NOVELTY - Heavy metal ion adsorbent is prepared by loading fermenter with sterilized sweet fermented rice biogas slurry culture liquid and Gluconacetobacter xylinus seed liquid with G. xylinus seed liquid inoculation amount of 8% of the total volume of sterilized sweet fermented rice biogas slurry culture liquid, adding 5-10 vol.% 1st low-methoxy pectin solution, stirring at 200 rpm, and prefermenting at 30 degrees C with pressure of 0.04 MPa and aeration rate of 0.5 L/L.minute for 6-8 days to form mature prefermented mash with small amount of flocculent cellulose.    USE - Preparation of heavy metal ion adsorbent for food and pharmaceutical industry.    ADVANTAGE - Heavy metal ion adsorbent is non-toxic and has good biological compatibility and heavy metal ion absorbing effect and simple preparation.    DETAILED DESCRIPTION - Heavy metal ion adsorbent is prepared by loading fermenter with sterilized sweet fermented rice biogas slurry culture liquid and Gluconacetobacter xylinus seed liquid with G. xylinus seed liquid inoculation amount of 8% of the total volume of sterilized sweet fermented rice biogas slurry culture liquid, adding 5-10 vol.% 1st low-methoxy pectin solution, stirring at 200 rpm, prefermenting at 30 degrees C with pressure of 0.04 MPa and aeration rate of 0.5 L/L.minute for 6-8 days to form mature prefermented mash with small amount of flocculent cellulose, sending to sterilized gas-lifting tank, adding 15-20 vol.% 2nd low-methoxy pectin solution, culturing at 30 degrees C with aeration rate of 0.3-0.5 L/L.minute for 5-7 days while introducing oxygen-enriched air with oxygen content of 50-80% to form mature fermented mash containing micelle-like modified bacterial cellulose, separating micelle-like modified bacterial cellulose from mature fermented mash, immersing in 8% ferric chloride solution for 15 minutes to crosslink, taking out micelle-like modified bacterial cellulose, washing a number of times with distilled water to remove surface impurities and residual culture medium, immersing in 0.1 mol/L sodium hydroxide (NaOH) solution in 100 degrees C water bath until translucent, repeatedly flushing with distilled water to pH of 7, blotting with gauze to remove surface moisture, drying in oven at 60 degrees C, and grinding to 40 mesh.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart for the preparation of heavy metal ion adsorbent. (Drawing includes non-English language text).