Optimization of a Photo‐assisted Fenton Oxidation Process: A Statistical Model for MDF Effluent Treatment     

Maedeh Galehdar  Habibollah Younesi  Mojtaba Hadavifar  Ali Akbar Zinatizadeh 《洁净——土壤、空气、水》2009,37(8):629-637

In the present study, the effects of initial COD (chemical oxygen demand), initial pH, Fe²⁺/H₂O₂ molar ratio and UV contact time on COD removal from medium density fiberboard (MDF) wastewater using photo‐assisted Fenton oxidation treatment were investigated. In order to optimize the removal efficiency, batch operations were carried out. The influence of the aforementioned parameters on COD removal efficiency was studied using response surface methodology (RSM). The optimal conditions for maximum COD removal efficiency from MDF wastewater under experimental conditions were obtained at initial COD of 4000 mg/L, Fe²⁺/H₂O₂ molar ratio of 0.11, initial solution pH of 6.5 and UV contact time of 70 min. The obtained results for maximum COD removal efficiency of 96% revealed that photo‐assisted Fenton oxidation is very effective for treating MDF wastewater.  相似文献   

异波折板多段两相厌氧城市污水处理工艺试验研究   总被引：2，自引：0，他引：2  

邵丕红  韩相奎  艾胜书  刘红波 《吉林大学学报(地球科学版)》2007,37(4):789-792

提出了异波折板多段两相厌氧城市污水处理工艺。通过反应器内异波折板的结构设计、液相流速设计和系统内生物相的分段调控,在提高传质效率的同时,使不同种群微生物的生化活性得到明显改善,有机污染物去除效率显著提高。实验结果表明,当水力停留时间大于10 h时,COD的去除率可达90%以上,而且受温度影响很小。  相似文献   

长春市污水资源化现状及对策     

孙弘颜  汤洁  刘亚修 《吉林大学学报(地球科学版)》2007,37(1):120-124

目前长春市水资源匮乏,水资源危机严重。城市水资源化是解决水危机、防治水污染的有效途径之一。长春市经处理的污水量为1.843 亿m³/a, 经过深度处理后回用的污水量为423.4 万m³/a,占2.297%,污水资源化利用程度不高。所建污水处理回用工程完成后,每天可增加水量16.16 万m³。通过制定政策,拓宽融资渠道以及提高环保意识等,可提高城市污水资源化的程度,实现良好的社会效益。  相似文献   

乐清湾水环境特征及富营养化成因分析   总被引：8，自引：0，他引：8  

高生泉  卢勇  曾江宁  姚龙奎  高大伟 《海洋通报》2005,24(6):25-32

根据2002-2003年乐清湾海域春、夏、秋、冬4个航次的调查资料,分析了乐清湾海域水化学要素在不同季节的分布和变化特征,探讨了陆源污水、海水养殖自身污染与富营养化的关系.结果表明,乐清湾水域DIN和DIP浓度全年平均分别为0.630mg/dm^3和0.039mg/dm^3秋、冬季几乎100%测站属劣四类水质,春、夏季近90%超过四类水质标准.水体营养状态指数（E）值各季平均在4～9,呈严重富营养化状态.研究指出沿岸工农业废水、生活污水的排放及水产养殖业的无序、无度发展是造成该水域严重富营养化的三个主要原因.认为目前乐清湾水质已不能满足该海域功能区划提出的要求,必须进行综合整治.  相似文献   

油田污水管道设备污损分析     

陈学政  韩冰 《海洋科学》2005,29(7):65-68

根据实践经验并参考近10年来的文献,从工程技术角度分析了原油处理厂处理油田采出水时遇到的腐蚀和结垢问题,从污水水质、腐蚀形态和污垢形成3个方面阐述了管道设备污损现状和原因,并分别从应用耐蚀材料、阴极保护技术、改变水质和提高工程质量4个方面提出了应对方案。  相似文献   

钾长石粉酸浸除铁废液资源化的实验研究   总被引：3，自引：0，他引：3  

郑骥马鸿文  章西焕文智慧 《地球科学》2004,29(1):59-64

钾长石粉经过硫酸或盐酸酸浸除铁后, 废液中含有大量的金属离子和游离酸.对废硫酸进行循环利用实验, 钾长石粉铁的浸出率达到88.3%.对酸浸废液进行蒸发结晶, 分别制备得到了纯度为94.1%的绿钾铁矾和74%的三氯化铁.用硫酸酸浸废液蒸发结晶后, 铁的回收率为70.0%, 钾的回收率为96.5%, 整个工艺无需高温, 无需加压, 操作简单, 具有高效、低能耗、低污染的特点, 表明用本项技术处理酸浸废液行之有效.分析认为, 废液呈强酸性、溶液中存在大量Fe2+、碱金属离子含量偏低是蒸发结晶过程中形成绿钾铁矾而不是黄钾铁矾的主要原因.   相似文献   

