中温和高温下橄榄榨油废水厌氧消化的动力学研究

A kinetic study of anaerobic digestion of olive mill wastewater at mesophilic and thermophilic temperatures.

作者信息

Borja R, Martín A, Banks C J, Alonso V, Chica A

机构信息

Instituto de la Grasa y sus Derivados (C.S.I.C.), Avda. Padre García Tejero, 4, 41012-Sevilla, Spain.

出版信息

Environ Pollut. 1995;88(1):13-8. doi: 10.1016/0269-7491(95)91043-k.

DOI:10.1016/0269-7491(95)91043-k

PMID:15091564

Abstract

The kinetics of the anaerobic digestion of olive mill wastewater (OMW) was studied in the mesophilic and thermophilic ranges of temperature. Two completely mixed continuous flow bioreactors operating at 35 degrees C and 55 degrees C and with an average biomass concentration of 5.45 g VSS litre(-1) were used. The thermophilic reactor worked satisfactorily between hydraulic retention times (HRT) of 10 to 40 days, removing between 94.6 and 84.4% of the initial chemical oxygen demand (COD). In contrast, the mesophilic reactor showed a marked decrease in substrate utilization and methane production at a HRT of 10 days. TVFA levels and the TVFA/alkalinity ratio were higher and close to the suggested limits for digester failure. The yield coefficient for methane production (1 CH(4) STP g(-1) COD(added)) was 28% higher in the thermophilic process than in the mesophilic one. Macroenergetic parameters, calculated using Guiot's kinetic model, gave yield coefficients for the biomass (Y) of 0.18 (mesophilic) and 0.06 g VSS g(-1) COD (thermophilic) and specific rates of substrate uptake for cell maintenance (m) of 0.12 (mesophilic) and 0.27 g COD g(-1) VSS.day(-1) (thermophilic). The experimental results showed the rate of substrate uptake (R(s); g COD g(-1) VSS.day(-1)), correlated with the concentration of biodegradable substrate (S(b); g COD litre(-1)), through an equation of the Michaelis-Menten type for the two temperatures used.

摘要

在中温和高温温度范围内研究了橄榄果渣废水（OMW）厌氧消化的动力学。使用了两个完全混合的连续流生物反应器，分别在35℃和55℃下运行，平均生物量浓度为5.45 g VSS·L⁻¹。高温反应器在水力停留时间（HRT）为10至40天之间运行良好，去除了初始化学需氧量（COD）的94.6%至84.4%。相比之下，中温反应器在HRT为10天时，底物利用率和甲烷产量显著下降。挥发性脂肪酸（TVFA）水平和TVFA/碱度比更高，且接近消化器失效的建议限值。高温过程中甲烷产生的产率系数（1 CH₄ STP g⁻¹ COD（添加））比中温过程高28%。使用吉奥模型计算的宏观能量参数给出了生物量的产率系数（Y），中温为0.18，高温为0.06 g VSS g⁻¹ COD，以及细胞维持的底物摄取比速率（m），中温为0.12，高温为0.27 g COD g⁻¹ VSS·d⁻¹。实验结果表明，在所使用的两个温度下，底物摄取速率（R(s)；g COD g⁻¹ VSS·d⁻¹）通过米氏方程与可生物降解底物浓度（S(b)；g COD·L⁻¹）相关。