Treatment of paper mill deinking wastewater

This paper describes the results of laboratory experiments using a thermophilic aerobic MBR (TMBR) at 50 C°. An innovative use of submerged flat-sheet MBR modules to treat circuit wastewater from the paper industry was studied. Two experiments were conducted with a flux of 8–13 L/m2/h without chemical membrane cleaning. COD and BOD⁵ elimination rates were 83% and 99%, respectively. Calcium was reduced from 110 to 180 mg/L in the inflow to 35–60 mg/L in the permeate. However, only negligible membrane scaling occurred. The observed sludge yield was very low and amounted to 0.07– 0.29 g MLSS/g COD eliminated. Consequently, the nutrient supply of ammonia and phosphate can be lower compared to a mesophilic process. Molecular-biological FISH analysis revealed a likewise high diversity of microorganisms in the TMBR compared to the mesophilic sludge used for start-up. Furthermore, ammonia-oxidizing bacteria were detected at thermophilic operation.
 

Microbiological analysis performed with: VIT® gene probe technology

Publication language: English