Renewable Energy Waste


Renewable Energy Waste – Food waste is an underutilized renewable energy source that often rots in landfills, releasing greenhouse gases into the atmosphere. Food waste is difficult to process or recycle because it contains high levels of sodium salts and moisture and mixes with other waste during collection. The main generators of food waste are hotels, restaurants, supermarkets, apartment blocks, cafeterias, airline suppliers and food processing industries.

According to the EPA, about 63.1 million tons of food waste went to landfills or incinerators in the United States in 2018. For the United Kingdom, households throw away 6.6 million tons of food every year. These figures are indicative of the large amount of food waste produced worldwide.

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The proportion of food waste in the municipal waste stream is gradually increasing, hence the need to design a proper food waste management strategy to ensure environmentally friendly and sustainable disposal. Currently, only about 3 percent of food waste is recycled across the United States, mostly through composting. Composting offers an alternative to landfilling food waste, although it requires large areas, produces volatile organic compounds and consumes energy. Consequently, there is an urgent need to explore better recycling options.

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Anaerobic digestion has been used successfully in many European and Asian countries to stabilize food waste and provide useful end products. Sweden, Austria, Denmark, Germany and England have led the way in developing new advanced biogas technologies and creating new projects for converting food waste into energy.

Anaerobic digestion is one of the most important methods for the treatment of organic waste such as food waste due to its techno-economic viability and environmental sustainability. Anaerobic digestion produces renewable energy from food waste in the form of biogas and conserves nutrients that are recycled into agricultural soil as dust or solid manure.

The importance of biogas technology is that various organic wastes can be used as a renewable source of clean energy. A biogas plant is a decentralized energy system that is self-sufficient in heat and power needs and at the same time reduces environmental pollution. Thus, anaerobic digestion of food without wasting it can lead to climate change mitigation, economic benefits and opportunities for landfill diversion.

Among the different types of biological waste available, food waste has the highest potential in terms of economic utilization, as it contains high carbon content and can be efficiently converted into biogas and biofertilizer. Food waste can be used either as the sole substrate in a biogas plant, or it can be co-digested with organic waste such as cow manure, poultry waste, sewage, crop residues and slaughterhouse waste.

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Raw materials for food waste-to-energy plants are food waste, vegetable waste, stale cooked and uncooked food, meat, tea bags, napkins, extracted tea powder, dairy products, etc. Less than 12 mm. The main purpose of shredding is to produce a uniform feed and reduce plant “down time” due to pipe blockage by large feed particles. This improves mechanical action and digestibility and enables easy removal of plastic bags or cling film from waste.

Fresh waste and recirculated digestate (or digested food waste) are mixed in a mixing tank. Digestate is added to adjust the solids content of the waste stream entering the digestion system to the desired solids content (10 to 12 percent of total solids) of 20 to 25 percent (of incoming waste ). The consolidated waste stream is pumped into a feed tank from which the anaerobic digestion system is continuously fed. The feed tank also acts as a pre-digestor and is heated to 55º to 60º Celsius to remove pathogens and facilitate the growth of thermophilic microorganisms for rapid waste degradation.

From the predigester tank, the sludge enters the main digester where it undergoes anaerobic digestion.

Group A anaerobic digester is a CSTR reactor with an average retention time of 15 to 20 days. The digester operates in the mesophilic temperature range (33º to 38°C) and heating takes place within the digester. Food waste is highly biodegradable and has a higher rate of volatile solids degradation (86 to 90 percent) than biosolids and livestock manure. According to a conservative estimate, each ton of food waste generates 150 to 200 m

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Biological desulfurization S occurs in a unit where a limited amount of air is added to the biogas in the presence of specific aerobic H-oxidizing bacteria.

S in elemental sulfur. Biogas produced as a result of anaerobic digestion of waste is sent to a gas holder for temporary storage. Biogas is used in a combined heat and power (CHP) unit to convert it into heat and electricity in a cogeneration plant of suitable capacity. The exhaust gases from the CHP unit are used to meet the heating requirements of the process.

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The dissolved substrate leaving the reactor contains nutrients such as nitrogen, potassium and phosphorus, which are beneficial to plants and soil. The digested slurry is then fed through a series of screw presses to remove moisture from the slurry. Solar drying and additives are used to increase the market value and handling characteristics of fertilizers.

Food waste is one of the largest components of municipal solid waste. Diverting food waste from landfills can significantly contribute to climate change mitigation as well as income and employment generation. Rising energy prices and increasing environmental pollution make it even more important to harness renewable energy from food waste and create a sustainable food supply chain.

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Anaerobic digestion technology is widely available worldwide and many European and Asian countries already have successful projects, which waste generators and environmental agencies require for sustainable food waste management systems.

About Salman Zafar Salman Zafar is the CEO of BioEnergy Consult and an international consultant, advisor and trainer specializing in waste management, biomass energy, energy from waste, environmental protection and resource conservation. Its geographical areas include Asia, Africa and the Middle East. Salman has successfully completed many projects in the field of biogas technology, biomass energy, waste to energy, recycling and waste management. Salman has participated in many national and international conferences around the world. He is a renowned environmental journalist and has written more than 300 articles in reputed journals, magazines and websites. Also, he is actively involved in creating awareness about renewable energy, waste management and environmental sustainability through his blogs and portals. Salman can be reached at salman@ or [email protected].

Biogas from food waste, CHP, Europe, Food waste, Food waste, Food waste, UK food waste, Food waste to power plant, Landfills, Food waste, Renewable energy from the United States . Bookmark the permalink.

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Essential cookies are essential for the website to function properly. This category only includes cookies that ensure the basic functionality and security features of the website. These cookies do not store any personal information. Today’s modern and engineered landfill is an environmentally friendly waste management system. Landfills provide a clean, renewable source of energy that is continuously generated through the decomposition of waste. This source is called landfill gas.

Landfill gas is a natural byproduct of the waste that is emitted every day. Each person in the United States produces approximately 4.5 pounds of waste per day, and 50% of this waste is managed in municipal solid waste landfills, such as mill site landfills. Organic matter dumped in landfills, including food and waste from wastewater treatment processes, promotes the decomposition process. Landfill gas is typically 50% methane (the main component of natural gas) and 50% carbon dioxide, so this gas is not much different than the natural gas that comes to your home through your local utility.

Most waste is collected in landfill gas, a greenhouse gas, and burned in a flare system to destroy it. Waste treatment uses this gas in various applications to generate green energy instead of throwing it away. Converts mill landfill gas into electricity. This gas is collected and removed through wells. To connect the gas well,

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