超高效厌氧生物反应器床层能量耗散率

为指导超高效厌氧生物反应器的功率匹配和操作优化,加速反应器工程化开发,通过向反应器床层分别投加1 500、2 500和3 500 mL厌氧颗粒污泥,采用质量分数为0.5%的稀硫酸溶液模拟进料,采用化学反应生成CO₂(饱和NaHCO₃+稀硫酸)模拟生物产气,研究了反应器床层处于固定态、流化态和输送态时的能量耗散特征,建立了床层处于固定态和流化态时的能量耗散模型.试验结果表明：所建模型的模拟值与实测值吻合较好,可用预测同类高效厌氧反应器床层能量耗散率；床层处于固定态、颗粒结团状态、液固两相流化态以及气液固三相流化态的最大能量耗散率分别为0.143、4.449、2.173和11.132 W/m³.其中,最大值11.132 W/m³是超高效厌氧反应器功率匹配的重要依据.

Bed energy dissipation rate of super-high-rate anaerobic bioreactor

In order to guide po wer matching and operation optimization of super high rate anaerobic bioreactor (SAB), and accelerate the engineering application of SAB, this work mainly concentrated on energy dissipation characteristics of SAB under the states of nonfludized bed, fluidizaed bed and transportation bed, respectively, which were investigated by using anaerobic granular sludge, simulation influent and gas production. The SAB was filled with 1.5 L, 2.5 L and 3.5 L anaerobic granular sludge, respectively, and was fed with sulfuric acid solution (0.5%, w/w). Gas was produced by chemical reaction between sulfuric acid and saturated sodium bicarbonate. Bed energy dissipation rate (Ø) models were established under the states of nonfludized bed and fluidized bed, respectively. The predictions from these models agree well with the experimental data and, therefore, they can be used to estimate Ø of SAB. The maximum Ø under the states of nonfludized bed, granular sludge agglomeration, liquid solid two-phase fluidizaed bed and gas-liquid-solid tree-phase fluidized bed are 0.143 W/m³, 4.449 W/m³, 2.173 W/m³ and 11.132 W/m³, respectively. Thereinto, the maximum Ø value of 11.132 W/m³ is one of the basic parameters for power matching.