Device and method for selective removal of inorganic compounds from a system for anaerobic waste water treatment

摘要

Device comprises: (a) an anaerobic reactor (114) for anaerobic digestion of waste water (112); (b) a three-phase separator (140) for fractionation of fermented waste water in the anaerobic reactor; (c) a crystallization reactor (158) for promoting the precipitation of inorganic substances from the separated waste water; (d) a downstream separation device (178) for separating the precipitated inorganic substances from the separated waste water; and (e) a device for recirculating at least a portion of the precipitated inorganic substances as a nucleating agent in the crystallization reactor. Device comprises: (a) an anaerobic reactor (114) for anaerobic digestion of waste water (112); (b) a three-phase separator (140) for fractionation of fermented waste water in the anaerobic reactor, where the waste water is separated by outgassing of carbon dioxide in biological sludge and separated waste water; (c) a crystallization reactor (158) for promoting the precipitation of inorganic substances from the separated waste water; (d) a downstream separation device (178) for separating the precipitated inorganic substances from the separated waste water; and (e) a device for recirculating at least a portion of the precipitated inorganic substances as a nucleating agent in the crystallization reactor and/or a device for transferring at least a portion of the precipitated inorganic substances as a nucleating agent into at least one additional crystallization reactor. An independent claim is also included for treating waste water, comprising (i) carrying out anaerobic digestion of waste water in an anaerobic reactor, (ii) fractionating the fermented waste water in the anaerobic reactor by three-phase separator, (iii) precipitating inorganic substances assisted by crystallization from the separated waste water, (iv) depositing the precipitated inorganic substances from the separated waste water in a downstream separation device, and (v) recycling at least a portion the precipitated inorganic substances as a nucleating agent in the crystallization reactor and/or conducting at least a portion of the precipitated inorganic substances as a nucleating agent into at least one additional crystallization reactor.