《Water Research》杂志刊登“热预处理对剩余活性污泥的影响以及预处理模型发展的研究”

作  者：Gillian Burger, Wayne Parker

刊  物：《Water Research》，2013年，47卷第14期，5245-5256页

关键词：剩余活性污泥；预处理；高压热水解；好氧消化；建模

摘  要：本研究调查高压热水解（HPTH）预处理对化学需氧量（COD）在剩余活性污泥（WAS）中分布的影响。研究的第一阶段，把来自一个合成供给生物反应器（BR）的WAS送入有氧沼气池（AD）中。第二阶段，把取自BR的WAS采用150°C、3兆帕的HPTH预处理30分钟后送入AD中。两阶段中对每个进程中物理、化学和生物学特性进行一系列测定。BR WAS的COD包括存储产品（X_STO）、活性异养菌（X_H）和内源性衰变产物（X_E）。预处理并没有增加BR WAS好氧消化的程度，因此可得出结论：像XE一样不可生物降解的COD并没有因预处理改变。然而，预处理确实增加了降解率，它把36%的X_H转化为易于生物降解的COD（S_B），其余的XH转化为缓慢生物降解的COD（X_B）。同时，预处理中X_STO完全转化为S_B。尽管预处理没有改变好氧消化下游VSS的浓度，但是却减少了46±11%的ISS的浓度。该工艺减少了21±8%的由消化产生固体总质量。开发和校准了一个基于COD的HPTH预处理的模型。该模型纳入BioWin 3.1^®后，可对本研究中整个系统的稳定性能和动态呼吸测量结果进行准确模拟。

Investigation of the impacts of thermal pretreatment on waste activated sludge and development of a pretreatment model

Authors: Gillian Burger, Wayne Parker

Journal: Water Research, Volume 47, Number 14 (2013), 5245-5256

Key words: Waste activated sludge; Pretreatment; High-pressure thermal hydrolysis; Aerobic digestion; Modeling

Abstract: This study investigated the impacts of high pressure thermal hydrolysis (HPTH) pretreatment on the distribution of chemical oxygen demand (COD) species in waste activated sludge (WAS). In the first phase of the project, WAS from a synthetically-fed biological reactor (BR) was fed to an aerobic digester (AD). In the second phase, WAS from the BR was pretreated by HPTH at 150 °C and 3 bars for 30 min prior to being fed to the AD. A range of physical, biochemical and biological properties were regularly measured in each process stream in both phases. The COD of the BR WAS consisted of storage products (X_STO), active heterotrophs (X_H) and endogenous decay products (X_E). Pretreatment did not increase the extent to which the BR WAS was aerobically digested and hence it was concluded that the unbiodegradable COD fraction, i.e. X_E, was unchanged by pretreatment. However, pretreatment did increase the rate of degradation as it converted 36% of X_H to readily biodegradable COD (S_B) and the remaining X_H to slowly biodegradable COD (X_B). Furthermore, X_STO was fully converted to S_B by pretreatment. Although pretreatment did not change the VSS concentration in the downstream aerobic digester, it did decrease the ISS concentration by 46 ± 11%. This reduced the total mass of solids produced by the digester by 21 ± 8%. A COD-based HPTH pretreatment model was developed and calibrated. When this model was integrated into BioWin 3.1^®, it was able to accurately simulate both the steady state performance of the overall system employed in this study as well as dynamic respirometry results.

原文链接：http://www.sciencedirect.com/science/article/pii/S004313541300496X