水生植物净化规模化猪场厌氧发酵水的试验研究

试验采用凤眼莲、水蕹菜、生菜净化处理厌氧发酵后的出水,初水CODcr浓度为170～230 mg/L,结果表明,在这3种水生植物的对比试验中,生菜对废水CODcr去除率最高,平均去除率为64%;水蕹菜对氨氮、硝态氮、磷和浊度的降解率最高,平均降解率分别为98.37%,24.95%,91.45%,95.31%.经过生菜处理后的废水颜色为白色,而其它均为浅黄色.经过为期一个月的静态试验表明所有出水均达到二级出水标准.通过试验认为水生植物净化低浓度猪场废水的作用除了植物本身对水体中氮、磷等营养的吸收外还应包括植物根系对悬浮物和胶体等的吸附作用以及胶体凝聚沉降的作用.

Research on decontaminating pig farm anaerobic fermentative wastewater with hydrophyte

In this experiment,Eichhornia Crassipes Snlms,Ipomoea aquatica and lettuce are used to decontaminate water disposed by anaerobic fermentation.The CODcr concentration of wastewater is between 170 mg/L to 230 mg/L.The experiment result shows that lettuce gets the best removal rate of CODcr which is 64%.Ipomoea aquatica gets the best effect for reducing NH3-N,NO3-N,T-P,turbidity,which are 98.37%,24.945%,91.45% and 95.31% respectively.In lab test,the effect of lettuce was best for purifying NH3-N.By the month of experiment,all of the test qualities for wastewater could meet the national standard for Grade 2 effluent water.Through the analysis,it can be seen that the effects of treating low concentration wastewater by plants also include roots adsorbing the suspension and colloid settling except for the plants absorbing nutrients