FIELD: treatment of water, industrial and household waste water or sewage sludge.
SUBSTANCE: invention can be used for purification of waste water of pulp-and-paper industry. Removal of humic substances containing lignin and other lignin-type compounds and their decomposition products from aqueous alkaline waste water from chemical pulp bleaching is carried out by deposition using high-cationic starch. High-cationic starch has charge density of at least 1.8 mEq/g of dry substance of starch derivatives, determined at pH 7–7.5, and viscosity of 20 mPa·s, measured in 3 % starch solution in water with addition of NaCl in five-fold amount relative to starch.
EFFECT: disclosed invention provides removal of humic substances from aqueous alkaline solution, and reduces amount of inorganic wastes.
11 cl, 2 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF REMOVING LIGNIN FROM WATER | 2005 |
|
RU2408543C2 |
| AQUEOUS SILICON-CONTAINING COMPOSITION AND PAPER MAKING PROCESS | 2002 |
|
RU2274692C2 |
| PAPERMAKING ADDITIVE | 1999 |
|
RU2220247C2 |
| BIOPOLYMER SIZING AGENTS | 2017 |
|
RU2741610C2 |
| METHOD OF PRODUCING GLUING ENHANCER | 2017 |
|
RU2729681C1 |
| METHOD FOR PRODUCTION OF COATED PAPER | 2005 |
|
RU2346098C1 |
| PROCESS WATER TREATMENT METHOD | 1999 |
|
RU2211190C2 |
| METHOD FOR PROCESSING STARCH IN PROCESSES FOR PRODUCING CELLULOSE, PAPER AND CARDBOARD | 2016 |
|
RU2712577C2 |
| COLLOIDAL BOROSILICATES AND THEIR EMPLOYMENT IN PAPERMAKING | 1998 |
|
RU2201396C2 |
| AQUEOUS COMPOSITION FOR MANUFACTURE OF PAPER | 2002 |
|
RU2277142C2 |
