scholarly journals A Review of Sludge-to-Energy Recovery Methods

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 60 ◽  
Author(s):  
Jumoke Oladejo ◽  
Kaiqi Shi ◽  
Xiang Luo ◽  
Gang Yang ◽  
Tao Wu
Keyword(s):  
Sewage Sludge ◽  
Energy Recovery ◽  
Recovery Process ◽  
Metal Pollutants ◽  
Recovery Processes ◽  
Recent Developments ◽  
Cost Competitiveness ◽  
Treatment Facilities ◽  
Heavy Metal Pollutants ◽  
The Impact

The increasing volume of sewage sludge from wastewater treatment facilities is becoming a prominent concern globally. The disposal of this sludge is particularly challenging and poses severe environmental hazards due to the high content of organic, toxic and heavy metal pollutants among its constituents. This study presents a simple review of four sewage to energy recovery routes (anaerobic digestion, combustion, pyrolysis and gasification) with emphasis on recent developments in research, as well as benefits and limitations of the technology for ensuring cost and environmentally viable sewage to energy pathway. This study focusses on the review of various commercially viable sludge conversion processes and technologies used for energy recovery from sewage sludge. This was done via in-depth process descriptions gathered from literatures and simplified schematic depiction of such energy recovery processes when utilised for sludge. Specifically, the impact of fuel properties and its effect on the recovery process were discussed to indicate the current challenges and recent scientific research undertaken to resolve these challenges and improve the operational, environmental and cost competitiveness of these technologies.

scholarly journals Heavy metal pollutants have additive negative effects on honey bee cognition

2020 ◽  
Author(s):  
Coline Monchanin ◽  
Erwann Drujont ◽  
Jean-Marc Devaud ◽  
Mathieu Lihoreau ◽  
Andrew B Barron
Keyword(s):  
Heavy Metal ◽  
Honey Bee ◽  
Memory Retrieval ◽  
Environmental Pollutants ◽  
Negative Effects ◽  
Metal Pollutants ◽  
Major Threat ◽  
Heavy Metal Pollutants ◽  
The Impact ◽  
Pathways Of Toxicity

Environmental pollutants can exert sublethal deleterious effects on animals. These include disruption of cognitive functions underlying crucial behaviours. While agrochemicals have been identified as a major threat to pollinators, other compounds, such as heavy metals that are often found in complex mixtures, have largely been overlooked. Here, we assessed the impact of acute exposure to field-realistic concentrations of lead, copper, arsenic, and their combinations, on honey bee learning and memory. All treatments involving single metals slowed down appetitive learning and disrupted memory retrieval at 24 h. Importantly, combinations of these metals induced additive negative effects on both processes, suggesting common pathways of toxicity. Our results highlight the need to further assess the risks of heavy metal pollution on invertebrates and to their associated ecosystem services.

131 Concerns of The Unheard: A Qualitative Systematic Review on The Preoperative Concerns of General Surgery Patients

2021 ◽  
Vol 108 (Supplement_2) ◽  
Author(s):  
J Y J Cheng ◽  
Y H Chin ◽  
B W Z Wong ◽  
Z H Ong ◽  
C H Ng ◽  
...  
Keyword(s):  
General Surgery ◽  
Recovery Process ◽  
Complementary Therapy ◽  
Postoperative Recovery ◽  
Postoperative Outcomes ◽  
Care Provision ◽  
Recovery Processes ◽  
Qualitative Systematic Review ◽  
Provision Of Care ◽  
The Impact

Abstract Aim Preoperative care is important for patients and healthcare professionals (HCPs), and greatly influences patients’ postoperative outcomes. This review aims to provide an in-depth understanding of the concerns general surgery patients have in the preoperative period and discover solutions to improve their care. Method CINAHL, Medline, PsycINFO, and Web of Science were searched, and articles related to patients’ preoperative concerns were included. Key quotes were extracted, coded, and thematically analyzed according to Thomas and Harden’s methodology. Results Three themes were generated from the 27 included articles; lead-up to surgery, the postoperative recovery process, and HCP care provision. Patients were uncertain and concerned about the impact the surgery or disease may have on them while they waited for their surgery to occur. Additionally, perceived inadequate provision of care by patients led to them doubting their HCPs’ ability, heightening their preoperative anxiety. Lastly, postoperative recovery processes were often unclear, leading to increased distress as patients wonder if they could recover from the disease and/or surgery. Conclusions Unresolved preoperative concerns increase patients’ anxiety and uncertainty, negatively affecting their postoperative recovery. A combination of individualized preoperative education and complementary therapy can be implemented by HCPs to alleviate these concerns, leading to better postoperative outcomes.

