دانلود رایگان مقاله کاهش اثر مهار گازهای اسیدی در گاز دودکش با بافر ترونا

Abstract

In this study, trona buffer was used to mitigate the previously reported inhibition effect of CO2, SO2, NO, and HCl gases in combustion flue gases for the growth of Nannochloris sp. Culture medium with trona buffer after absorbing CO2(g) contains high dissolved inorganic carbon (DIC) concentration that can help maximize the growth and alleviate the inhibition effect as long as the pH of the medium is controlled at an optimum pH (pH ∼7–8) window for the growth of Nannochloris sp. A supply of high purity CO2(g) did not inhibit the growth. The acid gaseous constituents including SO2, NO, and HCl gases did not significantly reduce the growth as compared to the results previously reported. This study suggests that trona buffer can be effectively used for microalgae cultivation as biological CO2 remediation when it is considered being integrated into a coal-fired power plant after wet flue gas desulfurization system.

4. Conclusions

This study demonstrates a mitigation capability of trona buffer against a possible inhibition effect of acid gaseous constituents in combustion flue gas on the growth of Nannochloris sp. Trona buffer could keep the DIC concentration high after CO2(g) absorption at benign pH, and could alleviate the inhibition effect of the acid gases including SO2, NO and HCl in simulated flue gas. Pure CO2(g) did not adversely impact on the growth of Nannochloris sp. using trona buffer as long as the pH of the media was controlled within its benign window. The sustained photosynthetic efficiency also supports that the use of trona buffer could successfully help grow Nannochloris sp. using flue gas consisting of the acid gaseous constituents.