A new co-processing mode of organic anaerobic fermentation liquid and municipal solid waste incineration fly ash

A new co-processing mode of waste liquid from anaerobic fermentation of organic wastes and municipal solid waste incineration fly ash (MSWI-FA) dechlorination is reported in this paper. Taking acetic acid, the most common organic acid in anaerobic fermentation systems, as the representative of anaerobic fermentation organic acids, the improvement of the dechlorination effect and the mechanism of washing MSWI-FA with low concentrations of organic acid lotion were explored. The chlorine content of MSWI-FA was reduced to 0.82% after the optimal process washing pretreatment. Three anaerobic fermentation waste liquids (AFWLs) were used to verify that the chlorine content of MSWI-FA could be reduced to less than 1%, and the dechlorination effect of brewery wastewater, which reduced the chlorine content of MSWI-FA to 0.91%, was the best at this. The influence of the washing process on MSWI-FA pyrolysis was reflected in the whole process. The release of chloride decreased and the weight loss was mainly due to the release of CO2. The melting point of MSWI-FA, washed by the optimal process, was reduced by nearly 30 degrees C, and only 0.06% chlorine remained after calcination at 1100 degrees C, which was extremely beneficial in reducing the release of trace elements in MSWI-FA during heat treatment, and for the preparation of cement raw meal.

Automated summary

This study explores the dechlorination effect and mechanism of washing incineration fly ash with low concentrations of organic acid lotion, and finds that the chlorine content of the fly ash can be reduced to a lower level. The washing process has an impact on the pyrolysis of the fly ash, reducing the release of chlorides and benefiting the preparation of cement raw meal.