水生植物压滤液厌氧发酵条件试验

Anaerobic fermentation of hydrophyte press filtrate

摘要: 以沉水植物伊乐藻(Elodeanuttalli)和微齿眼子菜(Potamogetonmaackianus)以及挺水植物喜旱莲子草(Alternantheraphiloxeroides)的压滤液为发酵原料,在中温批量液态发酵条件下,研究厌氧污泥接种量和不同氮添加水平对产气能力的影响。结果表明:在发酵时间为10d,污泥接种量为200mL·L^-1时,获得的产气量最大,为863.2mL,所产气体中甲烷含量为720～750mL·L^-1,发酵液的COD_Cr最大去除率为90%。添加1g·kg^-1尿素-氮可促进3种水生植物压滤液的发酵产气,使微齿眼子菜、伊乐藻和喜旱莲子草的压滤液发酵产气量分别提高2%,10%和30%,说明尿素-氮对喜旱莲子草压滤液发酵产气的促进最大。

Abstract: Elodea nuttalli,Potamogeton maackianus and Alternanthera philoxeroides were crushed,pressed and then filtrated to get filtrate of hydrophyte as fermentation material.Effects of varying levels of anaerobic sludge and additional N on liquid state fermentation were studied.The results show that highest biogas production（863.2 mL）in which CH₄ content was 720～750 mL·L^-1 in produced biogas and COD_Cr removal rate（90%） were reached within 10 days after 200 mL·L^-1 of anaerobic sludge was added.Biogas production from anaerobic fermentation of press filtrate of Elodea nuttalli,Potamogeton maackianus and Alternanthera philoxeroides was increased by 2%,10% and 30%,respectively,when 1 g·kg^-1 N was （added）.