SUPERCRITICAL WATER GASIFICATION AS A TREATMENT FOR LABORATORY ORGANIC WASTE

The thermodynamics of supercritical water gasification (SCWG) was studied in order to determine its potential for treatment of laboratory liquid organic waste. A thermodynamic model based on the minimization of Gibbs energy was developed in Aspen Plus software that simulated the SCWG of liquid lab organic wastes on an ash free basis. The feed stream contained a mixture of aliphatic (hexane), oxygenated (acetone, ethyl acetate,ethyl ether, isopropyl alcohol and methanol), aromatic (toluene and xylene) and chlorinated hydrocarbons (chloroform and dichloromethane). The showed that a pressure of 25 MPa, low organic material concentration of 5-10% in the feed and temperatures over 600oC, SCWG resulted in hydrogen rich syngas aith a trace amount of HCI in the liquid effluent. High conversion rates were obtained for oxygenated hydrocarbons having destruction and removal efficiency (DRE) greater than 99.99% with the rest of the compound having a 100% DRE. The composition of the gaseous stream was found to be such that the gas could be released safely to the atmosphere or be stored at high pressure. The study established a proof of concept that there is potential for laboratories to use this method to deal with organic lab wastes with the SCWG process effluent that is environmental friendly.

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Supercritical water gasification of isopropyl alcohol on vertical continuous apparatus: process conditions

Paliva ◽

10.35933/paliva.2016.04.01 ◽

2016 ◽

pp. 126 ◽

Cited By ~ 1

Author(s):

Eliška Purkarová

Keyword(s):

Supercritical Water ◽

Isopropyl Alcohol ◽

Process Conditions ◽

Supercritical Water Gasification

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Supercritical water gasification of food waste: Effect of parameters on hydrogen production

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2020.03.190 ◽

2020 ◽

Vol 45 (29) ◽

pp. 14744-14755 ◽

Cited By ~ 3

Author(s):

Wei Su ◽

Changqing Cai ◽

Ping Liu ◽

Wei Lin ◽

Baorui Liang ◽

...

Keyword(s):

Hydrogen Production ◽

Food Waste ◽

Supercritical Water ◽

Supercritical Water Gasification

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Graphene-supported metal nanoparticles as novel catalysts for syngas production using supercritical water gasification of microalgae

Biomass and Bioenergy ◽

10.1016/j.biombioe.2018.11.035 ◽

2019 ◽

Vol 121 ◽

pp. 13-21 ◽

Cited By ~ 6

Author(s):

Roudabeh Samiee-Zafarghandi ◽

Alireza Hadi ◽

Javad Karimi-Sabet

Keyword(s):

Metal Nanoparticles ◽

Supercritical Water ◽

Syngas Production ◽

Supercritical Water Gasification ◽

Supported Metal Nanoparticles ◽

Supported Metal

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Supercritical water gasification (SCWG) as a potential tool for the valorization of phycoremediation-derived waste algal biomass for biofuel generation

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2021.126278 ◽

2021 ◽

pp. 126278

Author(s):

Yoong Kit Leong ◽

Wei-Hsin Chen ◽

Duu-Jong Lee ◽

Jo-Shu Chang

Keyword(s):

Supercritical Water ◽

Algal Biomass ◽

Supercritical Water Gasification ◽

Potential Tool

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Gasification of Biomass in Supercritical Water, Challenges for the Process Design—Lessons Learned from the Operation Experience of the First Dedicated Pilot Plant

Processes ◽

10.3390/pr9030455 ◽

2021 ◽

Vol 9 (3) ◽

pp. 455

Author(s):

Nikolaos Boukis ◽

I. Katharina Stoll

Keyword(s):

Organic Matter ◽

Supercritical Water ◽

Process Design ◽

Pilot Plant ◽

Lessons Learned ◽

Present Contribution ◽

Flow Process ◽

Combustible Gas ◽

Supercritical Water Gasification ◽

Robust Process

Gasification of organic matter under the conditions of supercritical water (T > 374 °C, p > 221 bar) is an allothermal, continuous flow process suitable to convert materials with high moisture content (<20 wt.% dry matter) into a combustible gas. The gasification of organic matter with water as a solvent offers several benefits, particularly the omission of an energy-intensive drying process. The reactions are fast, and mean residence times inside the reactor are consequently low (less than 5 min). However, there are still various challenges to be met. The combination of high temperature and pressure and the low concentration of organic matter require a robust process design. Additionally, the low value of the feed and the product predestinate the process for decentralized applications, which is a challenge for the economics of an application. The present contribution summarizes the experience gained during more than 10 years of operation of the first dedicated pilot plant for supercritical water gasification of biomass. The emphasis lies on highlighting the challenges in process design. In addition to some fundamental results gained from comparable laboratory plants, selected experimental results of the pilot plant “VERENA” (acronym for the German expression “experimental facility for the energetic exploitation of agricultural matter”) are presented.

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