Previous chapters within the Climate Friendly Farming (CFF) anaerobic digestion (AD) section have focused on the development of new auxiliary technologies that work in conjunction with the core digester. These technologies allow for the production of numerous co-products that enhance project economics and improve sustainability. In addition to these important technology developments, there is a...

The Weyerhaeuser Digester Problem (WDP) is a simpli ed digester model which captures the major dynamic characteristics of a continuous pulp digester and has been o ered to the research community as an industrial challenge problem. The control objective is to minimize variations in the Kappa # for unmeasured disturbances. A systematic approach to selecting the manipulated inputs and secondary me...

The paper gives some background information on the production of biogas using agricul(ural Waste. Studies on biogas production with water hyacinth conducted in NIFFR using the floating type biogas digester complete with gas holder and an experimental metal digester with a measuring cylinder as gas collector are highlighted. A proposal for the construction of a dome — type biogas digester at Rof...

The start up &#10 dynamics of a one-million and two-hundred-thousand liter anaerobic digester of municipal waste treatment sludge was studied. In the digester, mixing was accomplished by circulation of the produced biogas at a rate of 0.13 m3 per hour of the digester volume per hour. During the nine-month study, no serious phenomena of foaming, getting sour, temperature fall, etc. were observe...

The start up dynamics of a one-million and two-hundred-thousand liter anaerobic digester of municipal waste treatment sludge was studied. In the digester, mixing was accomplished by circulation of the produced biogas at a rate of 0.13 m3 per hour of the digester volume per hour. During the nine-month study, no serious phenomena of foaming, getting sour, temperature fall, etc. were observed ...

A novel co-digestion approach was evaluated to determine if agricultural and industrial waste residues could efficiently degrade straw without pretreatment. Untreated rice straw was co-digested with pig wastewater and anaerobic sludge from the pulp and paper mill treatment process in a pilot-scale digester (1 m) operated in dry, mesophilic conditions. The total weight ratio of dry straw to pig ...

The anaerobic treatment of low strength domestic sewage at low temperature is an attractive and important topic at present. The upflow anaerobic sludge bed (UASB)-digester system is one of the anaerobic systems to challenge low temperature and concentrations. The effect of sludge recirculation rate on a UASB-digester system treating domestic sewage at 15 °C was studied in this research. A sludg...

Mixing patterns inside a simulated flat bottom digester were imaged using the non-invasive techniques of computer automated radioactive particle tracking (CARPT) and computed tomography (CT). Mixing/agitation was provided using gas (air) recirculation at three different flow rates (Q(g)) of 28.32, 56.64 and 84.96 l/h, corresponding to superficial gas velocities of 0.025, 0.05 and 0.075 cm/s, re...

Source segregated food waste was collected from domestic properties and its composition determined together with the average weight produced per household, which was 2.91 kg per week. The waste was fed over a trial period lasting 58 weeks to an identical pair of 1.5 m(3) anaerobic digesters, one at a mesophilic (36.5 degrees C) and the other at a thermophilic temperature (56 degrees C). The dig...

In this study, five different experiments were conducted over a period of 170 days to produce biogas by using a variety of mixtures of organic materials and landfill leachate. The aim of this study is to develop a more robust two-stage biogas plant that can accept a wide spectrum of waste products and continue to function without any malfunction. The facility has 5m3 total digester volume, with...