机械强化污泥回流式一体化活性污泥法的运行机理研究

活性污泥通过机械搅拌强化污泥内循环回流,提高了污泥的活性,并且使污泥浓度可达到4.5kg/m3,用该机械强化污泥回流式一体化活性污泥法处理小区生活污水,当水力停留时间为3h,溶解氧为2.2mg/L,机械搅拌速度为250r/min时,CODcr、氨氮去除率均可达到83% 以上,出水达到国家污水排放一级标准.该一体化活性污泥法简单易行,运行成本低,投资小,操作维护方便,是生活小区生活污水适宜的处理工艺技术.     

ZDMC絮凝剂工业应用研究

叙述采用两种复合配方分阶段在炼油厂净化水车间一级浮选池进行工业应用试验，并与车间现用絮凝剂PAFC进行对比，试验结果表明：PAFC20＋ZDMC5的除油效果与PAFC的相当，浮渣产生量比PAFC减少26％，药剂费用低，药剂用量少，值得推广应用。     

减振复合钢板的成形性及其数值模拟研究进展

减振复合钢板是一种应用于汽车覆盖件方面的新型材料 ,有利于减振和减轻重量。介绍了其成形性和成形过程数值模拟的研究进展 ,并对未来发展进行了展望     

俄罗斯环境试验系列标准通用要求内容介绍与分析

详细地介绍了俄罗斯环境试验系列标准中通用要求,包括对试验样品要求,组装等级确定原则,试验大气条件和试验条件容差,试验项目分组、试验项目顺序和操作顺序考虑原则,试验样品安装和传感器布置要求,试验中负载和包装考虑原则,以及外观检查和功能性能检测考虑因素等。这些要求或规定相对于美军标810和GJB150等其他国内外同类环境标准要详细具体得多,很有实用价值。     

燃煤倒焰窑烟尘治理方案初探

结合某燃煤倒焰窑烟尘治理的实践 ,探讨炉前治理技术解决烟尘污染问题的方法 ,介绍了催化燃烧方法的基本原理以及燃烧装置、控制系统等的设计方法 ,分析了该系统的优缺点并提出了改进的方法     

水中铜的应急监测分析方法与常规分析方法的比较研究

应急监测工作是突发性环境污染事故处理处置中的重要环节 ,本研究采用水质应急监测仪器 ,并通过方法对照工作 ,确定了对水中铜的应急监测的快速分析方法 ,使其可以在无电源、无水源、无实验平台的现场快速分析水中的铜 ,分析一个样品的时间只需要 3min ,并且可以达到常规监测所要求的准确度和精密度     

铁蓝—活性炭生物膜法处理彩色胶片水洗废水的研究

定影漂白废话水用铁蓝法预处理，结果表明，以硫酸亚铁为沉淀剂，投加量为铁氰化物理论值的１．３倍，ＣＮ去除率为９８％，反应生成的普鲁士蓝纯度较高，可供综合利用，铁蓝法除ＣＮ后的出水与显影冲洗废水混合，再经生炭生物膜法处理，ＣＯＤｃｒ去除率为８０％；     

Genetic amniocentesis in biamniotic twin pregnancies by a single transabdominal insertion of the needle

We present a technique to aspirate amniotic fluid from both sacs in biamniotic twin pregnancies using a single abdominal insertion with a spinal needle. It was successful in 48 out of 55 cases of biamniotic twin pregnancies referred to our perinatal unit between 1985 and 1994. The single insertion technique was used when the inter-amniotic membrane was clearly evident and two separate free amniotic fluid pools could be reached by the operator with a single puncture. An adequate amount of amniotic fluid was sampled from both sacs to make a cytogenetic diagnosis in all cases. There were four fetuses with trisomy 21 in three twin pregnancies. In two cases, only one twin was affected whilst the co-twin was normal, so that a selective feticide was performed. No miscarriages due to genetic amniocentesis were reported. After 1990, all genetic amniocenteses in biamniotic twin pregnancies (except for one case due to late booking) were performed between 14 and 15 weeks of gestation and with all cases except one, it was possible to sample both twins by a single puncture. We suggest that early amniocentesis (14–15 weeks) by a single abdominal puncture could be a reliable and safe alternative to first-trimester chorionic villus sampling in twin pregnancies.     

Eco-environmental information system of Tianjin City─Design, implementation and applications

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辽东湾海冰晶体结构及其内部叶绿素的初步研究

本文介绍了１９９６年冬季首次辽东湾生态环境调查中的海洋背景条件。扼要地阐述了辽东湾海冰一般概况，分析辽东湾冰样晶体结构、存储条件及其与冰内和冰下海水叶绿素之间的关系。辽东湾冰内叶绿素符合其它结冰海区的一般规律。根据辽东湾冰层底部实测盐度变化规律阐明海冰对冰下海水营养盐的贡献。最后对深入开展结冰海区生态环境调查工作的技术、侧重点和意义做了讨论。