AI Article Synopsis
- - This study explores using cation-exchange resin regeneration waste liquid (CRWL) as a NaCl source to enhance anaerobic fermentation in waste activated sludge (WAS) disposal and carbon recovery.
- - Through a 4-day fermentation process, a significant release of dissolved organic matters (DOMs) was achieved, primarily composed of acetic and butyric acids, leading to effective sludge disintegration.
- - The chemical conditioning of the fermented sludge showed remarkable improvements, reducing capillary suction time and moisture content, showcasing the potential benefits of a "treating waste by waste" approach for environmental and economic sustainability.
Article Abstract
This study reported the NaCl-enhanced anaerobic fermentation with cation-exchange resin regeneration waste liquid (CRWL) as alternative NaCl source for waste activated sludge (WAS) disposal and carbon recovery. Through 4-day CRWL-enhanced anaerobic fermentation at Na concentration of 0.34 mol/L, the Na-caused sludge disintegration triggered numerous release of dissolved organic matters (DOMs), i.e. 371.6 mg/g VSS, with composition distribution: acetic acid (28.2%) > butyric acid (16.1%) ≈ valeric acid (17.8%) ≈ proteins (16.4%) > propionic acid (14.4%) > unknown (3.2%) > carbohydrates (3.9%). Satisfying chemical conditioning performance for the fermented sludge was observed at the FeCl dosage of 0.3 g/g DS, attributing to the roles of double-layer compression and electric neutralization. The capillary suction time (CST) and sludge cake moisture content were decreased to 60.3 s and 75.1%, against those of 607 s and 93.5% before conditioning, respectively. Such "treating waste by waste" strategy could provide numerous environmental and economic benefits.
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| http://dx.doi.org/10.1016/j.biortech.2020.123659 | DOI Listing |
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