Effects of Fenton Pre‐Treatment on Waste Activated Sludge Properties

Abstract

Research Article Effects of Fenton Pre-Treatment on Waste Activated Sludge PropertiesFenton process was investigated for the purpose of biological sludge disintegration. The Box-Wilson experimental design was employed to evaluate the effects of major process variables (Fe(II) and H 2 O 2 concentrations) on both disintegration and dewatering performance of sludge. Results showed that 4 g Fe(II)/kg total solids (TSs) and 60 g H 2 O 2 /kg TS are efficient for floc disintegration. Fenton pre-treatment enhanced the biodegradability of sludge. For 4 g Fe(II)/kg TS and 60 g H 2 O 2 /kg TS, 19.4% higher methane production was achieved compared to raw sludge in biochemical methane potential assay. Fenton pre-treatment resulted in the release of organic sludge components into the liquid phase. For 4 g Fe(II)/kg TS and 60 g H 2 O 2 /kg TS, dissolved organic carbon and total nitrogen in sludge's supernatant increased by 75.74 and 60.60%, respectively. Fenton pre-treatment enhanced the filterability of sludge and it can be applied for conditioning purpose before mechanical dewatering units.

Fenton pre-treatment of secondary sludge to enhance anaerobic digestion: Energy balance and greenhouse gas emissions

“…Thus, Fenton pre-treatment enhanced methane production by 15% compared to the raw sludge digestion. These results are in line with those reported by Erden and Filibeli [10], where 19.4% higher methane production was obtained compared to raw sludge. The increase in the SCOD increases the methane production [10].…”

“…These results are in line with those reported by Erden and Filibeli [10], where 19.4% higher methane production was obtained compared to raw sludge. The increase in the SCOD increases the methane production [10]. Erden and Filibeli [9] concluded that the specific methane production increased during the first 20 days of digestion in the digester containing Fenton pre-treated sludge.…”

“…Fenton pre-treatment (FPT) increases biogas (methane and carbon dioxide) production [8,17,9] and [10], However, it is presently not clear whether the energy recovered from the produced methane will be equivalent to the energy input required for the pre-treatment process and AD. Thus the aim of the present study was to evaluate the effectiveness of Fenton pre-treatment of secondary sludge for enhancing the AD efficiency by computing energy balance and corresponding GHG emissions.…”

Studies on the Chemical Stabilisation of Digestate from Mechanically Recovered Organic Fraction of Municipal Solid Waste

“…into ferrous species (Fe 2? ) at the nZVI surface can occur when compared to the homogeneous oxidation [36]. Figure 2 illustrates the results obtained in terms of C-CO 2 released as a function of the mass of nZVI added, and it is possible to observe that the quantity of oxidized carbon is doubled when about 75 g of nZVI per kg TS -1 was added.…”

“…Globally, hydrogen peroxide catalysed by the iron catalyst leads to the production of hydroxyl radicals that are able to destroy the complex organic structures of the flocks. The soluble low molecular weight by-products may reach the liquid and be further oxidized in that phase [36]. The percentage of oxidized organic carbon was determined by two different methods based on TOC in the treated solid (Method 1) and in VS (Method 2).…”