Brancheemner
As the economy and culture seek to expand energy alternatives and achieve a higher energy efficiency, the notion of renewable fuels has captured the public imagination. Among the renewable options like wind, solar and hydro-electricity is biogas. For decades, managing organic waste has served as a bane to farmers and home owners alike. Whether the source is livestock manure, dead flora, unused food and scraps, or animal carcasses, few will deny that strong odors emit from them. These are, in fact, gases and they are potent sources of energy generation. The key is in how to capture and utilize these emissions. Gazpack's product portfolio includes both continuous type and batch type biogas plants. Each type comes with its unique advantages, with continuous biogas plants offering uninterrupted gas production and batch type plants allowing flexibility in feedstock usage.
When organic substances ferment where air is absent, as inside a compost pile, biogas is produced by the disintegration of micro-organisms. This is primarily composed of methane and carbon dioxide. Methane (CH4) is a volatile gas already in use for stoves, ovens and some lighting fixtures. Carbon dioxide (CO2), meanwhile, is not only present in the combustion of organic compounds, it also exists in the air from which it gets absorbed by plants and vegetation. To be usable on a large scale, this mixture must be processed in a biogas plant.
The biogas plant has to eat: food scraps like eggshells and coffee grounds; potato peels and carrot stems; rendered fat and sludge can all serve as substrate upon which the chemical fermentation begins. Grass and leaf clippings as well as animal dung are also common inputs for a biogas plant. These are channeled into a fermenter — a light-less, oxygen-free chamber that is heated to about 104 degrees Fahrenheit. The micro-organisms then break down the substrate, facilitating the release of biogas. The resulting biogas released at this stage contains not just CO2 and CH4, but also toxic hydrogen sulphide (HS). For this reason, the fermenting unit must be made of a durable substance — stainless steel, e.g. — that can withstand its corrosive impact. The ash from the remainder substrate is removed to a storage tank from which it can be retrieved as a highly nutritious fertilizer.
Biogas facilities the world over vary in size. The largest can produce over 1,000,000 tons of organic material. They can generate close to 1,000,000 megawatt-hours of electricity annually. Still, a biogas factory will be only as large as the need and demand require. Equally important is the availability of biomass to use as substrate material. Any biogas treatment plant design must account for the transportation and replenishment of biomass as well. So, while there are several imposing biogas power plants in the world — from Colorado to Mexico, Denmark to Israel — smaller facilities abound, creating energy and serving the goal of environmental stewardship.
For an operation that powers major sectors like public transit or heats thousands of residential dwellings, biogas plant installation companies begin with a conception of the project, scoping out its potential and confirming its feasibility. What is the purpose of the plant? Is there a continuous source of biomass? Where should the facility be placed? Once a design plan is finalized, a location must be secured and legal permissions issued. Only then can construction begin. Biogas plant price varies, of course, according to the dimensions of the project and the biomass used.
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