碱度类型及浓度对剩余污泥中温厌氧消化的影响

为了探究不同碱度物质（Na₂CO₃、KHCO₃、NaHCO₃）和浓度范围（2000，3000，4000mg/L）（以CaCO₃计）对中温厌氧消化系统的影响，采用了密封的半连续搅拌反应器进行批次试验.综合反应器运行与微生物高通量测序分析，结果表明在3种不同碱度类型中Na₂CO₃能推进水解酸化过程，而在产气减量方面NaHCO₃表现更为突出，说明在调节系统碱度时，Na₂CO₃更易促进水解酸化这一限速阶段，而NaHCO₃能使水解酸化细菌与产甲烷菌之间保持平衡，保证甲烷产量；在不同NaHCO₃浓度情况下，增加投加碱度的浓度使水解能力增强，相应会导致脱水性能恶化，而系统中挥发性脂肪酸含量变化不大，过量碱度将使得系统产气和减量能力下降.

Effects of alkalinity type and concentration on mesophilic anaerobic digestion of excess sludge

To explore the effects of different alkalinity substances (Na₂CO₃, KHCO₃, NaHCO₃) and concentration ranges (2000, 3000, 4000mg/L (as CaCO₃)) on the middle-temperature anaerobic digestion system, a static batch semi-continuous stirred tank was used in the experiment. The comprehensive reactor operation and microbial high-throughput sequencing analysis showed that Na₂CO₃ could promote the hydrolysis and acidification process in three different types of alkalinity, while NaHCO₃ was more prominent in gas production and reduction. It indicated that Na₂CO₃ was more likely to promote hydrolysis and acidification in the limiting stage compared to other samples, when the alkalinity of the system was adjusted. Under different concentrations, the hydrolysis capacity was enhanced by increasing the concentration of added basicity, which led to the deterioration of the dehydration performance, while the Volatile Fatty Acids changed little, and the excess basicity will reduce the gas production and reduction of the system.