Integrated anaerobic and aerobic treatment of sewage

作者：Ke Wang · 年份：1994 · DOI：10.18174/206286 · 被引用次数：76 · 研究领域：Wastewater Treatment and Nitrogen Removal

This thesis describes results of investigations dealing with sequential concept of anaerobic-aerobic treatment of municipal wastewater. The main purposes of the study were 1) to develop a proper anaerobic hydrolytic pretreatment unit, consisting of a Hydrolysis Upflow Sludge Bed (HUSB-) reactor and 2) to combine this system with proper aerobic post treatment processes, such as the activated sludge process or a stabilization pond system and with a combined anaerobic-aerobic process consisting of the Expanded Granular Sludge Bed (EGSB-) reactor and an upflow micro- aerophilic post-treatment process for complete sewage treatment.The newly develop HUSB reactor serves for removing SS and accomplishing a certain sludge stabilization and raising the biodegradability of the remaining COD. The HUSB-system is operated at the similar retention time as the primary sedimentation tank, viz. HRT=2.5-3.0 hours. These features of the new system result in 1) release of the troublesome high SSaccumulation problems in the post treatment, such as stabilization ponds and UASB or EGSB systems, 2) a shorter overall retention time and lower energy requirements in the different types of aerobic post treatment processes, 3) an improved applicability for some refractory industrial wastewater treatment and 4) and certain extent of sludge stabilization in the HUSB reactor itself at higher temperature conditions or in a complementary sludge recuperation tank operated in parallel with the HUSB-reactor at lo...