(DE4420033-C2)      Purificn. of dairy waste water involves: (a) pretreatment with a base; (b) charging the pretreated water into a fermenter, anaerobic fermentation of the lactose in the water to lactic acid and further purificn. of the fermentation broth in the fermenter; and (c) redn. of lactate in the waste water and concn. of lactic acid and base by bipolar electrodialysis.    ADVANTAGE -   The process is cheap and gives waste water with a low COD loading and lactic acid for use in the food and chemical industries and in agriculture.    (DE19580599-T)      Purificn. of dairy waste water involves: (a) pretreatment with a base; (b) charging the pretreated water into a fermenter, anaerobic fermentation of the lactose in the water to lactic acid and further purificn. of the fermentation broth in the fermenter; and (c) redn. of lactate in the waste water and concn. of lactic acid and base by bipolar electrodialysis.    ADVANTAGE -   The process is cheap and gives waste water with a low COD loading and lactic acid for use in the food and chemical industries and in agriculture.    (US5746920-A)      Purificn. of dairy waste water involves: (a) pretreatment with a base; (b) charging the pretreated water into a fermenter, anaerobic fermentation of the lactose in the water to lactic acid and further purificn. of the fermentation broth in the fermenter; and (c) redn. of lactate in the waste water and concn. of lactic acid and base by bipolar electrodialysis.    ADVANTAGE -   The process is cheap and gives waste water with a low COD loading and lactic acid for use in the food and chemical industries and in agriculture.    (EP712381-B1)      Purificn. of dairy waste water involves: (a) pretreatment with a base; (b) charging the pretreated water into a fermenter, anaerobic fermentation of the lactose in the water to lactic acid and further purificn. of the fermentation broth in the fermenter; and (c) redn. of lactate in the waste water and concn. of lactic acid and base by bipolar electrodialysis.    ADVANTAGE -   The process is cheap and gives waste water with a low COD loading and lactic acid for use in the food and chemical industries and in agriculture.    (DE19580599-C1)      Purificn. of dairy waste water involves: (a) pretreatment with a base; (b) charging the pretreated water into a fermenter, anaerobic fermentation of the lactose in the water to lactic acid and further purificn. of the fermentation broth in the fermenter; and (c) redn. of lactate in the waste water and concn. of lactic acid and base by bipolar electrodialysis.    ADVANTAGE -   The process is cheap and gives waste water with a low COD loading and lactic acid for use in the food and chemical industries and in agriculture.