Microwave-assisted chemical oxidation of biological waste sludge: simultaneous micropollutant degradation and sludge solubilization.
Microwave-assisted hydrogen peroxide (MW/H2O2) treatment and microwave-assisted persulfate (MW/S2O8(2-)) treatment of biological waste sludge were compared in terms of simultaneous antibiotic degradation and sludge solubilization. A 2(3) full factorial design was utilized to evaluate the influences of temperature, oxidant dose, and holding time on the efficiency of these processes. Although both MW/H2O2 and MW/S2O8(2-) yielded ≥97% antibiotic degradation with 1.2g H2O2 and 0.87 g S2O8(2-) per gram total solids, respectively, at 160 °C in 15 min, MW/S2O8(2-) was found to be more promising for efficient sludge treatment at a lower temperature and a lower oxidant dosage, as it allows more effective activation of persulfate to produce the SO4(-) radical. Relative to MW/H2O2, MW/S2O8(2-) gives 48% more overall metal solubilization, twofold higher improvement in dewaterability, and the oxidation of solubilized ammonia to nitrate in a shorter treatment period.
Bogazici University, Institute of Environmental Sciences, Bebek, 34342 Istanbul, Turkey. Electronic address: nalan.bilgin@boun.edu.tr.
Nalan
N
Bilgin Oncu
Bogazici University, Institute of Environmental Sciences, Bebek, 34342 Istanbul, Turkey. Electronic address: balciogl@boun.edu.tr.
Isil
I
Akmehmet Balcioglu
D000641:Ammonia / Q000737:chemistry; D000900:Anti-Bacterial Agents / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry; D008872:Microwaves; D009566:Nitrates / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D012722:Sewage; D012995:Solubility; D013431:Sulfates / Q000737:chemistry; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*
D000900:Anti-Bacterial Agents; D008670:Metals; D009566:Nitrates; D016877:Oxidants; D012722:Sewage; D013431:Sulfates; D000641:Ammonia; D006861:Hydrogen Peroxide; D010100:Oxygen
Advanced oxidation processes; Antibacterial micropollutants; Biological waste sludge; Microwave; Sludge treatment