Annual mean estrogenic activity measured by YES of spot samples varied from 1.9 ng L⁻¹ to 0.4 ng L⁻¹ E2 equivalent between 2006 and 2008 representing a 79% reduction. Similarly, anti-androgenic activity measured by yeast anti-androgen screen (anti-YAS) of spot samples was reduced from 148.8 to 22.4 μg flutamide L⁻¹, or by 85%. YES and anti-YAS values were related to each other, suggesting co-existence of both types of activities from chemical mixtures in environmental samples. The findings confirm the effectiveness of a full-scale GAC in removing both estrogenic and anti-androgenic activities from sewage effluent.     

滚筒筛筛分生活垃圾的理论研究

滚筒筛是生活垃圾分选中常用的工具,但筛分理论目前还不够清楚,导致滚筒筛的设计多依靠经验进行。从生活垃圾在滚筒筛内的受力分析着手,考虑了物料与滚筒筛筛壁间的摩擦力,其为一有限值,推导出物料的提升角与滚筒筛转速的关系,且物料提升角的大小取决于物料静摩擦角的大小;认为无论滚筒筛的转速多大,物料的最大提升角都是固定不变的。经过一系列分析得出与已有的垃圾滚筒筛理论不同的结论：滚筒筛是否存在临界转速,取决于被筛分的物料：物料的静摩擦角≥90°,滚筒筛存在临界转速;否则,滚筒筛不存在临界转速。这一结论对滚筒筛的设计具有理论上的指导意义。     

现代化农业温室的夏季降温研究及其发展

本文阐述了夏季温室的常用降温方法,并加以简要的比较,提出了超声波雾化加湿在夏季农业温室降温中的应用和其控制方法,预测今后农业温室降温的发展趋势。     

高加速应力筛选试验技术研究

简要介绍了高加速应力筛选试验技术的产生、发展及在国外的应用情况,在分析高加速应力筛选试验技术基本原理的基础上,研究了高加速应力筛选试验技术的核心——试验剖面图的建立方法．并对高加速应力筛选试验技术的特点及如何开展试验等作了相关分析,最后进行了总结和问题讨论。     

振动筛噪声控制

以治理某铁矿球团厂振动筛筛选焦炭产生较强机械性噪声为例,针对振动筛噪声的污染状况,根据振动筛的工况及工艺流程,结合工人操作上的具体要求,通过科学合理设计,采取简便有效的多种降噪措施及实用的创新技术,使振动筛的噪声得以较好地控制。     

一种定量环境应力筛选中引入缺陷的计算方法

引入缺陷是定量环境应力筛选的关键参数之一。笔者从环境应力筛选的试验过程出发建立数学模型,推导一个计算元器件缺陷比例的数学公式,提出了一个间接计算引入缺陷的方法,最后给出一个算例,证明该方法是可行的。与国家军用标准上介绍的计算方法相比,该方法避免计算生产厂家的工艺缺陷,同时把研制产品的设计缺陷考虑在内,因此,更加客观、准确。