Abstract

The objective of this research was to evaluate the effect of thermal hydrolysis pre-treatment on the solubilization of primary sludge (PS) and thickened waste activated sludge (TWAS) through the semi-continuous fermentation process under the mesophilic conditions. For this measure, the inoculum (anaerobic digestate), Primary Sludge (PS) and Thickened waste activated Sludge (TWAS) was subjected to the pre-treatment condition. The pre-treatment temperature ranged from 20°C to170°C. Then both raw and pre-treated sample was introduced the semi-continuous reactors for the fermentation process. The degree of solubilization was achieved 18% for raw (unpretreated sample) and 38% for the pre-treated sample. Moreover, the volatile suspended solids (VSS) reduction rate for the raw and pre-treated sample was 24% and 50% respectively. Additionally, the soluble COD production yield for the raw and pre-treated sample was obtained 247 mg COD/g VSS and 544 mg COD/g VSS correspondingly. Keywords: Fermentation process, Anaerobic digestion, Thermal hydrolysis pretreatment.

Highlights

  • Each year approximately 150 billion kilograms of industrial and domestic waste is generated in the United States

  • Substrate In this research, the inoculum, Primary Sludge (PS) and Thickened waste activated Sludge (TWAS), was taken from the effluent of anaerobic digester located in Ashbridge Bay municipal wastewater treatment plant as the main sewage facility of Toronto which has the working capacity of 818,000 m3/d

  • The findings of this research revealed that the degree of the solubilization of the inoculum was improved from 18% to 38% when the sample was subjected to pre-treatment and fermentation rather than being only fermented

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Summary

Introduction

Each year approximately 150 billion kilograms of industrial and domestic waste is generated in the United States. Among these amounts of waste, it is estimated that almost 100 billion kilograms are biodegradable (Edward A Bayer, 2007). The majority of Municipal solids waste (MSW) which is deposited in the landfills and subjected to anaerobic processes includes primarily of cellulose in a variety of forms such as newspaper, wood, and cardboard (Edward A Bayer, 2007). Series of biological process in which organic materials are braked down into biogas (mainly methane and carbon dioxide) and the combination of solid and liquid effluents (digestate), by various cultures of microorganisms in the absence of oxygen, is defined as anaerobic digestion (AD).

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