Tannin modified sludge dewatering agent

Tannin modified sludge dewatering agent

[Physical and chemical properties] Plant tannins are light yellow to light brown amorphous powders or scales or spongy solids.

Plant tannins have a strong astringency and are acidic

Tannin has anionic groups, and most of the colloids in water are negatively charged.

[Preparation method] Aminated modification of tannin: Xue Xuejia and Zhou Yuming used a mixed vegetable gum based on tannin, dimethylamine, and formaldehyde for Mannich reaction to prepare a cationic flocculant

[Application] Xue Xuejia and Zhou Yuming used homemade aminated tannin flocculant to prepare a 5% solution to treat activated sludge water (add 10g kaolin and 10g activated sludge to 1000mL tap water, stir for 15min, settle for 15min, then take the upper layer Liquid); Take 100mL of the above activated sludge water, add flocculant, stir quickly for 1min, stir slowly for 15min, settle for 15min, take the supernatant and measure the light transmittance and COD