Simultaneous nitrification and denitrification process in a new Tubificidae-reactor for minimizing nutrient release during sludge reduction |
| |
| Authors: | Yu Tian Yaobin Lu |
| |
| Affiliation: | 1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150090, China;2. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;1. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;2. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;1. Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan 316022, China;2. Zhoushan Agro-forestry, Fishery and Rural Areas Committee of Zhejiang, Zhoushan 316021, China;1. School of Resources and Environment, University of Jinan, Jinan 250022, PR China;2. Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China |
| |
| Abstract: | Nutrient release is reported as one of the main disadvantage of sludge reduction induced by aquatic worm. In this study, a Static Sequencing Batch Worm Reactor (SSBWR) was proposed with novel structure of perforated panels, combined aeration system and cycle operation. Effective simultaneous nitrification and denitrification were obtained owing to the stratified sludge layer containing aerobic and anoxic microzone formed on each carrier during most of the operation time in the SSBWR, which created suitable conditions for remarkable sludge reduction and nutrient removal. The results showed that the total nitrogen (TN) concentration, NO3?–N + NO2?–N concentration and NH4+–N release could be reduced by 67.5%, 98.5% and 63.0%, respectively. And the soluble chemical oxygen demand (sCOD) released by sludge predation was also proved to provide a carbon source for denitrification leading to carbon release control and substantial cost savings. A schematic diagram of the stratified sludge layer and the mass balance of the nitrification–denitrification cycle were given, providing further insight into the nutrient (sCOD and nitrogen compounds) transformation during the worm predation in the SSBWR. For the mixed sludge liquid of 3000 mg TSS/L, 30 mg/L sCOD and 40 mg/L NO3?–N, the NO3?–N and NO2?–N came close to zero, and the sludge concentration, NH4+–N release and sCOD release was reduced by 33.6%, 63.0% and 72.5%, respectively, during 48 h’ predation. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
