采用产氢产乙酸/同型产乙酸两相耦合工艺对剩余污泥进行了半连续式厌氧发酵,主要研究了pH值和产甲烷抑制剂2-bromoethanesulphonate(BES)对耦合系统定向产乙酸的影响.结果表明:碱性pH(pH=10.0)和添加BES都能促进A相乙酸的积累,提高乙酸的产率,同时碱性pH比添加BES更有利于污泥的水解.当两种调控方法结合使用时,污泥的水解效率,A相乙酸和TVFA产率都达到最大值,分别为:63.11%、0.27 g/gVS、0.40 g/gVS;碱性pH和添加BES都非常有效的抑制了甲烷的生产.碱性pH有利于氢气生产(最高达16.96 mL/gVS),但是抑制了二氧化碳生产和释放,对H相乙酸的积累非常不利.因此当两种调控方法结合使用时,H相乙酸对整个系统的贡献率仅为7.5%,比中性条件下低的多(最高达31.7%),但是中性条件下整个系统乙酸日产量(0.99 g/d)却远低于两种调控方法结合使用时乙酸日产量(3.67g/d).%A novel coupled syntrophic acetogenesis with hom oacetogenesis process w as used to produce acetate from sew age sludge by sem rcontinuous anaerobic ferm en tation . Effects of various pH and m ethanogenesis inh ibition (2-brom oethanesulphonate , BES ) on the efficiency of acetate and gas production from excess sludge w ere investigated . The result show ed that the akaline pH and BES of the A-phase (acetogenesis phase) in prove the acetate accum ulation . A lkaline pH also m ore favorabb than BES to sludge hydrolysis. W ith pH controlat 10 .0 and BES addition , the hydrolysis yield , the yield of acetate and TV FA reached 63 .11% , 0 .27 g/g V S and 0 .40 g/g V S , respectively . A kaline pH orBES addition could rem arkably inhlbit CH4 production . A kaline pH w as conducwed to hydrogen production (up to 16 .96 m L/gV S) ,but inhibited carbon dioxide production and release , w hich w as not conducive to the accum ulation of acetic acid in Hphase. So w hen these tw o controlm ethods w ere used , the contrbution of H-phase to to lacetate production rates w as only 7 .5% , m uch low er than thatat the neutralpH conditions (up to 31 .7% ) . Butunder neutralpH condition the daily acetate productivily ( 0 .99g / d) w as m uch low er than thatof the tw o controlm ethods (3 .67 g/d) in the w hole systan .
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