(JP9239346-A)      A process for grinding waste containing organic solids while it is suspended in a liquid, followed by removal of liquid to convert the waste into a slurry, is improved by (a) maintaining the liquid at an alkaline pH and (b) returning the removed water to the suspending liquid.    Also claimed is apparatus for such a process, comprises means of feeding the waste to a vessel (7) containing an alkaline liquid (8) and grinding mechanism (9), primary screening mechanism (12) for filtering liquid being discharged from the vessel, and secondary screening mechanism (14) to separate liquid from the slurry product (19), and line (18) to return this liquid to the vessel; means of adding aqueous alkaline solution (25) and/or particulate matter, of measuring pH (24), and of adjusting the amount of this solution or particulate matter added on the basis of measured pH, are also provided.    USE -   The waste is municipal, industrial or agricultural; slurry produced may be used as a fuel.    ADVANTAGE -   By maintaining an alkaline pH, need to shut down to remove scale deposits is reduced, putrefaction is retarded and malodour suppressed.    (US5791566-A)      A process for grinding waste containing organic solids while it is suspended in a liquid, followed by removal of liquid to convert the waste into a slurry, is improved by (a) maintaining the liquid at an alkaline pH and (b) returning the removed water to the suspending liquid.    Also claimed is apparatus for such a process, comprises means of feeding the waste to a vessel (7) containing an alkaline liquid (8) and grinding mechanism (9), primary screening mechanism (12) for filtering liquid being discharged from the vessel, and secondary screening mechanism (14) to separate liquid from the slurry product (19), and line (18) to return this liquid to the vessel; means of adding aqueous alkaline solution (25) and/or particulate matter, of measuring pH (24), and of adjusting the amount of this solution or particulate matter added on the basis of measured pH, are also provided.    USE -   The waste is municipal, industrial or agricultural; slurry produced may be used as a fuel.    ADVANTAGE -   By maintaining an alkaline pH, need to shut down to remove scale deposits is reduced, putrefaction is retarded and malodour suppressed.    (CN1165713-A)      A process for grinding waste containing organic solids while it is suspended in a liquid, followed by removal of liquid to convert the waste into a slurry, is improved by (a) maintaining the liquid at an alkaline pH and (b) returning the removed water to the suspending liquid.    Also claimed is apparatus for such a process, comprises means of feeding the waste to a vessel (7) containing an alkaline liquid (8) and grinding mechanism (9), primary screening mechanism (12) for filtering liquid being discharged from the vessel, and secondary screening mechanism (14) to separate liquid from the slurry product (19), and line (18) to return this liquid to the vessel; means of adding aqueous alkaline solution (25) and/or particulate matter, of measuring pH (24), and of adjusting the amount of this solution or particulate matter added on the basis of measured pH, are also provided.    USE -   The waste is municipal, industrial or agricultural; slurry produced may be used as a fuel.    ADVANTAGE -   By maintaining an alkaline pH, need to shut down to remove scale deposits is reduced, putrefaction is retarded and malodour suppressed.