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Title: Pilot-scale treatment of gasification wastewater and reuse in a cooling tower

Abstract

The University of North Dakota Energy Research Center has operated a 910 kg/hr, oxygen-blown fixed-bed gasifier to produce lignite-derived effluents for characterization, treatment, and reuse studies. Reuse of waste water in a cooling tower was investigated to define environmental and process effects as a function of pretreatment. The gasification wastewater was pretreated in pilot wastewater treatement units which simulate available technology. During the first phase of the program, wastewater was pretreated by solvent extraction and steam stripping to produce phenol and ammonia concentrations comparable to those expected at the Great Plains Gasification Associates plant. This pretreated wastewater was concentrated in a cooling tower to 10 cycles of concentration. No biocides or corrosion inhibitors were added. Severe fouling of heat exchange surfaces and high corrosion rates of carbon steel were encountered. Over 90% of the phenol entering the cooling tower was found to be stripped into the cooling tower exhaust air stream. The high levels of organics remaining in this minimally treated wastewater suggested that further biological treatment and possibly polishing by carbon adsorption would be necessary to prepare a satisfactory feed. In the second phase of the program, the SGL was further treated in an activated sludge process followed bymore » granular activated carbon adsorption. Biotreatment removed 96% of the BOD with a three-day retention time while obtaining satisfactory sludge settling rates in spite of varied influent concentrations. Biorefractory materials were adsorbed on GAC to reach an effuent COD level of 150 mg/l. This upgrading was sufficient to reduce organic emissions from the cooling tower, but corrosion rates were higher than in the previous test, again showing the necessity for corrosion inhibitors. 8 figs., 3 tabs.« less

Authors:
; ; ;
Publication Date:
Research Org.:
North Dakota Univ., Grand Forks (USA). Energy Research Center; Radian Corp., Austin, TX (USA)
OSTI Identifier:
5746070
Report Number(s):
DOE/FE/60181-74; CONF-850463-1
ON: DE85010900
DOE Contract Number:  
FC21-83FE60181
Resource Type:
Conference
Resource Relation:
Conference: 11. Australian Water and Wastewater Association international convention, Melbourne, Victoria, Australia, 28 Apr 1985
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; AMMONIA; REMOVAL; COAL GASIFICATION; WASTE WATER; PHENOLS; RECYCLING; WATER TREATMENT; CHEMICAL COMPOSITION; COOLING TOWERS; CORROSION; LIGNITE; PILOT PLANTS; AROMATICS; BROWN COAL; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; COAL; ENERGY SOURCES; FOSSIL FUELS; FUELS; FUNCTIONAL MODELS; GASIFICATION; HYDRIDES; HYDROGEN COMPOUNDS; HYDROXY COMPOUNDS; LIQUID WASTES; MATERIALS; MECHANICAL STRUCTURES; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; THERMOCHEMICAL PROCESSES; TOWERS; WASTES; WATER; 010404* - Coal, Lignite, & Peat- Gasification; 010800 - Coal, Lignite, & Peat- Waste Management

Citation Formats

Willson, W G, Mayer, G G, Hendrikson, J G, and Winton, S L. Pilot-scale treatment of gasification wastewater and reuse in a cooling tower. United States: N. p., 1985. Web.
Willson, W G, Mayer, G G, Hendrikson, J G, & Winton, S L. Pilot-scale treatment of gasification wastewater and reuse in a cooling tower. United States.
Willson, W G, Mayer, G G, Hendrikson, J G, and Winton, S L. Mon . "Pilot-scale treatment of gasification wastewater and reuse in a cooling tower". United States.
@article{osti_5746070,
title = {Pilot-scale treatment of gasification wastewater and reuse in a cooling tower},
author = {Willson, W G and Mayer, G G and Hendrikson, J G and Winton, S L},
abstractNote = {The University of North Dakota Energy Research Center has operated a 910 kg/hr, oxygen-blown fixed-bed gasifier to produce lignite-derived effluents for characterization, treatment, and reuse studies. Reuse of waste water in a cooling tower was investigated to define environmental and process effects as a function of pretreatment. The gasification wastewater was pretreated in pilot wastewater treatement units which simulate available technology. During the first phase of the program, wastewater was pretreated by solvent extraction and steam stripping to produce phenol and ammonia concentrations comparable to those expected at the Great Plains Gasification Associates plant. This pretreated wastewater was concentrated in a cooling tower to 10 cycles of concentration. No biocides or corrosion inhibitors were added. Severe fouling of heat exchange surfaces and high corrosion rates of carbon steel were encountered. Over 90% of the phenol entering the cooling tower was found to be stripped into the cooling tower exhaust air stream. The high levels of organics remaining in this minimally treated wastewater suggested that further biological treatment and possibly polishing by carbon adsorption would be necessary to prepare a satisfactory feed. In the second phase of the program, the SGL was further treated in an activated sludge process followed by granular activated carbon adsorption. Biotreatment removed 96% of the BOD with a three-day retention time while obtaining satisfactory sludge settling rates in spite of varied influent concentrations. Biorefractory materials were adsorbed on GAC to reach an effuent COD level of 150 mg/l. This upgrading was sufficient to reduce organic emissions from the cooling tower, but corrosion rates were higher than in the previous test, again showing the necessity for corrosion inhibitors. 8 figs., 3 tabs.},
doi = {},
url = {https://www.osti.gov/biblio/5746070}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {4}
}

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