New Design of Supercritical Water Oxidation Reactor for Sewage Sludge Treatment

2013 ◽  
Vol 774-776 ◽  
pp. 212-215 ◽  
Author(s):  
Shu Yang ◽  
Guang Wei Wang ◽  
Yuan Jian Xu
Keyword(s):  
Sewage Sludge ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Supercritical Water Oxidation ◽  
Reactor Performance ◽  
Inner Surface ◽  
Oxidation Reactor

The corrosion of reactor and salt precipitation are two critical obstacles that inhibiting the development of supercritical water oxidation (SCWO) in to a viable industrial process. A new design of double wall reactor has been developed in which SCWO reaction take place inside an inner tube (alumina or titanium, micro porous). The high pressure air layer between inner surface of reactor and surface of tube could prevent non-soluble materials, corrosion ingredients and inorganic salt depositing and attaching to inner surface, thus critical problems have been overcome. The new reactor performance was evaluated by processing sewage sludge from BeiBei waste water treatment plant. There were no salt plugging or corrosion observed in reactor after one month operation.

scholarly journals Analysis of the Energy Flow in a Municipal Wastewater Treatment Plant Based on a Supercritical Water Oxidation Reactor Coupled to a Gas Turbine

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1237
Author(s):  
Fidel A. Mato ◽  
Mar Peña ◽  
Yoana García-Rodríguez ◽  
María-Dolores Bermejo ◽  
Ángel Martín
Keyword(s):  
Gas Turbine ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Municipal Wastewater ◽  
Energy Content ◽  
Treatment Plant ◽  
Supercritical Water Oxidation ◽  
Treatment Unit ◽  
Oxidation Reactor ◽  
Sludge Production

Biological municipal wastewater treatments lead to high sludge generation and long retention times, and the possibilities for recovery of the energy content of the input waste stream are very limited due to the low operating temperature. As an alternative, we propose a sequence of exclusively physicochemical, non-biological stages that avoid sludge production, while producing high-grade energy outflows favoring recovery, all in shorter times. Ultrafiltration and evaporation units provide a front-end concentration block, while a supercritical water oxidation reactor serves as the main treatment unit. A new approach for energy recovery from the effluent of the reactor is proposed, based on its injection in a gas turbine, which presents advantages over simpler direct utilization methods from operational and efficiency points of view. A process layout and a numerical simulation to assess this proposal have been developed. Results show that the model process, characterized with proven operating parameters, found a range of feasible solutions to the treatment problem with similar energy costs, at a fast speed, without sludge production, while co-generating the municipality’s average electricity consumption.

Design of a Small-Scale Supercritical Water Oxidation Reactor. Part II: Numerical Modeling

2021 ◽  
Author(s):  
Anmol L. Purohit ◽  
John A. Misquith ◽  
Brian R. Pinkard ◽  
Stuart J. Moore ◽  
John C. Kramlich ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Small Scale ◽  
Supercritical Water Oxidation ◽  
Oxidation Reactor

Application of Thermally Treated Sewage Sludge in Blended Cements

2014 ◽  
Vol 905 ◽  
pp. 191-194 ◽  
Author(s):  
Zbyšek Pavlík ◽  
Milena Pavlíková ◽  
Jan Fořt ◽  
Martina Záleská ◽  
Igor Medveď ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Diffraction Method ◽  
High Strength ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Partial Replacement ◽  
Blended Cements ◽  
Thermally Treated

Chemical, physical, morphological, and mineralogical analysis of sewage sludge originating from a waste water treatment plant in Patras, Greece, is presented in the paper. The sewage sludge is firstly dried at 70°C, then oven-burned at 700°C for two hours and milled. The thermally treated material is analyzed using XRF and XRD, the particle size distribution is determined by a laser diffraction method. A potential use of sewage sludge in blended cements is investigated on the basis of the measurement of mechanical and basic physical properties of pastes containing the sludge in an amount of up to 60% of the mass of cement. Experimental results show that the thermal treatment of pre-dried sewage sludge and its grinding provides a material that can be successfully applied as a partial replacement of Portland cement. At a production of blended cements for high strength concrete, an up to 20% cement replacement level can be recommended.

Numerical modelling of a supercritical water oxidation reactor containing a hydrothermal flame

2008 ◽  
Vol 46 (2) ◽  
pp. 149-155 ◽  
Author(s):  
C. Narayanan ◽  
C. Frouzakis ◽  
K. Boulouchos ◽  
K. Príkopský ◽  
B. Wellig ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Oxidation Reactor

Supercritical Water Oxidation – Wastewaters and Sludges

1991 ◽  
Vol 23 (1-3) ◽  
pp. 389-398 ◽  
Author(s):  
Abdullah Shanableh ◽  
Earnest F. Gloyna
Keyword(s):  
Acetic Acid ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Transformation Products ◽  
Pilot Scale ◽  
Supercritical Water Oxidation ◽  
Temperature And Pressure ◽  
Dimethyl Phenol

Environmental contaminants can be eliminated through the use of SCWO techniques. A comprehensive supercritical oxidation (SCWO) research laboratory, including bench and pilot-scale facilities has been developed. High temperature and pressure systems slightly less than and greater than supercritical water conditions can be used for the efficient destruction of waste biological treatment plant sludges, acetic acid, 2-nitro phenol, 2,4-dimethyl phenol, phenol, and 2,4-dinitro toluene. Above 400 °C, near complete destruction of sludge and transformation compounds such as acetic acid can be achieved with relatively short residence times. Ammonia and acetic acid are transformation products in the SCWO of biological treatment plant sludges. Acetic acid produced from the oxidation of sludge is oxidized rapidly at supercritical temperatures, 400 °C to 450 °C.

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