Pretreatment of cyanided tailings by catalytic ozonation with Mn2+/O3

The increasing amount of cyanided tailings produced as a by-product has gained significant attention in recent years because of the rapid development of the gold industry and extensive exploitation of gold mineral resources. The effective use of these secondary resources is becoming an important and urgent problem for all environmental protection staff. Manganese-catalyzed ozonation for the pre-oxidation of cyanided tailings was studied and the effects of Mn2+dosage, initial sulfuric acid concentration, ozone volume flow, temperature and agitation speed on pretreatment were examined. The optimum reaction conditions were observed to be: ore pulp density 2.5%, agitation speed 700 r/min,temperature 60°C, Mn2+dosage 40 g/L, ozone volume flow 80 L/hr, initial sulfuric acid concentration 1 mol/L, and reaction time 6 hr. Under these conditions, the leaching rate of Fe and weight loss could reach 94.85% and 48.89% respectively. The leaching process of cyanided tailings by Mn2+/O3 was analyzed, and it was found that the leaching of pyrite depends on synergetic oxidation by high-valent manganese and O3, in which the former played an important part.     

径迹法累积测定室内外氡浓度

使用ＣＲ－３９探测器和探杯型氡监测器,对本所办公楼地下室及办公室内外氡浓度进行了２－６个月春夏秋冬不同季节的累积测定。对收集后的ＣＲ－３９随机扫描读数方式对结果的影响做了比较。结果表明地下室氡浓度高于其他层,室内高于室外。除个别情况外,随机扫描的影响在统计涨落范围内。     

改性核桃壳滤料对油田含油污水的过滤效果

采用亚硫酸氢镁蒸煮法对核桃壳滤料进行亲水改性,考察了改性核桃壳滤料对油田含油污水的过滤、反洗效果,探讨了改性前后核桃壳滤料的过滤过程及乳化油捕集机理。实验结果表明:在蒸煮温度为95℃、蒸煮时间为5 h、w(MgHSO_3)为5%的条件下,核桃壳滤料接触角由改性前的117.1°降至62.4°;分4批次过滤含油污水,改性核桃壳滤料的平均出水含油量为32.3 mg/L,平均油去除率为78.5%,平均浊度为7.7 NTU,平均浊度去除率为89.7%;改性核桃壳滤料的反洗效果显著改善,反洗水含油量由520 mg/L提高到840 mg/L,核桃壳滤料增重率由4.3%下降到0.2%。     

树脂吸附法处理氯霉素中间体DL-氨基物合成废水

研究了树脂吸附法处理氯霉素生产中产生的DL 1 对硝基苯基 2 氨基 1 ,3 丙二醇 (DL 氨基物 )碱解废水的工艺。结果表明 ,NG 1 0 0超高交联吸附树脂对废水中DL 氨基物具有较好的吸附性能。在试验条件下 ,废水CODCr为 72 0 0mg/L ,DL 氨基物含量为 2 86 5mg/L ,批处理 1 7BV时 ,平均出水CODCr降至 89 3mg/L ,CODCr去除率 >98% ;出水中DL 氨基物未检出 ,去除率近 1 0 0 %。树脂经稀酸脱附处理后 ,再生性能良好 ,高浓脱附液可直接回用于氯霉素生产酸性水解工艺中 ,使回收物得到有效利用     

新型滤槽除尘器配套脱硫工艺试验研究

采用半干法脱硫系统与新型滤槽除尘器相结合 ,可有效提高系统的脱硫、除尘效率。研究了影响该技术脱硫效率的主要因素。该技术集脱硫、除尘于一体 ,工艺简单 ,运行成本较低 ,尤其适用于燃煤含硫量≤ 1 .2 %的锅炉烟气的脱硫。     

基于GIS的城市抗震防灾规划信息管理系统

探讨GIS在城市抗震防灾规划中的应用模式和关键技术,设计了城市抗震防灾规划信息管理系统的基本框架,并结合郑州新区抗震防灾规划工作,介绍了城市抗震防灾规划综合数据库、震害预测分析模型以及GIS辅助决策系统的研究与实现,为规划编制和实施提供重要的数据支撑和决策依据。     

曝气生物滤池污水处理工艺与设计

论述了曝气生物滤池污水处理原理、构造及其滤料作用机理,提供了一种利用粉煤灰和粘土生产生物滤料的配方和生产工艺流程,并对当前曝气生物滤池滤料研究进行了归纳,介绍了几种曝气生物滤池工艺基本类型及其组合流程。曝气生物滤池污水处理工艺设计与计算主要包括滤料体积、滤池总面积、滤池高度、布水布气系统、反冲洗系统以及污水与滤料的接触时间等。作为实例,对水量为2500m3d小区污水曝气生物滤池(DC、DN)进行了工艺设计。     

Changes in ecological networks and eco-environmental effects on urban ecosystem in China’s typical urban agglomerations

Environmental Science and Pollution Research - Exploring the changes in ecological networks (ENs), its eco-environment effects and the differences in urban agglomerations in various urbanization...     

Development of Smart Colorimetric Sensing Films Carbohydrate-Based with Soybean Wax and Purple Cauliflower Anthocyanins for Visual Monitoring of Shrimp Freshness

Journal of Polymers and the Environment - Novel pH-colorimetric intelligent films were designed from agar and methylcellulose matrix (AM) with soybean wax (SBW) in several percentages (5, 10, 15,...