Abstract: A process for treating sewage sludge having a predetermined water content to produce a soil conditioner, comprising (a) transporting the sludge aboard a vehicle; and (b) heating the sludge during the transporting step (a) to a temperature and for a time sufficient to pasteurize the sludge without substantially reducing the water content of the sludge. The treatment is conducted aboard any suitable vehicle, such as a ship, railroad car or truck. The heat required to pasteurize the sludge may be obtained from the vehicle's engine waste heat and/or an auxiliary heat source. The sludge is pasteurized during the vehicle's transit from one destination to another and thereby eliminates the requirement of performing a separate pasteurization process before the sludge has been loaded on the vehicle or after it has been unloaded from the vehicle. The present invention protects the public health and saves both time and money as compared with conventional processes of the prior art.