Modeling and Simulation for Super Capacitor Braking Energy Recovery Process of Micro EV

2011 ◽  
Vol 383-390 ◽  
pp. 7390-7395
Author(s):  
Jin Yu Qu ◽  
Li Yan Liang
Keyword(s):  
Energy Storage ◽  
Electric Vehicle ◽  
Energy Recovery ◽  
Discharge Rate ◽  
Recovery Process ◽  
Storage Device ◽  
Energy Storage Device ◽  
Super Capacitor ◽  
The Impact ◽  
Braking Energy Recovery

Super-capacitor is suitable as braking energy storage device for electric vehicle because of its high charge and discharge rate, long life, simple structure and reliable performance advantages. When driving motor of the electric vehicles runs on regenerative electric power state, it can not only provide braking force, but also charge to the energy storage device to recover the kinetic energy, thus endurance mileage of electric vehicle can be extended considerably. In this paper, braking energy recovery model was built by using the Matlab/Simulink software, and whole vehicle model based on automobile theory, the motor efficiency model and super-capacitor model were mainly included. Meanwhile some researches were made on the simulation, and the impact of the super-capacitor on the braking energy recovery was analyzed.

scholarly journals Sewage sludge as barrier material for heavy metals in waste landfill

2016 ◽  
Vol 42 (2) ◽  
pp. 52-58 ◽  
Author(s):  
Huyuan Zhang ◽  
Bo Yang ◽  
Guangwei Zhang ◽  
Xuechao Zhang
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Hydraulic Conductivity ◽  
Sewage Sludge ◽  
Dry Density ◽  
Barrier Material ◽  
Metal Pollutants ◽  
Waste Landfill ◽  
Compaction Test ◽  
Heavy Metal Pollutants

Abstract Heavy metal pollutants in the leachate of waste landfill are a potential threat to the environment. In this study, the feasibility of using municipal sewage sludge as barrier material for the containment of heavy metal pollutants from solid waste landfills was evaluated by compaction test and hydraulic conductivity test concerning compaction property, impermeability and heavy metal retardation. Results of the compaction test showed that the maximum dry density of 0.79 g·cm−3 was achieved at the optimum water content of about 60%. The hydraulic conductivities of compacted sewage sludge permeated with synthetic heavy metal solutions were in the range of 1.3×10−8 – 6.2×10−9 cm·s−1, less than 1.0 ×10−7cm·s−1 recommended by regulations for barrier materials. Chemical analyses on the effluent from the hydraulic conductivity tests indicated that the two target heavy metals, Zn and Cd in the permeants were all retarded by compacted sewage sludge, which might be attributed to the precipitation and adsorption of heavy metal ions. The results of this study suggest that specially prepared material from sewage sludge could be used as a barrier for waste landfills for its low permeability and strong retardation to heavy metal pollutants.

Some Recent Developments in Sewage Sludge Pumping

1988 ◽  
Vol 20 (4-5) ◽  
pp. 227-236
Author(s):  
J. H. Lohmann ◽  
W. F. Garber
Keyword(s):  
Sewage Sludge ◽  
Treatment Plant ◽  
Rheological Characteristics ◽  
Volatile Content ◽  
Collection System ◽  
Positive Displacement ◽  
Low Viscosity ◽  
Recent Developments ◽  
Cylinder Piston ◽  
Pumping Equipment

The pumping of sewage sludge solids is reviewed in terms of handling high and low viscosity materials with solids concentrations varying from about 4 % to perhaps 50 %. Knowledge of rheological characteristics including thixotropy is necessary in designing pumping systems with sludge solids percentages, volatile content, particle size, abrasives content and temperatures being variables which could change pump types found suitable from facility to facility. The characteristics of a sewage collection system is also important in determining pumping parameters needed in a treatment plant. Solids handling equipment from other industries have made significant contributions to sewage solids pumping in recent years. Included are moyno-type progressing cavity screw-centrifugal, recessed impeller rotation piston positive displacement, and two cylinder piston S-transfer positive displacement pumps. Pumping equipment used in the F.R.G. and in Southern California in the U.S.A. is remarkably similar. These types of pumps offer the possibility of designing optimum solids dewatering and transfer systems.

