Effect of Different Acid and Base Potassium Ferrate Pretreatment on Organic Acid Recovery by Anaerobic Digestion of Sludge

Mengjia Tian; Feng Liu; Jiawen Guo; Wei Li; Mao Zhang; Xiang Li

doi:10.3390/ijerph192215093

Effect of Different Acid and Base Potassium Ferrate Pretreatment on Organic Acid Recovery by Anaerobic Digestion of Sludge

Int J Environ Res Public Health. 2022 Nov 16;19(22):15093. doi: 10.3390/ijerph192215093.

Authors

Mengjia Tian¹, Feng Liu^{1

2}, Jiawen Guo¹, Wei Li¹, Mao Zhang¹, Xiang Li^{1

2

3}

Affiliations

¹ School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
² Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, China.
³ State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.

Abstract

Potassium ferrate has strong oxidation in both acid and alkali environments, which has attracted extensive attention. However, the impact of the pH environment on this coupling process with the goal of resource recovery has not received attention. Under the goal of the efficient recovery of organic acid, the changes of solid-liquid characteristics of sludge after acid and alkaline ferrate pretreatment and during anaerobic digestion were discussed. The results showed that compared with blank control groups, after alkaline ferrate pretreatment, the volatile suspended solids (VSSs) decreased the most, reaching 28.19%. After being pretreated with alkaline ferrate, the sludge showed the maximum VFA accumulation (408.21 COD/g VSS) on the third day of digestion, which was 1.34 times higher than that of the acid ferrate pretreatment. Especially in an alkaline environment, there is no need to add additional alkaline substances to adjust the pH value, and the effect of sludge reduction and acid production is the best.

Keywords: VFAs; anaerobic digestion; potassium ferrate; sludge reduction.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Acids
Anaerobiosis
Iron Compounds*
Organic Chemicals
Sewage* / chemistry

Substances

Sewage
potassium ferrate
ferrate ion
Iron Compounds
Acids
Organic Chemicals

Grants and funding

This research was funded by the Jiangsu Postgraduate Practice Innovation Plan, Suzhou University of Science and Technology, No. SJCX21-1406, and the Natural Science Foundation of China, No. 51938010.