羊蹄植株的水培养以及对污水的净化作用研究

用武汉沙湖污水培养不同大小羊蹄植株,以观察羊蹄植株的生长状况,结果表明:湿生植物羊蹄完全可以悬浮生长于污水之中,且生长极好,当培养1d后可长大量新须根(0.3—0.5cm),培养到第12d可长须根23.5cm左右;测定其生物量时发现植株越大其生物量增加越大,但植株越小其净增加生物量越大(每克植物每天的增加量);当测定羊蹄对污水的蒸腾加蒸发量时,发现最大量达到420mL/d,12d总量达1820mL,由于羊蹄植株的作用使污水的透光率由96上升到99.1(自来水为100),即较浑浊的污水已变为几乎透明的清水,通过测定污水的污染指标发现,由于6号羊蹄植株的净化使污水COD由原来的49mg/L降为28mg/L、氨氮由原来的328mg/L降为82mg/L、磷由原来的2.931mg/L降为0.124mg/L,因此,本实验证明了羊蹄植株是治理污水的优良品种之一。

THE RESEARCH ON CULTIVATING OF RUMEX JAPANICUS HOUTT IN SEWAGE AND ITS PURIFICTION FUNCTION

Cultivating Rumex japonicus Houtt(picked from the shore of Shahu Lake around campus of Hubei University)in sewage of Shahu Lake in order to observe the growth state of them,the results showed that R. japonicus Houtt can give birth very well in sewage, that every line of plant could bring about many fibrous roots which reached 0.3cm to 0.5cm in the first day and that the longest fibrous roots reached about 23.5cm during 12 days. The experiment also showed that biggest plant of them could produced largest biomass and the maximum evapotranspiration which get to 420ml per day and the total volume of evapotranspiration was 1820ml during 12 days, But the smaller is R. japonicus Houtt,the bigger increased net biomass (daily increasing weight per g); Because of purification function of R.japonicus Houtt,the sewage became nealy clear and the transmissivity increased from 96 to 99.1(while tap water is 100),namely more muddy sewage had already turned into nearly transparent water. After determining the pollution index of sewage, it was the purification function of R. japonicus(No.6)that COD of sewage was changed from 49mg/L to 28/L and its N-NH_3 from 328mg/L to 82mg/L, its P from 2.931mg/L to 0.062mg/L.,In a word, All results indicated that Rumex japonicus Houtt is a kind of better plant fitting for sewage treatment.