共查询到18条相似文献，搜索用时 93 毫秒
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针对华锦集团废水处理及回用工程采用纤维滤池深度处理化工混合废水技术,使其出水达到《城镇污水处理厂污染物排放标准》(GB18918—2002)一级A排放标准,研究主要对纤维滤池的原理、设计参数、运行效果等进行实践探讨。运行结果表明:在稳定运行阶段,可实现进水量2 100 m3/h。进水化学需氧量(CODCr)平均浓度为50 mg/L,悬浮物(SS)浓度为15 mg/L,浊度平均浓度为15 mg/L,处理出水CODCr≤30 mg/L、SS≤10 mg/L、浊度≤10 mg/L。该工艺处理效果稳定,对SS和浊度处理效果显著。 相似文献
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以沈阳浑南垂直流人工湿地模拟系统为研究对象,考察了湿地模拟系统对生活污水的处理效果,重点研究了不同水力负荷的影响。结果表明,垂直流湿地模拟系统对生活污水具有较好的处理效果,出水NH4+-N、TP、CODCr和BOD5均达到了《城镇污水处理厂污染物排放标准》（GB18918-2002）一级A 标准;水力负荷为0.156 t/m2•d时,是垂直流湿地模拟系统运行的最佳负荷。 相似文献
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以生活污水为供试水样,通过讨论曝气时间、污泥负荷、厌氧好氧时间分配、pH值等因素对SBR反应器中污水COD去除效果的影响进行研究。结果表明:在室温(20±5)℃和进水pH值为6.45—7.55条件下,SBR反应器优化的运行参数为厌氧150 min、曝气120 min、沉淀60 min,污泥负荷为0.049—0.082 kg BOD5/kg MLSS,MLSS 3000—5000 mg.L-1。在此条件下,COD、BOD5、NH3—N、TP和SS的平均去除率分别为85.45%、95.23%、80.25%、95.04%和85.84%,出水水质可满足城镇污水处理厂污染物排放标准(GB18918-2002)一级A。 相似文献
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我国目前正处于城市化快速发展阶段,随之而来的城市雨水资源的大量流失和污染严重的雨水径流及由此引起的城市洪灾和生态环境破坏等问题引起了人们的高度关注。对开发区雨水利用可行性分析结果表明:开发区雨水收集量可占总用水量的2.5%—8.0%,可节约用水费用12%—20%;与污水回用相比,在污水量小于5 000 m3/d时,采用雨水收集利用更加经济可行。因此,提出在区域规划层次上,应提高对城市雨水利用对策的重视,充分发挥区域规划环境影响评价宏观控制、协调的作用。 相似文献
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以秭归县防雷中心2002年7月针对该县县城污水处理厂的污水处理系统所做的综合防雷工程为实例,从防直击雷、接地及等电位连接、防雷电感应和雷电波侵入三个方面论述了有关污水处理系统综合防雷工程的设计思路,并从防直击雷施工、接地及等电位连接施工两个方面简要介绍了有关污水处理系统综合防雷工程的施工技术。 相似文献
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1引言鹤岗市污水处理厂对污水的处理净化分成多个过程来完成．在过程控制中分段采用几个独立的PLC系统进行控制,对其中的PLC系统加装电源型电涌保护器和信号型电涌保护器．围绕PLC控制机房敷设了环形地网,对机房内设备进行了等电位连接。本文主要探讨其中一个污水池开关量信号线在安装信号保护器过程中遇到的问题。 相似文献
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探讨了有关自动气象站建设初期的技术保障机构和运行机制,保证其正常运行以及在建设过程中应注意的问题.对自动气象站初期的基础设施建设、通信传输、设备的计量以及使自动气象站有效运行提出了一些实用的方案. 相似文献
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浅谈四川省自动气象站发展思路 总被引：1，自引：0，他引：1
探讨了有关自动气象站建设初期的技术保障机构和运行机制，保证其正常运行以及在建设过程中应注意的问题。对自动气象站初期的基础设施建设、通信传输、设备的计量以及使自动气象站有效运行提出了一些实用的方案。 相似文献
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污水处理厂运行过程中大量释放甲烷（CH4）和氧化亚氮（N2O),是重要的人为温室气体排放源。基于2005—2015年统计资料和IPCC核算方法,估算了2005—2015年中国生活污水处理厂CH4和N2O排放,分析了其排放特征和影响因素;依据碳中和愿景设定3种减排情景（低减排、中减排和高减排),并预估了2020—2050年排放趋势和时空变化。结果表明：2005—2015年间污水处理厂温室气体排放量呈稳定增长趋势,CH4从1135.37万t CO2e上升至1501.45万t CO2e,N2O从2651.08万t CO2e上升为2787.05万t CO2e,年均增速分别为2.8%和0.5%。3种减排情景下,2020—2050年CH4和N2O排放量时间上呈先增后减趋势,低减排情景下CH4和N2O排放量分别于2036年和2025年达到峰值,分别为2431万和2819万t CO2e;中减排情景和高减排情景下CH4峰值点分别出现在2027和2025年,而N2O排放峰值均出现在2025年。2050年中减排和高减排情景下CH4排放量相较于低减排情景减排率约为47%和94%;2050年低减排、中减排和高减排情景下N2O排放量相较于2015年分别减排了12%、53%和95%。CH4和N2O排放量在空间上差异显著,华东地区排放量高,西北地区排放量低,东南区域所在省份排放量整体高于西北区域省份。影响因素中的经济发展程度与温室气体排放量密切相关。 相似文献
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水资源关系着国计民生。太原市水短缺和水污染已成为城市经济可持续发展的“瓶颈”。从水资源的特性和太原市水资源现状出发,探讨了太原市水资源问题的成因,提高实施节水战略,加大治污和污水回用力度,是最大限度发押有限水资源社会、经济、环保效益的保证。指出开发空中水资源和实施跨区域调水,是解决太原市水资源总量问题的有效途径,是保护和改善太原市水环境使其步入良性循环的最佳方法。 相似文献
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This global spatially explicit (0.5 by 0.5 degree) analysis presents the nitrogen (N) and phosphorus (P) inputs, processing and biogeochemical retention and delivery to surface waters and river export to coastal seas according to the five shared socioeconomic pathways (SSP). Four systems are considered: (i) human system; (ii) agriculture; (iii) aquaculture; (iv) nature. Exploring the changes during 1980–2015 and 2015–2050 according to the SSPs shows that the natural nutrient sources have been declining in the past decades and will continue to decline in all SSPs in future decades due to massive land transformations, while agriculture, human sewage and aquaculture are becoming increasingly dominant (globally up to 80% of nutrient delivery). More efforts than those employed in any of the SSPs are needed to slow down the global nutrient cycles. One of the drivers of the proliferation of harmful algal blooms is the tendency towards increasing N:P ratios in global freshwaters and export to the global coastal seas; this is the result of increasing N:P in inputs in food production, more efficient biogeochemical retention of P than of N in river basins, and groundwater N legacies, which seems to be most pronounced in a united world that strives after sustainability. The diverging strategies to achieve UN Sustainable Development Goals 14 (life below water), 2 (zero hunger) and 6 (clean water and sanitation) therefore require a balanced management system for both N and P in all systems, that accounts for future nutrient legacies. 相似文献
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研究了污泥与煤按不同质量比例混烧后,底灰中的重金属形态分布与浸出毒性.结果表明:30:70的泥煤比使底灰中重金属硫化物及有机态和残渣态所占比例最大,即生物无效部分比例最大;在浸出毒性实验中,30:70的泥煤比使底灰重金属浸出量最小.由此推出,对环境毒害程度最小的泥煤质量比为30:70,即该实验条件下最优泥煤质量比为30:70. 相似文献
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Beatrice I. Crona Patrik Rönnbäck Narriman Jiddawi Jacob Ochiewo Sam Maghimbi Salomão Bandeira 《Global Environmental Change》2009,19(2):227-239
Coastal cities in East Africa are growing rapidly and consequently there is a rapid increase in urban sewage production, putting added pressure on already strained treatment systems. As a result, peri-urban mangroves are receiving extensive amounts of sewage but very little is know as to the ecological and societal consequences of this. However, UNEP among others advocate the use of low-cost, natural sewage treatment technology whenever possible and mangroves have been suggested as useful second stage biofilters. Because of the high resource dependency in many peri-urban coastal communities in East Africa, it is imperative to investigate potential societal impacts on local communities using sewage impacted peri-urban mangroves. Consequently this paper aims to characterize stakeholder groups currently affected by sewage impacted mangroves and thus also map vulnerabilities across local users in relation to future initiatives to use mangroves as biofilters along the East African coast. As risk perception is an important part of vulnerability, and risk perception related to sewage and pollution in an African setting has been little studied, we also aim to contribute baseline data on risk perception related to pollution across peri-urban populations in Kenya, Tanzania and Mozambique. 相似文献
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A. M. Nikanorov S. A. Reznikov A. A. Matveev V. S. Arakelyan 《Russian Meteorology and Hydrology》2012,37(7):477-484
Presented are the results of studying the content of polycyclic aromatic hydrocarbons and benz(a)pyrene in the lake water, in sewage waters of the enterprise, and in the upper 2-cm layer of bottom sediments in the area of the sewage discharge of Baikal Pulp and Paper Mill (BPPM), in bottom sediments in the north of Lake Baikal in the area of the Baikal-Amur Railroad, and in the channel and delta front of the Selenga River. The results were obtained at Hydrochemical Institute in 1981?C1989. The different content of benz[a]pyrene was determined for the first time in bottom sediments (sands and silts) for the bottom area of polygons in the mentioned regions. An intensive pollution exceeding significantly the normalized parameters for the benz[a]pyrene in bottom sediments is registered in the BPPM area only and its content in other areas does not exceed the background values on the whole. 相似文献
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