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 Method for treatment of waste water sludge

Details
Inventors: Kew, S. Alan; Kritzer, Robert M.; Soule, Bruce E.;
Assignee: Kinetic Dispersion Corporation (Scarborough, ME)
Primary Examiner: Dawson; Robert A.
Assistant Examiner: Reifsnyder; David
Attorney, Agent or Firm: Selitto, Jr.; Ralph W.

A method for treating liquid waste water sludge after its generation and separation from the waste liquid involves forcibly impacting sludge particles and microbial cells against a contact surface to thereby fragment the particles into smaller-sized particles and break apart the organic cells. As a result of such a fragmentation process, water located in the pores of the sludge particles is released, thereby enhancing a subsequent dewatering process performed on the sludge. The destruction of the cells permits a subsequent solids digestion process to work more efficiently, while also permitting a more complete conversion to dissolved sugars, proteins and carbon dioxide.

DETAILED DESCRIPTION The present invention relates to a method for mechanically shearing and breaking apart solid particles and microbial cells, also referred to herein as particulates, in liquid waste water sludge.
By breaking the particulates into smaller-sized fragments, it is possible to break open the pores or cells within the particles, thereby freeing the water that had been absorbed into the pores of the larger-sized particles.
It is theorized that sludge particulates can be subjected to a rapid and violent rupture action that can volatilize or convert (or allow more efficient cell conversion in subsequent aerobic or anaerobic processes) biological cell material in the solid particles into dissolved sugars, proteins and carbon dioxide.
The sludge containing ruptured and fragmented solid particles can subsequently be subjected to aerobic and/or anaerobic digestion, prior to a final dewatering treatment.
The resulting reduction in the concentration of total suspended solids and biochemical oxygen demand results in less quantity which must be handled by further processing.
Thus, there is less solid material to be dewatered, less to be stored, less to be transported to disposal, and less to be disposed of in landfills, by land spreading, or by incinerating.
The destruction of cell structures and the breaking up of solid particles results in a sludge that is more easily digestible using anaerobic or aerobic digestion systems Because the particle sizes are reduced and cells are broken, thereby making available cell protoplasm or cytoplasm for further synthesis, the digestion processes work to metabolize a greater portion of the sludge than can normally be metabolized.
The destruction of particulate matter and cell structures results in a waste water sludge that is more easily dewatered using conventional dewatering equipment.
The bond between water molecules and solid particles and cells is broken by the impingement and mechanical shear, and when conditioned with conditioning chemicals, the sludge releases the water more easily, resulting in a drier sludge than is normally produced by the same dewatering equipment



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