Biogas Production from Excess Sludge Oxidized with Peracetic Acid (PAA)

Abstract

Human functioning related to living and economic activity involves generating an increasing amount of sewage and sludge, which needs to be subjected to advanced processes of treatment, neutralization, and management. The deterioration in the susceptibility of excess sludge to biochemical decomposition observed under anaerobic conditions leads to the development and application of highly effective methods of wastewater treatment based on the removal of biogenic compounds using activated sludge, with a high degree of sludge thickening obtained in mechanical facilities. The concentration of volatile fatty acids, being an important intermediate product of anaerobic stabilization, directly determines biogas production efficiency. This study aimed to determine the effect of chemical disintegration with peracetic acid on biogas production efficiency using methane fermentation of pretreated sludge. Intensification of the hydrolysis phase is an important determinant of the efficiency of biochemical sludge decomposition under anaerobic conditions. The association of excess sludge oxidation, initiated by peracetic acid with biological hydrolysis, which is the first phase of methane fermentation, led to an increase in sludge digestion degree and biogas production efficiency. The compound of STERIDIAL W-10, which is an aqueous solution of 10% peracetic acid, 10% acetic acid, and 8% hydrogen peroxide, was used. The disintegration of excess sludge with a reactant dose of 3.0 mL of STERIDIAL W-10/L yielded a specific biogas production of 0.52 L/g VSS and a 74% degree of sludge digestion.

Wastewater Treatment and Biogas Production: Innovative Technologies, Research and Development Directions

“…Zawieja and Warw ąg [4] aimed to determine the effect of chemical disintegration with peracetic acid on biogas production efficiency using methane fermentation of pretreated sludge. The disintegration of excess sludge before methane fermentation plays an important role by supporting the biochemical decomposition of sludge under anaerobic conditions.…”

“…The disintegration of excess sludge before methane fermentation plays an important role by supporting the biochemical decomposition of sludge under anaerobic conditions. A novelty aspect of the research is the use of a highly effective method of oxidation of excess sludge with peracetic acid (PAA), taking into account the selection of the most favorable treatment conditions to increase the effectiveness of methane fermentation [4]. Sludge pre-treatment with peracetic acid (PAA) increased the soluble chemical oxygen demand and the correlated increase in the concentration of volatile fatty acids, as determined in the filtrate fluid of the pre-treated sludge.…”

“…During methane fermentation of sludge subjected to chemical disintegration with a reactant dose of 3.0 mL of STERIDIAL W-10/L, the highest value of daily biogas production (0.28 L) was observed on the tenth day of the process. The total biogas production was 3.53 L, which translated into a specific biogas production of 0.52 L/g VSS [4]. Kazimierowicz et al [5] also assessed the effect of pre-treatment on the effectiveness of sewage sludge digestion.…”

Pretreatment of Slaughterhouse Effluent Treatment Plant Sludge Using Electro-Fenton Process for Anaerobic Digestion

“…Pretreatment refers to the treatment of the sludge to increase the availability of the substrate components to microbial enzymes and, as a result, enhance the removal of organics, improve the reaction kinetics, and increase the total biogas generation [11]. The release of trapped organic compounds, an increase in surface area-to-volume ratio, and the hydrolysis of macromolecules, are some of the processes that are known to increase the availability of the substrate to microorganisms [12]. In particular, hydrolysis and β-oxidation are the two processes of utmost importance.…”

Analysis of Reject Water Formed in the Mechanical Dewatering Process of Digested Sludge Conditioned by Physical and Chemical Methods

“…This is a biological process of decomposing organic substances in sewage sludge that leads to its stabilization. As a result, hydrophilic, highly hydrated, highly viscous, sanitary hazardous sewage sludge is transformed into easily dehydrated, thin, earthy sludge [1][2][3][4][5].…”