A Preliminary Investigation of Physical-Chemical Treatment of Slagging Gasifier Aqueous Effluent

<p>The feasibility of treating slagging gasifier wastewater by physical-chemical means was studied. Pretreatment and treatment flow schemes were developed by using batch and continuous tests. Results were based mainly on wastewater residual total organic carbon (TOC). A treatment facility was designed and economically evaluated.</p> <p>It was found that slagging gasifier wastewater is treatable by physical-chemical means using activated carbon and chemical oxidation as the two principal treatment steps. A pretreatment scheme consisting of lime addition, ammonia stripping, and recarbonation-coagu- lation was found to sufficiently purify the raw gasifier liquor so that activated carbon adsorption and chemical oxidation could be applied as secondary and tertiary treatment.</p> <p>Oxidants found to be ineffective were: chlorine, sodium hypochlorite, hydrogen peroxide, and potassium permanganate. Ozone and bromine chloride were determined to be capable of oxidizing gasifier wastewater although bromine chloride oxidation seems to be more economical.</p> <p>LCK activated carbon, manufactured by Union Carbide, proved to be the preferred granular carbon for slagging gasifier liquor treatment.</p> <p>A total capital investment of approximately 14,748,000 can be expected for a facility capable of purifying pretreated wastewater produced from a slagging gasification plant having a large enough3 gas output to produce 250 million standard ft³/day of methane. Annual operating costs are estimated to be 7,413,000, i.e., $10.75 per 1000 gallons of pretreated liquor.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Chemical Engineering

Year

1979

Author dc:creator

• Hird, Kirk B.

• Chemical Engineering

Repository record dc:identifier

https://commons.und.edu/theses/523

OAI identifier oai:identifier

oai:commons.und.edu:theses-1522