NOVELTY - Low-material consumption and less-waste water new process for extracting glutaric acid comprises (a) carrying isoelectronic crystallization on glutaric acid zymotic fluid in isoelectronic crystallizer; (b) centrifuging; (c) carrying bacterium separation; (d) dividing isoelectronic mother liquid to two portions; (e) carrying secondary crystallization; (f) separating; (g) putting the secondary crystallized glutaric acid crystal to dissolving pot, and adding dilute sulfuric acid solution; and (h) dissolving and feeding to isoelectronic crystallizer.    USE - Low-material consumption and less-waste water new process for extracting glutaric acid (claimed).    ADVANTAGE - The process can reduce the consumption of the sulfuric acid and ammonia liquid; according to the secondary crystallization, the extraction yield of glutaric acid can be improved, the crystallization quality of the glutaric acid is the best, and it does not need the "metacryst".    DETAILED DESCRIPTION - Low-material consumption and less-waste water new process for extracting glutaric acid comprises (a) carrying isoelectronic crystallization on glutaric acid zymotic fluid in isoelectronic crystallizer, adding diluted sulfuric acid solution containing glutaric acid of 2-30% and with concentration of 1-50%, adjusting the pH value of zymotic fluid to 3.0-3.2, controlling the temperature to 5-25 degrees C to separate the glutaric acid crystal out; (b) centrifuging to obtain the glutaric acid crystal and isoelectronic mother liquid; (c) carrying bacterium separation on isoelectronic mother liquid to obtain bacterium protein and isoelectronic clean mother liquid; (d) dividing isoelectronic mother liquid to two portions, evaporating one portion of 80-100% in the total quantity of the isoelectronic clean mother liquid in evaporator to obtain concentrated clean mother liquid with vacuum degree of - 0.09-0.01 Mpa and temperature in concentration of 45-98 degrees C, reserving the other one portion of 0-20% in the total quantity of isoelectronic clean mother liquid to be utilized to dissolve secondary crystallized glutaric acid; (e) carrying secondary crystallization on concentrated clean mother liquid to separate glutaric acid left in the isoelectronic mother liquid out, where pH value of secondary crystallization is 3.0-3.6, and temperature is 5-85 degrees C; (f) separating to obtain the secondary crystallized glutaric acid crystal and secondary crystallized mother liquid; (g) putting the secondary crystallized glutaric acid crystal to dissolving pot, adding water of 1-5 times of the weight of the glutaric acid crystal and/or the reserved isoelectronic clean mother liquid of 1-50 times, and adding the dilute sulfuric acid solution of 1-15 times to dissolve glutaric acid crystal, where the concentration of sulfuric acid in the solution is 1-50%; and (h) dissolving to obtain the dilute sulfuric acid solution containing glutaric acid, and then feeding to isoelectronic crystallizer, adjusting zymotic fluid of next batch to carry isoelectronic crystallization.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic diagram of the low-material consumption and less-waste water new process for extracting glutaric acid (Drawing includes non-English language texts).