ASBR处理高浓度悬浮固体废物的工艺特性

在水力停留时间(HRT)分别为20、10、7.5、5d的条件下,进行了中温、高温厌氧序批式反应器(ASBR)处理热水解污泥的试验,在此基础上总结了ASBR处理高浓度悬浮固体废物的工艺特性.ASBR可以有效积累悬浮固体从而保持较高的固体浓度,但ASBR存在一“临界点”,即最大积累悬浮固体的能力,超过此临界点,反应器运行不稳.在稳态运行条件下,ASBR能保持较高固体停留时间(SRT)和微生物平均细胞停留时间(MCRT),在处理热水解污泥时,SRT和MCRT分别是水力停留时间(HRT)的2.53～3.73倍、2.03～3.14倍.因此,与传统的连续流搅拌反应器(CSTR)相比,ASBR的处理效率提高7.13%～34.68%.

Characteristics of Anaerobic Sequencing Batch Reactor for the Treatment of High-Solids-Content Waste

Based on the experiments of digestion of thermo-hydrolyzed sewage sludge in both mesophilic and thermophilic anaerobic sequencing batch reactors (ASBRs) with 20, 10, 7.5, 5d hydraulic retention time (HRT), operating characteristics of ASBR for treatment of high-solids-content waste were investigated. ASBR can efficiently accumulates suspended solids and keep high concentration solids, however there exists a "critical point" of ASBR, which means the maximum capability to accumulate suspended solids without negative effects on ASBR stability, and beyond which the performance deteriorates. Under steady condition, ASBR can sustains high solid retention time (SRT) and mean cell retention time (MCRT), the SRT and MCRT is 2.53 approximately 3.73 and 2.03 approximately 3.14 times of hydraulic retention time (HRT) when treating thermo-hydrolyzed sludge, respectively. Therefore, compared to traditional continuous-flow stirred tank reactor (CSTR), the efficiency of ASBR enhances about 7.13% approximately 34.68%.