AI Article Synopsis
- The study focused on enhancing the breakdown of paper mill sludge using a two-phase process that emphasizes the removal of extracellular polymeric substances (EPS) to improve disintegration efficiency.
- Key parameters like carbohydrates, proteins, DNA, soluble chemical oxygen demand (SCOD), and suspended solids (SS) were analyzed to evaluate the effectiveness of the deflocculation and disintegration processes.
- Results showed that deflocculating sludge increased biomethane production and significantly lowered management costs, highlighting the benefits of using thermal calcium peroxide in the disintegration process.
Article Abstract
The present study aimed to improve the hydrolysis potential of paper mill sludge through a two-phase disintegration process. In Particular, attention was focused on removal of extracellular polymeric substance (EPS) i.e. deflocculation of sludge in order to improve the efficiency of subsequent disperser disintegration. During deflocculation, carbohydrate, protein and deoxyribonucleic acids (DNA) were used as assessment parameters. During disintegration, soluble chemical oxygen demand (SCOD) and suspended solids (SS) reduction were used as assessment index to evaluate the efficiency of disintegration. A greater EPS removal was attained while deflocculating the sludge at calcium peroxide dosage of 0.05 g/g suspended solids (SS) and at a temperature of 70 °C. When comparing the disintegrated samples, a clear variation was noted in deflocculated and disintegrated sludge (19.2%) than the disintegrated sludge alone (13.5%). This clearly shows the need for deflocculation prior to disintegration. Likewise, a higher biomethane production of 0.214 L/g COD was achieved in deflocculated and disintegrated sludge than the pretreated sludge alone. Deflocculation reduces sludge management cost from 170 USD (Disperser alone (D alone disintegration)) to 51 USD (Thermal calcium peroxide mediated-Disperser (TCaO-D disintegration), indicating the efficiency of the proposed disintegration.
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| http://dx.doi.org/10.1016/j.envres.2023.116635 | DOI Listing |
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