scholarly journals Nitrogen source recovery from mature leachate via heat extraction technology: An engineering project application

2022 ◽  
Author(s):  
Jianying Xiong ◽  
Chen Zhang ◽  
Pinjing He ◽  
Jun He ◽  
Xiaodong Dai ◽  
...  
Keyword(s):  
Cost Effective ◽  
Heat Extraction ◽  
Extraction System ◽  
Extraction Technology ◽  
Leachate Treatment ◽  
Engineering Project ◽  
Treated Effluent ◽  
Ammonia Recovery ◽  
Municipal Solid Waste Landfills ◽  
Operation Results

Abstract Large pool of ammonia in mature leachate is challenging to treat with a membrane bioreactor system to meet the discharge standard for pollution control of municipal solid waste landfills in China (GB 16889-2008) without external carbon source addition. In this study, an engineering leachate treatment project with a scale of 2,000 m3/d was operated to evaluate the ammonia heat extraction system (AHES), which contains preheat, decomposition, steam-stripping, ammonia recovery, and centrifuge dewatering. The operation results showed that NH3-N concentrations of raw leachate and treated effluent from an ammonia heat extraction system (AHES) were 1,305–2,485 mg/L and 207–541 mg/L, respectively. The ratio of COD/NH3-N increased from 1.40–1.84 to 7.69–28.00. Nitrogen was recovered in the form of NH4HCO3 by the ammonia recovery tower with the introduction of CO2, wherein, the mature leachate can offer 37% CO2 consumption. The unit consumptions of steam and power were 8.0% and 2.66 kWh/m3 respectively, and the total operation cost of AHES was 2.06 USD per cubic leachate. These results confirm that the heat extraction is an efficient and cost-effective technology for the recovery of nitrogen resource from mature leachate.

scholarly journals The green bulkhead: a vertical wetland design for urban harbors

2021 ◽  
Vol 8 (3) ◽  
pp. 76-79
Author(s):  
Peter I May ◽  
Matthew Lagomarsino ◽  
Patrick Kangas
Keyword(s):  
Water Quality Management ◽  
Ecological Engineering ◽  
Cost Effective ◽  
Urban Setting ◽  
Washington Dc ◽  
Treatment Wetland ◽  
Management Options ◽  
Engineering Project ◽  
Vertical Orientation ◽  
The Matrix

In urban harbors there is a reliance on the “gray infrastructure” of armored bulkheads along shorelines. While this form of shoreline technology provides stability and eliminates erosion, it limits shoreline biodiversity and lacks aesthetic value. In this paper, a living shoreline concept, termed the Green Bulkhead, is described and demonstrated. This is a kind of artificial vertical wetland with plants grown in a porous plastic fabric that is draped over the surface of an existing bulkhead. The system is irrigated with water that is pumped from the harbor. Several alternate designs have been tested for different medium types, planting patterns and water pumping regimes. It is proposed that the green bulkhead system can provide limited treatment wetland services in an urban setting where cost-effective water quality management options are minimal. Testing found that high percentages of sediment were retained within the matrix of the different media. The system has aesthetic benefits by “greening” the harbor environment with wetland plants and, because of its vertical orientation, it can be managed adaptively for sea level rise. This work is a report of an on-going ecological engineering project with demonstrations along the Baltimore, Maryland Inner Harbor and the Anacostia Waterfront in Washington, DC.

Transient Analysis of Heated Vapor Extraction System for Effective Remediation

2003 ◽  
Author(s):  
R. S. Jadhav ◽  
R. S. Amano ◽  
J. Jatkar ◽  
R. J. Lind
Keyword(s):  
Research Effort ◽  
Cost Effective ◽  
Extraction System ◽  
Vapor Extraction ◽  
Discrete Phase Modeling ◽  
Discrete Phase ◽  
Chemical Companies ◽  
Time Required ◽  
Volume Method ◽  
Remediation Process

A soil remediation process has gained an enormous attention for the last decade in order to make the surroundings environmentally friendly. The areas around chemical companies or waste disposal sites have been seriously contaminated from the chemicals and other polluting materials that are disposed off. Different soil remedial processes are used for different types of pollutants. The present research effort is concentrated on modeling the Heated Vapor Extraction System, which is a very efficient and cost effective process. A numerical model is developed and Finite Volume Method is used to solve the model. The analysis uses the species transport and discrete phase modeling to predict the time required to clean the soil under specific conditions. The analysis was used as a mathematical computational tool to predict various parameters for the process so that the process can be made more efficient and effective in remedial achievements.

