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Advanced treatment of liquid swine manure using physico-chemical treatment
- Chelme-Ayala, Pamela, El-Din, Mohamed Gamal, Smith, Richard, Code, Kenneth R., Leonard, Jerry
- Journal of hazardous materials 2011 v.186 no.2-3 pp. 1632-1638
- ammonia, carbon, chlorides, coagulation, coliform bacteria, flocculation, iodine, ions, leaching, nitrates, nitrites, oxidants, oxidation, pH, phosphates, pig manure, polymers, sludge, total suspended solids
- In this study, liquid swine manure was treated by physico-chemical treatment, including coagulation, flocculation, and sedimentation followed by an oxidation step as a polishing treatment at a bench-scale level. A superabsorbent polymer (SAP) and a mineral and salt formulation able to generate molecular iodine were used as coagulant and oxidant agents, respectively. The results indicated that SAP at a concentration of 1.25g/L was able to reduce 32% of the initial total suspended solids (TSS) in experiments using supernatant at its natural pH. Following the SAP application, 82% of initial ammonia (NH₃), 78% of initial total organic carbon (TOC), and 93% of the total coliforms were reduced using 40mg/L of free iodine. In experiments performed with diluted supernatant (five-fold dilution), it was found that SAP at a concentration of 0.5g/L was capable of reducing 80% of the initial TSS in experiments at pH 11. A leaching study was conducted to assess the safety of sludge disposal. From the leaching tests using non-diluted supernatant, it was found that 24% of the chloride (Cl⁻) and 50% of the phosphate (PO₄ ³⁻) ions retained in the sludge leached to the ultrapure water after 48h. Potential contamination due to leaching of NH₃, nitrite (NO₂ ⁻) and nitrate (NO₃ ⁻) was found to be statistically insignificant.