3.1.3. Temperature shock
The temperature shock lasted for 12 days or 3 intermittent cycles and consisted in a one step raise of the operating temperature from (35 ± 1) °C to (55 ± 1) °C. The shock led to an increase in biogas production in both systems (results not shown). A similar effect was reported by Van Lier et al. [42]. However, the methane percentage in the biogas was lowered in both systems. This reduction was more severe in the continuous systems (67%–52%), as compared to the intermittent systems (75%–67%). It would be expected that a raise in the operational temperature might improve the overall performance and biogas production of both systems, since thermophile reactors have been described as more effective in treating complex wastewaters compared to mesophile systems [23] and [39]. However, the performance of both systems decreased, considering all parameters monitored (Fig. 11, Fig. 10 and Fig. 9). The most severe effect was observed for the TSS washout, which may have been caused by disaggregation of biomass flocs due to high temperature [43] and due to the turbulence effects of the initial increase in biogas production.
3.1.3. Temperature shockThe temperature shock lasted for 12 days or 3 intermittent cycles and consisted in a one step raise of the operating temperature from (35 ± 1) °C to (55 ± 1) °C. The shock led to an increase in biogas production in both systems (results not shown). A similar effect was reported by Van Lier et al. [42]. However, the methane percentage in the biogas was lowered in both systems. This reduction was more severe in the continuous systems (67%–52%), as compared to the intermittent systems (75%–67%). It would be expected that a raise in the operational temperature might improve the overall performance and biogas production of both systems, since thermophile reactors have been described as more effective in treating complex wastewaters compared to mesophile systems [23] and [39]. However, the performance of both systems decreased, considering all parameters monitored (Fig. 11, Fig. 10 and Fig. 9). The most severe effect was observed for the TSS washout, which may have been caused by disaggregation of biomass flocs due to high temperature [43] and due to the turbulence effects of the initial increase in biogas production.
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