一体式好氧膜生物反应器的氮转化试验研究

一体式好氧膜生物反应器（Integrated aerobic membrane bio-reactor,简称IAMBR）内提供了世代时间较长的硝化菌生长环境，从而使得硝化作用增强。从氨氮浓度与亚硝酸氮浓度比值随天数变化，氨氮浓度与硝酸氮浓度比值随天数变化，亚硝酸氮浓度与硝酸氮浓度比值随天数变化角度分析了IAMBR内氮的转化情况，得出氨氮去除主要依靠膜生物反应器内的好氧污泥，并且IAMBR可用于去除氨氮的结论。     

Nitrous oxide emission from some English and Welsh rivers and estuaries

Nutrient and N₂O concentrations in the water columns were measured seasonally over a full salinity range in the nutrified rivers Colne, Stour, Orwell, Deben, Trent, Ouse and Humber and their estuaries on the east coast of England between August 2001 and May 2002, and in the oligotrophic rivers Conwy, Dovey and Mawddach in North and West Wales between August 2002 and May 2003. Nutrient and N₂O concentrations in the nutrified English rivers and estuaries were much higher than those in the Welsh rivers. N₂O concentrations and % saturation in the estuaries were significantly correlated with nitrate, nitrite and ammonium concentrations in the water. The strongest correlation was with nitrite (r² = 0.56, p < 0.01), suggesting that nitrite was the most significant factor among the different nutrients in regulating N₂O concentration in the estuaries. N₂O concentrations in the English rivers and estuaries were supersaturated throughout the year with annual averages from 186.9 to 992.9%, indicating that these rivers and estuaries were sources of atmospheric N₂O, whereas in the Welsh rivers N₂O concentrations were much lower with annual averages from 113.6 to 137.4% saturation. Although the estuarine area in the Colne was almost the same as that in the Conwy, the annual N₂O emission from the Colne was much higher (937498 mol N yr^–1) than in the Conwy (23020 mol N yr^–1). On the east coast, riverine emissions of N₂O were only 0.5–12.5% of the total emission from rivers and estuaries. Thus rivers were negligible, but estuaries were significant contributors to the UK N₂O inventory.     

闽南地区酸雨特征及其亚硝酸根检测

概括介绍了闽南地区酸雨的分布和特征 ,阐述了几种快速、灵敏、稳定测定亚硝酸根离子传感器的制备及应用。     

冻融对土－水系统中亚硝酸盐积累的影响

利用不同类型土壤－水系统，加入一定量的ＫＮＯ３溶液，进行温度和冻融对脱氮作用的影响以及亚硝酸盐积累规律的研究。培育实验结果表明，低温下，尤其是冻融条件下亚硝酸盐积累，是由于冻融加强有机质的分解及矿化作用所引起。将此结果用来解释克山病环境地球化学病因：急性克山病往往发生在冬春季节，这可能与冻融条件下水体中大量积累亚硝酸盐有关。     

包埋固定化硝化菌在不同DO下的硝化规律研究

在流化床反应器中使用包埋固定化硝化菌进行高氨氮废水的降解实验,在不同DO下考察和比较氨氮,亚硝酸氮和硝酸氮浓度随时间的变化规律和反应速率大小,以及亚硝酸氮和硝酸氮的反应速率随底物浓度的变化,认为DO=4.0mg/L时,亚硝酸氮的生成速率和积累率最大,平均速率为26.3mg/L.h。     

液体推进剂中氧化剂废水处理方法研究

介绍了一种处理导弹氧化剂废水的方法和工艺 ,用碱中和酸、尿素除NO- 2 、絮凝沉淀法除F- 和PO3- 4 ,探索了最佳处理条件 ,确定了较为合理的处理工艺     

Volatile fatty acids carbon source for biological denitrification

Ｖｏｌａｔｉｌｅｆａｔｔｙａｃｉｄｓｃａｒｂｏｎｓｏｕｒｃｅｆｏｒｂｉｏｌｏｇｉｃａｌｄｅｎｉｔｒｉｆｉｃａｔｉｏｎ￥ＸｕＹａｔｏｎｇ（ＣｅｎｔｒｅｏｆＩｎｔｅｒｎａｔｉｏｎａｌＲｅｓｅａｒｃｈｆｏｒＷａｔｅｒａｎｄＥｎｖｉｒｏｎｍｅｎｔ，Ｌｙｏｎｎ...     

广东省典型地区蔬菜硝酸盐与亚硝酸盐污染状况评价

研究了广东省西翼的湛江市、珠江三角洲地区的东莞市、惠州市、中山市、珠海市和佛山市顺德区等典型地区大型蔬菜生产基地中4种蔬菜148个样品中硝酸盐与亚硝酸盐的污染现状。采用国家标准(GB18406.1—2001)进行评价,在所检测的蔬菜样品中,有36.5%样品的硝酸盐含量超标,亚硝酸盐含量相对较低;以WHO/FAO规定的日允许摄入量换算得到的标准评价蔬菜的硝酸盐污染状况,污染程度严重的蔬菜样品占62.2%,中、重度污染的占16.9%,轻度污染的占20.9%。蔬菜中硝酸盐含量由高到低依次为叶菜类>瓜类>豆类>茄果类。因而有必要采取有效的污染防治措施控制该地区蔬菜中硝酸盐污染状况。     

饮用水生物滤池中亚硝酸盐氧化细菌的生长规律

饮用水生物滤池工艺中亚硝酸盐氧化细菌的生长状况可以作为反应器挂膜是否成功的标志，其生长具有明显的阶段性，在经历了延迟期和对数期之后进入稳定期，由于氨氧化细菌和亚硝酸盐氧化细菌在生态学上存在以后者为受利方的偏利互生关系，延迟期后期与氨氧化细菌的对数期生长相对应，表现为表观去除率的“对数下降”期．亚硝酸盐氧化细菌对数期生长的时间在1mo左右；低温可以使其长期处于延迟期．图7表3参12     

硫化氢中毒的机制及其防治

本文综述了1958～1989年间对硫化氢中毒的研究成果。硫化氢是广泛存在于自然环境及某些工作场所的无色剧毒气体,其主要中毒机制是抑制细胞色素氧化酶,中断细胞的有氧氧化。预防性给予亚硝酸盐可减轻中毒症状,但对其中毒尚无有效的解毒剂。