2.1.2.4. Filter presses: Straw after soaking overnight in lye will be carried away by filter press presses the plunger, eliminating containing lignin.
2.1.2.5. Neutral: Straw after the filter presses will be adjusted to pH 5-6 with hydrochloric acid.
2.1.2.6. Filter presses: Finally, the last straw was pressed filter removes acid solution, the solid residue will be stored in the refrigerator (when not in use) to avoid the growth of mold.
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