TECHNOLOGY FOCUS - INDUSTRIAL STANDARDS - Preferred Method: In treating aqueous organic waste or by-product streams, the bio-digester reactor is an anaerobic reactor. The step of subjecting the stream to a pervaporation separation occurs either upstream or downstream of the bio-digester reactor. The step of subjecting the stream to a pervaporation separation occurs both upstream and downstream of the bio-digester reactor to generate at least two essentially contaminant free water streams from the stream. The method comprises, prior to subjecting the stream to pervaporation separation downstream of the bio-digester reactor, subjecting the stream to a separation process to generate a primary sub-stream having a reduced dry matter content as compared to the stream and a secondary sub-stream having an increased dry matter content as compared to the stream, where the primary sub-stream is subjected to the pervaporation separation. The method also comprises processing the secondary sub-stream to remove possible contaminants and to reduce the water content, where subjecting water separated from the secondary sub-stream by the further processing to pervaporation separation to generate an essentially contaminant free water stream from it; performing pervaporation separation at a temperature of 70 degrees C; holding one or more of the output streams from the bio-digester reactor at a temperature of 70 degrees C for a period sufficient to ensure the stream or streams are aseptic; and subjecting output stream or streams and/or the essentially contaminant free water streams post pervaporation separation steps to heat exchange to reduce the temperature of those streams and to recover useful heat for re-use in the process or for use elsewhere and to manage the temperature of those streams for subsequent processing. Preferred Plant: In the process plant, the pervaporation separation unit is located either upstream or downstream of the bio-digester reactor. The process plant comprises at least two pervaporation separation units, one the unit being located upstream of the bio-digester reactor and one the unit being located downstream of the bio-digester reactor, where the bio-digester reactor is an anaerobic reactor. A bio-gas outlet of the anaerobic reactor is connected to a combined heat and power unit. Alternatively, the process plant for treating aqueous organic waste or by-product streams comprises a biodigester reactor for treating an organic waste or by-product stream comprising soluble and insoluble solids and a pervaporation separation unit comprising a membrane which permits only water vapor to be transported through it and from which an essentially contaminant free water stream and a stream containing an increased dry matter content as compared to the stream immediately prior to the pervaporation separation may be generated, the plant being capable in use of generating output streams consisting essentially of bio-gas, essentially contaminant free water and a digestate stream. The process plant is capable in use of generating output streams consisting essentially of bio-gas, aseptic essentially contaminant free water and an aseptic digestate stream. Preferred Product: Alternatively, the aseptic fertilizer product having a dry matter content of at least 20% by weight comprises a bio-digester reactor digestate and a fertilizer-enhancing additive.