Pollution trend in the tumen river and its influence on regional development     

田卫  俞穆清  王国平  郭传新 《中国地理科学(英文版)》1999,9(2):146-150

１ＩＮＴＲＯＤＵＣＴＩＯＮＳｅｖｅｒｅｗａｔｅｒｐｏｌｕｔｉｏｎａｎｄｗａｔｅｒｒｅｓｏｕｒｃｅｓｓｈｏｒｔａｇｅｓｈａｖｅｂｅｃｏｍｅｔｗｏｋｅｙｏｂｓｔｒｕｃｔｉｏｎｓｔｏｒｅａｌｉｚｅｓｕｓｔａｉｎａｂｌｅｕｔｉｌｉｚａｔｉｏｎｏｆｗａｔｅ...  相似文献   

耗氧速率(OUR)测量方法的实验研究   总被引：4，自引：0，他引：4  

李冰  孙英兰  李玉瑛 《中国海洋大学学报(自然科学版)》2006,36(3):456-460

目前多采用分批实验法和呼吸测量仪测量耗氧速率,而耗氧速率的测量对于研究活性污泥数学模型中的动力学参数及废水特性鉴定具有重要意义。本文根据OUR测量方法的基本原理设计了1种简易的OUR测量装置,为检验测量装置的有效性,设计了相关实验进行验证。在内源呼吸实验中,测定了所用活性污泥的内源呼吸速率是5.1mgO2/L·h,污泥的衰减系数是0.0137h-1,比文献值略高。基质降解实验对人工配水(葡萄糖和淀粉)的耗氧速率进行了测定,实验结果显示有3个显著不同的耗氧速率,分别为35mg/L·h,13mg/L·h,6mg/L·h,它们各代表葡萄糖降解、淀粉降解和内源呼吸的速率。内源呼吸速率高于前1个实验是由于基质降解过程中污泥量增加所致。并计算出异养菌产率系数Kd为0.63mgVSS/mgCOD,Kd略低于文献值。实验结果证明,该装置能很好的实现测量目的。  相似文献   

Intra-annual variability of urban effects on streamflow     

Jeremy E. Diem  Luke A. Pangle  Richard A. Milligan  Ellis A. Adams 《水文研究》2021,35(9):e14371

While considerable research has established the impacts of urbanization on streamflow, there has been little emphasis on how intra-annual variations in streamflow can deepen the understanding of hydrological processes in urban watersheds. This study fills this critical research gap by examining, at the monthly scale, correlations between land-cover and streamflow, differences in streamflow metrics between urban and rural watersheds, and the potential for the inflow and infiltration (I&I) of extraneous water into sewers to reduce streamflow. We use data from 90 watersheds in the Atlanta, GA region over the 2013–2019 period to accomplish our objectives. Similar to other urban areas in temperate climates, Atlanta has a soil-water surplus in winter and a soil-water deficit in summer. Our results show urban watersheds have less streamflow seasonality than do rural watersheds. Compared to rural watersheds, urban watersheds have a much larger frequency of high-flow days during July–October. This is caused by increased impervious cover decreasing the importance of antecedent soil moisture in producing runoff. Urban watersheds have lower baseflows than rural watersheds during December–April but have baseflows equal to or larger than baseflows in rural watersheds during July–October. Intra-annual variations in effluent data from wastewater treatment plants provide evidence that I&I is a major cause of the relatively low baseflows during December–April. The relatively high baseflows in urban watersheds during July–October are likely caused by reduced evapotranspiration and the inflow of municipal water. The above seasonal aspects of urban effects on streamflow should be applicable to most urban watersheds with temperate climates.  相似文献   

Mainstreaming climate change adaptation into inland aquaculture policies in Thailand     

Anuwat Uppanunchai  Chanagun Chitmanat 《Climate Policy》2018,18(1):86-98

While there have been many pilot projects on adaptation undertaken in the fisheries and aquaculture sector, state policies are only just beginning to address let alone refer to climate change. This study explores the climate-related content, climate sensitivities, and opportunities to incorporate climate change concerns in a set of aquaculture policies by the government of Thailand. The analysis is based on content analysis of policy documents and in-depth interviews with 14 officials that had roles in the design or implementation of 8 Department of Fisheries policies. The Aquaculture Master Plan 2011–2016 and the now abandoned Tilapia Strategy refer directly to climate variability or change. The Master Plan also suggests measures or strategies, such as investment in research, and the transfer of technologies, which would be helpful to sustainability and adaptation. Other policies suggest, or at the very least include, practices which could contribute to strengthening management of climate-related risks, for example: a registration policy included provisions for compensation; extension programme policy recognizes the importance of extreme events; and a standards policy gives guidance on site selection and water management. Most existing aquaculture policies appear to be sensitive to the impacts of climate change; for instance, the zoning policy is sensitive to spatial shifts in climate. Stakeholders had ideas on how policies could be made more robust; in the case of zoning, by periodically reviewing boundaries and adjusting them as necessary.

POLICY RELEVANCE

This study is one of the first evaluations of the coverage and sensitivity of aquaculture policies to climate change. It shows that while existing policies in Thailand are beginning to refer explicitly to climate change, they do not yet include much in the way of adaptation responses, underlining the need for identifying entry points as has been done in this analysis. Further mainstreaming is one option; another possibility is to adopt a more segregated approach, at least initially, and to collect various policy ideas under a new strategic policy for the aquaculture sector as a whole.  相似文献