排序方式: 共有25条查询结果,搜索用时 0 毫秒
1.
In order to investigate the feasibility of pretreating the micro-polluted Yellow River raw water by constructed wetland, an experiment was conducted using a surface flow constructed wetland with composite plant bed. The contamination removal efficiency and their trends in the wetland treatment system were studied under different hydraulic loading rates(HLR). The contamination removal efficiencies were compared according to the seasonal change under optimum HLR. The result shows that in the same season, under different hydraulic loadings ranging from 2 to 6 m^3/( m^2 · d) at the same period, the best HLR is 4 m^3/( m^2 ·d) in the experimental system. The average removal rates of COD, TN, ammoniacal nitrogen (NH4^+-N), and TP in the constructed wetland are 38.37%, 45.97% , 39. 86% and 41.69%, respectively. According to China Standard for Surface Water Resources (GB3838 -2002) , mean effluent of COD, TN, NH4^+ -N and TP can nearly reach Grade Ⅲ, Grade Ⅴ, Grade Ⅰ and Grade Ⅰ , respectively. Furthermore, treatment efficiency of the system in summer is obvious higher than that in other seasons. The expenditure of constructing the constructed wetland with the average treating capacity of 176 m^3/d and lifetime of 20 years is 17075.00 RMB. The average disposal cost is summed up to 0. 17 RMB/m^3 , which shows that the pretreatment of the micro-polluted Yellow River raw water by constructed wetland is feasible. 相似文献
2.
张洪洋 《中国石油和化工标准与质量》2023,(21):95-97+100
地层现今水平地应力方向是地质构造、油气成藏规律、裂缝发育及开启性、井眼轨迹设计等研究工作不可或缺的重要信息。在钻井地层过程中,由于泥浆柱压力与地层水平应力之间的不平衡,容易在井壁上产生诱导缝、井壁崩落等现象。目前主要应用电成像测井获取的诱导缝产状及井壁崩落发育方位等信息,实现对现今水平地应力方向识别。然而,当井壁崩落以非典型特征发育时,应用电成像测井进行地应力方向识别可能存在较大误差。本文以电成像测井资料为基础,结合正交偶极子测井资料对目标井现今水平地应力方向进行分析,分析结果表明,在应用电成像资料进行地应力方向判断时,须充分结合声波各向异性及区域地应力资料进行综合分析,才能够获得正确的地应力方向。 相似文献
3.
惩治和预防腐败体系是党中央加强反腐倡廉工作的新举措,而电力企业作为国家的一个特殊行业,对加强反腐倡廉工作更应紧跟新形势和新要求,减少电力腐败行为的发生。为此,应该分析目前存在的问题,研究相关方面的对策以及制定出完成对策实施的措施,以全面加强电力行业反腐倡廉工作。 相似文献
4.
5.
采用潜流人工湿地对给水厂原水进行预处理,以提高进水水质,减轻水厂常规处理工艺的负荷.以松花江水为研究对象,考察了人工湿地对原水中浊度、CODmn、UV254、TN和NH4-N的处理效果.试验结果表明,在进水流量为0.8m3/d、水力停留时间为1.5d时,该工艺对浊度、CODmn、UV254、TN和NH4-N的平均去除率分别为93.71%、43.19%、17.69%、49.15%和48.92%.潜流人工湿地对原水预处理效率较高,运行稳定,可以有效减轻后续工艺的处理负荷. 相似文献
6.
文中介绍了几种阻燃耐候ABS树脂的制备方法,提出了用ASA树脂与ABS树脂做基体树脂掺混改性制备阻燃耐候合金材料,通过添加一定量的阻燃剂、光稳定剂、紫外线吸收剂及其他助剂制备出了阻燃性优良,耐候性好的ABS/ASA合金树脂. 相似文献
7.
8.
科学发展观不仅给全面反思行政法活建设实践提供了评价标准,而且为其科学定位未来行政法治建设走向提供了指南,并对行政法治的构建和完善具有重大的指导作用和现实意义。为回应法治政府建设的现实需要,行政法治建设必须牢固树立与落实科学发展观;同时,科学发展观的提出和不断发展,必将为我国行政立法、执法和行政监督、救济等制度建设提出了一系列新的课题和任务。 相似文献
9.
10.