Anaerobic fermentation of hydrophyte press filtrate

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）.