共查询到20条相似文献,搜索用时 46 毫秒
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为改善城市水环境和地表水水质,国家出台了《水污染防治行动计划》。其中很重要的一项就是对现有污水处理厂进行提标改造,强化对氮、磷的去除。通过铝污泥人工湿地与传统活性污泥工艺的嵌套结合而研发的一种新型工艺——GBR工艺为之提供了一种新的升级思路。通过小试尝试将SBR反应器优化为GBR工艺。结果表明,在维持反应器工作容积不变的情况下,GBR工艺将反应器的最大氮负荷和水力负荷分别提高了53%和33%,而且对COD、总氮和磷的平均去除率分别高达87.7%、93.6%和95%。分析表明,铝污泥人工湿地通过磷吸附、改善污泥性状等功能实现了GBR处理能力和效率的提高。总之,GBR工艺在当下污水处理厂的提标改造中具有很大的开发应用潜力。 相似文献
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《中国给水排水》2015,(11)
以给水处理厂产生的铝污泥为研究对象,考察其对磷的吸附特性及陈化时间的影响。结果表明,铝污泥对磷的吸附容量主要受p H值的影响,当p H值由4.3升至9.0时,磷吸附容量由3.57 mg/g降为0.74 mg/g;水解试验结果显示,铝污泥中含有羟基、氯离子、硫酸根离子及腐殖质等;吸附过程中,伴随着磷酸根浓度的下降,p H值、氯离子、硫酸根离子及腐殖质呈上升趋势,表明铝污泥对磷的吸附机理主要是配位体交换。在540 d的陈化过程中,傅里叶红外光谱、X射线衍射及SEM分析结果表明,铝污泥的结构、官能团和表面形貌均未发生明显变化,表明陈化时间对铝污泥吸附磷的性能并无显著影响。 相似文献
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化学生物絮凝工艺去除城市污水中重金属的研究 总被引:1,自引:0,他引:1
采用化学生物絮凝工艺处理上海市的低浓度城市污水,考察了对污水中重金属的去除效果,探讨了化学生物絮凝工艺反应的实质。平行对比试验结果显示:化学生物絮凝工艺中存在着化学和生物的协同作用,是一种深度集成的污水强化一级处理工艺。在相同的加药量下,该工艺在减少絮凝产物中铝含量的同时,可去除部分有害重金属元素且效果优于化学强化一级处理工艺。对铝的去除率比单一的化学絮凝工艺提高了106%;在重金属元素去除方面,对铬和锰的去除率提高了10%~15%,对镍元素的吸附量也有一定的提高。但是该工艺在处理高浓度污水时,处理效果会受到重金属浓度的制约。 相似文献
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通过改变人工合成污水的浓度、流量和污泥浓度 ,探讨有机污泥负荷对无回流间隙曝气系统 ( Non-Backflow Intermittent Aeration System,缩写为 NBIAS)脱氮除磷和有机物去除效果的影响。试验表明 ,在通过改变进水流量或浓度而引起污泥负荷变化的条件下 ,当进水 CODcr为 3 0 0~ 40 0 mg/ L,流量为 0 .5 L/ h,污泥浓度为 2 .0 g/ L(对应污泥负荷为 0 .3 g CODcr/ ( g MLSS· d) )左右时 ,系统去除有机物、氮、磷总体效果最佳 相似文献
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研究了改性钢渣吸附除磷影响因素、等温吸附线特征和吸附动力学,并对生物处理后的出水进行吸附除磷研究。结果表明:在初始磷浓度10mg/L,投加量10g/L、pH为7时,改性钢渣吸附后总磷浓度为0.687mg/L,去除率达93%;改性钢渣对磷的吸附符合Langmuir模型,理论饱和吸附量是1.977mg/g,吸附动力学符合准二级动力学模型(R20.99);实际生活污水的吸附除磷中,投加量为50g/L,反应2h后出水总磷浓度达到《城镇污水处理厂污染物排放标准》(GB18918—2002)一级B标的排放要求。 相似文献
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从生态中求生存--德国盖尔森基辛日光村的启示 总被引:1,自引:0,他引:1
德国的北威州通过“北威州的50个日光村”计划,致力于太阳能利用和低能源消耗的建筑这项激进的革新。作为首批的盖而森基兴——俾斯麦日光村不但表现出能源革新的理念,而且出色地把经济的、社会的、生态的和城市的理念结合在一起。 相似文献
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当前监理企业在迅速发展的同时也潜伏危机,其原因除监理人员的素质外,就是监理企业内部的基础管理问题。本文介绍本公司近几年开展管理活动的具体做法。 相似文献
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住宅是专供居住的房屋。随着国民经济的增长,生活水平的提高,现代的居民对住宅的功能也有了更进一步的认识。住宅不仅是居住的地方,更是娱乐、休息、享受的场所。因此,人们越来越倾向于个性的生活方式,对住宅的舒适度、室内设计也就有了一定的要求。 相似文献
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A.F. Roberts 《Fire Safety Journal》1982,4(3):197-212
When a flammable liquid with a vapour pressure greater than atmospheric is released from pressurised storage, flash evaporation occurs. The ignition of such a release is likely to create a fireball which creates a short lived, but intense, source of thermal radiation.The influences of the flash evaporation process on the mechanism of flammable cloud formation and the subsequent burning of the cloud are discussed. Published information is reviewed to provide insight into those features of fireball behaviour that are influenced by the initial degree of flash evaporation and those that are not. Correlations are presented that represent consensus views on the influence of mass of flammable substance in the release on fireball diameter, duration, and radiation output. 相似文献
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There is wide concern in developed countries that groundwater resources are deteriorating in the long-term, both in quantity and quality. Some causes of pollution have a largely agricultural origin of which nitrates and pesticides are thought to pose serious risks to human health. This paper briefly reviews the sources of agricultural pollution of groundwater and the extent of the problem. It summarizes the various processes which take place in aquifers to remove, alter or attenuate contaminants. 相似文献
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A laboratory study was conducted to determine the effects of anaerobic vs aerobic conditions, sterile vs non-sterile conditions and mixing on the release of soluble ortho-phosphate from sediments obtained from Lake Carl Blackwell, Oklahoma. Eight laboratory systems reflecting various combinations of the three environmental conditions to be studied were investigated for a 30-day experimental period. Phosphate release under non-sterile conditions exceeded the release observed under sterile conditions in all systems regardless of whether they were anaerobic, aerobic, mixed or static. In addition, mixing enhanced phosphorus release under all the conditions investigated.Release of phosphate was observed under both anaerobic and aerobic conditions. Anaerobic release was greater than aerobic release in all cases except for two. The average release obtained in the aerobic mixed non-sterile systems was greater than the average release observed in the anaerobic static sterile systems and was equal to the average release observed in the anaerobic static non-sterile systems. This higher release under aerobic conditions could probably be attributed to mixing. 相似文献