利用水葫芦净化养鳖废水的问题研究

Utilization of Water -Hyacinth in Purifying Waste Water from Turtle Pond(WWTP)

甲鱼的代谢废物及残余饵料是养殖水体的主要污染源,同时也是可被水生植物(水葫芦)利用的高能、优质的营养物质。针对在甲鱼废水池中养殖的用于净化水体的水葫芦经常出现幼叶发白症状的问题,采用4种处理来分析诊断其原因,即:①延长废水在水葫芦池中的停留时间;②用硝酸将原始废水的pH值调节到6.5左右;③添加微量Fe-EDTA;④先用硝酸将废水pH调至6.5左右后,再添加微量Fe-EDTA。试验表明,这4种方法均能使水葫芦克服缺绿症状而正常生长。考虑到废水处理的经济性,处理①和②具有一定的实用价值。

The effluents and the feed residues from raising pond for turtle are the main pollutants of aquaculture syste m.These waste products are characterized by high -energy and high -quality nutrients t hat may be further utilized by aquati c plant (water hyacinth).Aiming at the symptomof the tender le aves and stems of water -hyacinth often turn white while purifying WWTP(the wastewater from turtle pond),this paper describes four kinds of t reatments to evaluate and diagnose t his problem.The result showed that:(1)prolong incubating time of WWTP in the water hyacinth pond;(2)addition of HNO 3 to adjust pH value to about 6.5;(3)Addition of some trace Fe -EDTA;(4)Addition of HNO 3 to adjust pHvalue to about 6.5first and then some trace Fe -EDTA.It has bee n found that all these four methods could make the water -hyacinth disappearance of th e symptom of iron deficiency and developing healthily.In considering of economic gain the tre atments(1)and(2)exhibited to be available.