Experimental Study on Supercritical Water Oxidation of Paper Mill Sludge

2014 ◽  
Vol 955-959 ◽  
pp. 711-715 ◽  
Author(s):  
Li Li Qian ◽  
Shu Zhong Wang ◽  
Jie Zhang
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Paper Industry ◽  
Paper Mill ◽  
National Standards ◽  
Supercritical Water Oxidation ◽  
Paper Mill Sludge ◽  
Temperature Oxidation ◽  
Liquid Products ◽  
Transparent Liquid

Paper industry produces large amounts of sludge with about 65wt% moisture content. Due to its complex composition, the charge of traditional disposal method is high and easy to bring about secondary pollution. In this paper, the influences of temperature, oxidation coefficient and residence time on the performance of supercritical water oxidation (SCWO) of paper mill sludge were investigated. The results show that SCWO can almost completely eliminate organics in sludge and obtain transparent liquid products meeting relative national standards at 550°C, 5min with an oxidation coefficient of 3.0. However, during this process, TN changes to NH3-N, so NH3-N in liquid products increases with operation parameters, indicating the recalcitrant nature of NH3-N, and which needs further treatment.

Low-temperature oxidation of SiC surfaces by supercritical water oxidation

2010 ◽  
Vol 256 (22) ◽  
pp. 6512-6517 ◽  
Author(s):  
Takashi Futatsuki ◽  
Taro Oe ◽  
Hidemitsu Aoki ◽  
Naoyoshi Komatsu ◽  
Chiharu Kimura ◽  
...  
Keyword(s):  
Low Temperature ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation

Supercritical water oxidation of sludges contaminated with toxic organic chemicals

2000 ◽  
Vol 42 (7-8) ◽  
pp. 363-368 ◽  
Author(s):  
N. Crain ◽  
A. Shanableh ◽  
E. Gloyna
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Paper Mill ◽  
Pilot Scale ◽  
Supercritical Water Oxidation ◽  
Pulp And Paper Mill ◽  
Remediation Technology ◽  
University Of Texas ◽  
The University ◽  
Hazardous Compounds

Supercritical water oxidation (SCWO) is a proven technology for the treatment of contaminated organic wastes. Bench and pilot-scale work completed at The University of Texas at Austin's SCWO Laboratory have proven the technology effective for treating a variety of sludge types, including sludge contaminated with hazardous compounds. The studies included pulp and paper mill sludges and sludges derived from the treatment of municipal and industrial wastewaters. The results presented in this paper confirmed that the removal of the organic component of sludge, including the trace toxic organic compounds, using SCWO exceeded 99.9%. For example, the results show that the destruction removal efficiencies (DRE's) of the PCBs reached 99.99% in the contaminated sludge. No dioxins or furans were detected in the gaseous effluent resulting from the treatment of the PCB-contaminated sludge. These results demonstrate the technical effectiveness of SCWO as a sludge remediation technology.

Sulfur Transformations during Supercritical Water Oxidation of Methanthiol and Thiirane

2012 ◽  
Vol 610-613 ◽  
pp. 1377-1380 ◽  
Author(s):  
Hong He Ma ◽  
Shu Zhong Wang ◽  
Lu Zhou
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Conversion Rate ◽  
Flow Reactor ◽  
Stoichiometric Ratio ◽  
Supercritical Water Oxidation ◽  
Liquid Products ◽  
Tubular Flow Reactor ◽  
Tubular Flow ◽  
Sulfur Containing

The oxidation of methanthiol and thiirane in supercritical water was explored by using a tubular-flow reactor system using oxygen as oxidant. No sulfur containing species existed in the gaseous effluent. Sulfide, sulfite and sulfate were detected as the sulfur containing species in the liquid effluent for supercritical water oxidation (SCWO) of methannthiol, while it was determined as thiosulfate, sulfite and sulfate for SCWO of thiirane. When reaction temperature exceeded 873K, the sulfur contained in the methanthiol or thiirane all transformed into the liquid products. Oxidant stoichiometric ratio had little effect on the conversion rate of sulfur but could promoted sulfite converted into sulfate. Sulfide and thiosulfate were determined as the exclusive sulfur containing product arising directly from methanthiol and thiirane, respectively. The transformation pathways of sulfur contained in the methanthiol and thiirane were proposed as methanthiol-sulfide-sulfite-sulfate and thiirane-thiosulfate-sulfite-sulfate, respectively.

Kinetics of Supercritical Water Oxidation. SERDP Compliance Technical Thrust Area

1996 ◽  
Author(s):  
Steven F. Rice ◽  
Richard R. Steeper ◽  
Russell G. Hanush ◽  
Jason D. Aiken ◽  
Eric Croiset
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Kinetics Of

Kinetics of Supercritical Water Oxidation

1995 ◽  
Author(s):  
Steven F. Rice ◽  
Jefferson W. Tester ◽  
Kenneth Brezinsky
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Kinetics Of

Kinetics of Supercritical Water Oxidation

1995 ◽  
Author(s):  
Steven F. Rice ◽  
Jefferson W. Tester ◽  
Kenneth Brezinsky
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Kinetics Of
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