NOVELTY - Treatment of an industrial sludge comprises diluting the industrial sludge to 14-15 degrees Be, adding a heavy metal ion catch precipitator, generating water-chelated salt, adding polyacrylamide flocculant, and enabling the chelated salt form flocculent deposit under the action of gravity; and removing flocculent deposit to obtain a sludge water, adding 1% potato water to the sludge water, and spurring the sludge to be fermented using the aerobic bacteria in the sludge water and the sugar in the potato water.    USE - Method for the treatment of an industrial sludge, e.g. sludge after treating waste liquid in brewery, pharmaceutical factory, feed additive factory, or in wastewater treatment plant. The industrial sludge is used for manufacturing powdery biological bacterial fertilizer used in manufacturing organic fertilizer, for transforming the saline-alkali soil, and for manufacturing granular fertilizer used for transforming the saline-alkali soil. (all claimed)    ADVANTAGE - The method is inexpensive, and does not cause secondary pollution to environment.    DETAILED DESCRIPTION - Treatment of an industrial sludge comprises:    (A) diluting the industrial sludge to 14-15 degrees Be, adding a heavy metal ion catch precipitator with 0.2/thousand of industrial sludge in the diluted industrial sludge, acting with heavy metal ion in waste liquid, generating water-chelated salt, adding polyacrylamide flocculant of 1/thousand of industrial sludge, and enabling the chelated salt form flocculent deposit under the action of gravity; and    (B) removing flocculent deposit to obtain a sludge water, adding 1% potato water to the sludge water, spurring the sludge to be fermented using the aerobic bacteria in the sludge water and the sugar in the potato water, where the fermentation during summer is carried out at 60-65 degrees C for 48 hours, the fermentation during spring and autumn is carried out at 50-55 degrees C for 60 hours, and the fermentation during winter is carried out at 40-55 degrees C for 72 hours, where the potato water is obtained by boiling 10 kg potatoes added with 100 kg water for 0.5 hours, and cooling to 5-40 degrees C, and then taking out potatoes.