生态沟渠对中华鳖温室养殖排放水体的净化效果

研究采用生态沟渠技术体系——"水生植物(凤眼莲,Eichhornia crassipes)-微生物(枯草芽孢杆菌,Bacillus subtilis)-水生动物(螺蛳,Margarya)"共生系统联合净化处理中华鳖温室养殖排放水体,并连续数月采样分析处理污水中各项主要营养盐污染物指标的动态变化规律。结果表明:经过近5个月的生态沟渠技术体系处理,中华鳖温室养殖排放水体中总氮(TN)浓度减少75%,铵氮(NH4+-N)浓度减少91%,总磷(TP)浓度减少83%,化学需氧量(CODCr)减少62%,溶解氧(DO)增加近4倍,水体酸碱度(pH)维持在中性水平,处理污水由初始的黄色或棕色、浑浊逐渐转变为微黄色、微浑浊,且无异味。由此可知,利用生态沟渠技术体系——"水生植物-微生物-水生动物"共生系统联合修复中华鳖温室养殖排放水体效果显著,具有良好的推广和应用前景。

Purifying Effect of Eco-ditch on Effluent from Greenhouse-culture of Chinese Soft-shelled Turtle(Pelodiscus sinensis)

The purifying effect of the eco-ditch technology system,which combined with "aquatic plants(water hyacinth,Eichhornia crassipes)-microbes(Bacillus subtilis)-aquatic animals(snail,Margarya)",on the effluent from greenhouse-culture of Chinese soft-shelled turtle(Pelodiscus sinensis) was studied.Change of each main nutrient pollutant indicators of the treated water sample was analyzed continuously for several months.The results showed that: Total nitrogen(TN) concentration of the treated water decreased 75%,ammonia nitrogen(NH+4-N) concentration decreased 91%,total phosphorus(TP) concentration decreased 83%,chemical oxygen demand(CODCr) decreased 62%,dissolved oxygen(DO) content in water increased nearly four times,and the water pH maintained at a neutral level,by utilizing the eco-ditch technology system to purify the effluent from the greenhouse-culture for nearly five months.During the experiment period,the treated water also gradually changed from initial yellow or brown turbidity into a slightly yellowish turbidity,and no odor.It could be seen that,the purifying effect of using eco-ditch technology system,which combined with "aquatic plants-microbes-aquatic animals",to remediate the effluent from greenhouse-culture of Chinese soft-shelled turtle was very significant,thus,it could be concluded that the eco-ditch technology system had good prospects of promotion and application in effluents purification of other fresh water fish culture.