Pasteurisation method and apparatus

Pasteurisation apparatus (2) comprises a first pasteurisation tank (8) and a second pasteurisation tank (9) for alternately pasteurising batches of sewage sludge. Primary and secondary heat exchangers (20) and 929) are provided in the respective first and second tanks (8) and (9) for heating and coo...

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Bibliographische Detailangaben
Hauptverfasser:	VICTORIA ANN HESLOP, ANDREW JAMES MURCOTT
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	Pasteurisation apparatus (2) comprises a first pasteurisation tank (8) and a second pasteurisation tank (9) for alternately pasteurising batches of sewage sludge. Primary and secondary heat exchangers (20) and 929) are provided in the respective first and second tanks (8) and (9) for heating and cooling the sewage in the respective tanks (8) and (9). A communicating circuit (35) for circuit (35) for circulating heat exchange water between the respective primary and secondary heat exchangers (20) and (29) transfers heat between a batch of pasteurised sewage in one of the first and second tanks (8) and (9) and a batch of sewage to be pasteurised in the other of the first and second tanks (8) and (9) to a desired feed temperature for feeding to a digester (5), and for simultaneously raising the temperature of a batch of sewage to be pasteurised in the other of the tanks (8) and (9) to an intermediate temperature prior to raising the temperature of that batch of sewage to the pasteurisation temperature.