Modified steel slag for effect prolongation of calcium peroxide: A novel approach to enhancing SCFAs production from sludge anaerobic fermentation

摘要

In order to prolong the effect of CaO2 on improvement of short-chain fatty acids (SCFAs) production in sludge anaerobic fermentation, CaO2 particles were successfully loaded onto the porous surface of steel slag pre-modified with salicylic acid-methanol (SAM-SS). The prepared CaO2/SAM-SS was then characterized and in-vestigated for its effects on anaerobic fermentation. Experimental results revealed that, due to the slow release and reaction of CaO2/SAM-SS, SCFAs concentrations in CaO2/SAM-SS tests were significantly higher than in the control and SAM-SS tests, and high SCFAs concentration was sustained for a longer period than in the CaO2 tests. Since most bacterial indexes were reduced by CaO2/SAM-SS, more supply of "raw materials" from a better disintegration and hydrolysis, which was associated with the alkalinity and (OH)-O-center dot radicals released from the reaction of CaO2 with H2O, contribute to the higher SCFAs yields. This study provides a new approach towards a higher and longer SCFAs harvesting.