Food Waste Management and Anaerobic Digestion

Food waste is one of the single largest constituent of municipal solid waste stream. In a typical landfill, food waste is one of the largest incoming waste streams and responsible for the generation of high amounts of methane. Diversion of food waste from landfills can provide significant contribution towards climate change mitigation, apart from generating revenues and creating employment opportunities.

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Of the different types of organic wastes available, food waste holds the highest potential in terms of economic exploitation 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 litter, sewage, crop residues, abattoir wastes etc or can be disposed in dedicated food waste disposers (FWDs). Rising energy prices and increasing environmental concerns makes it more important to harness clean energy from food wastes.

Anaerobic Digestion of Food Wastes

Anaerobic digestion is the most important method for the treatment of food waste because of its techno-economic viability and environmental sustainability. The use of anaerobic digestion technology generates biogas and preserves the nutrients which are recycled back to the agricultural land in the form of slurry or solid fertilizer. The relevance of biogas technology lies in the fact that it makes the best possible utilization of food wastes as a renewable source of clean energy.

A biogas 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. Thus, the benefits of anaerobic digestion of food waste includes climate change mitigation, economic benefits and landfill diversion opportunities.

Anaerobic digestion has been successfully used in several European and Asian countries to stabilize food wastes, and to provide beneficial end-products. Sweden, Austria, Denmark, Germany and England have led the way in developing new advanced biogas technologies and setting up new projects for conversion of food waste into energy.

Codigestion at Wastewater Treatment Facilities

Anaerobic digestion of sewage sludge is wastewater treatment facilities is a common practice worldwide. Food waste can be codigested with sewage sludge if there is excess capacity in the anaerobic digesters. An excess capacity at a wastewater treatment facility can occur when urban development is overestimated or when large industries leave the area.

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By incorporating food waste, wastewater treatment facilities can have significant cost savings due to tipping fee for accepting the food waste and increasing energy production. Wastewater treatment plants are usually located in urban areas which make it cost-effective to transport food waste to the facility. This trend is catching up fast and such plants are already in operation in several Western countries.

The main wastewater treatment plant in East Bay Municipal Utility District (EBMUD), Oakland (California) was the first sewage treatment facility in the USA to convert post-consumer food scraps to energy via anaerobic digestion. EBMUD’s wastewater treatment plant has an excess capacity because canneries that previously resided in the Bay Area relocated resulting in the facility receiving less wastewater than estimated when it was constructed. Waste haulers collect post-consumer food waste from local restaurants and markets and take it to EBMUD where the captured methane is used as a renewable source of energy to power the treatment plant. After the digestion process, the leftover material is be composted and used as a natural fertilizer.

The first food waste anaerobic digestion plant in Britain to be built at a sewage treatment plant is the city of Bristol. The plant, located at a Wessex Water sewage works in Avonmouth, process 40,000 tonnes of food waste a year from homes, supermarkets and business across the southwest and generate enough energy to power around 3,000 homes.

Ingredients of Environmental Sustainability

Global interest in environmental sustainability is on the rise. Businesses and individuals are making efforts to engage in more environmentally conscious practices, thanks in part to a growing worldwide population and dwindling natural resources. Ultimately, sustainability is the practice of finding long-lasting methods of maintaining our existing quality of life while still preserving the environment and natural resources.

Proponents must consider all aspects of environmental sustainability for it be successful. Additionally, eco-conscious thought must be applied to multiple professions to achieve deep-rooted results. Here are three ingredients to ensure the continued success of environmental sustainability.

Economic Incentives

Everyone knows change can be difficult. Making the shift toward more eco-friendly practices is no different. One way to initiate this change is through financial incentives. Money is an essential factor for families and companies. If sustainable options and practices are too expensive the majority of the population can’t afford to implement them, the environmentally-conscious movement will come grinding to a halt.

Environmentally-friendly technology often carries higher upfront costs but pays off through long-term benefits, both to the environment and to individuals. Additionally, companies that invest in environmentally conscious technology can potentially market to a broader range of consumers with similar interests and values.

When considering options to follow more sustainable practices, consumers need to set specific goals they would like to achieve and define their plan of action. This will also help maintain perspective and keep the focus on the long-term incentives, which will keep everyone motivated to continue down the road to sustainability.

