Zhang, Y., Zhao, Q., Jiang, J., Wang, K., Wei, L., Ding, J., & Yu, H. (2017). Acceleration of organic removal and electricity generation from dewatered oily sludge in a bioelectrochemical system by rhamnolipid addition. Bioresource technology, 243, 820-827.
Conversion of biomass energy of dewatered oily sludge to electricity is the rate-limiting process in bioelectrochemical system (BES). In this study, 2 mg gâˆ’1rhamnolipids were added to dewatered oily sludge, resulting in a significant enhancement in maximum power density from 3.84 ± 0.37 to 8.63 ± 0.81 W mâˆ’3, together with an increase in total organic carbon (TOC) and total petroleum hydrocarbon (TPH) removal from 24.52 ± 4.30 to 36.15 ± 2.79 mg gâˆ’1 and 29.51 ± 3.30 to 39.80 ± 2.47 mg gâˆ’1, respectively. Rhamnolipids can also enhance the solubilization and promote the hydrolysis of dewatered oily sludge with increases in SOCD from 14.93 ± 2.44 to 18.40 ± 0.08 mg gâˆ’1 and VFAs from 1.02 ± 0.07 to 1.39 ± 0.12 mg gâˆ’1. Furthermore, bacteria related to substrate degradation were predominant in dewatered oily sludge, and bacteria related to the sulfate/sulfide cycle were significantly enriched by rhamnolipid addition.
I initially found this paper interesting because the overall process being looked at uses bioremediation of petroleum waste as a mechanism for generating electricity. This covers how the addition of Rhamnolipids improves the process’s effectiveness and how the active bacterial composition changes after its addition.