Comparison of the treatment for isopropyl alcohol wastewater from silicon solar cell industry using SBR and SBBR

Abstract

In the present study, isopropyl alcohol containing wastewater generated from silicon solar cell manufacture was sequentially treated with sequencing batch biofilm reactor and sequencing batch reactor. Sequencing batch biofilm reactor could remove 90 % of isopropyl alcohol from wastewater efficiently as the chemical oxygen demand lower than 1,200 mg L -1 . However, 1,600 mg L -1 of chemical oxygen demand damaged the biofilm. The operation mode was changed to sequencing batch reactor on day 30, and sequencing batch reactor showed a greater ability to remove isopropyl alcohol. When the influent chemical oxygen demand was 1,600 mg L -1 , the reactors achieved stable removal efficiencies of [95 % for chemical oxygen demand, and the effluent chemical oxygen demand was lower than 100 mg L -1 . Denaturing gradient gel electrophoresis analysis showed an increase in bacteria diversity as the operation mode was switched from sequencing batch biofilm reactor to sequencing batch reactor, which might increase the stability of flocs in sequencing batch reactor. Though 13 bands were sequenced from the denaturing gradient gel electrophoresis and a phylogenetic analysis was conducted based on these sequences, it is difficult to analyze the function of these predominant strains in the reactors. Two models were constructed for interpreting the structure of biofilm in sequencing batch biofilm reactor and flocs in sequencing batch reactor, respectively. Higher efficient transfer rate of dissolved oxygen in flocs was proposed as the main reason for the higher isopropyl alcohol removal ability in sequencing batch reactor.

Hydrogen from electrochemical reforming of C1–C3 alcohols using proton conducting membranes

“…According to literature [76,79], in contrast to primary alcohols, the adsorption of iso-propanol on Pt is non-dissociative. During cell operation, formation of acetone from iso-propanol takes place according to reaction (12); water does not participate in this reaction [80]:…”

“…Finally, the process has potential for several applications, taking into account that short-chain alcohols are present in industrial wastewater, e.g. from Fischer-Tropsch synthesis [11] or the silicon solar cell manufacturing industry (particularly iso-propanol) [12].…”

A comprehensive review on application of bioreactor for industrial wastewater treatment

“…While, SBR also shows a higher capability to eliminate isopropyl alcohol when the operation mode has been changed on day 30. The reactors attained stable elimination efficiency upon the affluent chemical oxygen demand was 1,600 mg per litter of 95% for COD (Xiao et al 2015). Yakamercan and Aygün (2020) there is a decline in the percent COD and color elimination.…”

A Mini Review of the Techno-environmental Sustainability of Biological Processes for the Treatment of High Organic Content Industrial Wastewater Streams

“…Following the reviewer's comment, we included the following extra examples in section 2 of the revised manuscript: "Similarly, Rajab et al [81] achieved an average total COD removal of 97±2% in a lab-scale integrated anaerobic/aerobic SBR treating poultry slaughterhouse wastewater. COD removal higher than 95% was obtained by Xiao et al [82] for the treatment of wastewater generated from silicon solar cell manufacture containing isopropyl alcohol operating a lab-scale achieve SBR. Anaerobic treatment is another process that has been widely used for industrial influents treatment [5]."…”