OCR Text |
Show test is shown in Figure 2. In the seven day test program, over 19 tons of the sewage sludge were gasified along with 55 tons of coal. The carbon conversion demonstrated in this gasification test was 99.9% An analysis of the primary components in the product gas is listed in Table II. A contracted third party laboratory conducted environmental monitoring of product gas, aqueous effluent and slag streams throughout the test run. This monitoring included all permit parameters required by the regulatory agencies. In addition to the required environmental data, monitoring was conducted for priority pollutants and dioxins and furans. No priority pollutants were detected. These parameters are known to be of concern in sewage sludge incineration. The California Air Resource Board method was used for analysis of dioxins and furans. The extensive use of field and reagent blanks is a critical part of the method, which is capable of detecting dioxins and furans in the parts per quadrillion range. Application of this method to the sewage sludge gasification test for the Cool Water project resulted in no dioxins or furans detected above blank levels. A summary of the results of the environmental monitoring from the Cool Water gasification test is shown in Table III. OTHER WASTE GASIFICATION In addition to the sewage sludge test programs being conducted for design and permitting of commercial plants, Texaco is involved in the gasification of a variety of other waste streams. Under a program with the California Department of Health Services (DHS) , Texaco has performed feasibility studies of a number of liquid and solid wastes. Under a grant from the DHS, Texaco demonstrated the gasification of petroleum production tank bottoms. This low heating value waste, consisting of an emulsion of crude oil, water and soil was efficiently converted to synthesis gas and nonhazardous slag. Texaco has scheduled a pilot plant gasification program to demonstrate the gasification of contaminated soils. In this program, topsoil contaminated with vacuum gas oil will be gasified along with an eastern coal. Texaco is also initiating test programs for the gasification of industrial wastes. Such programs will allow industry to use gasification to recycle their in-plant waste streams and produce either chemical feedstocks or electrical power. - 4 - |