亚硝酸盐反硝化颗粒污泥的二次启动试验研究

接种0～4℃贮存2个月亚硝酸盐反硝化颗粒污泥,以甲醇为电子供体、亚硝酸盐为电子受体在USB(上流式污泥床)反应器内进行二次启动。结果显示,在逐步提高进水负荷下,约46 d完成了反应器二次启动,污泥床负荷达到3.43 g N/（L·d）,NO₂-N去除率为99%;在稳定运行阶段,当进水NO₂-N浓度为50 mg/L、负荷从1.7 g N/（L·d）逐步提高至5.1 g N/（L·d）时,NO₂-N去除率均大于98%;当表观流速为2.68 m/h、进水负荷逐步提高至8.0 g N/（L·d）时,脱氮率下降至63%,过程中污泥床最大去除速率约为5.7 g N/（L·d）。研究认为,亚硝酸盐颗粒污泥床具有稳定和去除效率高等特点。     

甬江流域河网水利计算模型研究及应用

针对平原感潮河网的水文和水力学特性,结合甬江流域实际,建立了平原河网水利计算混合模型,采用Preissmann四点隐式格式,合理选定权重系数,并运用河网最优节点编码法的3级解法进行求解;利用2000年桑美台风暴雨洪水对模型进行验证计算,结果表明模型是可靠适用的.考虑不同重现期暴雨和潮位的组合情况,采用研究建立的河网水利计算模型对规划防洪工程全面实施后甬江流域河网节点水位进行了合理计算.     

中国综合减灾“十二五”规划编制思考

2009年10月1日是新中国成立60周年的日子,中国正面临多方位的检视,其核心问题之厂是未来中国安全发展的途径。2009年5月26日,由本人出任课题组长的北京减灾协会完成了北京市发展与改革委员会下达的“十二五”期间北京市提升城市综合减灾应急管理水平的重点、思路及对策研究》项目申报书,     

Dynamic Evaluation on Regional Tourism Competitiveness： Urban Agglomeration of Shandong Peninsula, Eastern China

The article establishes the appraisal index system for entire urban agglomeration and its interior cities individually, concretely including five aspects： driving forces for tourism development, the level of tourism development, tourism impacts, tourism economic connection and tourism contributions of different cities to the whole urban agglomeration. As tourism competitiveness has the characteristics of comprehensiveness, systematicness and dynamicness, the article attempts to apply the structural prediction means of system dynamics to evaluating tourism competitiveness, aiming to provide some research methods and analysis ideas for tourism competitiveness measurement and trends analysis in urban agglomeration. Taking Shandong Peninsula urban agglomeration as the study area, the article simulates and analyzes the tourism competitiveness trend of the whole region and its interior cities from 2005 to 2020, and the result reflects that integrated development and regional combination of tourism are important means to upgrade tourism competitiveness in this region.     

Potential utilization of riverbed sediments by hydrothermal solidification and its hardening mechanism

Hydrothermal solidification of riverbed sediments (silt) has been carried out in a Teflon (PTFE) lined stainless steel hydrothermal apparatus, under saturated steam pressure at 343–473 K for 2–24 h by calcium hydrate introduction. Tobermorite was shown to be the most important strength-producing constituent of the solidified silt. A longer curing time or a higher curing temperature was shown to be favorable to the tobermorite formation, thus promoting strength development; however, overlong curing time (24 h) seemed to affect the strength development negatively. The hardening mechanism consisted of the crystal growth/morphology evolution during the hydrothermal process. The species dissolved from the silt were precipitated first as fine particles, and then some of the particles seemed to build up the rudimental morphology of calcium silicate hydrate (CSH) gel. The CSH gel, with precipitated particles, appeared to cause some reorganization within the matrix, which made the matrix denser and thus gave an initial strength development. Tobermorite, transformed inevitably from the CSH gel, reinforced the matrix with its interlocked structure, and thus further promoted the strength development.     

浅谈小型水电站建设工程中的安全管理

由于小水电站建设工程相对于大中型水电工程规模小、地处偏远山区、信息滞后以及对小型水电站建设工程安全问题认识不足等原因,有的安全措施得不到很好落实,不安全事件或事故时有发生。加强小水电站建设工程安全管理,认真落实国家有关安全法规、条例和规章制度,防止不安全事件的发生,在保证安全的前提下,又快又好又省地完成水电站建设工程项目,尤为重要。     

爆炸性气体环境危险区域划分方法改善探讨

本文在对当前爆炸性气体环境的危险区域划分存在的主要问题及其原因分析的基础上,探讨了通过建立爆炸性气体环境危险区域计算机辅助划分平台,提高危险区域划分的可操作性,从而实现爆炸性气体环境危险区域划分方法的改善.探讨了通过运用数值计算方法,基于fluent对爆炸性气体扩散进行研究,对非对称分布场所的危险区域划分提供划分辅助.     

含溴氨酸体系中菌株NAX的生长及其吸附特性

从污染土壤筛选到的菌株NAX能在含溴氨酸的体系中生长,并能吸附溴氨酸。随碳源浓度的增加,菌体生长旺盛。体系中高浓度的溴氨酸和盐度抑制菌株生长。菌株对溴氨酸的吸附等温线数据用改型的Pearl生长模型拟合比用Freundlich方程好。这意味菌株吸附溴氨酸存在多层吸附机理。     

气相色谱法测定工业废水中联苯与菲

文章研究了一种新的测定废水中联苯及菲含量的方法,该方法采用气相色谱薄涂柱,对联苯与菲进行了有效的分离与测定。该方法具有固定液用量少,柱温低,分离效果好,分析速度快等特点,利用该对废水样进行了测定,取得了满意的结果。     

吉林省松花江中下游污染物排放总量控制

分析了实施总量控制的理论依据 ;并以此研究吉林省松花江中下游污染物总量控制以及吉林市控制单元的总量控制方案 ;最后探讨了总量控制措施。