以城市污水处理厂初沉污泥、混合污泥及脱水污泥为对象,研究不同含固率污泥经热水解后的厌氧消化特性及其有机物转化规律。结果表明,热水解后高含固污泥的中温厌氧消化甲烷产率最高(291.8 m L/g VS),其次为热水解后常规初沉污泥高温厌...以城市污水处理厂初沉污泥、混合污泥及脱水污泥为对象,研究不同含固率污泥经热水解后的厌氧消化特性及其有机物转化规律。结果表明,热水解后高含固污泥的中温厌氧消化甲烷产率最高(291.8 m L/g VS),其次为热水解后常规初沉污泥高温厌氧消化(272.3 m L/g VS)。各工艺条件下未经热水解预处理的污泥厌氧消化水解率(32%~37%)均低于热水解后的水解率(52%~56%),有机物水解仍是未经预处理高含固污泥厌氧消化过程的限速步骤,是厌氧消化工艺改进的主要目标。水解污泥中有机物可快速、高效降解,热水解预处理可有效加速后续甲烷化进程。经综合考虑,高含固污泥经过热水解预处理后的中温厌氧消化性能最优,可作为城市污水处理厂污泥处理的首选工艺。展开更多
Anaerobic acidogenic fermentation with high-solid sludge is a promising method for volatile fatty acid（VFA） production to realize resource recovery. In this study, to model inhibition by free ammonia in high-solid s...Anaerobic acidogenic fermentation with high-solid sludge is a promising method for volatile fatty acid（VFA） production to realize resource recovery. In this study, to model inhibition by free ammonia in high-solid sludge fermentation, the anaerobic digestion model No. 1（ADM1） was modified to simulate the VFA generation in batch, semicontinuous and full scale sludge. The ADM1 was operated on the platform AQUASIM 2.0.Three kinds of inhibition forms, e.g., simple inhibition, Monod and non-inhibition forms,were integrated into the ADM1 and tested with the real experimental data for batch and semi-continuous fermentation, respectively. The improved particle swarm optimization technique was used for kinetic parameter estimation using the software MATLAB 7.0. In the modified ADM1, the Ksof acetate is 0.025, the km,acis 12.51, and the KI_NH3is 0.02,respectively. The results showed that the simple inhibition model could simulate the VFA generation accurately while the Monod model was the better inhibition kinetics form in semi-continuous fermentation at pH 10.0. Finally, the modified ADM1 could successfully describe the VFA generation and ammonia accumulation in a 30 m^3full-scale sludge fermentation reactor, indicating that the developed model can be applicable in high-solid sludge anaerobic fermentation.展开更多
以高固污泥为研究对象,探究额微曝气预处理对污泥厌氧消化产甲烷的影响。实验结果表明微曝气预处理能够强化高固污泥厌氧产甲烷,并且最佳的微曝气强度为0.4 vvm,相应的甲烷产量为312 m L/g挥发性悬浮固体。此外,微曝气有助于溶解性有机...以高固污泥为研究对象,探究额微曝气预处理对污泥厌氧消化产甲烷的影响。实验结果表明微曝气预处理能够强化高固污泥厌氧产甲烷,并且最佳的微曝气强度为0.4 vvm,相应的甲烷产量为312 m L/g挥发性悬浮固体。此外,微曝气有助于溶解性有机物的释放,当曝气强度为0.4 vvm时,溶解性COD与总COD的比值为0.31,溶解性蛋白质和多糖的含量分别为2.5、1.2 g/L,进一步研究发现微曝气能够促进挥发性脂肪酸(VFA)的积累和VSS的减量。微生物种群研究表明微好氧曝气能够促进Firmicutes的相对丰度,并且在0.4 vvm曝气强度作用下,Firmicutes的相对丰度为40.6%。展开更多