Theory and Method and the Stakes of a Fragmented Discipline: Or, What Economics Taught Me About the Study of Religion

2020 ◽  
Author(s):  
Thomas A Lewis
Keyword(s):  
Religious Studies ◽  
The Public ◽  
Global Pandemic ◽  
Recent Developments ◽  
The Common ◽  
The Impact ◽  
Academic Study

Abstract As a discipline, the academic study of religion is strikingly fragmented, with little engagement or shared criteria of excellence across subfields. Although important recent developments have expanded the traditions and peoples studied as well as the methods used, the current extent of fragmentation limits the impact of this diversification and pluralization. At a moment when the global pandemic is catalyzing profound pressures on our universities and disciplines, this fragmentation makes it difficult to articulate to the public, to non-religious studies colleagues, and to students why the study of religion matters. We therefore too often fall back on platitudes. I argue for a revitalized methods and theories conversation that connects us even as it bears our arguments and disagreements about what we do and how. Courses in methods and theories in the study of religion represent the most viable basis we have for bringing the academic study of religion into the common conversation or argument that constitutes a discipline without sacrificing our pluralism.

scholarly journals Scenario Analysis for Selecting Sewage Sludge-to-Energy/Matter Recovery Processes

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 276
Author(s):  
Francesco Facchini ◽  
Giovanni Mummolo ◽  
Micaela Vitti
Keyword(s):  
Sewage Sludge ◽  
Scenario Analysis ◽  
Value Chain ◽  
Circular Economy ◽  
Solid Material ◽  
Sludge Treatment ◽  
Sewage Sludges ◽  
Recovery Processes ◽  
Sewage Sludge Treatment ◽  
New Perspective

The sewage sludges are the byproducts of the wastewater treatment. The new perspective of the wastewater value chain points to a sustainable circular economy approach, where the residual solid material produced by sewage sludge treatments is a resource rather than a waste. A sewage sludge treatment system consists of five main phases; each of them can be performed by different alternative processes. Each process is characterized by its capability to recover energy and/or matter. In this paper, a state of the art of the sludge-to-energy and sludge-to-matter treatments is provided. Then, a scenario analysis is developed to identify suitable sewage sludge treatments plants that best fit the quality and flowrate of sewage sludge to be processed while meeting technological and economic constraints. Based on the scientific literature findings and experts’ opinions, the authors identify a set of reference initial scenarios and the corresponding best treatments’ selection for configuring sewage sludge treatment plants. The scenario analysis reveals a useful reference technical framework when circular economy goals are pursued. The results achieved in all scenarios ensure the potential recovery of matter and/or energy from sewage sludges processes.

scholarly journals Application of nanoscale zero-valent iron in hexavalent chromium-contaminated soil: A review

2020 ◽  
Vol 9 (1) ◽  
pp. 736-750
Author(s):  
Xilu Chen ◽  
Xiaomin Li ◽  
Dandan Xu ◽  
Weichun Yang ◽  
Shaoyuan Bai
Keyword(s):  
Heavy Metal ◽  
Hexavalent Chromium ◽  
Contaminated Soil ◽  
Zero Valent Iron ◽  
Toxic Heavy Metal ◽  
Factors Affecting ◽  
Metal Pollutants ◽  
Nanoscale Zero Valent Iron ◽  
Low Toxicity ◽  
Heavy Metal Pollutants

AbstractChromium (Cr) is a common toxic heavy metal that is widely used in all kinds of industries, causing a series of environmental problems. Nanoscale zero- valent iron (nZVI) is considered to be an ideal remediation material for contaminated soil, especially for heavy metal pollutants. As a material of low toxicity and good activity, nZVI has been widely applied in the in situ remediation of soil hexavalent chromium (Cr(vi)) with mobility and toxicity in recent years. In this paper, some current technologies for the preparation of nZVI are summarized and the remediation mechanism of Cr(vi)-contaminated soil is proposed. Five classified modified nZVI materials are introduced and their remediation processes in Cr(vi)-contaminated soil are summarized. Key factors affecting the remediation of Cr(vi)-contaminated soil by nZVI are studied. Interaction mechanisms between nZVI-based materials and Cr(vi) are explored. This study provides a comprehensive review of the nZVI materials for the remediation of Cr(vi)-contaminated soil, which is conducive to reducing soil pollution.

Sign in / Sign up

Export Citation Format

Share Document