Installation to purify and cool domestic effluent etc. - uses cooling vessel with upflow injection to avoid fouling heat transfer surface

摘要

Appts. for the purificn. and cooling of domestic effluent etc. by removal of grease, detergent scum etc. and by recuperation of heat for re-use, is described. The recuperative heat exchanger comprises cooling surfaces inside a vessel into which the effluent is injected upwards from the base. The upflow of effluent prevents the settlement of impurities as cooling proceeds. Pref. flow through the heat exchanger is controlled to produce laminar flow which entrains the impurities and carries them to an overflow discharge. This discharged effluent is pref. passed through a grease trap comprising filtration and decantation in series. Appts. is for purifying and cooling hot, domestic effluent etc., before discharging it to drainage systems. Heat is recovered for domestic use, e.g. hot water systems as the effluent is cooled. The upflow through the heat exchanger vessel prevents fouling of the heat transfer surfaces. The system is equipped with in place cleaning.