排序方式: 共有29条查询结果,搜索用时 15 毫秒
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章根据广州荔湾湖清淤截污前后水质监测结果、水生物藻类和鱼类鉴定及荔湾湖周边植被调查进行综合分析,结果表明:荔湾湖水质有了一定的好转,生物多样性也有明显改善,但湖水水质仍处于富营养状态,部分污染物浓度仍较高。因而,荔湾湖的环保工作应进一步加强,使该湖区水质达到广州市水质标准。 相似文献
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Lei Shen Yuntao Guan Guangxue Wu Xinmin Zhan 《Frontiers of Environmental Science & Engineering》2014,8(5):776-783
Nitrous oxide (N2O) is a greenhouse gas that can be released during biological nitrogen removal from wastewater. N2O emission from a sequencing batch reactor (SBR) for biological nitrogen and phosphorus removal from wastewater was investigated, and the aims were to examine which process, nitrification or denitrification, would contribute more to N2Oemission and to study the effects of heterotrophic activities on N2O emission during nitrification. The results showed that N2O emission was mainly attributed to nitrification rather than to denitrification. N2O emission during denitrification mainly occurred with stored organic carbon as the electron donor. During nitrification, NaO emission was increased with increasing initial ammonium or nitrite concentrations. The ratio of N2O emission to the removed ammonium nitrogen (N2O- N/NH4-N) was 2.5% in the SBR system with high heterotrophic activities, while this ratio was in the range from 0.14% to 1.06% in batch nitrification experiments with limited heterotrophic activities. 相似文献
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分段进水生物接触氧化工艺处理河道污水的试验研究 总被引:5,自引:1,他引:5
选择滇池入湖污染负荷最高的大清河为对象,以分段进水生物接触氧化(SFBC)工艺对河道污水开展了分流处理的试验研究,已完成冬季枯水期、春季枯水期及夏季丰水期3个时期的研究.结果表明.SFBC工艺对水质变化具有很好的适应性,调整各时期的运行参数,可以使COD及TP的去除率分别稳定在50%和40%左右,但TN的去除受水温及溶解氧等的影响很大,在逐渐稳定后去除率可达到20%左右.接种活性污泥可以加快装置的启动.但总体去除效果不及来水自然驯化的污泥.随着运行时间延长以及来水带入河道底泥的影响.有无接种污泥在处理效率上的差别逐渐消失. 相似文献
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喀纳斯湖是我国最深的淡水湖,湖水面积40km2,湖水里生物量很可观,现已知有9种鱼,濒于灭绝的“哲罗鲑”(大红鱼)确实存在。1968年喀纳斯湖被列为国家级自然景观保护区,主要保护湖泊,森林和野生动物。 相似文献
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白洋淀湿地水质与水生物相关性研究 总被引:4,自引:1,他引:4
水质与水生物间关系是湿地生态学的研究热点,研究成果可为湿地水生态修复提供科学依据.在白洋淀湿地设置14个采样点,选取9个水质因子、4类11个水生物指标,利用冗余分析(RDA)方法对其进行研究.结果表明,白洋淀湿地水质和水生物相关性显著,前两个排序轴水质与水生物的相关系数分别为0.973和0.821,特征值分别是0.862和0.059.DO、NO3--N、SD、TN和TP是影响水生物的主要水质因子,第一排序轴与NO3--N和DO显著正相关;第二排序轴与SD显著正相关,与TN和TP显著负相关.比较可知,NO3--N、DO对浮游动植物影响显著,特征值占主要水质因子总特征值的89%;SD、TN和TP对底栖动物及大型水生植物影响大,特征值占主要水质因子总特征值的94%. 相似文献