Effect of confectionery wastewater pretreatment in a vortex layer apparatus on the biohydrogen production through continuous dark fermentation

The biological hydrogen production from confectionary wastewater (CWW) was evaluated in a continuous mode in up-flow anaerobic biofilters. Wastewater was pretreated in the vortex layer apparatus (VLA) for 1 and 3 minutes at a power of VLA of 14 kW. HRT in biofilters was gradually decreased from 5.6 to 1.8 and 1.3 days, which corresponded to OLR 2.0; 6.3; 8.8 kg COD/(m³ day). Pretreatment in VLA led to a change in a number of physicochemical characteristics of CWW: a slight increase in soluble COD, an increase in the content of soluble sugars, acetic acid, and a decrease in the concentration of propionic, butyric, and caproic acids. It was shown that due to the abrasion of steel needles in the pretreated CWW, the concentration of iron increased. Despite the fact that the highest yield of hydrogen was observed for unpretreated CWW, the pretreatment in VLA contributed to a significant increase in the methane yield, possibly due to an increase in the iron content in the pretreated CWW. Thus, pretreatment in VLA can be a promising method for improving the process of obtaining biohythane from wastewater.

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