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为进一步挖掘酿酒副产物黄水的资源化利用空间,构建不锈钢单室微生物电解池(MEC)处理黄水并实现能源回收.以4%的黄水为基质,考察不同外加电压(0.4V、0.6V、0.8V、1.0V)对黄水处理过程中化学需氧量(COD)去除、各有机酸降解、甲烷产生及能量平衡等的影响.结果表明,当外加0.8V电压时,MEC中COD去除率达到94.90%±0.70%,较对照组(AD)的82.00%±0.70%增加了12.90%±0.74%.同时,COD去除负荷达(5.27±0.51)kgm~(-3)d~(-1),是AD(3.45±0.09)kgm~(-3)d~(-1)的1.53倍.对反应中甲烷产生速率和有机酸组分变化分析表明,当外加0.6V电压时,MEC中的甲烷产生速率为(1818.54±145.77)mLL~(-1)d~(-1),比AD(1014.88±121.44)mLL~(-1)d~(-1)增加了78.19%;当外加电压为0.8V时,MEC中的乙醇去除速率为(102.37±14.65)mgL~(-1)h~(-1),是AD组(57.31±10.45)mgL~(-1)h~(-1)的1.79倍;AD组的最高丙酸浓度高达(1436.10±84.42)mg/L,而外加1.0V电压的MEC组,其最高丙酸浓度为(845.57±76.72)mg/L,较之降低了(590.53±7.73)mg/L.当反应周期结束时,AD中残留的乙酸和丙酸浓度分别是MEC(外加0.8V电压)中的93.57和5.31倍.最后,反应器能量平衡分析的结果表明,当外加电压为1.0V时,其能量产生与净能量产生分别达到了(3.93±0.48)kWhkg~(-1)、(3.80±0.48)kWhkg~(-1),较AD组(2.92±0.37)kWhkg~(-1)分别增加了(1.01±0.12)kWhkg~(-1)、(0.88±0.12)kWhkg~(-1),且MEC均获得了较AD组更多的净能量.综上表明该MEC可有效促进黄水处理效率并回收甲烷,其最佳外加电压为0.8V.
In order to further exploit the resource utilization space of brewery by-product yellow water, stainless steel single-chamber microbial electrolytic cell (MEC) was constructed to treat yellow water and recover energy.According to different applied voltage (0.4V, 0.6 V, 0.8V, 1.0V) on COD removal, organic acid degradation, methane production and energy balance during the treatment of yellow water.The results showed that COD The removal rate reached 94.90% ± 0.70%, which was increased by 12.90% ± 0.74% compared with 82.00% ± 0.70% of the control group (AD). Meanwhile, the COD removal load reached 5.27 ± 0.51 kgm -3 d ~ 1) was 1.53 times that of AD (3.45 ± 0.09) kgm -3 d -1 .The analysis of methane production rate and organic acid composition in the reaction showed that when 0.6V was applied, (1818.54 ± 145.77) mLL -1 d -1, which is 78.19% more than that of AD (1014.88 ± 121.44) mLL -1 d -1. When the applied voltage The ethanol removal rate of MEC was (102.37 ± 14.65) mgL -1 h -1 at 0.8V, which was 57.31 ± 10.45 mgL -1 h -1 in AD group, The highest propionic acid concentration in AD group was (1436.10 ± 84.42) mg / L, while the highest propionic acid concentration in MEC group was (84 5.57 ± 76.72) mg / L, which was (590.53 ± 7.73) mg / L. The concentrations of acetic acid and propionate remaining in AD were 93.57 and 5.31 respectively in MEC (plus 0.8V) when the reaction period was over Finally, the energy balance analysis of the reactor showed that the energy production and the net energy production reached 3.93 ± 0.48 kWh kg -1, 3.80 ± 0.48 kWh kg -1, (-1) increased (1.01 ± 0.12) kWhkg -1 and (0.88 ± 0.12) kWh kg -1 respectively compared with 2.92 ± 0.37 kWh kg -1 in AD group More net energy than the AD group.To sum up, the MEC can effectively promote the efficiency of yellow water treatment and methane recovery, the best applied voltage is 0.8V.