水葫芦压榨液厌氧发酵及其发酵液对青菜种子发芽和生长的影响

Anaerobic digestion of water hyacinth press juices and the effect of fermentation liquid on brassica chinensis germination

研究了水葫芦压榨液厌氧发酵过程物质的变化,分析了水葫芦压榨液的发酵液(简称发酵液)对青菜种子发芽及后续生长的影响。结果表明,厌氧发酵能显著降低压榨液中的COD,在厌氧发酵结束时,COD从5377.0 mg/L下降到730.0 mg/L,下降86.4%;TN从126.6 mg/L下降到79.7 mg/L,氮素流失37.0%,且主要发生在厌氧发酵初期;TP从31.1 mg/L下降到25.0 mg/L,下降19.6%;发酵液中悬浮物(SS)和可溶性固体(DS)分别下降到719、600 mg/L。分别用蒸馏水、水葫芦压榨液和各阶段的发酵液(发酵时间分别为6、20、27、30 d)进行青菜种子发芽试验(历时10 d),平均发芽率分别达到79%、54%、51%、82%、87%、89%。在10 d的青菜苗生长时间内,平均苗高与发酵时间呈显著正相关,说明发酵液具有作为植物液体肥料使用的潜力。

Substance changes of water hyacinth juice during anaerobic fermentation were studied. The results showed that： reduction of organic matters was obviously during the anaerobic fermentation： the removal efficiencies of COD, SS, DS and TN were 86.4%, 82.0%, 64.7% and 37.0% , respectively. The decreases were mainly occurred in the initial period of fermentation. TP presented the placidity removal speed, reduced from 31. 1 mg/L to 25.0 mg/L. The growths of Brassica chinensis seeding in different fermentation liquid were compared, which indicate that fermentation fluid could be used as the liquid fertilizer.