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(a) Effects of different substrates on the MFC performance (substrate concentration: 100 mg/L as BOD5; LRT: 4 h; GRT: 6 min); (b) Relationship between BOD5 concentration and voltage output of the MFC biosensor (substrate concentration: 5–235 mg/L as BOD5; LRT: 4 h; GRT: 6 min).
