HTL Wastewater Treatment

Student thesis: Profession bachelor

  • Aisha Aden Ahmed
Hydrothermal liquefaction is a conversion technology that produces biocrude from biomass, which is a large source of environmentally-friendly energy resources. However, the disadvantage of this promising technology lies in the effluent from the process, which contains a high concentration of organic compounds. This wastewater needs to be cleaned to a certain degree before a municipal wastewater treatment plant can receive it. This project sought to investigate the process of HTL, especially the wastewater component of the biocrude production. A flocculation experiment was carried out with a few batches of HTL wastewater made from aspen tree, with the intent of reducing the amount of chemical oxygen demand (COD) as much as possible. The experiment was carried out using three levels of flocculation amounts as well as two organic flocculants, poly(EDMA) (PV), in order to investigate the individual and combined effect of the flocculants on the reduction of COD. With the use of statistical tools such as t-test and ANOVA, it appears that there is no significant effect of flocculation on the reduction of COD. Despite this, the optimal dosage of flocculants which was found to remove 29.57% COD, was 0.02 ml of PV 22 and 25 on 10 ml wastewater with an initial COD of 5.14 g/L. This dosage were chosen for a cost analysis of an industrial scale wastewater cleaning step. The economic feasibility of organic flocculation was estimated and found to be about four times as expensive as sending untreated wastewater to a plant.
Publication date15 Aug 2020
Number of pages45
ID: 338779980