Microbial Desalination Cell Using Tempe Wastewater as Substrate with Phosphate Buffer Solution as Catholyte

Ginasesharita Hardiyanti, Rita Arbianti, Tania Surya Utami


In the next few years, Indonesia will experience a water crisis, because the needs for water continues to increase every year. The water crisis will affect the quality of life, especially in terms of sanitation and health, so it is necessary to find the solutions. Microbial Desalination Cell (MDC) is a good technology to desalinate salt water into fresh water because MDC at the same time can generating electricity. Tempe wastewater used as a substrate by using their source of microorganisms to efficiency the price of operations. To improve the performance of the MDC, the experiment focused on the use of phosphate buffer solution with varying concentrations of 0.025 M, 0.05 M, 0.1 M and 0.15 M in the anode and the cathode chamber. The use of buffer solutions to the MDC system will decrease the pH imbalance that occurs during experiment due to the formation of hydroxyl and proton from redox reactions in the anode and cathode chamber. The experiment shows that MDC using model tempe wastewater, with a concentration of 0.1 M phosphate buffer solution in anode and cathode chamber is the optimum buffer phosphate concentration with salt removal 9.87 % and average power density 1734.08 mW/m2.

Keywords— desalination; microbial desalination cells; phosphate buffer solution; tempe wastewater

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