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Water Reuse for Industrial Wastewater
Expanded Title:This project investigated the application of the dual stage operations strategy in a pilot plant evaluation of a MBR (dsMBR) for the on-site treatment and recovery (reuse) of industrial trade effluent. The goal of the study was to use the MBR system as a pre-treatment for the reduction of the wastewater pollution load so that a downstream reverse osmosis (RO) system can be incorporated to facilitate a zero liquid discharge strategy as well as effluent reuse potential for the industrial partner. A textile manufacturer located in the Western Cape was chosen as one of the industrial partners for the on-site evaluation of the pilot plant. A 5-10m3/day MBR pilot plant incorporating sidestream Airlift™ membrane modules was designed and was operated on-site from March to December 2010. The design of the dsMBR process was geared towards optimal microbial community enrichment and was based on a pre-denitrification configuration coupled with enhanced biological phosphate removal (EBPR) (anaerobic-anoxic-aerobic with recycle loops). The anaerobic-anoxic-aerobic process was designed to incorporate two primary functionalities: influent azo dye cleavage in a reducing environment followed by oxidation of the resultant aromatic amines; and biological nutrient removal through enrichment of associated microbial consortia using nitrification, denitrification, and phosphate removal processes. To achieve this, the preliminary data analysis was used to identify critical scale-up criteria. In terms of overall results, COD removal fluctuated considerably during the 3-month start-up stage (~100 days), thereafter, an average of 90-95% removal was achieved under optimised conditions. When compared to the South African (SA) government discharge standard for COD (5000mg/L), the COD value for the treated textile effluent (20 mg/L) was well within this standard. A paper and pulp industry located in the Western Cape was also chosen as an industrial partner for the evaluation of a pilot-scale MBR plant for the treatment of paper mill effluent. A 45- 65 L/day MBR pilot plant incorporating ceramic membranes in an external modular configuration (similar to the sidestream Airlift™ membrane modules) was designed and was operated in a laboratory from June to December 2010. The design of the dual-stage membrane bioreactor was based on a pretreatment high rate anaerobic system (EGSB) coupled with a posttreatment denitrification/nitrifation configuration (anaerobic-anoxic-aerobic with recycle loops). The high rate anaerobic process was designed to reduce influent COD in an attempt to reduce the need for high volume dosing. The anoxic-aerobic processes were designed to incorporate two primary functionalities: further reduction of COD concentration; and biological nutrient removal through enrichment of associated microbial consortia using nitrification and denitrification processes. In terms of effluent COD reduction efficiency, the anaerobic pretreatment stage gave an average of 70% COD removal while the MLE-MBR stage increase the total COD removal to 97%.
Date Published:01/05/2013
Document Type:Research Report
Document Subjects:Wastewater Management - Industrial
Document Format:Report
Document File Type:pdf
Research Report Type:Technical
WRC Report No:TT 556/12
ISBN No:978-1-4312-0411-3
Authors:Edwards W; Sheldon MS; Zeelie PJ; De Jager D; Dekker LG; Bezuidenhout CC
Project No:K5/1900
Organizations:Atl-Hydro; Cape Peninsula University of Technology; Dekker Envirotech; North West University; Falke Eurosocks
Document Size:2 870 KB
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