Reduction of chemical oxygen demand of industrial wastes using subcritical water oxidation
- Yuan-Ze Inst. of Technology, Taoyuan (Taiwan, Province of China)
If wastes have strong toxicity, high organic content, and a deep hue, they are difficult to handle in the waste disposal. It is very practical that waste of this kind is treated by Subcritical Water Oxidation (SWO). In our work, caprolactum (CPL) waste, purged from a petrochemical plant, and dyeing waste, purged from a textile plant, were individually treated by a semi-batch SWO process. Within a one-hour treatment, Chemical Oxygen Demand (COD) reduction reached 89% for CPL waste (6.90 MPa, 260[degree]C) and 95% for dyeing waste (6.90 MPa, 240[degree]C). There is also a great improvement in hue, especially for the dyeing waste. When CPL wastewater was treated by the SWO process using a chromium metal powder as a catalyst, COD reduction improved further under the same operating conditions. A kinetic model was used to illustrate the oxidation mechanism and the effectiveness of the catalyst. The oxygen concentration in the effluent showed that oxygen consumption corresponded to COD reduction. With the monitoring of concentrations of total soluble chromium in the effluent, a suitable reaction period could be found in order to meet the standard of the Environmental Protection Agency (EPA). 12 refs., 11 figs., 2 tabs.
- OSTI ID:
- 5664637
- Journal Information:
- Journal of Environmental Science and Health, Part A: Environmental Science and Engineering; (United States), Vol. 27:7; ISSN 0360-1226
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
INDUSTRIAL WASTES
OXIDATION
PETROCHEMICAL PLANTS
WASTE PROCESSING
TEXTILE INDUSTRY
ABSORPTION SPECTROSCOPY
CATALYSIS
CHEMICAL OXYGEN DEMAND
CHROMIUM
DYES
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
OXYGEN
REACTION KINETICS
WASTE WATER
WATER
CHEMICAL PLANTS
CHEMICAL REACTIONS
CHROMATOGRAPHY
DATA
ELEMENTS
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
INDUSTRY
INFORMATION
KINETICS
LIQUID WASTES
MANAGEMENT
METALS
NONMETALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PROCESSING
SEPARATION PROCESSES
SPECTROSCOPY
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTES
020800* - Petroleum- Waste Management
400201 - Chemical & Physicochemical Properties
400102 - Chemical & Spectral Procedures