Fractional, biodegradable and spectral characteristics of ...
2012-9-15 · Five widely used EPS extraction protocols using formaldehyde–NaOH, CER, ultrasonication, heat and NH 4 OH were adopted () brief, two protocols were on the use of chemicals: (1) NH 4 OH: sludge samples were first centrifuged (4000 × g) for 30 min, then 100 g of the sediment collected was slowly mixed with 200 mL of 25% (v/v) NH 4 OH for 24 h at 4 °C and then filtered with 0.45 μm ...