Abstract
In this work, the main results about the investigations into the pyrolysis and the gasification ofsewage sludge of the Thermo-chemical Processes Group are being presented, Pyrolysis hasbeen carried out in three different experimental systems: two kinds of fixed bed reactors and afluidized bed reactor, In these experiments, the influence of the operational conditions onproduct distribution and on some characteristics of these products has been studied, Pyrolysisof sewage sludge in fluidized bed has been studied in order to maximize liquid fuel productyield and optimize its composition. In fixed bed pyrolysis experiments, the influence ofpyrolysis conditions on the production of a solid product (char) and its adsorbent propertieshave been studied. Gasification of sewage sludge has been studied in fluidized bed with theaim of finding the operational conditions that maximize the production of gas and minimizethe presence of tar in this gas.
Highlights
Sewage sludge is the solid waste left over when the wastewater treatment plants have done their work
As pyrolysis heating rate could play an important role in pyrolysis products characteristics, two different fixed bed pyrolysis plants were developed in order to achieve low or high heating rates of the samples, Pyrolysis of sewage sludge at low heating rates can be performed in the fixed bed reaction system shown in Figure 2, The reactor consists of a vertical cylindrical refractory steel tube placed into an electrical furnace
An inner steel cylinder can be moved vertically from the low temperature zone to the high one, so flash pyrolysis of sewage sludge is achieved, In this system, heating rate can be as high as 200e°C/min and is not a controllable parameter, unlike in the slow pyrolysis plant A temperature controller is used to reach the desired final pyrolysis temperature, and nitrogen is used as inert gas, flowing downwards the reactor with a flow rate set by a mass flow controller, Sample temperature can be measured by means of four type K thermocouples placed inside the basket
Summary
Sewage sludge is the solid waste left over when the wastewater treatment plants have done their work This waste consists of a complex heterogeneous mixture of organic and inorganic materials [I), Depending on its origin, it can contain heavy metals, pathogens and other substances that can be dangerous for the environment and for the human health. In the Thenno-chemical Processes Group (GPT) of the University of Zaragoza, the energetic and environmental optimization of pyrolysis and gasification has been investigated in laboratory scale plants. In this sense, the group has worked in finding out the operational conditions that optimize the energy obtained in these processes, In this work, data about product distribution and energetic profitability will be presented, for each one of these processes
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