Performance Comparison of EGSB and IC Reactors for Treating High-Salt Fatty Acid Organic Production Wastewater

Abstract

This study used the EGSB and IC reactors to treat the high-salt and high-concentration organic wastewater (high-salt fatty acid production wastewater) and compared their performances The experimental results showed that the optimal influent water quality thresholds for both bioreactors to treat this wastewater were a COD concentration of 18,000 mg/L and a sulfate ion concentration of about 8000 mg/L. The reactor operated well when C/S was greater than 2.8. In addition, the value of C/S should not be less than 1.5. This is due to that under this condition, the sulfate reduction process has a significant impact on the removal of COD, and MPB may be inhibited by sulfides. The organic load OLR should not be greater than 10 kgCOD/(m3·d). It was also found that the start-up time of the IC reactor with external circulation was slightly shorter, and the COD removal effect, gas production rate, and load tolerance were slightly better than those of the EGSB reactor, the best reflux ratio of the two reactors was 6:1. The appropriate rising flow rate was 0.4 m/h.

Performance and Energy Utilization Efficiency of an Expanded Granular Sludge Bed Reactor in the Treatment of Cassava Alcohol Wastewater

“…These favorable conditions enabled it to effectively treat fresh leachate at an exceptionally high OLR of up Energies 2023, 16, 7496 2 of 15 to 37.94 g COD/L•d and achieve a remarkable COD degradation rate exceeding 80% [4]. Additionally, high-concentration wastewater (such as cheese whey wastewater [5], high-salt fatty acid organic production wastewater [6], corn starch processing wastewater [7], and soft drink industry wastewater [8]) could function normally even under OLRs exceeding 7 gCOD/L•d, and the COD removal rate reached more than 80% (details provided in Table 1). Therefore, the EGSB reactor can be an efficient and sustainable alternative for wastewater treatment compared to other conventional methods.…”