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http://dx.doi.org/10.17137/korrae.2022.30.3.23

Improvement of Sewage Sludge Dewaterability using Fe(II)/Na2S2O8  

Han, Jun-Hyuk (School of Civil & Environmental Engineering, Hankyong National University)
Nam, Se-Yong (School of Civil & Environmental Engineering, Hankyong National University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.30, no.3, 2022 , pp. 23-28 More about this Journal
Abstract
In order to investigate the degree of sewage sludge dewaterability using Fe(II)/Na2S2O8, STTF, SCST, water content, TS, VS, TB-EPS as carbohydrate and Protein were measured. The dosage of Na2S2O8 was varied from 0.4 to 0.7 mmol/gVS and molar ratio of Fe(II)/Na2S2O8 was varied from 0.5 to 0.7 mol/mol. According to the increase of the dosage of Na2S2O8 and Fe(II)/Na2S2O8 molar ratio, STTF and SCST increased from 1.00 to 15.00 and 4.51, respectively. Water content decreased to 82.6%. TB-EPS as carbohydrate and protein decreasing rate also increased to 37.16% and 57.34%, respectively. Especially, Na2S2O8 0.6 mmol/gVS and Fe(II)/Na2S2O8 0.6 mol/mol condition, water content dercreased to 83.1%, STTF and SCST increased to 13.64 and 4.19 which showed the cost effective improvement of dewaterability. It is considered that SO4- radical generated by Fe(II)/Na2S2O8 degraded EPS and converted bound water to free water.
Keywords
Fe(II); Sodium persulfate; Sewage sludge; Extracellular polymeric substances;
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