为探究椰壳颗粒活性炭活化过硫酸钠(PS)预处理对高固污泥厌氧发酵水解产酸性能的影响,通过调节挥发性脂肪酸(VFAs)产量、溶解性化学需氧量(SCOD)、溶解性蛋白质及多糖等指标,探究了不同剂量颗粒活性炭(GAC)与PS预处理对高固污泥产酸发...为探究椰壳颗粒活性炭活化过硫酸钠(PS)预处理对高固污泥厌氧发酵水解产酸性能的影响,通过调节挥发性脂肪酸(VFAs)产量、溶解性化学需氧量(SCOD)、溶解性蛋白质及多糖等指标,探究了不同剂量颗粒活性炭(GAC)与PS预处理对高固污泥产酸发酵的最佳条件。结果表明,当PS和GAC投加量分别为1.50 mmol·g^(-1)(以总固体计)和0.65 g g^(-1)(以总固体计)时,在发酵前期产酸速率相比于对照组提高了341.43%,后续发酵过程中,VFAs最大产量相比于对照组提高了28.43%。其中,乙酸作为优质碳源,其质量浓度增加了48.98%;继续增加GAC剂量时,反应器厌氧发酵性能下降,其原因可能是过量GAC会消耗已生成的SO_(4)^(-)·,降低污泥水解作用,同时GAC表面对VFAs的吸附也导致产酸量下降。三维荧光分析表明,在产酸量较高的反应器中,氨基酸、芳香族蛋白质等溶解性有机物的质量浓度较低,这说明适量椰壳颗粒活性炭活化PS预处理方式可提高高固厌氧发酵中微生物对于水解底物的利用率,从而提高污泥的厌氧产酸性能。本研究结果可为炭活化PS预处理技术在高固污泥厌氧消化中的应用提供参考。展开更多
文摘以城市污水处理厂初沉污泥、混合污泥及脱水污泥为对象,研究不同含固率污泥经热水解后的厌氧消化特性及其有机物转化规律。结果表明,热水解后高含固污泥的中温厌氧消化甲烷产率最高(291.8 m L/g VS),其次为热水解后常规初沉污泥高温厌氧消化(272.3 m L/g VS)。各工艺条件下未经热水解预处理的污泥厌氧消化水解率(32%~37%)均低于热水解后的水解率(52%~56%),有机物水解仍是未经预处理高含固污泥厌氧消化过程的限速步骤,是厌氧消化工艺改进的主要目标。水解污泥中有机物可快速、高效降解,热水解预处理可有效加速后续甲烷化进程。经综合考虑,高含固污泥经过热水解预处理后的中温厌氧消化性能最优,可作为城市污水处理厂污泥处理的首选工艺。
基金supported by the Joint Innovative R&D Program of University and Industry(No.BY2014023-03)National Key Technology R&D Program of the Ministry of Scienceand Technology(No.2014BAD24B03-02)
文摘Anaerobic acidogenic fermentation with high-solid sludge is a promising method for volatile fatty acid（VFA） production to realize resource recovery. In this study, to model inhibition by free ammonia in high-solid sludge fermentation, the anaerobic digestion model No. 1（ADM1） was modified to simulate the VFA generation in batch, semicontinuous and full scale sludge. The ADM1 was operated on the platform AQUASIM 2.0.Three kinds of inhibition forms, e.g., simple inhibition, Monod and non-inhibition forms,were integrated into the ADM1 and tested with the real experimental data for batch and semi-continuous fermentation, respectively. The improved particle swarm optimization technique was used for kinetic parameter estimation using the software MATLAB 7.0. In the modified ADM1, the Ksof acetate is 0.025, the km,acis 12.51, and the KI_NH3is 0.02,respectively. The results showed that the simple inhibition model could simulate the VFA generation accurately while the Monod model was the better inhibition kinetics form in semi-continuous fermentation at pH 10.0. Finally, the modified ADM1 could successfully describe the VFA generation and ammonia accumulation in a 30 m^3full-scale sludge fermentation reactor, indicating that the developed model can be applicable in high-solid sludge anaerobic fermentation.
文摘为探究椰壳颗粒活性炭活化过硫酸钠(PS)预处理对高固污泥厌氧发酵水解产酸性能的影响,通过调节挥发性脂肪酸(VFAs)产量、溶解性化学需氧量(SCOD)、溶解性蛋白质及多糖等指标,探究了不同剂量颗粒活性炭(GAC)与PS预处理对高固污泥产酸发酵的最佳条件。结果表明,当PS和GAC投加量分别为1.50 mmol·g^(-1)(以总固体计)和0.65 g g^(-1)(以总固体计)时,在发酵前期产酸速率相比于对照组提高了341.43%,后续发酵过程中,VFAs最大产量相比于对照组提高了28.43%。其中,乙酸作为优质碳源,其质量浓度增加了48.98%;继续增加GAC剂量时,反应器厌氧发酵性能下降,其原因可能是过量GAC会消耗已生成的SO_(4)^(-)·,降低污泥水解作用,同时GAC表面对VFAs的吸附也导致产酸量下降。三维荧光分析表明,在产酸量较高的反应器中,氨基酸、芳香族蛋白质等溶解性有机物的质量浓度较低,这说明适量椰壳颗粒活性炭活化PS预处理方式可提高高固厌氧发酵中微生物对于水解底物的利用率,从而提高污泥的厌氧产酸性能。本研究结果可为炭活化PS预处理技术在高固污泥厌氧消化中的应用提供参考。
