不同密度铜锈环棱螺对不同水体指标影响效果的研究

研究了铜锈环棱螺对2种不同水体中CODMn、叶绿素a、NH3-N、NO3-N和TP的去除效果。结果表明：铜锈环棱螺对于水体中的CODMn、叶绿素a、氮、磷等有一定的去除效果,放养密度、水质肥瘦度、培养时间等3个因素对其去除率存在显著性差异。具体表现为：放养铜锈环棱螺密度与其耗氧速率呈正相关;水体中叶绿素a含量呈现同步降低的规律,但在培养后期（7 d后）,2组不同肥瘦度水样中叶绿素含量均下降不明显,即消除率降低;随着培养时间的延长,水样中的COD含量普遍有所增加;NH3-N和NO3-N的去除率在一定条件下与放养密度、水质肥瘦度以及培养时间存在差异性。因此,针对不同肥瘦度的水体,不同的水质指标,应该选择不同的投放密度以达到比较满意的净化效果。

Short-Term Purification of Water of Stocking Different Densities by Bellamya aeruginosa

The efficiency of water purification by stocking six different densities of Bellamya aeruginosa in two water bodies was determined in thirteen days.The results showed that B.aeruginosa had short-term purification effect on water to some extent.The removal efficiency showed a certain correlation with the quality of water,the stocking densities and culture time,which showed that the density of B.aeruginosa had a positive correlation with the rate of oxygen consumption;the content of chlorophyll a in water bodies had a tendency of synchronous reduce,but showed a steady state after seven days;the content of COD slowly increased as time passes;the removal of NH3-N and NO3-N had great relationship with the quality of water,the stocking densities and time.Thus,in order to have a high efficiency of water purification,different stocking densities of B.aeruginosa must be found in different water bodies.