Concept of Triple Heat Exchanger-Assisted Solar Pond Through an Improved Analytical Model

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Sunirmit Verma ◽  
Ranjan Das
Keyword(s):  
Analytical Model ◽  
Power Output ◽  
Heat Exchangers ◽  
Thermal Power ◽  
Convective Zone ◽  
Heat Extraction ◽  
Extraction System ◽  
Seepage Water ◽  
Solar Pond ◽  
Bottom Zone

A new three-zone heat extraction system and its analytical model for maximizing the thermal power output of salt gradient solar ponds against a given volume is proposed. The present study considers internal heat exchangers installed within the non-convective zone (NCZ), lower-convective zone (LCZ), and the ground below the pond. The work is validated against a simplified version of the model (eliminating ground and bottom-zone heat extractions) available in the existing literature. Contrary to the conventional practice of optimizing only the middle-zone pond thickness, here, the newly proposed expression is used to find ideal values of both the middle- and bottom-zone thicknesses of the pond along with its cross-sectional area. The present work acknowledges that although the three-zone heat extraction system is the best, yet if a choice for two-zone heat extraction is to be made between the NCZ–LCZ and ground–LCZ, then the former is a better alternative. The power output is observed to increase asymptotically with mass flow rates of the three heat exchangers. However, their values must lie much below their theoretical asymptotic limits and their selection is regulated by constructional and operational constraints. These involve a minimum pond depth to offset surface evaporation, ground seepage water loss, and constraints preventing turbulent flow in heat exchangers to reduce friction loss and pumping power. This work recommends using three heat exchangers instead of either one or two and provides cardinal guidelines to extract heat in an ideal manner for a fixed solar pond volume.

Design and Implementation of Web Extraction System of Ceramic Products’ Information in the Business Website

2014 ◽  
Vol 989-994 ◽  
pp. 4322-4325
Author(s):  
Mu Qing Zhan ◽  
Rong Hua Lu
Keyword(s):  
Information Extraction ◽  
Search Engine ◽  
Extraction System ◽  
The Internet ◽  
Extraction Technology ◽  
Web Information Extraction ◽  
Design And Implementation ◽  
Web Extraction ◽  
Web Information ◽  
The Web

In the means of getting information from the Internet, the Web information extraction technology which can get more precise and more granular information is different from Search Engine, this article presents the technical route of Web information exaction of ceramic products’ information on the basis of analyzing the developing status of Web information extraction technology at home and abroad, and makes the extraction rules, and develops a set of extraction system, and acquires the relevant ceramic products’ information.

Cost-effective pre-treatment of wastewater

1999 ◽  
Vol 39 (5) ◽  
pp. 97-103
Author(s):  
Fatma A. El-Gohary ◽  
Fayza A. Nasr
Keyword(s):  
Wastewater Treatment ◽  
Domestic Wastewater ◽  
Cost Effective ◽  
Upflow Anaerobic Sludge Blanket ◽  
Mitigation Measures ◽  
Anaerobic Sludge ◽  
Two Stage ◽  
One Stage ◽  
Treated Effluent ◽  
Pre Treatment

The implementation of low-cost, simple mitigation measures is required for the timely control and sustainable management of pollution problems in developing countries. Recently, the use of anaerobic systems for wastewater treatment has received a growing attention since they represent an alternative cost-effective approach for removal of pollutants. Therefore, evaluation of the performance of an Upflow Anaerobic Sludge Blanket Reactor, as a pre-treatment step for industrial as well as domestic wastewater was the subject of this study. The results obtained showed that the performance of one-stage UASB at 8hrs hydraulic retention time (HRT) for domestic wastewater treatment was quite satisfactory. CODtot and BODtot removal values averaged 77% and 83%. Comparison of the performance of a one-stage versus two-stage reactor, having the same volume and operated at the same HRT (8 hr) and biomass concentration indicated an improvement in the quality of the two-stage effluent. With regard to the wastewater discharged from a potato-chips factory, the use of one-stage UASB at a detention time of 18hrs and an average organic load of 2.9 kg BOD/m3/d gave good results. Average residual values of COD, BOD, TSS and oil and grease in the treated effluent were 650, 342, 203 and 63 mg/l, respectively. Operation of a two-stage pilot-scale UASB indicated better performance as expressed by COD and BOD removal values.

An internal heat extraction system for solar ponds

Solar Energy ◽  
1985 ◽  
Vol 34 (4-5) ◽  
pp. 297-302 ◽  
Author(s):  
F. Sabetta ◽  
M. Pacetti ◽  
P. Principi
Keyword(s):  
Internal Heat ◽  
Heat Extraction ◽  
Extraction System ◽  
Solar Ponds

Electrophoretic Deposition of Carbon Nanotubes on Metallic Surfaces

2006 ◽  
Vol 314 ◽  
pp. 141-146 ◽  
Author(s):  
B.J.C. Thomas ◽  
M.S.P. Shaffer ◽  
Sarah Freeman ◽  
M. Koopman ◽  
Krish K. Chawla ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrophoretic Deposition ◽  
Cost Effective ◽  
Heat Extraction ◽  
Metallic Surfaces ◽  
Tissue Engineering Scaffolds ◽  
Homogeneous Microstructure ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Steel Substrates

A method based on electrophoretic deposition has been developed to produce uniform deposits of multi-walled carbon nanotubes on stainless steel substrates. Aqueous suspensions were used under constant voltage conditions in the range of 5 to 50 V, with deposition times ranging from 0.5 to 10 minutes. The thickness of the coatings was controlled by variation of voltage and deposition time during EPD. Coatings of up to 100μm thickness were achieved, which exhibit homogeneous microstructure. The EPD technique is fast, cost-effective, and it can be applied to complex shapes. Possible applications of CNT coatings are in heat extraction devices or porous nanostructured coatings for tissue engineering scaffolds.

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