New Application of Supercritical Water Gasification to Palm Oil Mill Effluent: Gasification and Phosphorus Recovery

Abstract

The simultaneous production of fuel gas and inorganic phosphorus from palm oil mill effluent (POME) in supercritical water was experimentally studied herein. A laboratory-scale continuous reactor was employed, and POME was treated in supercritical water at 500–600 °C under a pressure of 25 MPa, with a residence time of 5–50 s. The effects of temperature and residence time on the carbon yields, gas composition, and behavior of phosphorus during supercritical water gasification were examined. A reaction model was developed, and reaction rate constants for first-order kinetics were determined. The calculation was based on the model agreed well with the experimental results.

Continuous Hydrogen Production via Hydrothermal Gasification of Biodiesel Industry Wastewater: Experimental Optimization and Energy Integration Simulation

“…On the other hand, at lower temperatures, an increase in the feed flow rate showed a slight tendency to decrease the analyzed response. The greater influence of temperature than the feed flow rate in relation to hydrogen production was also observed in other works reported in the literature [30,35,36]. The effects described by the regression equation (Equation ( 1)) were plotted into a response surface graph for easier comprehension.…”

“…On the other hand, at lower temperatures, an increase in the feed flow rate showed a slight tendency to decrease the analyzed response. The greater influence of temperature than the feed flow rate in relation to hydrogen production was also observed in other works reported in the literature [30,35,36]. To evaluate how the hydrogen production relates to the amount of biomass processed, the ratio between the volume of H2 produced and the mass of carbon fed into the SCW reactor was calculated.…”

Reutilization of Algal Supercritical Water Gasification Waste for Microalgae Chlorella vulgaris Cultivation

“…Details of the reactor can be found elsewhere. 16 , 17 The feedstock was the microalgae C. vulgaris , the reaction temperatures were 400 and 600 °C, the reaction pressure was 25 MPa, and the residence time was 30 s. These temperatures are two typical temperatures employed for SCWG. For the reference purpose, the typical temperature for hydrothermal liquefaction is 350 °C and the critical temperature of water is 374 °C.…”

“…The SCWG effluent was obtained from an in-house reactor. Details of the reactor can be found elsewhere. , The feedstock was the microalgae C. vulgaris, the reaction temperatures were 400 and 600 °C, the reaction pressure was 25 MPa, and the residence time was 30 s. These temperatures are two typical temperatures employed for SCWG.…”