AMIT CHHILLAR, RAJESH DHANKHAR, SAVITA KALSHAN, PREETI VIJARNIA AND POONAM YADAV
Department of Environmental Science, Maharishi Dayanand University, Rohtak-124 001 (Haryana), India
*(e-mail : firstname.lastname@example.org; Mobile : 9868006114)
(Received : May 9, 2019; Accepted : August 14, 2019)
The present study involved, a lab-based model using aerobic treatment followed by immersed membrane was developed for the treatment of dairy wastewater. Performance evaluation was studied for chemical oxygen demand, total suspended solid, biological oxygen demand, alkalinity, pH and volatile fatty acids through membrane technology named as iMBR (Immersed Membrane Bio Reactor). The rheological characterization and retention time study of the dairy wastewater in bioreactor with different loading rates were also conducted. Removal efficiency of chemical oxygen demand gradually increased from 55.7 to 95.5% in respect to sludge retention time in the organic reactor. Removal efficiency of biological oxygen demand also increased from 75.7 to 98.6%. Membrane fouling startd gradually during continuous operation of organic wastewater. Frequency of membrane fouling rate could be controlled with regular recirculation
of wastewater and same was noticed and proved highly efficient throughout the rheological characterization study. Continuous aeration using fine bubble diffusers and timely backwashing results indicated high filtrate fluxes during treatment with less membrane fouling to avoid excessive chemical for de-fouling. Retention time of six and eight hours was found efficient for evaluating removal efficiency of dairy wastewater.
Key words : iMBR (immersed Membrane BioReactor), COD, BOD, TSS, pH