Net-Zero-Energy Model for Sustainable Wastewater Treatment

Yan, Peng; Qin, Rong-cong; Guo, Jinsong; Yu, Qiang; Li, Zhongyang; Chen, You‐Peng; Shen, Yu; Fang, Fang

doi:10.1021/acs.est.6b04735

Cited by 77 publications

(46 citation statements)

References 31 publications

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“…When considering water management and agricultural demand, the contribution could even reach 4-5% (Longo et al 2016). It is estimated that the electricity required for wastewater treatment will increase by 20% in the next 15 years in the developed countries, leading to a significant increase in CO 2 emissions and resource consumption (Yan et al 2017). Many factors influence the energy consumption for wastewater treatment.…”

Section: Energy Consumption In Wwtpsmentioning

confidence: 99%

Achieving energy neutrality in wastewater treatment plants through energy savings and enhancing renewable energy production

Maktabifard

Zaborowska

Mąkinia

2018

Rev Environ Sci Biotechnol

217

106

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Wastewater treatment plants (WWTPs) consume high amounts of energy which is mostly purchased from the grid. During the past years, many ongoing measures have taken place to analyze the possible solutions for both reducing the energy consumption and increasing the renewable energy production in the plants. This review contains all possible aspects which may assist to move towards energy neutrality in WWTPs. The sources of energy in wastewater were introduced and different indicators to express the energy consumption were discussed with examples of the operating WWTPs worldwide. Furthermore, the pathways for energy consumption reductions were reviewed including the operational strategies and the novel technological upgrades of the wastewater treatment processes. Then the methods of recovering the potential energy hidden in wastewater were described along with application of renewable energies in WWTPs. The available assessment methods, which may help in analyzing and comparing WWTPs in terms of energy and greenhouse gas emissions were introduced. Eventually, successful case studies on energy self-sufficiency of WWTPs were listed and the innovative projects in this area were presented.

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Section: Energy Consumption In Wwtpsmentioning

confidence: 99%

Achieving energy neutrality in wastewater treatment plants through energy savings and enhancing renewable energy production

Maktabifard

Zaborowska

Mąkinia

2018

Rev Environ Sci Biotechnol

217

106

View full text Add to dashboard Cite

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“…Electricity consumption in sewage wastewater treatment accounts for 1-3% of domestic electricity consumption in developed countries (Maktabifard et al, 2018) while sewage potentially has much more bio-mass energy in itself (Shizas and Bagley, 2004). Anaerobic digestion of sewage sludge has received significant attention to neutralize this energy imbalance (Yan et al, 2017). In Japan, 1.5 × 10 10 m 3 ·yr −1 of sewage water is treated in sewage wastewater treatment plants, which includes ∼400 mg·L −1 of chemical oxygen demand (COD).…”

Section: Introductionmentioning

confidence: 99%

On Site Evaluation of a Tubular Microbial Fuel Cell Using an Anion Exchange Membrane for Sewage Water Treatment

2019

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This study evaluated the performance of a tubular microbial fuel cell (MFC) having a core of air-chamber wrapped with an anion exchange membrane in sewage wastewater treatment. Three MFCs were vertically assembled into one module and floated in sewage water channels before and after treatments in the primary sedimentation tank. The two MFC-modules exhibited nearly similar electricity production in the range of 1.3-5.7 Wh·m −3 -MFC while the bottom MFCs (60-90 cm) showed a decrease in electricity compared with the top (0-30 cm) and the middle MFCs (30-60 cm) due to the water leakage into air-cathode. One MFC module was then evaluated for its chemical oxygen demand (COD) removal efficiency with two external resistances of 27 and 3 in a chemostat reactor (MFC:reactor = 1:5, v/v) using three hydraulic retention times (HRTs), i.e., 3, 6, and 12 h. The best COD removal efficiency (COD-RE MFC ), 54 ± 14%, and BOD removal efficiency, 37 ± 17%, were observed with a resistance of 3 and a 12 h HRT, which resulted in 3.8 ± 2.0 A·m −3 of current recovery and 15 ± 7.5% of Coulombic efficiency. The electricity generation efficiency (EGE MFC ) was the best with a resistance of 27 and a 12 h HRT, accounting for 0.19 ± 0.12 kWh·kg-COD −1 with a 17 ± 6.4% COD-RE MFC and 0.65 ± 0.10 Wh·m −3 electricity production. Based on calculations using the COD-RE MFC and EGE MFC, the integration of MFC treatments prior to aeration can reduce wastewater treatment electricity consumption by 55%.

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“…Additionally, the energy consumption in conveyance is several times more than that in treatment ( Englehardt et al., 2013 ). The massive energy consumption in collection and treatment will finally result in negative impacts of environment, waste of resource and cost in construction and operation ( Yan et al., 2017 ). Therefore, there is a paradox in existing sewage treatment processes, that is, the use of a large number of energy and chemicals to treat sewage, but eventually results in a huge waste of resource and a heavy burden to both environment and economy.…”

Section: Introductionmentioning

confidence: 99%

Life cycle cost and environmental assessment for resource-oriented toilet systems

Shi

Zhou

et al. 2018

Journal of Cleaner Production

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The rich content of nutrients in human waste provides an outlook for turning it from pollutants to potential resources. The pilot-scale resource-oriented toilet with forward osmosis technology was demonstrated to have advantages to recover clean water, nitrogen, phosphorus, potassium, biogas, and heat from urine and feces. For the possibility of further full-scale implementation in different scenarios, six resource-oriented toilet systems and one conventional toilet system were designed in this study. The methodology of cost-benefit analysis and life cycle assessment were applied to analyze the life cycle economic feasibility and environmental sustainability of these systems. As results indicated, resource-oriented toilets with forward osmosis technology concentrating urine proved to have both economic and environmental benefit. The economic net present value results of new resource-oriented toilets were much better than conventional toilet. The energy consumption in resource-oriented toilets contributes a lot to the environmental impacts while resource recovery such as the fertilizer production and fresh water harvest in resource-oriented toilet systems offsets a lot. Taking both life cycle economic feasibility and environmental sustainability into consideration, the partial resource-oriented toilet (only recovering nutrients from urine) is the best choice, and the totally independent resource-oriented toilet could be applied to replace conventional toilets in areas without any external facilities such as sewer and water supply system etc.

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Net-Zero-Energy Model for Sustainable Wastewater Treatment

Cited by 77 publications

References 31 publications

Achieving energy neutrality in wastewater treatment plants through energy savings and enhancing renewable energy production

Achieving energy neutrality in wastewater treatment plants through energy savings and enhancing renewable energy production

On Site Evaluation of a Tubular Microbial Fuel Cell Using an Anion Exchange Membrane for Sewage Water Treatment

Life cycle cost and environmental assessment for resource-oriented toilet systems

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