Removal of antibiotic resistant microbes by Fe(II)-activated persulfate oxidation

Potential for colloid removal from petrochemical secondary effluent by coagulation–flocculation coupled with persulfate process

“…3 The sulfate radicals with strong oxidation capacity can even oxidize organic matter adsorbed to the particulate phase (>0.45 μm), making the high-MW colloids rise. 14,51 For the CF-PS process, the DOC of the organics in all the MW fractions decreased. Compared with the PS process, the DOC removal contributions of CF-PS in the >100 K, 50-100 K, 30-50 K, 10-30 K, and <3 K fractions increased by 77.6%, 81.0%, 37.8%, 22.1%, and 0.3%, while the DOC removal contribution in the 3-10 K fraction decreased by 66.3%.…”

“…The CF-PS process has more advantages for the degradation of high-MW colloids, mainly because of the combination of the selectivity of CF toward high-MW organics and the strong oxidation of PS. 14,26,50 If the organics in the wastewater are dominated by medium-MW and low-MW organics, the ideal degradation effect can be achieved by the PS-only process. The strong oxidation of SO 4 ˙− in the PSonly process can be considered effective for the mineralization of small molecules.…”

“…The increase in high-MW proteins is caused by the oxidation of undissolved proteins by SO 4 ˙−. 14,51 Compared with the PS-only process, the protein degradation contributions of CF-PS in the 30-50 K, 10-30 K, 3-10 K, and <3 K ranges increased by 27.9%, 10.6%, 25.1%, and 31.6%. The stabilization of proteins in the CF process contributes more to the destruction of the protein structure in the PS oxidation.…”

“…PS mainly relies on the sulfate radical (SO 4 ˙−, with a redox potential of 2.6-3.1 V) to oxidize organic matter; this radical is generated by heat, ultrasound, UV, microwave, or transition metal activation through S 2 O 8 2− . [8][9][10][11][12][13][14] Compared with the hydroxyl radical (˙OH, with a redox potential of 2.7-2.8 V), SO 4 ˙− possesses an equal or even higher redox potential. In addition, SO 4 ˙− is more selective and demonstrates a longer half-life than ˙OH, so it has a stronger oxidation capacity and can oxidize organic pollutants that ˙OH cannot oxidize.…”

Optimization of PNP Degradation by UV-Activated Granular Activated Carbon Supported Nano-Zero-Valent-Iron-Cobalt Activated Persulfate by Response Surface Method

“…Iron (Fe)-based catalysts have the advantages of low toxicity, a high geological storage capacity, and easy recovery. Commonly used Fe-based materials include nanoscale-zero-valent iron (nZVI), and ferrous oxides, Fe 3 O 4 and Fe 2 O 3 ; however, the catalytic performance of Fe 3 O 4 and Fe 2 O 3 is usually low [18][19][20].…”