tailieunhanh - Effect of flux condition on pollutants removal of sponge membrane bioreactor treating hospital wastewater

This research aims to study on the treatment performance of two lab-scale submerged membrane bioreactors treating hospital wastewater. One was operated at low fluxes (2, 4, 6 LMH) and the other at higher fluxes (10, 15, 20 LMH). Polyester-urethane cube sponge media (20 % v/v) was added into both reactors for fouling control and simultaneous nitrification denitrification (SND). | Vietnam Journal of Science and Technology 55 (4C) (2017) 210-216 EFFECT OF FLUX CONDITION ON POLLUTANTS REMOVAL OF SPONGE MEMBRANE BIOREACTOR TREATING HOSPITAL WASTEWATER Dang Bao Trong1, Vo Thi Kim Quyen1, Tran Thanh Dai2 & Bui Xuan Thanh1,* 1 Faculty of Environment and Natural Resources, University of Technology, Vietnam National University - Ho Chi Minh, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City 2 Faculty of Food and Environment, Dong Nai Technology University, Nguyen Khuyen Street, Quarter 5, Trang Dai Ward, Bien Hoa City, Dong Nai Province * Email: bxthanh@ Received: 29 June 2017; Accepted for publication: 15 October 2017 ABSTRACT Nowadays, membrane bioreactor (MBR) is an advanced available technology for wastewater treatment due to technical innovations and cost reduction. Especially, the high biomass concentration and long sludge retention time are favourable for the biodegradation of organic pollutants and nitrification. This research aims to study on the treatment performance of two lab-scale submerged membrane bioreactors treating hospital wastewater. One was operated at low fluxes (2, 4, 6 LMH) and the other at higher fluxes (10, 15, 20 LMH). Polyester-urethane cube sponge media (20 % v/v) was added into both reactors for fouling control and simultaneous nitrification denitrification (SND). The results showed that organic removal efficiencies were improved with an increase in flux. The removal efficiencies of COD and total nitrogen were 8589 % and 26-42 % at low fluxes and 96-97 %, 53-65 % at higher fluxes, respectively. The treated water quality complied with Vietnam National Technical Regulation on health care wastewater, class A. Keywords: membrane bioreactor, sponge, flux; fouling, hospital wastewater. 1. INTRODUCTION There are about 750 health facilities, including central hospitals and private clinics in Ho Chi Minh City. Most of the hospitals do not have effective wastewater treatment system, so wastewater was discharged .