Bio-methanation Of Fine Sieved Fraction Sequestered From Raw Municipal Sewage

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Abstract

Fine sieves can be implemented as compact alternatives to primary clarification. Fine sieved fraction (FSF) is a heterogeneous substrate that mainly consists of fibers originating from toilet paper and thus contains a high cellulosic fraction. Resource recovery and energy neutral sewage treatment is nowadays focus of many water authorities. This novel concept led to a new focus on optimisation of digestion processes and enhanced biogas production. In this scope, the main objective of this research was to investigate the bio-methane potential and maximum methane production rates of FSF, sequestered from raw municipal sewage, for onsite energy recovery towards energy neutrality at wastewater treatment plants. Main published chapters of this thesis: o Digester performance and microbial community changes in thermophilic and mesophilic sequencing batch reactors fed with the fine sieved fraction of municipal sewage (Chapter 2,Water Research, 2015). o Microbial population dynamics during long term sludge adaptation of thermophilic and mesophilic sequencing batch digesters treating sewage fine sieved fraction at varying organic loading rates (Chapter 3, Biotechnology for Biofuels, 2015). o High-rate thermophilic bio-methanation of the fine sieved fraction from Dutch municipal raw sewage: Cost-effective potentials for on-site energy recovery (Chapter 4, Applied Energy, 2016). o Comparative analysis of digestibility of sewage fine sieved fraction and virgin and recycled hygiene paper (Chapter 5, Waste Management, 2016). o Impact of lignocellulosic-waste intermediates on hydrolysis and methanogenesis under thermophilic and mesophilic conditions (Chapter 6, Chemical Engineering Journal, 2016).