Environmental Protection

Another key factor in environmental sustainability is protecting and preserving the environment. Part of this practice includes sustainable use and management procedures. While specific materials may be renewable over time, overuse can deplete these resources and lead to shortages. Industry professionals must give careful consideration to planning how, when and in what quantity resources will be used.

Surprisingly, several sustainable methods exist to renew depleted environmental resources in a fast and environmentally conscious manner. Agricultural practices often strip fields of necessary minerals and nutrients while leaving behind harmful inorganic residuals from fertilizers.

Naturally occurring microorganisms will eventually restore the soil’s nutrients and neutralize noxious compounds, though this process takes a long time. Bioremediation can expedite this process. Industry professionals can introduce higher numbers of the naturally occurring microbes and then create their optimal living conditions by varying the amount of water and food they have available.

Once the harmful pollutants are neutralized, farmers can resume planting operations. In addition to bioremediation, sustainable agricultural practices include rotating crops and using cover crops. Rotating crops and using cover crops can help reduce the occurrence of weeds and the impact of pests. In turn, farmers can use less fertilizer and maintain soil health for more extended periods.

Fostering interest in sustainability at a young age will encourage future leaders

Education

Without proper education, the general public won’t understand the importance of sustainability. This may lead to a decreased demand for sustainable products and procedures, which will foster growth in non-sustainable markets and practices. Future generations will then be left with the task of preserving and repairing the environment.

Fostering interest in sustainability at a young age will encourage future leaders to create innovative solutions to meet the current demands of society through unconventional and eco-conscious means. The future youth will also need the proper educational background to develop the tools they need to cultivate these solutions.

Environmental education also helps adults understand the impact their choices have on themselves and society. Uneducated adults may not recognize their choices to pollute or use toxic chemicals are degrading the local water supply for their neighbors or are harmful to their health. Once they understand the full weight of their decisions, they will be able to make the most informed choices.

With proper management and forethought, environmental sustainability can be fully achievable in our society today.

NatHERS – A Tool To Maximize Sustainability of Your Future Home

Short for the Nationwide House Energy Rating Scheme, NatHERS uses a 10-star rating system which is able to easily access the thermal performance of buildings within Australia. Though a NatHERS certification is required for all new developments with multiple dwellings, it is essential for all residents to obtain an assessment to be able to easily evaluate the thermal assessment of their development.

At Certified Energy, our years of experience distinguishes us from our competitors. We work with each client separately, to ensure that each individual project thrives in terms of cost, efficiency and the preservation of design concepts.

We strive to minimize your costs whilst maximizing the sustainability of your future home.

Why is NatHERS assessment required?

NatHERS as outlined above is the Nationwide House Energy Rating Scheme which is able to evaluate the thermal performance of any dwelling. Though this may seem irrelevant and unnecessary when outlining the overall performance of the building, it is a necessity to get a NatHERS assessment in order to ensure a sustainable future for our environment.

Not only this, but NatHERS is essential when obtaining a BASIX assessment. BASIX is a NSW Government initiative striving to improve the environmental sustainability. It comprises of three factors: water, thermal and energy. The thermal component of BASIX can be easily completed through a NatHERS assessment with its thorough, accurate and flexible approach to addressing thermal performance.

Thus, a NatHERS assessment is required not only to contribute towards a sustainable future for the environment but also as a necessity under the BASIX initiative led by the NSW Government.

What does a NatHERS assessment include?

A NatHERS assessment can be obtained by a specialised company that has NatHERS Accredited Software which can be used to determine the thermal efficiency of your home. Within the assessment, each resident will be provided a copy of the key design features and the building materials and the scope used to generate the dwelling’s star rating.

The star rating, also known as the Energy or Thermal Efficiency star rating, is an accurate indicator of the level of heating or cooling your building requires to not only make you feel comfortable, but to ensure that it doesn’t have a detrimental impact on the environment. By following the recommendations and guidelines that will be included in your report, you will also be on the path of having lower energy expenses, by using the appropriate amount of electricity.

How does Certified Energy do it differently?

At Certified Energy, there are two main certification solutions that will help you achieve the lowest cost with the highest efficiency rating. These include the essential solutions (House Energy Rating Scheme, Elemental Provision) or alternative solutions (Verification Using a Reference Building and State Specific Energy Protocols).

In order to give you the best catered advice as per your personal needs, Certified Energy will guide you through the various approval pathways that will help your project achieve energy efficiency and environmental sustainability.