Phosphine production in anaerobic wastewater treatment under tetracycline antibiotic pressure

The influence of tetracycline(TC) antibiotics on phosphine(PH_3) production in the anaerobic wastewater treatment was studied. A lab-scale anaerobic baffled reactor with three compartments was employed to simulate this process. The reactor was operated in a TC-absence wastewater and 250 μg/L TC-presence wastewater for three months after a start-up period,respectively. The responses of p H, oxidation–reduction potential(ORP), chemical oxygen demand(COD), total phosphorus(TP), enzymes activity(dehydrogenase and acid phosphatase),and microbial community were investigated to reveal the effect of TC on PH_3 production.Results suggested that the dehydrogenase(DH) activity, acid phosphatase(ACP) activity and COD have positive relationship with PH_3 production, while p H, ORP level and the TP in liquid phase have negative relationship with PH_3 production. With prolonged TC exposure, decrease in p H and increase in DH activity are beneficial to PH_3 production, while decrease in COD and ACP activity are not the limiting factors for PH_3 production.     

地市级环境监测站大型仪器设备科学管理的探讨

结合地市级环境监测站大型仪器设备使用与管理情况,分析了大型仪器在环境监测站的重要性及现存问题,提出了地市级环境监测站大型仪器设备科学管理模式。     

环境保护图书档案的信息化管理

我国一直以来高度重视环境保护,制定了一系列重大的方针政策,各地区、各部门也不断加大环境保护的工作力度,取得了重要成果。在环境保护工作中,图书档案管理有着举足轻重的作用,当今时代也向环境保护图书档案管理提出了信息化建设的新要求。本文从环境保护图书档案信息化的意义和价值入手,提出环境保护图书档案信息化管理要采取的措施,分析了需要注意的问题,并提出了自己的建议。     

安全生产及合理管理对矿山经济效益的影响

通过分析我国金属矿山安全生产现状及存在的问题,从而提出依靠科学进步和矿山的挖潜改造;安全投入;强化爆破质量管理;提高选矿作业的金属回收率;加强劳动组织,发挥资源优势;开发新的产品;树立市场观念,以市场促生产;金属矿山的条件.     

SCR运行状况监测指标研究及远程监测技术的实现

在对选择性催化还原(SCR)脱硝工艺和反应原理进行概述的基础上,着重研究SCR运行的各影响因素,最终确定SCR运行状况远程监测指标,并分析各监测指标的具体作用,应用可靠的监测数据远程传输技术,建立SCR运行状况远程监测平台,为统计火电厂SCR运行效率、NOx排放量和加强SCR监管提供技术支持。     

基于SSD网络的电梯内电动自行车检测研究*

为减少因电动自行车违规操作而造成的消防安全事故,杜绝电动自行车进电梯的违规行为,基于深度学习SSD目标检测网络,使用VGG16、EfficientNet、MobileNet 3种主干网络,研究SSD网络对电梯内电动自行车检测的可行性,分析比较3种网络的检测效果,并提出基于双摄的检测方法,进一步提高电梯场景下检测准确度,减少误检误报警。研究结果表明:SSD检测网络对电梯内电动自行车检测效果良好,其中SSD_MobileNet网络更适用于工业领域,双摄检测方法的检测准确率均大于90%。     

Fenton氧化处理对土壤中芘的生物可利用性的影响

研究发现蚯蚓吸收土壤中污染物芘的速率很快,10 d后蚯蚓体内富集污染物浓度基本达到稳定态;土壤中的有机质是影响污染物迁移的重要因素,土壤有机质的含量越高对芘滞留(吸附)能力越强,蚯蚓富集芘的量越低,蚯蚓富集到体内污染物的浓度越低.这也说明土壤对污染物的吸附/解吸行为决定了土壤中污染物的生态风险;氧化处理降低了土壤中的有机质含量,改变土壤有机质的组成,氧化处理也降低了土壤中被吸附污染物芘对蚯蚓的生物有效性.     

反渗透处理糖厂二效汽凝水回用锅炉的研究

糖厂以二效汽凝水取代原水回用锅炉是"节能减排"的重要措施,但含糖量过高的二效汽凝水回用锅炉后,将影响锅炉高效、安全使用。故此采用一级反渗透装置对二效汽凝水进行除糖净化处理。实验结果表明:反渗透系统的脱盐率能够稳定在87.82%左右,出水水质完全达到中压锅炉补充给水水质标准。建议拥有中压锅炉的糖厂采用糖厂锅炉补充给水除糖净化新工艺。     

Sex pheromone of the tea aphid,Toxoptera aurantii (Boyer de Fonscolombe) (Hemiptera: Aphididae)

The tea aphid, Toxoptera aurantii, also called the “black citrus aphid”, is one of the most destructive insect pests in commercial tea plantations and gardens in southern China. In autumn, declining day length triggers production of winged T. aurantii sexuparae, which produce both winged males and wingless oviparae. Oviparous females then release sex pheromone that attracts potential mates. GC–MS analysis of volatile headspace extracts of T. aurantii oviparae revealed that they emit (4aS,7S,7aR)-nepetalactone (I) and (1R,4aS,7S,7aR)-nepetalactol (II) in a ratio of 4.3–4.9:1. Field-trapping experiments with synthetic I and II singly or as two-component blends of different doses and ratios showed significant attraction of T. aurantii males, as well as weak attraction of sexuparae. Identification of the T. aurantii sex pheromone provides a new opportunity for developing a pheromone-based monitoring and management strategy for the sexual phase of tea aphids and, possibly, the alate sexparous generation in late summer and fall.     

Seismic vulnerability assessment of water supply network in Tianjin,China

The water supply network （WSN） system is a critical element of civil infrastructure systems. Its complexity of operation and high number of components mean that all parts of the system cannot be simply assessed. Earthquakes are the most serious natural hazard to a WSN, and seismic risk assessment is essential to identify its vulnerability to different stages of damage and ensure the system safety. In this paper, using a WSN located in the airport area of Tianjin in northern China as a case study, a quantitative vulnerability assessment method was used to assess the damage that the water supply pipelines would suffer in an earthquake, and the finite element software ABAQUS and fuzzy mathematic theory were adopted to construct the assessment method. ABAQUS was applied to simulate the seismic damage to pipe segments and components of the WSN. Membership functions based on fuzzy theory were established to calculate the membership of the components in the system. However, to consider the vulnerability of the whole system, fuzzy cluster analysis was used to distinguish the importance of pipe segments and components. Finally, the vulnerability was quantified by these functions. The proposed methodology aims to assess the performance of WSNs based on pipe vulnerabilities that are simulated and calculated by the model and the mathematical method based on data of damage. In this study, a whole seismic vulnerability assessment method for a WSN was built, and these analyses are expected to provide necessary information for a mitigation plan in an earthquake disaster.