Method for rapidly starting dye-organic wastewater anaerobic co-metabolic system based on s-nzvi

A method for rapidly starting a dye-organic wastewater anaerobic co-metabolic system based on S-nZVI, comprising the following steps:

• S1, preparation of S-nZVI
• in an inert atmosphere, dissolving sodium dithionite and 0.1-0.15 mol/L ferrous sulfate heptahydrate in ultrapure water in a molar ratio of S:Fe=(0.1-0.5):1, stirring and evenly mixing to obtain a mixed solution, dropwise adding 0.4-0.5 mol/L potassium borohydride into the mixed solution at an addition rate of 8-12 mL/min by using a peristaltic pump for 18-22 min, removing supernatant followed by centrifuging and washing the obtained product with ultrapure water and ethanol in sequence, and subsequently performing vacuum drying on the washed product to obtain sulfur-doped nano iron particles marked as S-nZVI;
• and
• S2, anaerobic treatment of S-nZVI optimized dye-organic wastewater
• adding anaerobically digested sludge into a serum bottle and allowing the concentration of the anaerobically digested sludge to 4-6 gTS/L, then adding the S-nZVI obtained step S1 into the anaerobically digested sludge in an addition amount of 0.4-0.6 g/L, introducing 120-180 mL of dye-organic wastewater into the sludge, adjusting the pH of the sludge to 6.8-7.2 by using a pH adjuster, and then putting the sludge subjected to nitrogen stripping for 25-35 min onto a shaker for 10-14 h of anaerobic biological treatment;
• wherein, in step S2, the dye-organic wastewater comprises the following components:
• 200 mg/L methyl orange (MO), 2000 mg/L glucose, 25 mg/L KH2PO4, 100 mg/L NH4Cl, 20 mg/L MgCl2, 30 mg/L CaCl2, 5 mg/LEDTA, 2 mg/L FeSO4·7H2O, 1 mg/L ZnSO4·7H2O, 3 mg/L MnCl2·4H2O, 30 mg/L H3BO4, 20 mg/L CoCl2·6H2O, 1 mg/L CuCl2·2H2O, 2 mg/L NiCl2·6H2O and 3 mg/L Na2MoO4·2H2O.