Essay On Energy Recovery

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Energy Recovery
Anaerobic treatment gives a high potential of energy recovery from wastewater in form of biogas. The effluent can also serve industrial heating and cooling purposes. Wastewater has a huge potential of electricity generation. Technologies exist for on-site energy recovery through sludge/biosolids treatment processes integrated in wastewater treatment plants, allowing for transition from major energy consumers to energy producers.
Strict standards for discharge often require energy intensive advanced treatment technologies. As a result, the number of plants using advanced treatment has increased [17]. Rising energy costs and concerns about greenhouse gas generation present a major incentive for tracking energy usage of
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Biogas is a mixture essentially comprising mostly methane (CH4, around 55-75%) but also contains carbon dioxide (CO2, around 25-30%), varying quantities of water (H2O) and hydrogen sulphide (H2S). The thermal energy available from the methane contained in biogas is about 6 to 8 kWh/m3. This corresponds to half a litre of diesel oil and 5.5 kg of firewood [21].
4.2 Microbial Fuel Cell Technology
Wastewater treatment is an energy intensive process, consuming about 1,900 kJ/m3 of treated wastewater [22]. Wastewater contains almost 9 times more energy than the energy used to treat an equivalent volume, thus creating the need to harness this energy through the use of a Microbial Fuel Cell (MFC) [22]. Microbial Fuel cell (MFC) is a device designed for electricity generation in the process of wastewater treatment [23]. Microbial fuel cell is a new form of renewable energy, which uses bacteria in wastewater to convert organic matter into electricity, while simultaneously treating the wastewater. MFCs can provide an answer to several of the problems which traditional wastewater treatment faces. They enable the recovery of energy out of the wastewater, while limiting both the energy input and the excess sludge production [24].
5.0 Nutrient recovery
Wastewater nutrients are resources that can generate revenues for treatment plants while helping meet environmental regulations. Wastewater and municipal sludge, can be a reliable source of nutrients, in particular
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