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| Number | Title | Issue Date |
| 5679262 | Method for alkaline treatment of sewage sludge for beneficial use An alkaline stabilization process for treating partially dewatered sludge while reducing lime consumption, increasing nutrient values and applicability of the product, and enhancing physical handling characteristics such as dryness, granularity and spread... | 10/21/1997 |
| 5435923 | Method for the treatment of sewage sludge and the like A process for the production of a durable granular or pelletized sludge product is disclosed whereby a minimal amount of high calcium oxide material is utilized for pathogenic stabilization, a portion of the resulting hot mixture being recycled back to th... | 07/25/1995 |
| 5259977 | Method and apparatus for the treatment of sewage sludge and the like A process for the production of a durable granular or pelletized sludge product is disclosed whereby a minimal amount of high calcium oxide material is utilized for pathogenic stabilization, the resulting material being further processed through an agglom... | 11/09/1993 |
| 5215670 | Process of drying and pelletizing sludge in indirect dryer having recycled sweep air Dewatered municipal sludge is dried and simultaneously pelletized in an indirect dryer. A sweep air is introduced into the dryer to extract a water vapor and air mixture. The water vapor and air mixture is condensed and cleaned in a condensor and a scrubb... | 06/01/1993 |
| 4872998 | Apparatus and process for forming uniform, pelletizable sludge product An automated, non-polluting process and apparatus for mechanically dewatering and heat drying liquid sewage sludge of widely varying solids content to form a pelletizable, dried sludge of predetermined uniform solids content without requiring recycling of... | 10/10/1989 |
