Application of grey system theory on the influencing parameters of aerobic granulation in SBR. Issue 17 (2nd September 2017)

• Record Type: Journal Article
• Authors: Bindhu, B. K.; Madhu, G.
• Is Part Of: Environmental technology. Volume 38:Issue 17(2017)
• Page Start: 2143
• Page End: 2152
• Publication Date: 2017-09-02
• Subjects: Grey system theory -- aerobic granulation -- sequencing batch reactor -- grey relational coefficient -- organic loading rate -- volume exchange ratio; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2016.1246617
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: Aerobic granulation is a promising technology for wastewater treatment. Four operational parameters were selected as influencing factors for this study. Aerobic granulation was experimented with three different values of organic loading rate (3, 6 and 9 kg COD m −3 d −1 ), superficial upflow air velocity (SUAV) (2, 3 and 4 cm s −1 ), settling time (3, 5 and 10 min) and volume exchange ratio (25%, 50% and 75%) in sequencing batch reactor in nine trials for the optimal performance of aerobic granulation. The influence of compared parameters on five reference parameters (sludge volume index (SVI), time taken for the appearance of granules, size and specific gravity of granules and chemical oxygen demand (COD) removal) was analyzed using grey system theory. The grey relational coefficients and grey entropy relational grade of each parameter were calculated. Hydrodynamic shear force in terms of SUAV was found to have the greatest influence on granule appearance, specific gravity of granules and COD removal efficiency. SVI is greatly affected by settling time. The optimal scopes of all the compared parameters were found.