共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
膜生物反应器中的膜污染问题 总被引:1,自引:0,他引:1
膜生物反应器是高效膜分离技术与生化技术相结合的新型污水处理技术,它与传统污水处理技术有着明显的优越性。但是在运行过程膜污染问题却严重制约了它的推广应用。本文对膜污染的成因进行了分析,并介绍了控制膜污染的几种方法。 相似文献
3.
4.
5.
港口化学品废水具有水质、水量变化大,难于处理等特点,文中采用"隔油+Fenton氧化+水解酸化+膜生物反应器(MBR)"对港口化学品废水进行处理。结果表明:膜生物反应器具有较强的抗冲击负荷能力,系统出水稳定、水质良好,满足城市生活杂用水质标准的要求,活性污泥对污染物尤其是难降解物质的去除起主要作用。 相似文献
6.
7.
8.
9.
膜生物反应器(MBR)处理船舶含油废水在工程中得到了广泛的应用,为了研究膜生物反应器运行参数对处理船舶含油餐饮废水的影响,通过生产油脂产生的废水模拟船舶含油废水的水质特性,搭建小型膜生物反应器陆上试验系统,用光谱仪等仪器测量化学需氧量(COD)、生化需氧量(BOD)及氨氮等参数。研究膜生物反应器的水力停留时间(HRT)、COD和BOD及氨氮、膜压力、污泥浓度等指标之间的关系。系统稳定运行了70天。研究结果表明:膜生物反应器对油脂废水中COD、油、总碳(TOC)和BOD的去除率达80%以上,对氨氮的去除率达50%以上;油对膜的污染有较大影响。 相似文献
10.
为了提高6L21/31型船用中速柴油机的经济性和动力性,运用fluent软件的动网格模型对该柴油机扫气过程流场及其影响因素进行了研究,得到了该柴油机扫气过程缸内压力场、温度场、流场随曲轴转角的变化情况和不同因素对其扫气过程影响变化规律。通过分析得到原机在转速不变的情况下,气门重叠角增加5°CA,气缸扫气更充分,有利于提高该机的进气效率,对提高该机的经济性和动力性有利。以上研究可为该机在变工况下工作时功率的提高打下基础。 相似文献
11.
The greatest source of human-related mortality for endangered Florida manatees is collisions with watercraft. Regulation of boat speeds is the principal management tool to minimize this threat. Demands on law enforcement limit their ability to monitor boater behavior and managers seek alternative strategies to increase compliance. The purposes of this study were to: (1) explore the effectiveness of an on-site sign to enhance boater compliance in a boating speed zone, and (2) examine the environmental and boating characteristics that influence the probability of compliance. Signs designed to increase compliance were posted halfway through the 18-week study period. The signs were not related to compliance level. Logistic regression models showed that only time of day and boat type were significantly related to compliance. Results suggest that passive methods of persuasion may not be an effective means of influencing boater behavior. 相似文献
12.
分析港口发展多元化经营的影响因素,认为外部环境影响因素主要有世界港口的发展趋势、港口间的竞争压力、港口运作机制的转变和港口经营相关法律法规的变化,而内部因素包括港口区位优势和资源条件以及港口的核心竞争力。 相似文献
13.
14.
目前大量的沿海区域城市开始逐渐发展围海造陆工程,以创造出更多的建筑用地。目前地基处理方法中常用的是堆载预压法、复合地基处理法和真空预压法等方法。本文结合工程实例,分析真空预压抽真空阶段质量控制的重点及通病。 相似文献
15.
16.
AbstractAn increasing threat to the marine environment is the presence of debris in the ocean, which is predominantly a result of land-based sources and increasing use of single-use packaging items. To begin reducing the amount of debris entering the ocean, human behavior must be addressed. The purpose of this study is to evaluate how coastal recreationists behave towards the environment and whether their participation in recreation correlates to their reported behavior specific to marine debris control. Path analysis was used to determine how one’s attitudes, knowledge, recreational activity, and background characteristics influence behavior. Results showed that type of recreational activity had very little impact on behavior and other predictors. From the model, marine environmental concern, connection to the marine environment, and gender most directly influenced reported behavior. Therefore, to encourage change in recreationists’ relevant behavior, the results indicate social groups where behavior change efforts could initially be made. Additionally, the marine environmental concerns of different demographic groups should be considered and used in developing programs directed at increasing environmentally responsible behavior with emphasis on marine debris. 相似文献
17.
历史是一面镜子。回顾和分析中国封建制历史上宗教与国家政权的关系,并从中找出有价值的规律性的东西,对于有效的宏观宗教管理是大有裨益的。中国历史上中央政府对于宗教的态度发生过很多波动,但是无论怎样改变,都可以找到历史的规律。影响封建制国家宗教政策的因素大致可以分为帝王的宗教情感、国家财政状况和社会政治形势三个方面。通过对这三个方面的分析可以看出,一方面宗教要进行有效的自我约束,另一方面,国家政权要始终不忘加强对宗教的宏观管理。 相似文献
18.
本文研究了电池状态、充电制度、温度等因素对消氢催化剂催化效率的影响。结果表明催化效率随着电池状态和充电制度不同而发生变化:催化剂启动温度达到最佳点时,催化效率不受温度影响。 相似文献
19.
针对海员心理现状进行调查研究,调查内容主要包括该群体心理健康影响因素,探讨开展海员心理援助的必要性,进而提出开展海员心理援助的有效对策。 相似文献