Patent EP-2404876-A1 (EP)
Inventor: CANGA RODRIGUEZ JOSE
IPC: C02F1/44
Filed: 2011-05-06
Abstract: Device for treating an effluent (100) of a laundry comprises: a first heat exchanger (110) to cool the effluent; a bioreactor (118); a device to recirculate a variable first portion of a filtrate to reuse as washing water; a membrane filtration unit (142) to clean a variable second filtrate portion; a device to recirculate a permeate; a first heat-insulated tank to store washing water or rinsing water; a device for heating stored washing water and/or rinsing water; a device to blend the permeate with a variable third filtrate portion; a conductivity meter (184); and a foam-destruction device. Device for treating an effluent (100) of a laundry comprises: (a) a first heat exchanger (110) for cooling the effluent; (b) a bioreactor (118) for treating the effluent; (c) a device for recirculating a variable first portion of a filtrate obtained via the treatment by the bioreactor for reusing as washing water in the laundry; (d) a membrane filtration unit (142) for cleaning a variable second portion of the filtrate via reverse osmosis; (e) a device for recirculating a permeate obtained via the reverse osmosis for reusing as rinsing water in the laundry; (f) a first heat-insulated tank, in which washing water or rinsing water is stored temporarily; (g) a device through which washing water and/or rinsing water temporarily stored in the heat-insulated tank are heated by circulating through the first heat exchanger; (h) a device through which the permeate is blended with a variable third portion of the filtrate before reusing as rinsing water; (i) a conductivity meter (184), which allows the volumetric flow of the variable third portion of the filtrate to vary depending on the conductivity of rinsing water determined by the conductivity meter in such a manner that the conductivity of the rinsing water is 100-1500 mu S/cm; and (k) a foam-destruction device, which is designed in such a manner that the foam resulting in the bioreactor is controlled by spraying the effluent, a variable fourth portion of the filtrate and/or fresh water, regulating the aeration of the bioreactor, mechanically destructing by at least one mobile device, and/or spraying a defoamer. An independent claim is also included for treating the effluent of the laundry, comprising: cooling the effluent through the first heat exchanger; treating the effluent by the bioreactor; recirculating the variable first portion of the filtrate obtained by the treatment of the bioreactor for reusing as washing water in the laundry; cleaning the second variable portion of the filtrate via reverse osmosis, and recirculating the permeate obtained via the reverse osmosis for reusing as rinsing water in the laundry; temporarily storing the washing water or the rinsing water in the first insulated tank; heating the washing water and/or the rinsing water temporarily stored in the heat-insulated tank by circulating through the first heat exchanger; blending the permeate with the variable third portion of the filtrate before reusing as rinsing water; varying the volumetric flow of the variable third portion of the filtrate depending on the conductivity of rinsing water determined by the conductivity meter in such a manner that the conductivity of the rinsing water is 100-1500 mu S/cm; and controlling the foam resulting in the bioreactor by spraying the effluent, the variable fourth portion of the filtrate and/or fresh water, regulating the aeration of the bioreactor, mechanically destructing by the mobile device, and/or spraying the defoamer.