Effect of temperature and pH on the kinetics of methane production, organic nitrogen and phosphorus removal in the batch anaerobic digestion process of cattle manure

被引:78
作者
Sánchez, E
Borja, R
Weiland, P
Travieso, L
Martín, A
机构
[1] CSIC, Inst Grasa, E-41012 Seville, Spain
[2] Consultores Ambientales CONAM, La Habana, Cuba
[3] Fed Res Ctr Agr, FAL, Inst Technol, D-38116 Braunschweig, Germany
[4] Ctr Nacl Invest Cient, DECA, La Habana, Cuba
[5] Univ Cordoba, Fac Ciencias, Dept Ingn Quim, E-14004 Cordoba, Spain
关键词
D O I
10.1007/s004490050727
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
A study of the effect of temperature and pH on the kinetics of methane production and organic nitrogen and phosphorus degradation in the anaerobic digestion process of cattle manure was carried out. Two laboratory-scale batch completely mixed reactors, operating at 35 degrees C (mesophilic temperature), and other two, operating at 60 degrees C (thermophilic temperature) were used. For each temperature selected, the influent pH values were 7.6 (initial pH of the waste used) and 7.0. The apparent kinetic constants of the biomethanization process increased 2.3 times when the initial pH of the influent was increased from 7.0 to 7.6 at mesophilic temperature. The values found at thermophilic temperature were similar. The kinetic constants of methane production decreased 2.6 and 7.2 times when the operating temperature increased from 35 degrees C to 60 degrees C for the experiments carried out at initial pH of 7.0 and 7.6, respectively. The methane yield coefficient (1 CH4 STP/g VS removed) also decreased when the temperature increased from 35 degrees C to 60 degrees C for the two initial pH values studied. This behaviour agreed with the major inhibition level observed at thermophilic temperature as a result of the higher organic nitrogen removal and ammonia nitrogen production observed at 60 degrees C. Specifically, the specific rate constants for organic nitrogen removal and ammonia nitrogen production increased 3.6 and 12 times when the temperature was increased from 35 degrees C to 60 degrees C for the experiments carried out at initial pH values of 7.0 and 7.6, respectively. In the same way, the values of the kinetic constant for phosphorus removal were 44% and 80% higher than those obtained at 35 OC for the two initial pH values above-mentioned, respectively. Finally, the experimental values of organic nitrogen and phosphorus concentrations were reproduced with deviations equal to or less than 10% and 15% in every case, respectively.
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页码:247 / 252
页数:6
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