scholarly journals EXERGY AND EMERGY: COMPLEMENTARY TOOLS FOR ASSESSING THE ENVIRONMENTAL SUSTAINABILITY USE OF BIOSOLIDS GENERATED IN WASTEWATER-TREATMENT PLANT FOR ENERGYPRODUCTION

Química Nova ◽  
2021 ◽  
Author(s):  
Natalia Cano ◽  
Santiago Céspedes-Zuluaga ◽  
Camilo Guerrero-Martin ◽  
Darío Gallego
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Environmental Sustainability ◽  
Production System ◽  
Energy Production ◽  
Exergy Analysis ◽  
Treatment Plant ◽  
Waste Streams ◽  
Gas Cleaning ◽  
Energy Production System

Taking advantage of the energy contained in the biosolids generated in a wastewater treatment plant (WWTP) is one of the processes of greatest interest due to the opportunity to obtain an energy resources from a waste. The aim of this research was to analyze the environmental sustainability use of biosolids generated in a wastewater-treatment plant for energy-production by fluidized-bed gasification under exergy analysis. The energy-production system was based on previous studies of sustainable-emergy alternatives using biosolids. Sustainability of the process was evaluated by identifying stages in the energy-production system (from drying application to electricity generation) where it is possible to reduce useful energy losses as well as identifying the value of waste streams within the system through exergy analysis. It was illustrated the destroyed exergy and the efficiency by stage and by product in order to assess the effects of inefficiencies in the process sustainability. The mixture of biosolids with coal was identified as a highly sustainable stage of the process, as it presents the highest index of exergy sustainability (0.99), in contrast to the stages of energytransformation (turbine) and gas-cleaning, which efficiencies are 0.17 and 0.4, respectively. Energy-transformation and gas-cleaning stages are of interest in terms of an improved energy recovery process, making it more efficient by applying new technologies and/or using the waste streams that have high energy potentials.

scholarly journals Measurement of Energy Production from Biogas: Evidence from the Wastewater Treatment Plant in Durres

2020 ◽  
Vol 5 (10) ◽  
pp. 1260-1262
Author(s):  
Stela Sefa ◽  
Tania Floqi ◽  
Julian Sefa
Keyword(s):  
Energy Efficiency ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Energy Production ◽  
Biogas Production ◽  
Treatment Plant ◽  
Electricity Consumption ◽  
Waste To Energy ◽  
Energy Requirements ◽  
Daily Consumption

The wastewater treatment plant serving the city of Durres, which is the second most populous city of Albania, employs the tertiary advanced wastewater treatment method and engages in biogas production to achieve energy efficiency. In order to empirically evaluate the plant’s energy efficiency realization, the total biogas produced and converted to electricity for daily consumption was measured during a three years period (2016 - 2018). The highest electricity produced was recorded in 2016, with a daily average of 844kWh compared to 550kWh and 370kWh in 2017 and 2018, respectively. So that the plant meets proper criteria to classify as an energy-efficient entity, 30.0 percent of its electricity consumption must be derived from biogas. Converted in kWh, the plant should generate 2,975 kWh/day. Based on the biomass and energy values measured during the study period, it is concluded that electricity supplied from biogas met 6.0 percent of the plant’s energy requirements, or one fifth of the energy-efficiency target. While the plant was successful in carrying out the full waste-to-energy production process, the electricity supplied from biogas was very low and did not fulfil the plant’s self-energy requirements.

An experimental examination of energy production from domestic-based waste water treatment sludge

2015 ◽  
Vol 12 (1) ◽  
pp. 45-50
Author(s):  
Selman Cagman ◽  
Volkan Coban ◽  
Muharrem Eyidogan ◽  
Fatma Canka Kilic ◽  
Durmus Kaya
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Wastewater Treatment Plant ◽  
Energy Production ◽  
Manufacturing Industry ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Population Total ◽  
Advantages And Disadvantages

In Turkey, treatment sludge that obtained from domestic wastewater and water treatment plants causes storage and disposal problems. In the current situation, there are 69 domestic wastewater treatment plants in Turkey and this corresponds to approximately 13% of the population. Total 500 thousand tons of treatment sludge is released from these treatment plants, annually. In the case of all municipalities establish a wastewater treatment plant in Turkey, approximately, 4 million tons of treatment sludge is projected to release in a year. Additionally, 3.6 million tons of treatment sludge will be obtained from the manufacturing industry. In other words, approximately 7.6 ↔ 106 tons of treatment sludge potential exists in Turkey and in the same amount of the storage area (7.6 ↔106m3) is needed for the storage of this treatment sludge, perennially. In this study, energy production from wastewater treatment sludge through the anaerobic method has been investigated and compared to the aerobic treatment method. Also, advantages and disadvantages of both methods have been introduced. In order to determine biogas production capacity from treatment sludge, some amount of sample sludge has been taken from the final sedimentation tank before belt press in a wastewater treatment plant and it has been experimentally analyzed.

Operating experiences with a molten carbonate fuel cell at Stuttgart-Möhringen wastewater treatment plant

2012 ◽  
Vol 65 (5) ◽  
pp. 789-794 ◽  
Author(s):  
C. Locher ◽  
C. Meyer ◽  
H. Steinmetz
Keyword(s):  
Wastewater Treatment ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Electrical Energy ◽  
Molten Carbonate Fuel Cell ◽  
Molten Carbonate ◽  
Gas Cleaning

Fuel cells on wastewater treatment plants are a relatively new technology to convert biogas from anaerobic digestion into thermal and electrical energy. Since the end of 2007, a type of MCFC fuel cell (>250 kWel, 180 kWth) has been installed at Stuttgart-Möhringen wastewater treatment plant. The goals of this research project are to raise the power self-sufficiency in Stuttgart-Möhringen, to further optimise high temperature fuel cells using biogas and to gain practical experience. After approximately 9,000 h of operation, a mean electrical ‘gross’-efficiency of 44% was achieved. To fully exploit this high electrical efficiency, it is essential to keep the energy consumption of peripheral devices (gas pressure unit, gas cleaning unit, etc.) of the fuel cell as low as possible.

Exergetic Assessment of Biogas Engine-Driven Heat Pump Systems for Using Sewage Resource

2012 ◽  
Vol 455-456 ◽  
pp. 1251-1256
Author(s):  
Xiao Ming Li ◽  
Wen Xia Wang ◽  
Ai Jie Wang ◽  
Zhi Yao Wang ◽  
Yue Shi
Keyword(s):  
Wastewater Treatment ◽  
Heat Pump ◽  
Wastewater Treatment Plant ◽  
Exergy Analysis ◽  
Weak Link ◽  
Treatment Plant ◽  
Exergy Efficiency ◽  
Energy Utilization ◽  
Utilization Rate ◽  
Exergy Losses

In order to improve energy utilization rate of biogas engine-driven heat pump (BEHP) systems for wastewater treatment plant, the exergy analysis is applied in this paper. The paper concludes the exergy losses and exergy efficiency of each equipment, and reveals the weak link of energy transformation of the whole system. According to the calculation of one example, the location of maximum exergy loss is the biogas engine-driven, while the location of minimum exergy efficiency is the compressor, which provides powerful theoretic references to improve and optimize BEHP systems for wastewater treatment plant.

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