Abstract
Worm predation is one of the promising techniques for sludge reduction with the advantage of high efficiency and eco-friendliness. In order to achieve high quality effluent and low sludge production simultaneously, worm reactor (WR) with an efficient wastewater treatment process (anaerobic-anoxic-oxic membrane bioreactor (A2O-MBR)) was coupled with an auxiliary phosphorus removal reactor (PRR) to establish an A2O-MBR-WR-PRR combined system. In A2O-MBR-WR-PRR, high quality effluent with 27.7±9.3mg/LCOD, 13.0±1.8mg/LTN and 0.4±0.2mg/L TP was obtained, and the sludge yield was reduced by 49.8% compared with the conventional A2O-MBR. Besides, the roles of WR on the A2O-MBR-WR-PRR system were deeply investigated. In comparison with conventional A2O-MBR, the removal capacities of TN and TP in the wastewater treatment process were increased by 11.6% and 100.8% respectively. Further analysis suggested that in A2O-MBR sludge activities were improved and the functional bacteria were enriched due to the recirculation of non-consumed sludge from WR. Moreover, analysis of sludge reduction mechanisms revealed that WR led to the highest sludge reduction efficiency (41.7%) in the A2O-MBR-WR-PRR combined system. Meanwhile, energy uncoupling (2.3%), microbial community changes and lysis-cryptic growth (5.8%) were identified in A2O-MBR, which contributed to further sludge reduction. This study provided an efficient approach for practical application of worm predation for sludge reduction and wastewater treatment.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.