Biogas from Food Wastes

Food waste holds one of the highest biogas potential among different organic substrates as it contains high amount of carbon and can be efficiently converted into biogas and organic fertilizer. Food waste can either be utilized as a single substrate in a biogas plant, or can be co-digested with organic wastes like cow manure, poultry […]

Applications of Biogas

The most common method for utilization of biogas in developing countries is for cooking and lighting. Conventional gas burners and gas lamps can easily be adjusted to biogas by changing the air to gas ratio. Burning biogas in a boiler is an established and reliable technology. Low demands are set on the biogas quality for this […]

Biogas from Industrial Wastes

Organic waste includes a wide range of organic materials obtained from domestic, industrial and commercial operation. Most of the organic waste generated in developing countries is dumped into the landfills where it is not only responsible for large-scale greenhouse gas emissions, but also becomes a health hazard and creates all sorts of pollution. Source of Organic Wastes […]

Hydrogen Sulphide Removal from Biogas

Hydrogen sulphide, a major contaminant in biogas, is both poisonous and corrosive, and causes significant damage to piping, equipment and instrumentation. The concentration of various components of biogas has an impact on its ultimate end use. While boilers can withstand concentrations of H2S up to 1000 ppm, and relatively low pressures, internal combustion engines operate best when […]

Biogas Enrichment using PSA Technique

Pressure swing adsorption, also known as carbon molecular sieves, is one of most popular biogas upgrading techniques. A typical PSA system is composed of four vessels in series that are filled with adsorbent media which is capable of removing water vapor, CO2, N2 and O2 from the biogas stream. During operation, each adsorber operates in an alternating […]

Working of Modern Biogas Plants

An anaerobic digestion plant is a decentralized energy system, which can lead to self-sufficiency in heat and power needs, and at the same time reduces environmental pollution. The components of a modern anaerobic digestion plant include: manure collection system, anaerobic digester, effluent treatment plant, gas holder, and electricity generating equipment. The fresh organic waste is stored […]

Management of Organic Industrial Wastes

Organic industrial wastes includes a wide range of organic materials obtained from industrial and commercial operation. These organic wastes, either liquid or solid, are a good substrate for biogas generation by making use of the anaerobic digestion process. Anaerobic digestion of organic industrial waste is fast gaining popularity worldwide. Sources of Organic Industrial Wastes Many […]

Benefits of Anaerobic Digestion

Anaerobic digestion is the natural biological process which stabilizes organic waste in the absence of air and transforms it into biofertilizer and biogas. It is a reliable technology for the treatment of wet, organic waste.  Organic waste from various sources is biochemically degraded in highly controlled, oxygen-free conditions circumstances resulting in the production of biogas […]

Biological Desulphurization of Biogas

Biogas basically consists of methane and carbon dioxide. In addition, it also contains unwanted contaminants, especially hydrogen sulfide (H2S). Hydrogen sulfide mainly occurs because of the degradation of sulfur-containing proteins (e.g. methionine and cysteine) or the desulfurization of sulfates. The fermentation of manure and other organic wastes shows typical H2S concentrations in the range of […]

Ultrasound Activated AD of Sludge

Anaerobic digestion process comprises of four major steps – hydrolysis, acidogenesis, acetogenesis and methanogenesis. The biological hydrolysis is the rate limiting step and pretreatment of sludge by chemical, mechanical or thermal disintegration can improve the anaerobic digestion process. Ultrasonic disintegration is a method for breakup of microbial cells to extract intracellular material. Ultrasound activated sludge […]

Food Waste Management Scenario

Food waste is an untapped energy source that mostly ends up rotting in landfills, thereby releasing greenhouse gases into the atmosphere. Food waste is difficult to treat or recycle since it contains high levels of sodium salt and moisture, and is mixed with other waste during collection. Major generators of food wastes include hotels, restaurants, […]

What is Biomethane

The typical composition of raw biogas does not meet the minimum CNG fuel specifications. In particular, the CO2 and sulfur content in raw biogas is too high for it to be used as vehicle fuel without additional processing. Biogas that has been upgraded by removing H2S, moisture and carbon dioxide is known as biomethane. Biomethane is […]

Anaerobic Digestion and Rural Development

The rural population of developing countries exhibit unique resource optimization capabilities as compared to urban populations. Tracts of land are cultivated and cattle are reared and the produce is sold off in the market or consumed. The wastes generated from crop cultivation and rearing animals are also utilised domestically. While the dung of animals is […]

Biogas Cleanup Methods

Cleanup of biogas is primarily achieved by carbon dioxide removal which enhances the energy value of the gas to give longer, driving distances with a fixed gas storage volume. Removal of carbon dioxide also provides a consistent gas quality with respect to energy value. The latter is regarded to be of great importance from the vehicle […]

Low Pressure Storage of Biogas

Selection of an appropriate biogas storage system makes a significant contribution to the efficiency and safety of a biogas plant.  A biogas storage system compensates fluctuations in the production and consumption of biogas as well as temperature-related changes in volume. There are two broad categories of biogas storage systems: Internal Biogas Storage Tanks are integrated into […]