This report describes the technical progress made during the fourth quarter on a study sponsored by the Department of Energy entitled Pollution Control in Coal Gasification. The objectives of this study are to evaluate in detail the potential of: (a) vapor phase cracking (VPC,5727 ); and (b) wet oxidation (WO) of simulated and actual coal gasifier effluent streams as a means of reducing the concentration of organics in these streams. Seven vapor phase cracking tests and 14 wet oxidation tests were carried out during this quarter. During the first three quarters, a high-pressure and high-temperature gas and liquid delivery system and a reactor system consisting of three parallel reactors (two tubular reactors and a Berty reactor) were constructed. In addition, two iron oxide catalysts and two coal-derived materials (from a subbituminous coal and a lignite) were evaluated for their potential for use as VPC catalysts. During this quarter, a total of seven experiments were carried out for evaluation of three additional commercial catalysts. In this quarter, five WO tests were conducted that concluded the first phase of study, the screening of catalysts. The second phase of the study, the testing of actual gasifier wastewater, was begun and nine additional tests were conducted making a total of 14 wet oxidation tests this quarter. 4 references, 11 figures, 8 tables.