pH对热处理污泥厌氧发酵产氢的影响

采用自制连续流厌氧发酵产氧反应器,接种经过50 min热处理的污泥,以蜜糖废水为底物,探讨pH值的变化对反应器运行中产氢和产酸的影响.在进水COD浓度为5 000 mg/L、温度为37℃、HRT为6 h、负荷为67 kgCOD/(m3·d)的条件下,分别在pH为6.0、5.5、5.0、4.5时对反应器内产氧产酸等情况进...

Effect of pH on Fermentation Hydrogen Production from Heat Pretreated Sludge

A continuous anaerobic fermentation reactor for bio-hydrogen production,50min heat pretreated sludge was inoculated and using molasses wastewater as substrate to investigate the influence of pH on fermentation hydrogen production and VFAs production.Under the COD of influent organic wastewater concentration 5,000 mg/L with temperature of 37℃,HRT 6h and organic loading rate of 67 kgCOD/(m3·d),biogas production capability,hydrogen content and VFAs production were examined to study the operation characteristics of the reactor at pH 6.0,5.5,5.0 and 4.5.Experiment results showed that two peak hydrogen production capability value were found in pH 6.0 and 4.5,with the best hydrogen production capability as 7.9 L/(L·d),average as 6.95 L/(L·d) and 6.75 L/(L·d) respectively.Biogas production capability decreased from 18 L/(L·d) to 10.3 L/(L·d) and hydrogen content in the biogas rose from 39% to 52% and yield of VFAs was decreased with the decline of pH,the proportion of acetate and butyrate was 53% and 36% of the total VFAs.Hydrogen production capability and hydrogen content in the biogas have a significant correlation with the proportion of acetate,butyrate and propionic.