摘要
当废水电导率(20℃)在5000μS/cm以上时,凤眼莲几天内中毒死亡。当电导率在2300μs/cm以上时,凤眼莲生长率,叶绿素含量及a/b比率下降,细胞膜透性增加。凤眼莲适宜的生长范围是电导率1700μS/cm以下。废水中有毒组分使盐分的毒性有所增加,但经活性炭过滤或让其经一段时间自然降解后,毒性明显降低。盐分还使凤眼莲净化效率降低。试验污水中COD、油、氨氮、酚等污染组分的净化效率随污水处理方式不同而有所不同,但在每一处理组中,都是盐分含量居中的试验组的净化效率最高。在本试验条件下,凤眼莲生长越旺盛,试验液中pH下降得越多。
When conductivity of wastewater was higher than 5 000 \A,S/cm, water hyacinths (Eichhornia crassipes Solms.) would die in a few days due to poisoning. When conductivity was over 2 300μS/cm, a reduction of growth rate, chlorophyll content and chl. a/b ratio of the plant occurred but the permeability of cell membrame increased. The optimum growth conditions of the plant occurred at conductivity below 1700μS/cm. The toxic components other than salts in Yanshan petrochemical wastewater enhanced the toxicity of salinity. Wheh wastewater was filtered through activated carbon or allowed to degrade naturally, the toxicity would have a remarkable decrease. It should also be pointed out that the purification efficiency of water hyacinths was related negatively with salinity. The purification efficiencies to COD, oil, ammonium-nitrogen, phenol and other pollutants in the wastewaters are different in accordance with the different methods of treatment. Among the experiments, gr/ups- of moderate salinity always revealed maximum purification efficiencies. Under the experimental, condition the more vigorously the water hyacinths grew, the greater reduction of pH in the experimental liquid occurred.
出处
《水生生物学报》
CAS
CSCD
北大核心
1990年第3期239-246,共8页
Acta Hydrobiologica Sinica
关键词
凤眼莲
盐分
生长
净化效率
Salinity
water hyacinth (Eichhornia crassipes)
growth
purification efficiency
