微量元素对ABR发酵产氢产甲烷的影响

为构建厌氧折流板反应器(ABR)发酵联合产氢产甲烷系统,考察了微量元素对ABR系统前端格室发酵产氢、后端格室发酵产甲烷的影响。在进水COD为6 000 mg/L、碱度为1 900 mg/L的条件下,当未投加微量元素时,系统对COD的去除率为51%,产氢能力为0.46 m3/(m3.d),产甲烷能力为0.68 m3/(m3.d),四格室的厌氧污泥脱氢酶活性均较低;而在相同运行条件下,当投加微量元素后,系统对COD的去除率提高到62%以上,产氢能力为0.37 m3/(m3.d),产甲烷能力达到1.66 m3/(m3.d)。研究表明,投加微量元素可有效刺激ABR发酵联合产氢产甲烷系统中厌氧污泥的活性,由于ABR中产甲烷菌等耗氢菌群活性的增强导致发酵产氢作用受到抑制,但产甲烷活性的进一步增强,使系统的处理效能得到明显提高。

Effect of Trace Elements on Fermentative Co-production of Hydrogen and Methane in Anaerobic Baffled Reactor

In order to achieve fermentative co-production of hydrogen and methane in a 4-compartment anaerobic baffled reactor(ABR),the effects of trace elements on fermentative production of hydrogen in the front compartment and fermentative production of methane in the rear compartment were investigated.Under the conditions of influent COD of 6 000 mg/L and ALK of 1 900 mg/L,before addition of trace elements,the COD removal rate was 51%,the hydrogen production capacity was 0.46 m3/(m3·d),and the methane production capacity was 0.68 m3/(m3·d),with low dehydrogenase activity of anaerobic sludge.While under the same conditions,after addition of trace elements,the COD removal rate increased to above 62%,the hydrogen production capacity decreased to 0.37 m3/(m3·d),and the methane production capacity increased to 1.66 m3/(m3·d).As a result,the addition of trace elements could effectively stimulate the activity of anaerobic sludge in fermentative co-production of hydrogen and methane in the ABR.The increase in the activity of hydrogen-consuming bacteria like methanogenic bacteria leaded to inhibition of the hydrogen production,but enhanced the methanogenic activity,which significantly improved the treatment efficient.