有机负荷对连续生物制氢反应器中氢气的影响  

Effect of Organic Loading on Hydrogen in a Continuous Bio-hydrogen Production Reactor

作　　者：郝鑫[1] 敖梓鼎 卡不贝尔 季丹丹 张伊帆 李永峰[1] HAO Xin;AO Zi-ding;John Dominick Kapumbe;JI Dan-dan;ZHANG Yi-fan;LI Yong-feng(Forestry School,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林业学院,哈尔滨150040

出　　处：《中国甜菜糖业》2019年第1期29-33,35,共6页China Beet & Sugar

基　　金：全国大学生创新项目(20181)。

摘　　要：本实验以红糖水为发酵基质,污泥为反应起始物,采用连续搅拌釜式反应器(CSTR)。在pH7.0±0.1、氧化还原电位(ORP)为-420mV、温度(35±1)℃、水力停留时间(HRT)为6h的条件下,产氢量达到稳定水平。(氢气是乙醇型发酵的主要成分)。通过保持所有其他参数的一致性,我们能够关注改变有机负荷对氢生产的影响。同时,通过调节pH值,使微生物保持较高的活性。结果表明,当有机负荷从12kg/m-d增加到32kg/m-d时,沼气和产氢速率持续增加。当有机负荷为32kg/m_-d时,最大产气速率为18.6L/d,产氢速率为6.4L/d,与原始的12kg/m_-d相比,产气量分别提高了89%和87%。在系统运行过程中,降低进水pH值至5.85,抑制了厌氧发酵的微生物活性,导致产氢速率下降,ORP增加到-328mV。在此条件下,通过在反应器中加入一定量的NaOH来调节pH值,可使反应器保持较高的乙醇型发酵产氢速率。This experiment used a continuous stirred tank reactor(CSTR)with brown sugar water as the fermentation substrate,and sewage sludge as the initiation of reaction.Hydrogen production reached a stable level under conditions of an intake of pH 7.0 ±0.1,an oxidation-reduction potential(ORP)of-420 mV,a temperature of(35±1)℃ and a hydraulic retention time(HRT)of 6 hours.(Hydrogen was the main component from the ethanol-type fermentation).We were able to focus on the impact of changing the organic load on Hydrogen production by keeping all other parameters consistent.At the same time,the microorganisms were allowed to maintain high activity by regulating the pH level.Results showed that when the organic load increased from 12 kg/m^3-d to 32 kg/m^3-d,the biogas and hydrogen production rates continuously increased.When the organic load was 32 kg/m^3-d,it reached a maximum production rate of 18.6 L/d and a hydrogen production rate of 6.4 L/d.Compared with the initial 12 kg/m^3-d,gas production improved by 89% and 87%,respectively.During system operation,lowering the intake pH to 5.85 resulted in the inhibition of microbial activity of anaerobic fermentation,resulting in a decline of rate of hydrogen production and the ORP increased to-328 mV.Under these conditions,the reactor could maintain a high hydrogen production rate of ethanol-type fermentation by adding a certain amount of NaOH in the reactor to regulate the pH level.

关 键 词：CSTR PH值 产氢量 有机负荷 乙醇型发酵 

分 类 号：TK6[动力工程及工程热物理—生物能]